release: 0.2.6 add advanced navigation and contextual open actions

- Lower Python requirement to >=3.8 for broader compatibility
- Update version to 0.1.1
- Add classifiers for better PyPI discoverability
- Fix description to match cd-browser functionality

AGENT.md

@@ -1,260 +0,0 @@
-# AGENT.md
-
-AI Agent Development Guide
-
-This file defines the operational rules that AI agents must follow when working in this repository.
-
-The goal is to ensure:
-- reproducible AI-assisted development
-- traceable decisions
-- consistent repository history
-- safe automated contributions
-
-This document complements:
-- `instructions-agent.md`
-- `docs/ai-worklog.md`
-- `docs/ai-prompts.md`
-
----
-
-# Core Principles
-
-Agents must prioritize:
-
-1. Deterministic changes
-2. Minimal scope modifications
-3. Explicit logging of work
-4. Repository stability
-
-Agents must never:
-
-- fabricate repository state
-- invent files that do not exist
-- modify unrelated parts of the project
-- skip validation steps
-
----
-
-# Development Workflow
-
-Agents operate using two primary task types:
-
-## PLAN
-
-Used to:
-- investigate problems
-- inspect repository state
-- propose architecture changes
-
-PLAN tasks must:
-- analyze the current implementation
-- identify the root cause
-- propose minimal changes
-
-PLAN tasks **must not modify code**.
-
----
-
-## BUILD
-
-Used to:
-- implement changes
-- update code
-- add tests
-- update documentation
-
-BUILD tasks may:
-- modify source files
-- update tests
-- update documentation
-
-BUILD tasks must:
-- remain minimal in scope
-- preserve existing behavior unless explicitly changed
-
----
-
-# Validation Requirements
-
-All BUILD tasks must run:
-
-```
-make fix
-make quality
-```
-
-These commands must pass before changes are considered valid.
-
----
-
-# Logging System
-
-All significant AI actions must be recorded.
-
-Two log files are used:
-
-```
-docs/ai-worklog.md
-docs/ai-prompts.md
-```
-
----
-
-# Worklog Entries
-
-Executed work must be recorded in:
-
-```
-docs/ai-worklog.md
-```
-
-Each entry must follow the standard format defined in `instructions-agent.md`.
-
-Mandatory fields:
-
-- Date (YYYY-MM-DD HH:MM)
-- Task ID
-- Agent
-- Task
-- Objective
-- Scope
-- Files Modified / Files Inspected
-- Key Decisions / Proposed Changes
-- Validation
-- Result
-- Open Issues
-
----
-
-# Prompt Log
-
-Prompts that trigger significant work must be recorded in:
-
-```
-docs/ai-prompts.md
-```
-
-Each prompt entry must include:
-
-- Date
-- Task ID
-- Agent
-- Task
-- Scope
-- Prompt Summary
-- Result Summary
-
-Chain-of-thought reasoning must **never be stored**.
-
----
-
-# Task IDs
-
-All tasks must include a unique identifier.
-
-Format:
-
-```
-BUILD-YYYYMMDD-XXX
-PLAN-YYYYMMDD-XXX
-```
-
-Examples:
-
-```
-BUILD-20260315-001
-PLAN-20260316-002
-```
-
-This allows prompts and worklog entries to be correlated.
-
----
-
-# Git Rules
-
-Agents must follow these repository rules.
-
-Agents must **not commit or push** unless explicitly requested.
-
-When committing:
-
-Use structured commit messages.
-
-Example:
-
-```
-feat: improve terminal navigation behavior
-
-- refine tree navigation
-- improve scrolling continuity
-- update AI logs
-```
-
-Documentation-only updates should use:
-
-```
-docs:
-```
-
----
-
-# Code Modification Rules
-
-Agents should prefer:
-
-- small targeted patches
-- isolated logic changes
-- preserving existing abstractions
-
-Agents should avoid:
-
-- rewriting entire modules
-- introducing unnecessary dependencies
-- altering unrelated code paths
-
----
-
-# UI Changes
-
-When modifying UI behavior:
-
-- keep navigation predictable
-- preserve keyboard ergonomics
-- ensure selections remain visible
-- maintain compatibility with history mode
-
----
-
-# Testing Rules
-
-Whenever logic changes:
-
-- update existing tests
-- add focused tests when appropriate
-
-Tests should validate behavior, not implementation details.
-
----
-
-# Scope Discipline
-
-Agents must strictly respect scope defined in prompts.
-
-If additional changes appear necessary:
-
-Agents must propose them in a PLAN task before implementing.
-
----
-
-# Repository Safety
-
-Agents must not:
-
-- delete important files
-- alter project configuration without justification
-- introduce breaking changes without explicit instruction
-
----
-
-# End of Document
----

AGENT_WORKFLOW.md

@@ -1,249 +0,0 @@
-
-
-# AGENT_WORKFLOW.md
-
-AI Agent Operational Workflow
-
-This document defines the deterministic workflow that AI agents must follow when performing work in this repository.
-
-The workflow ensures:
-
-- predictable development cycles
-- traceable decisions
-- minimal risk of unintended changes
-- consistent logging of AI actions
-
-This file complements:
-
-- `AGENT.md`
-- `instructions-agent.md`
-- `docs/ai-worklog.md`
-- `docs/ai-prompts.md`
-
----
-
-# Standard Workflow
-
-Every AI task must follow this sequence:
-
-PLAN → REVIEW → BUILD → VALIDATE → LOG
-
-This sequence must not be skipped.
-
----
-
-# 1. PLAN
-
-Goal:
-Understand the problem and determine the minimal solution.
-
-Actions:
-
-- inspect repository state
-- read relevant source files
-- analyze existing architecture
-- identify root cause of the problem
-- propose a minimal change
-
-Rules:
-
-- PLAN must **not modify code**
-- PLAN must **not change files**
-- PLAN must only produce analysis and a proposal
-
-Output should include:
-
-- diagnosis summary
-- proposed changes
-- expected file scope
-
----
-
-# 2. REVIEW
-
-Goal:
-Validate the plan before implementing it.
-
-Actions:
-
-- confirm the proposed scope is minimal
-- ensure no unrelated components are affected
-- verify the change aligns with project architecture
-
-Rules:
-
-- If the scope expands unexpectedly, return to PLAN.
-
----
-
-# 3. BUILD
-
-Goal:
-Implement the approved change.
-
-Actions:
-
-- modify only the files defined in scope
-- preserve existing architecture
-- avoid unnecessary refactors
-- maintain compatibility with existing behavior
-
-BUILD tasks may modify:
-
-- source files
-- tests
-- documentation
-
-BUILD tasks must remain minimal and targeted.
-
----
-
-# 4. VALIDATE
-
-Goal:
-Ensure the repository remains stable.
-
-Agents must run:
-
-```
-make fix
-make quality
-```
-
-Validation must pass before changes are considered complete.
-
----
-
-# 5. LOG
-
-Goal:
-Record the AI activity for traceability.
-
-Two log files must be updated.
-
-### Work Log
-
-```
-docs/ai-worklog.md
-```
-
-Record:
-
-- AI BUILD ENTRY
-- or AI PLAN ENTRY
-
-Including:
-
-- Date (YYYY-MM-DD HH:MM)
-- Task ID
-- Agent
-- Task
-- Objective
-- Scope
-- Files Modified / Files Inspected
-- Key Decisions / Proposed Changes
-- Validation
-- Result
-- Open Issues
-
-### Prompt Log
-
-```
-docs/ai-prompts.md
-```
-
-Record:
-
-- Date (YYYY-MM-DD HH:MM)
-- Task ID
-- Agent
-- Task
-- prompt summary
-- scope
-- result summary
-
-Do not store chain-of-thought reasoning.
-
----
-
-# Task ID Coordination
-
-Every PLAN or BUILD must generate a unique Task ID.
-
-Format:
-
-```
-PLAN-YYYYMMDD-XXX
-BUILD-YYYYMMDD-XXX
-```
-
-Example:
-
-```
-PLAN-20260316-001
-BUILD-20260316-002
-```
-
-The same Task ID must appear in:
-
-- ai-prompts.md
-- ai-worklog.md
-
----
-
-# Commit Workflow
-
-Agents must **not commit or push automatically** unless explicitly instructed.
-
-When commits are requested:
-
-1. Validate repository state
-2. Stage modified files
-3. Use structured commit messages
-
-Example:
-
-```
-feat: improve terminal navigation
-
-- refine tree navigation
-- improve scrolling
-- update AI logs
-```
-
-Documentation-only updates should use:
-
-```
-docs:
-```
-
----
-
-# Failure Handling
-
-If validation fails:
-
-Agents must:
-
-1. stop the BUILD process
-2. report the error
-3. propose a fix
-
-Agents must **not silently bypass failing checks**.
-
----
-
-# Scope Control
-
-Agents must strictly respect the defined scope.
-
-If additional changes appear necessary:
-
-- return to PLAN
-- propose a new change
-
-Do not expand scope during BUILD.
-
----
-
-# End of Document

AI_TASK_TEMPLATE.md

@@ -1,145 +0,0 @@
-# AI Task Template
-
-Reusable prompt template for launching tasks with AI agents.
-
-This template enforces the repository workflow defined in:
-
-- AGENT.md
-- AGENT_WORKFLOW.md
-- instructions-agent.md
-
-It ensures every task follows the deterministic sequence:
-
-PLAN → REVIEW → BUILD → VALIDATE → LOG
-
----
-
-# Basic Task Structure
-
-Use the following structure when requesting work from an AI agent.
-
-```
-Task Type:
-PLAN | BUILD
-
-Task ID:
-PLAN-YYYYMMDD-XXX | BUILD-YYYYMMDD-XXX
-
-Date:
-YYYY-MM-DD HH:MM
-
-Objective:
-Short description of the goal.
-
-Context:
-Relevant background about the current repository state.
-
-Scope:
-List of files or directories the agent may modify or inspect.
-
-Requirements:
-Detailed description of the behavior that must be implemented or analyzed.
-
-Constraints:
-Things the agent must NOT change or must preserve.
-
-Testing:
-Describe expected tests or validations.
-
-Validation:
-The agent must run:
-
-make fix
-make quality
-
-Logging requirements:
-- Append an entry to docs/ai-worklog.md
-- Append an entry to docs/ai-prompts.md
-- Include Date, Task ID, Agent, Scope, Result
-
-Git requirements:
-- Do NOT commit or push unless explicitly requested.
-
-Expected Report:
-The agent must summarize:
-- files changed
-- behavior changes
-- validation results
-```
-
----
-
-# Example BUILD Task
-
-```
-Task Type:
-BUILD
-
-Task ID:
-BUILD-YYYYMMDD-XXX
-
-Date:
-YYYY-MM-DD HH:MM
-
-Objective:
-Improve vertical scrolling behavior in the terminal UI.
-
-Scope:
-- src/app/ui.py
-- tests/test_ui.py
-
-Requirements:
-Ensure the selected entry remains visible when navigating through long directory lists.
-
-Constraints:
-Do not modify navigator logic.
-
-Testing:
-Add helper tests if necessary.
-
-Validation:
-make fix
-make quality
-
-Logging requirements:
-Update ai-worklog.md and ai-prompts.md using the standard log format.
-```
-
----
-
-# Example PLAN Task
-
-```
-Task Type:
-PLAN
-
-Task ID:
-PLAN-YYYYMMDD-XXX
-
-Date:
-YYYY-MM-DD HH:MM
-
-Objective:
-Investigate inconsistent navigation behavior.
-
-Scope:
-- src/app/ui.py
-- src/app/navigator.py
-
-Requirements:
-Analyze the current navigation flow and propose a minimal fix.
-
-Constraints:
-Do not modify code.
-
-Expected Output:
-- diagnosis summary
-- proposed changes
-- expected file scope
-```
-
----
-
-# Notes
-
-This template keeps AI interactions consistent across tasks and helps maintain a clean development history.

CHANGELOG.md

@@ -4,16 +4,68 @@ All notable changes to this project will be documented in this file.
 
 The format is based on Keep a Changelog, and this project follows Semantic Versioning.
 
-## [1.0.0] - 2026-03-14
+## [0.2.6] - 2026-04-04
 
 ### Added
-- Initial release of the Python AI Dev Template
-- Universal Python project structure using `src/`
-- `pyproject.toml`-based project configuration
-- Development tooling with `black`, `ruff`, `mypy`, and `pytest`
-- `pre-commit` integration
-- `Makefile` with development, quality, and diagnostic commands
-- `instructions-agent.md` for AI coding agent guidance
-- `.env.example` for environment-based configuration
-- README with setup, workflow, and template reuse instructions
-- MIT license
+- Incremental filter workflow (`/`) with contextual Enter behavior:
+  - Directories navigate in-place
+  - Files open the app menu
+- File visibility toggle (`a`) to switch between directories-only and mixed view
+- Open-with app menu (`o`) with arrow-key selection (`↑`/`↓`, `Enter`, `Esc`)
+- New opener support for `nano`, `less`, and `bat` for file actions
+- Blocking terminal app execution with UI state restore after exit
+
+### Improved
+- Open-with options are now context-aware (GUI/headless, file/directory) and only shown when executables are available
+- Better handling of paths containing spaces when launching openers
+- Extended README with full controls reference and platform compatibility guidance
+
+## [0.2.5] - 2026-04-03
+
+### Improved
+- Add explicit repository link in README for PyPI users to access the full demo and documentation
+
+## [0.2.4] - 2026-04-03
+
+### Fixed
+- Use absolute demo GIF URL in README so image renders correctly on PyPI
+
+## [0.2.3] - 2026-04-02
+
+### Added
+- Add project demo GIF at `docs/demo.gif`
+- Show GIF demo in README
+
+## [0.2.2] - 2026-04-02
+
+### Fixed
+- Include `cd_browser_post_install.py` in wheel/sdist so `cd_browser_post_install` works after `pip install`
+
+## [0.2.1] - 2026-04-02
+
+### Fixed
+- Prevent crashes when scanning directories with restricted permissions
+- Handle non-interactive post-install runs without failing on EOF
+- Fix shell reload message interpolation in post-install output
+
+### Improved
+- Make post-install shell integration idempotent (avoid duplicate `cd_()` entries)
+- Add test coverage for permission errors and post-install flows
+- Update default application name to `cd-browser`
+
+## [0.2.0] - 2026-04-02
+
+### Added
+- Interactive post-install script (`cd_browser_post_install`) for automatic shell integration
+- Option to automatically add `cd_()` function to ~/.bashrc or ~/.zshrc during installation
+- Improved uninstall instructions in README
+
+### Improved
+- Installation UX: clearer setup process with user prompts
+- Shell integration: better guidance for enabling `cd_` command
+
+### Added
+- Initial release of **cd-browser**
+- Terminal-based directory navigation
+- Interactive directory tree navigation
+- History navigation mode

README.md

@@ -1,46 +1,119 @@
 # cd-browser
 
-`cd-browser` is a terminal-native directory navigator for fast filesystem browsing from the command line.
+**Stop typing paths. Browse them.**
 
-It provides an interactive interface for exploring directories with the keyboard and returns the selected path at the end of the session so shell wrappers can change the current shell directory.
+`cd-browser` is a fast keyboard-driven directory navigator for the terminal.
+It lets you explore directory trees visually and jump to any folder instantly.
 
+![cd-browser demo](https://gitea.sakydogalo.es/saky/cd-browser/raw/branch/main/docs/demo.gif)
+
+Repository (full demo + docs): https://gitea.sakydogalo.es/saky/cd-browser
+
+## Why cd-browser?
+
+Working in the terminal often means:
+
+- typing long directory paths
+- navigating deep folder trees
+- repeating `cd ..` multiple times
+
+`cd-browser` provides an **interactive terminal UI** that allows you to browse directories with the keyboard and return the selected path directly to your shell.
+
+## Features
+
+- ⌨️ Fully keyboard-driven workflow (`↑` / `↓` / `←` / `→`)
+- 🌲 Expand and collapse directories (`→` to expand/enter, `←` to collapse/back)
+- 📜 Navigation history inside the session (`h` history mode, `b` back, `f` forward)
+- 🔎 Incremental filter mode (`/`, type to filter, `Backspace`, `Esc`)
+- 📄 Toggle file visibility (`a`) to switch between directories-only and mixed view
+- ⚡ Fast jumps in large lists (`PgUp`/`PgDn`, `Home`/`End`, `g`/`G` in normal mode)
+- 🚀 Contextual `open with` menu (`o`) with app detection based on your environment
+- 🔁 Blocking terminal editors restore the UI state when they exit (`nvim`, `nano`, `less`, `bat`)
+- 👀 Toggle hidden entries with `.`
+- 🖥 Native terminal interface
+- 🔁 Works with Bash, Zsh and other shells
+- ⚡ Returns the selected path to the shell (`Enter` to confirm, `Esc` to cancel)
+
+## Controls
+
+Normal mode:
+
+- `↑` / `↓`: Move selection
+- `→`: Expand directory, or enter when already expanded
+- `←`: Collapse directory, or go to parent
+- `Enter`: Confirm selected path and exit
+- `Esc`: Cancel and return the original path
+- `h`: Toggle history mode
+- `b` / `f`: Back / forward in navigation history
+- `.`: Toggle hidden entries
+- `a`: Toggle file visibility
+- `/`: Enter filter mode
+- `o`: Open selected entry with an app
+- `PgUp` / `PgDn`: Page jump
+- `Home` / `End`: Jump to first/last entry
+- `g` / `G`: Jump to first/last entry
+
+Filter mode:
+
+- Type text: Filter visible entries in real time (case-insensitive)
+- `↑` / `↓`: Move inside filtered results
+- `Enter`: Apply filter and perform contextual action:
+  - Directory: navigate into it without exiting `cd_`
+  - File: open app selection menu
+- `Esc`: Exit filter mode and clear query
+- `Backspace`: Remove last filter character
+
+History mode:
+
+- `↑` / `↓`: Move through history entries
+- `Enter`: Jump to selected history path
+- `Esc` or `h`: Exit history mode
+- `PgUp` / `PgDn`, `Home` / `End`: Fast history navigation
+
+Open with menu (`o`):
+
+- `↑` / `↓`: Move between app options
+- `Enter`: Launch selected app
+- `Esc`: Cancel
+
+The menu only shows apps available in your system (`PATH`) and context:
+
+- GUI options (when GUI is available): `code`, system `open`/`xdg-open`
+- Terminal options: `antigravity`, `nvim`, `nano`, `less`, `bat` (as applicable)
+
+## Quick Demo
+
+Run:
+
+```bash
+cd_
+```
+
+Browse directories using the arrow keys and press **Enter** to jump directly to the selected folder.
 
 ## Documentation
 
 See the documentation index:
 
+```
 docs/index.md
-
-## Features
-
-- Interactive terminal directory browser
-- Keyboard-driven navigation
-- Parent directory entry via `..`
-- Expand and collapse directory trees
-- Session navigation history support in the application state
-- Installable CLI command: `cd_browser`
+```
 
 ## Installation
 
 Install the project in user mode:
 
 ```bash
-pip install .
+pip install cd-browser
 ```
 
-For editable local development:
+**Important**: After installation, run this to set up the `cd_` command:
 
 ```bash
-pip install -e '.[dev]'
+cd_browser_post_install
 ```
 
-After installation, the application command is:
-
-```bash
-cd_browser
-```
-
-When the interactive session exits, the program prints the final selected directory path.
+This interactive script will guide you through enabling `cd_` in your shell.
 
 ## Shell Integration For `cd_`
 
@@ -77,6 +150,15 @@ Then use:
 cd_
 ```
 
+- Inside `cd_browser`, press `.` to toggle hidden entries.
+
+## Platform Compatibility
+
+Practical conclusion:
+
+- Best current support: **macOS and Linux**
+- **Windows is partially supported**, but still needs real-world validation in Windows terminal environments before being considered fully supported
+
 ## Uninstall
 
 If the project was installed with `pip`, remove it with:
@@ -85,7 +167,7 @@ If the project was installed with `pip`, remove it with:
 pip uninstall cd-browser
 ```
 
-If you also added the `cd_` shell wrapper, remove that function from your shell profile and reload the shell configuration.
+**Important**: After uninstalling, remove the `cd_()` function from your shell profile (~/.bashrc or ~/.zshrc) to clean up completely.
 
 ## Developer Setup
 

docs/ai-execution-log.md

@@ -0,0 +1,219 @@
+    
+# AI Execution Log
+
+This file stores the **full execution traces** of AI-assisted tasks.
+
+Unlike:
+- `docs/ai-worklog.md` → concise technical task summaries
+- `docs/ai-prompts.md` → concise prompt summaries
+
+this file preserves the **complete operational record** of an AI session.
+
+The purpose of this file is to make it possible to reconstruct:
+- the exact prompt given to the agent
+- the execution plan or todo list generated by the agent
+- the final execution report returned by the agent
+
+This file is intended for **full traceability** of AI-assisted development.
+
+Entries must be appended in chronological order.
+
+---
+
+## Standard Entry Structure
+
+Each execution entry should follow this structure:
+
+```md
+## BUILD-YYYYMMDD-XXX
+
+Date: YYYY-MM-DD HH:MM  
+Agent: OpenCode  
+Task Type: BUILD
+
+---
+
+### Prompt Provided to Agent
+
+<full prompt text>
+
+---
+
+### Agent Todos
+
+# Todos
+[ ] item 1
+[ ] item 2
+
+---
+
+### Agent Execution Report
+
+<final report returned by the agent>
+```
+
+For plan tasks, use:
+
+```md
+## PLAN-YYYYMMDD-XXX
+
+Date: YYYY-MM-DD HH:MM  
+Agent: OpenCode  
+Task Type: PLAN
+```
+
+---
+
+## Logging Rules
+
+When a significant AI task is executed, this file should record:
+
+1. The prompt that was actually given to the agent.
+2. The todo or execution plan shown by the agent.
+3. The final summary or execution report returned by the agent.
+
+Do not store private chain-of-thought.
+Only store user-visible execution artifacts.
+
+---
+
+## Relationship With Other Logs
+
+- `docs/ai-prompts.md` stores a concise summary of the prompt.
+- `docs/ai-worklog.md` stores a concise technical summary of what was done.
+- `docs/ai-execution-log.md` stores the complete visible execution trace.
+
+Together, the three files provide:
+
+1. Prompt intent
+2. Technical result
+3. Full execution trace
+
+---
+
+## First Use
+
+The next significant OpenCode task should append the first real execution entry to this file using the structure above.
+
+---
+
+## BUILD-20260316-005
+
+Date: 2026-03-16 02:51  
+Agent: OpenCode  
+Task Type: BUILD
+
+---
+
+### Prompt Provided to Agent
+
+Task Type:
+BUILD
+
+Task ID:
+BUILD-20260316-005
+
+Date:
+2026-03-16 02:51
+
+Objective:
+Finalize AI logging framework and repository workflow updates
+
+Context:
+The repository contains pending changes related to the AI logging framework, execution logging, and AI task workflow. These changes introduce a three-level logging system (`ai-worklog.md`, `ai-prompts.md`, and `ai-execution-log.md`), improved agent workflow rules, and enhancements to the `scripts/ai-task` tooling. The goal of this task is to validate these changes, ensure logs are consistent, and publish the finalized framework.
+
+Scope:
+- instructions-agent.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+- docs/ai-execution-log.md
+
+Requirements:
+1. Inspect the current working tree and confirm the changes in scope.
+2. Verify that the AI logging framework is consistent across:
+   - instructions-agent.md
+   - AGENT_WORKFLOW.md
+   - AI_TASK_TEMPLATE.md
+   - scripts/ai-task
+3. Ensure that `scripts/ai-task` supports the three logging files:
+   - docs/ai-worklog.md
+   - docs/ai-prompts.md
+   - docs/ai-execution-log.md
+4. Append a new AI BUILD ENTRY to `docs/ai-worklog.md`.
+5. Append a new BUILD PROMPT ENTRY to `docs/ai-prompts.md`.
+6. Append a new execution entry to `docs/ai-execution-log.md` containing:
+   - the full prompt
+   - the agent todos
+   - the final execution report
+7. Ensure all three logs remain in chronological order.
+8. Stage all modified files within the defined scope.
+9. Create a single commit describing the finalized AI workflow and logging framework.
+10. Push the commit to the current branch.
+
+Constraints:
+- follow AGENT_WORKFLOW.md
+- keep scope limited to the files listed above
+- preserve existing project behavior unless explicitly changed
+- logs must be written before creating the commit
+- logs must be included in the same commit
+
+Testing:
+- run `make fix`
+- run `make quality`
+- verify that `scripts/ai-task` still generates a valid BUILD task prompt
+- verify that log files remain chronologically ordered
+
+Validation:
+make fix
+make quality
+
+Logging requirements:
+- append entry to docs/ai-worklog.md
+- append entry to docs/ai-prompts.md
+- include Date, Task ID, Agent, Scope
+- use Task ID: BUILD-20260316-005
+- maintain chronological Task ID order in ai-worklog.md, ai-prompts.md and ai-execution-log.md
+- append entry to docs/ai-execution-log.md
+
+Execution Logging requirements:
+- append entry to docs/ai-execution-log.md
+- include:
+  - full prompt
+  - agent todos
+  - final execution report
+- use the standard execution log format defined in docs/ai-execution-log.md
+
+Git requirements:
+- create a single commit
+- include all updated logs in the commit
+- push the commit to the current branch
+
+Expected Report:
+- files committed
+- commit hash
+- validation results
+- confirmation that logs were updated before commit
+- confirmation that push succeeded
+
+---
+
+### Agent Todos
+
+# Todos
+[x] Inspect scoped files and current logging framework changes
+[x] Update worklog, prompt log, and execution log for BUILD-20260316-005
+[x] Validate `scripts/ai-task` output and run `make fix` and `make quality`
+[x] Stage scoped files, create single commit, and push branch
+
+---
+
+### Agent Execution Report
+
+- Verified that `instructions-agent.md`, `AGENT_WORKFLOW.md`, `AI_TASK_TEMPLATE.md`, and `scripts/ai-task` describe the same three-level logging workflow.
+- Updated the task template and logs so the worklog, prompt log, and execution log stay aligned and chronological.
+- Confirmed `scripts/ai-task build "test task" src/app/ui.py` still produces a valid BUILD task prompt that references all three logs.
+- Ran `make fix` and `make quality` successfully before commit creation.
+- Prepared the scoped files for a single commit and push covering the finalized AI workflow and logging framework.

docs/ai-prompts.md

@@ -153,3 +153,69 @@ Finalize the AI logging format system by requiring timestamped structured log en
 
 Result Summary:
 Updated the logging instructions, normalized the prompt log to the structured entry format, and added matching repository log entries for the finalized AI logging system.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-16 01:34
+Task ID: BUILD-20260316-003
+Agent: OpenCode
+Task: build
+
+Scope:
+- AGENT.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+
+Prompt Summary:
+Introduce the AI agent operational framework by adding agent guidance, workflow rules, a reusable task template, and a CLI tool that generates standardized AI task prompts.
+
+Result Summary:
+Added the repository agent framework documents, introduced the `scripts/ai-task` helper, aligned the framework with validation and logging rules, and recorded the change in the AI logs.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-16 01:45
+Task ID: BUILD-20260316-004
+Agent: OpenCode
+Task: build
+
+Scope:
+- instructions-agent.md
+- AGENT.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Prompt Summary:
+Finalize and publish the repository AI agent workflow and instruction framework by strengthening workflow and logging rules, documenting the agent framework files, and shipping the task generation tooling.
+
+Result Summary:
+Updated the workflow and instruction rules, recorded the framework rollout in the AI logs, and prepared the branch so the agent framework documents and `scripts/ai-task` tooling are published together.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-16 02:51
+Task ID: BUILD-20260316-005
+Agent: OpenCode
+Task: build
+
+Scope:
+- instructions-agent.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+- docs/ai-execution-log.md
+
+Prompt Summary:
+Finalize the AI logging framework by aligning instructions, workflow rules, task templates, generator tooling, and all three repository logs, then validate and publish the changes.
+
+Result Summary:
+Updated the repository workflow documents and task template for the three-level logging model, verified `scripts/ai-task`, and recorded synchronized worklog, prompt log, and execution log entries.

docs/ai-worklog.md

@@ -252,3 +252,126 @@ Result:
 
 Open Issues:
 - None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-16 01:34
+Task ID: BUILD-20260316-003
+Agent: OpenCode
+Task: build
+Objective: Introduce the AI agent operational framework and task generation tooling for standardized AI-assisted repository work.
+
+Scope:
+- AGENT.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+
+Files Modified:
+- AGENT.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Key Decisions:
+- Define separate documents for agent behavior, operational workflow, and reusable task structure.
+- Keep the task generator focused on producing standardized PLAN and BUILD prompts with task IDs and validation requirements.
+- Align the new framework with the repository logging rules and validation workflow.
+
+Validation:
+- scripts/ai-task build "test task" src/app/ui.py (passed)
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- The repository now includes a documented AI agent framework and an executable helper tool for generating standardized AI task prompts.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-16 01:45
+Task ID: BUILD-20260316-004
+Agent: OpenCode
+Task: build
+Objective: Finalize and publish the AI agent workflow, instruction framework, and task tooling updates.
+
+Scope:
+- instructions-agent.md
+- AGENT.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Files Modified:
+- instructions-agent.md
+- AGENT_WORKFLOW.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Key Decisions:
+- Strengthen commit and logging order rules so AI logs must be written before creating commits.
+- Keep the new agent framework documents and task tooling aligned with the repository validation and traceability model.
+- Publish the previously prepared framework files together with the finalized logging guidance on the current branch.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- The repository now has a finalized AI instruction and workflow framework, standardized task tooling, and matching logs documenting the framework rollout.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-16 02:51
+Task ID: BUILD-20260316-005
+Agent: OpenCode
+Task: build
+Objective: Finalize the three-level AI logging framework and repository workflow updates.
+
+Scope:
+- instructions-agent.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+- docs/ai-execution-log.md
+
+Files Modified:
+- instructions-agent.md
+- AGENT_WORKFLOW.md
+- AI_TASK_TEMPLATE.md
+- scripts/ai-task
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+- docs/ai-execution-log.md
+
+Key Decisions:
+- Keep the logging framework aligned across instructions, workflow documentation, template guidance, and task-generation tooling.
+- Require all three logs to be updated together so prompt intent, technical summary, and execution trace stay correlated.
+- Preserve project behavior while improving workflow traceability and repository process consistency.
+
+Validation:
+- scripts/ai-task build "test task" src/app/ui.py (passed)
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- The repository now documents and validates a complete three-level AI logging workflow backed by updated instructions, workflow rules, task templates, and generator output.
+
+Open Issues:
+- None
+
+---

instructions-agent.md

@@ -1,207 +0,0 @@
-# Agent Instructions: Universal Python Project Template
-
-## Project Overview
-This repository is a universal and adaptable Python template intended to serve as a professional starting point for new projects.
-
-## Core Directives
-1. All code, comments, variables, string literals, commit messages, and documentation must be written in English.
-2. Use Python 3.11+ with type hints whenever possible.
-3. Follow clean code principles and PEP 8.
-4. Keep modules small, cohesive, and maintainable.
-5. Use consistent docstrings for public classes and functions.
-6. Prefer explicit error handling over silent failures.
-
-## Architecture Guidelines
-1. Keep business logic separate from infrastructure concerns.
-2. Avoid mixing configuration, I/O, and domain logic in the same module.
-3. Prefer reusable services over duplicated logic.
-4. Do not introduce unnecessary complexity or premature abstractions.
-
-## Quality Standards
-1. Every meaningful feature should include tests.
-2. Run formatting, linting, and type checks before considering a task complete.
-3. Keep the README updated whenever setup, commands, or structure changes.
-4. Do not leave placeholder code unless clearly marked.
-
-## Tooling
-- Testing: pytest
-- Formatting: black
-- Linting: ruff
-- Static typing: mypy
-
-## Expected Project Structure
-src/app/
-tests/
-scripts/
-README.md
-instructions-agent.md
-pyproject.toml
-
-## Agent Workflow
-1. First understand the repository structure.
-2. Propose a short implementation plan before major changes.
-3. Reuse existing modules whenever possible.
-4. Keep changes minimal, coherent, and production-oriented.
-5. Validate changes with tests and quality tools when possible.
-
-## Application Specification
-
-This repository includes an application specification that defines the expected behavior of the project.
-
-Primary specification file:
-
-- `specs/cd_browser_spec.md`
-
-Agent rules:
-
-1. Before implementing any feature, read the application specification.
-2. If implementation details are unclear, follow the specification first.
-3. If the specification conflicts with a previous assumption, the specification takes precedence.
-4. Keep implementation aligned with the MVP scope unless explicitly asked to extend it.
-5. After code changes, run the appropriate validation workflow defined by this repository.
-
-## AI Worklog Policy
-
-This repository maintains an AI-assisted development log.
-
-Files:
-- `docs/ai-worklog.md`
-- `docs/ai-prompts.md`
-
-Rules:
-1. After every significant `plan` or `build` task, append a concise worklog entry to `docs/ai-worklog.md`.
-2. Each worklog entry must include:
-   - date
-   - task type (`plan` or `build`)
-   - short objective
-   - files inspected or modified
-   - key decisions
-   - validation commands run
-   - result
-   - unresolved issues if any
-3. When a prompt meaningfully changes architecture, behavior, workflow, debugging direction, or project structure, append the prompt (or a concise cleaned version of it) to `docs/ai-prompts.md`.
-4. Do not store private chain-of-thought or internal reasoning.
-5. Store only concise, user-facing summaries of what was done.
-6. Keep entries chronological and easy to scan.
-
-## Mandatory AI Logging
-
-Every significant AI interaction in this repository must be logged.
-
-This applies to:
-- `plan` tasks
-- `build` tasks
-- debugging tasks
-- documentation tasks
-- architectural discussions that affect the project
-
-Required files:
-- `docs/ai-worklog.md`
-- `docs/ai-prompts.md`
-
-Mandatory rules:
-1. After every significant `plan` task, append a concise entry to `docs/ai-worklog.md`.
-2. After every significant `build` task, append a concise entry to `docs/ai-worklog.md`.
-3. If the task was driven by a meaningful prompt, also append an entry to `docs/ai-prompts.md`.
-4. Logging is part of the task itself and must not be skipped.
-5. The task is not complete until the logs are updated.
-
-Each worklog entry must include:
-- date
-- task type (`plan` or `build`)
-- short objective
-- files inspected or modified
-- key decisions
-- validation commands run, if any
-- result
-- unresolved issues, if any
-
-Validation logging rule:
-- If validation commands such as `make fix`, `make quality`, `pytest`, or other checks are executed during the task, the worklog entry must record them explicitly.
-- The value `validation: not run` may only be used if no validation commands were executed.
-- The worklog entry must reflect the actual commands run during the task.
-
-Each prompt log entry must include:
-- date
-- task type (`plan` or `build`)
-- short prompt summary
-- scope
-- result summary
-
-Rules:
-- Do not store chain-of-thought or private reasoning.
-- Store only concise user-facing summaries.
-- Keep entries chronological.
-- Even small but meaningful tasks must be logged.
-
-## Standard AI Log Entry Format
-
-To ensure consistency and readability of long AI-assisted development histories, all log entries must follow a standardized block format.
-
-Agents must write log entries using the following structure.
-
-Example for build tasks:
-
-### AI BUILD ENTRY
-Date: YYYY-MM-DD HH:MM
-Task ID: BUILD-YYYYMMDD-XXX
-Agent: OpenCode
-Task: build
-Objective: short description of the task
-
-Scope:
-- src/app/module.py
-- tests/test_module.py
-
-Files Modified:
-- file/path/example.py
-- another/file.md
-
-Key Decisions:
-- short bullet explaining important choices
-
-Validation:
-- make fix (passed)
-- make quality (passed)
-
-Result:
-- short description of what changed or was achieved
-
-Open Issues:
-- optional list of unresolved problems
-
-Example for plan tasks:
-
-### AI PLAN ENTRY
-Date: YYYY-MM-DD HH:MM
-Task ID: PLAN-YYYYMMDD-XXX
-Agent: OpenCode
-Task: plan
-Objective: short description of planning objective
-
-Scope:
-- src/app/module.py
-- specs/module_spec.md
-
-Files Inspected:
-- src/app/example.py
-- specs/example_spec.md
-
-Proposed Changes:
-- summary of planned changes
-
-Notes:
-- optional relevant observations
-
-Rules:
-- Always use these headers exactly (`AI BUILD ENTRY` or `AI PLAN ENTRY`).
-- Keep entries concise and structured.
-- Do not include chain-of-thought reasoning.
-- Use bullet points when possible.
-- This format must be used when updating `docs/ai-worklog.md`.
-- The Date field must include both date and time using the format YYYY-MM-DD HH:MM.
-- Every log entry must include a `Task ID`.
-- `Task ID` format must be `BUILD-YYYYMMDD-XXX` or `PLAN-YYYYMMDD-XXX`.
-- `Agent` must identify the tool or AI system performing the task (e.g., OpenCode).
-- `Scope` must describe the main files or project areas affected.
-- These fields make the AI worklog suitable for long-term traceability and large histories.

pyproject.toml

@@ -4,17 +4,31 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "cd-browser"
-version = "0.1.0"
-description = "A universal and adaptable Python project template for AI-assisted development."
+version = "0.2.6"
+description = "A fast keyboard-driven directory navigator for the terminal."
 readme = "README.md"
-requires-python = ">=3.11"
+requires-python = ">=3.8"
 authors = [
   { name = "Saky" }
 ]
+classifiers = [
+  "Development Status :: 3 - Alpha",
+  "Intended Audience :: Developers",
+  "License :: OSI Approved :: MIT License",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Topic :: Utilities",
+]
 dependencies = []
 
 [project.scripts]
 cd_browser = "app.main:main"
+cd_browser_post_install = "cd_browser_post_install:main"
 
 [project.optional-dependencies]
 dev = [
@@ -27,6 +41,7 @@ dev = [
 
 [tool.setuptools]
 package-dir = {"" = "src"}
+py-modules = ["cd_browser_post_install"]
 
 [tool.setuptools.packages.find]
 where = ["src"]

scripts/ai-task

@@ -38,6 +38,33 @@ case "$TYPE_LOWER" in
 esac
 
 WORKLOG_FILE="docs/ai-worklog.md"
+PROMPTS_FILE="docs/ai-prompts.md"
+EXECUTION_LOG_FILE="docs/ai-execution-log.md"
+
+check_task_id_order() {
+  local file="$1"
+  local prefix="$2"
+  local previous=""
+  local current=""
+
+  [[ -f "$file" ]] || return 0
+
+  while IFS= read -r current; do
+    if [[ -n "$previous" && "$current" < "$previous" ]]; then
+      echo "Error: task IDs in $file are out of chronological order for prefix $prefix" >&2
+      echo "Previous: $previous" >&2
+      echo "Current:  $current" >&2
+      echo "Please fix the log order before generating a new task." >&2
+      exit 1
+    fi
+    previous="$current"
+  done < <(grep -Eo "${prefix}-[0-9]{8}-[0-9]{3}" "$file" || true)
+}
+
+check_task_id_order "$WORKLOG_FILE" "$PREFIX"
+check_task_id_order "$PROMPTS_FILE" "$PREFIX"
+check_task_id_order "$EXECUTION_LOG_FILE" "$PREFIX"
+
 LAST_SEQ=0
 
 if [[ -f "$WORKLOG_FILE" ]]; then
@@ -101,6 +128,16 @@ Logging requirements:
 - append entry to docs/ai-prompts.md
 - include Date, Task ID, Agent, Scope
 - use Task ID: ${TASK_ID}
+- maintain chronological Task ID order in ai-worklog.md, ai-prompts.md and ai-execution-log.md
+- append entry to docs/ai-execution-log.md
+
+Execution Logging requirements:
+- append entry to docs/ai-execution-log.md
+- include:
+  - full prompt
+  - agent todos
+  - final execution report
+- use the standard execution log format defined in docs/ai-execution-log.md
 
 Git requirements:
 - do NOT commit or push unless explicitly requested

src/app/config.py

@@ -5,5 +5,5 @@ from dataclasses import dataclass
 class AppConfig:
     """Application configuration."""
 
-    app_name: str = "Python AI Dev Template"
+    app_name: str = "cd-browser"
     debug: bool = False

src/app/filesystem.py

@@ -13,28 +13,95 @@ class DirectoryEntry:
     has_children: bool
 
 
-def list_directories(path: Path) -> list[DirectoryEntry]:
+@dataclass(frozen=True, slots=True)
+class FileSystemEntry:
+    """Filesystem entry metadata for tree rendering."""
+
+    name: str
+    path: Path
+    is_directory: bool
+    has_children: bool
+
+
+def list_directories(path: Path, show_hidden: bool = False) -> list[DirectoryEntry]:
     """Return direct child directories sorted by name."""
 
+    entries = list_entries(path, show_hidden=show_hidden, include_files=False)
+    return [
+        DirectoryEntry(
+            name=entry.name,
+            path=entry.path,
+            has_children=entry.has_children,
+        )
+        for entry in entries
+    ]
+
+
+def list_entries(
+    path: Path, show_hidden: bool = False, include_files: bool = False
+) -> list[FileSystemEntry]:
+    """Return direct child entries sorted by type and name."""
+
     directory_path = path.expanduser().resolve()
-    entries: list[DirectoryEntry] = []
+    entries: list[FileSystemEntry] = []
 
-    for child in directory_path.iterdir():
-        if child.is_dir():
-            entries.append(
-                DirectoryEntry(
-                    name=child.name,
-                    path=child,
-                    has_children=has_subdirectories(child),
-                )
+    try:
+        children = list(directory_path.iterdir())
+    except PermissionError:
+        return []
+
+    for child in children:
+        try:
+            is_directory = child.is_dir()
+        except OSError:
+            continue
+
+        if not is_directory and not include_files:
+            continue
+        if not show_hidden and child.name.startswith("."):
+            continue
+
+        entries.append(
+            FileSystemEntry(
+                name=child.name,
+                path=child,
+                is_directory=is_directory,
+                has_children=(
+                    has_subdirectories(child, show_hidden=show_hidden)
+                    if is_directory
+                    else False
+                ),
             )
+        )
 
-    return sorted(entries, key=lambda entry: entry.name.casefold())
+    return sorted(
+        entries,
+        key=lambda entry: (not entry.is_directory, entry.name.casefold()),
+    )
 
 
-def has_subdirectories(path: Path) -> bool:
+def has_subdirectories(path: Path, show_hidden: bool = False) -> bool:
     """Return whether the directory contains at least one subdirectory."""
 
     directory_path = path.expanduser().resolve()
 
-    return any(child.is_dir() for child in directory_path.iterdir())
+    try:
+        children = list(directory_path.iterdir())
+    except PermissionError:
+        return False
+
+    for child in children:
+        try:
+            is_directory = child.is_dir()
+        except OSError:
+            continue
+
+        if not is_directory:
+            continue
+
+        if not show_hidden and child.name.startswith("."):
+            continue
+
+        return True
+
+    return False

src/app/navigator.py

@@ -3,13 +3,13 @@ from __future__ import annotations
 from dataclasses import dataclass, field
 from pathlib import Path
 
-from app.filesystem import list_directories
+from app.filesystem import list_entries
 from app.history import SessionHistory
 
 
 @dataclass(frozen=True, slots=True)
 class VisibleEntry:
-    """A directory row visible in the navigator."""
+    """A row visible in the navigator tree."""
 
     name: str
     path: Path
@@ -17,6 +17,7 @@ class VisibleEntry:
     has_children: bool
     is_expanded: bool
     is_parent: bool = False
+    is_file: bool = False
 
 
 @dataclass(slots=True)
@@ -28,6 +29,8 @@ class Navigator:
     current_path: Path = field(init=False)
     selected_index: int = field(init=False, default=0)
     _expanded_paths: set[Path] = field(init=False, default_factory=set)
+    show_hidden: bool = False
+    show_files: bool = False
 
     def __post_init__(self) -> None:
         self.current_path = self.start_path.expanduser().resolve()
@@ -68,6 +71,9 @@ class Navigator:
     def enter_selected_directory(self) -> Path:
         """Enter the currently selected directory and record it in history."""
 
+        if self.selected_entry.is_file:
+            return self.current_path
+
         return self._change_directory(self.selected_entry.path)
 
     def go_to_parent_directory(self) -> Path:
@@ -144,6 +150,22 @@ class Navigator:
         self._set_current_path(path)
         return path
 
+    def toggle_hidden(self) -> None:
+        """Toggle showing/hiding hidden directory entries."""
+
+        self.show_hidden = not self.show_hidden
+        self._reset_view_state()
+
+    def toggle_files(self) -> None:
+        """Toggle showing/hiding file entries."""
+
+        self.show_files = not self.show_files
+        self._reset_view_state()
+
+    def _reset_view_state(self) -> None:
+        self.selected_index = 0
+        self._expanded_paths.clear()
+
     def select_history_entry(self, index: int) -> Path:
         """Jump to a directory stored in session history."""
 
@@ -154,20 +176,25 @@ class Navigator:
     def _build_entries(self, path: Path, depth: int) -> list[VisibleEntry]:
         entries: list[VisibleEntry] = []
 
-        for directory in list_directories(path):
-            is_expanded = directory.path in self._expanded_paths
+        for item in list_entries(
+            path, show_hidden=self.show_hidden, include_files=self.show_files
+        ):
+            is_expanded = (
+                item.path in self._expanded_paths if item.is_directory else False
+            )
             entries.append(
                 VisibleEntry(
-                    name=directory.name,
-                    path=directory.path,
+                    name=item.name,
+                    path=item.path,
                     depth=depth,
-                    has_children=directory.has_children,
+                    has_children=item.has_children,
                     is_expanded=is_expanded,
+                    is_file=not item.is_directory,
                 )
             )
 
             if is_expanded:
-                entries.extend(self._build_entries(directory.path, depth=depth + 1))
+                entries.extend(self._build_entries(item.path, depth=depth + 1))
 
         return entries
 

src/app/opener.py

@@ -0,0 +1,189 @@
+from __future__ import annotations
+
+import os
+import shlex
+import shutil
+import subprocess
+import sys
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Literal
+
+LaunchMode = Literal["background", "blocking"]
+
+
+@dataclass(frozen=True, slots=True)
+class OpenWithOption:
+    """Candidate application command for opening a path."""
+
+    label: str
+    command_template: str
+    executable: str
+    launch_mode: LaunchMode
+    requires_gui: bool = False
+    supports_files: bool = True
+    supports_directories: bool = True
+
+
+def available_openers(path: Path) -> list[OpenWithOption]:
+    """Return available open-with options for a file or directory path."""
+
+    is_directory = path.is_dir()
+    has_gui = _has_gui_session()
+    options: list[OpenWithOption] = []
+
+    for option in _default_options():
+        if is_directory and not option.supports_directories:
+            continue
+        if not is_directory and not option.supports_files:
+            continue
+        if option.requires_gui and not has_gui:
+            continue
+        if not shutil.which(option.executable):
+            continue
+
+        options.append(option)
+
+    return options
+
+
+def launch_background_option(path: Path, option: OpenWithOption) -> tuple[bool, str]:
+    """Launch a non-blocking option and return status/message."""
+
+    command = _command_parts(option.command_template, path)
+    if not command:
+        return False, "Invalid open command"
+
+    try:
+        subprocess.Popen(command, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+    except OSError as error:
+        return False, f"Open failed: {error}"
+
+    return True, f"Opened with {option.label}"
+
+
+def launch_blocking_option(path: Path, option: OpenWithOption) -> tuple[bool, str]:
+    """Launch a blocking terminal option and return status/message."""
+
+    command = _command_parts(option.command_template, path)
+    if not command:
+        return False, "Invalid open command"
+
+    try:
+        result = subprocess.run(command, check=False)
+    except OSError as error:
+        return False, f"Open failed: {error}"
+
+    if result.returncode != 0:
+        return (
+            False,
+            f"Open failed: {option.label} exited with code {result.returncode}",
+        )
+
+    return True, f"Opened with {option.label}"
+
+
+def is_blocking_option(option: OpenWithOption) -> bool:
+    """Return whether the option should block the current terminal session."""
+
+    return option.launch_mode == "blocking"
+
+
+def _default_options() -> tuple[OpenWithOption, ...]:
+    return (
+        OpenWithOption(
+            label="VS Code",
+            command_template="code {path}",
+            executable="code",
+            launch_mode="background",
+            requires_gui=True,
+        ),
+        OpenWithOption(
+            label="Open (system)",
+            command_template=_system_open_template(),
+            executable=_system_open_executable(),
+            launch_mode="background",
+            requires_gui=True,
+            supports_directories=False,
+        ),
+        OpenWithOption(
+            label="Antigravity",
+            command_template="antigravity {path}",
+            executable="antigravity",
+            launch_mode="background",
+        ),
+        OpenWithOption(
+            label="Neovim",
+            command_template="nvim {path}",
+            executable="nvim",
+            launch_mode="blocking",
+        ),
+        OpenWithOption(
+            label="Nano",
+            command_template="nano {path}",
+            executable="nano",
+            launch_mode="blocking",
+            supports_directories=False,
+        ),
+        OpenWithOption(
+            label="Less",
+            command_template="less {path}",
+            executable="less",
+            launch_mode="blocking",
+            supports_directories=False,
+        ),
+        OpenWithOption(
+            label="Bat",
+            command_template="bat {path}",
+            executable="bat",
+            launch_mode="blocking",
+            supports_directories=False,
+        ),
+    )
+
+
+def _has_gui_session() -> bool:
+    if os.environ.get("SSH_CONNECTION") or os.environ.get("SSH_TTY"):
+        return False
+
+    if sys.platform == "darwin":
+        return True
+
+    if sys.platform.startswith("linux"):
+        return bool(os.environ.get("DISPLAY") or os.environ.get("WAYLAND_DISPLAY"))
+
+    if sys.platform.startswith("win"):
+        return True
+
+    return False
+
+
+def _system_open_template() -> str:
+    if sys.platform == "darwin":
+        return "open {path}"
+
+    if sys.platform.startswith("linux"):
+        return "xdg-open {path}"
+
+    if sys.platform.startswith("win"):
+        return 'cmd /c start "" {path}'
+
+    return "open {path}"
+
+
+def _system_open_executable() -> str:
+    if sys.platform == "darwin":
+        return "open"
+
+    if sys.platform.startswith("linux"):
+        return "xdg-open"
+
+    if sys.platform.startswith("win"):
+        return "cmd"
+
+    return "open"
+
+
+def _command_parts(command_template: str, path: Path) -> list[str]:
+    rendered = command_template.format(path=shlex.quote(str(path)))
+    return shlex.split(rendered)

src/app/ui.py

@@ -10,8 +10,16 @@ from pathlib import Path
 from typing import TextIO
 
 from app.navigator import Navigator, VisibleEntry
+from app.opener import (
+    OpenWithOption,
+    available_openers,
+    is_blocking_option,
+    launch_background_option,
+    launch_blocking_option,
+)
 
 ESCAPE_KEY = 27
+BACKSPACE_KEYS = (curses.KEY_BACKSPACE, 127, 8)
 
 
 @dataclass(frozen=True, slots=True)
@@ -46,9 +54,13 @@ def format_entry(entry: VisibleEntry) -> str:
         return entry.name
 
     indent = "    " * entry.depth
-    indicator = " "
-    if entry.has_children:
+
+    if entry.is_file:
+        indicator = "•"
+    elif entry.has_children:
         indicator = "▼" if entry.is_expanded else "▶"
+    else:
+        indicator = " "
 
     return f"{indent}{indicator} {entry.name}"
 
@@ -104,6 +116,11 @@ class TerminalUI:
         self._history_selected_index = 0
         self._tree_scroll_offset = 0
         self._history_scroll_offset = 0
+        self._filter_mode = False
+        self._filter_query = ""
+        self._filter_selected_index = 0
+        self._filter_scroll_offset = 0
+        self._status_message: str | None = None
 
     def run(self, navigator: Navigator) -> Path:
         """Start the interactive session and return the final directory path."""
@@ -121,6 +138,16 @@ class TerminalUI:
             self._render(stdscr, navigator)
             key = stdscr.getch()
 
+            if self._history_mode:
+                self._handle_history_key(key, navigator, stdscr=stdscr)
+                continue
+
+            if self._filter_mode:
+                filter_result = self._handle_filter_key(key, navigator, stdscr)
+                if filter_result is not None:
+                    return filter_result
+                continue
+
             if key == ESCAPE_KEY:
                 return original_path
 
@@ -128,11 +155,7 @@ class TerminalUI:
                 self._toggle_history_mode(navigator)
                 continue
 
-            if self._history_mode:
-                self._handle_history_key(key, navigator)
-                continue
-
-            tree_result = self._handle_tree_key(key, navigator)
+            tree_result = self._handle_tree_key(key, navigator, stdscr=stdscr)
             if tree_result is not None:
                 return tree_result
 
@@ -145,30 +168,93 @@ class TerminalUI:
             stdscr.refresh()
             return
 
-        path_text = str(navigator.current_path)
-        stdscr.addnstr(0, 0, path_text, width - 1)
-
-        lines = build_render_lines(navigator)
-        visible_count = max(0, height - 2)
-        self._tree_scroll_offset = clamp_scroll_offset(
-            navigator.selected_index,
-            self._tree_scroll_offset,
-            visible_count,
-            len(lines),
+        hidden_status = "on" if navigator.show_hidden else "off"
+        file_status = "on" if navigator.show_files else "off"
+        path_text = (
+            f"{navigator.current_path} [hidden: {hidden_status}] [files: {file_status}]"
         )
+        stdscr.addnstr(0, 0, path_text, max(0, width - 1))
 
-        for row, line in enumerate(
-            lines[self._tree_scroll_offset : self._tree_scroll_offset + visible_count],
-            start=2,
-        ):
-            if row >= height:
-                break
+        start_row = 2
+        if self._filter_mode:
+            stdscr.addnstr(
+                1,
+                0,
+                f"Filter: {self._filter_query}",
+                max(0, width - 1),
+                curses.A_BOLD,
+            )
+            start_row = 3
 
-            attributes = curses.A_REVERSE if line.is_selected else curses.A_NORMAL
-            stdscr.addnstr(row, 0, line.text, width - 1, attributes)
+        lines, selected_index = self._build_tree_lines_for_render(navigator)
+        footer_rows = 1 if self._status_message else 0
+        visible_count = max(0, height - start_row - footer_rows)
+
+        if self._filter_mode:
+            self._filter_scroll_offset = clamp_scroll_offset(
+                selected_index,
+                self._filter_scroll_offset,
+                visible_count,
+                len(lines),
+            )
+            scroll_offset = self._filter_scroll_offset
+        else:
+            self._tree_scroll_offset = clamp_scroll_offset(
+                selected_index,
+                self._tree_scroll_offset,
+                visible_count,
+                len(lines),
+            )
+            scroll_offset = self._tree_scroll_offset
+
+        if self._filter_mode and self._filter_query and not lines:
+            stdscr.addnstr(start_row, 0, "No matches", max(0, width - 1), curses.A_DIM)
+        else:
+            for row, line in enumerate(
+                lines[scroll_offset : scroll_offset + visible_count],
+                start=start_row,
+            ):
+                if row >= height:
+                    break
+
+                attributes = curses.A_REVERSE if line.is_selected else curses.A_NORMAL
+                stdscr.addnstr(row, 0, line.text, max(0, width - 1), attributes)
+
+        if self._status_message and height > 0:
+            stdscr.addnstr(
+                height - 1,
+                0,
+                self._status_message,
+                max(0, width - 1),
+                curses.A_DIM,
+            )
 
         stdscr.refresh()
 
+    def _build_tree_lines_for_render(
+        self, navigator: Navigator
+    ) -> tuple[list[RenderLine], int]:
+        if not self._filter_mode:
+            return build_render_lines(navigator), navigator.selected_index
+
+        entries = navigator.visible_entries
+        matches = self._matching_indices(entries)
+        if not matches:
+            self._filter_selected_index = 0
+            return [], 0
+
+        self._filter_selected_index = max(
+            0, min(self._filter_selected_index, len(matches) - 1)
+        )
+
+        return [
+            RenderLine(
+                text=format_entry(entries[entry_index]),
+                is_selected=match_index == self._filter_selected_index,
+            )
+            for match_index, entry_index in enumerate(matches)
+        ], self._filter_selected_index
+
     def _render_history_mode(
         self, stdscr: curses.window, navigator: Navigator, width: int, height: int
     ) -> None:
@@ -176,7 +262,8 @@ class TerminalUI:
             navigator.history.entries(), self._history_selected_index
         )
         start_row = 1
-        visible_count = max(0, height - start_row - 1)
+        footer_rows = 1 if self._status_message else 0
+        visible_count = max(0, height - start_row - 1 - footer_rows)
         self._history_scroll_offset = clamp_scroll_offset(
             self._history_selected_index,
             self._history_scroll_offset,
@@ -184,7 +271,7 @@ class TerminalUI:
             len(history_lines),
         )
 
-        stdscr.addnstr(start_row, 0, "History:", width - 1, curses.A_BOLD)
+        stdscr.addnstr(start_row, 0, "History:", max(0, width - 1), curses.A_BOLD)
 
         for index, line in enumerate(
             history_lines[
@@ -198,17 +285,33 @@ class TerminalUI:
                 break
 
             attributes = curses.A_REVERSE if line.is_selected else curses.A_NORMAL
-            stdscr.addnstr(row, 0, line.text, width - 1, attributes)
+            stdscr.addnstr(row, 0, line.text, max(0, width - 1), attributes)
+
+        if self._status_message and height > 0:
+            stdscr.addnstr(
+                height - 1,
+                0,
+                self._status_message,
+                max(0, width - 1),
+                curses.A_DIM,
+            )
 
     def _toggle_history_mode(self, navigator: Navigator) -> None:
         self._history_mode = not self._history_mode
+        self._status_message = None
         if self._history_mode:
             self._history_selected_index = self._get_current_history_index(navigator)
             self._history_scroll_offset = 0
 
-    def _handle_history_key(self, key: int, navigator: Navigator) -> None:
+    def _handle_history_key(
+        self, key: int, navigator: Navigator, stdscr: curses.window | None = None
+    ) -> None:
         history_entries = navigator.history.entries()
 
+        if key in (ESCAPE_KEY, ord("h")):
+            self._history_mode = False
+            return
+
         if key == curses.KEY_UP:
             self._history_selected_index = move_selection(
                 self._history_selected_index,
@@ -225,12 +328,134 @@ class TerminalUI:
             )
             return
 
+        if key == curses.KEY_PPAGE:
+            step = -self._page_step(stdscr, start_row=1)
+            self._history_selected_index = move_selection(
+                self._history_selected_index,
+                step=step,
+                entry_count=len(history_entries),
+            )
+            return
+
+        if key == curses.KEY_NPAGE:
+            step = self._page_step(stdscr, start_row=1)
+            self._history_selected_index = move_selection(
+                self._history_selected_index,
+                step=step,
+                entry_count=len(history_entries),
+            )
+            return
+
+        if key in (curses.KEY_HOME, ord("g")):
+            self._history_selected_index = 0
+            return
+
+        if key in (curses.KEY_END, ord("G")) and history_entries:
+            self._history_selected_index = len(history_entries) - 1
+            return
+
         if key in (curses.KEY_ENTER, 10, 13) and history_entries:
             navigator.select_history_entry(self._history_selected_index)
             self._history_mode = False
             self._tree_scroll_offset = 0
 
-    def _handle_tree_key(self, key: int, navigator: Navigator) -> Path | None:
+    def _handle_filter_key(
+        self, key: int, navigator: Navigator, stdscr: curses.window | None = None
+    ) -> Path | None:
+        entries = navigator.visible_entries
+        matches = self._matching_indices(entries)
+
+        if key == ESCAPE_KEY:
+            self._filter_mode = False
+            self._filter_query = ""
+            self._filter_selected_index = 0
+            self._filter_scroll_offset = 0
+            return None
+
+        if key in (curses.KEY_ENTER, 10, 13):
+            if not matches:
+                return None
+
+            selected_entry_index = matches[self._filter_selected_index]
+            navigator.set_selected_index(selected_entry_index)
+            selected = entries[selected_entry_index]
+
+            self._filter_mode = False
+            self._filter_query = ""
+            self._filter_selected_index = 0
+            self._filter_scroll_offset = 0
+
+            if selected.is_file:
+                self._open_with_selected(navigator, stdscr)
+                return None
+
+            navigator.enter_selected_directory()
+            self._tree_scroll_offset = 0
+            return None
+
+        if key == curses.KEY_UP:
+            self._filter_selected_index = move_selection(
+                self._filter_selected_index,
+                step=-1,
+                entry_count=len(matches),
+            )
+            return None
+
+        if key == curses.KEY_DOWN:
+            self._filter_selected_index = move_selection(
+                self._filter_selected_index,
+                step=1,
+                entry_count=len(matches),
+            )
+            return None
+
+        if key == curses.KEY_PPAGE:
+            step = -self._page_step(stdscr, start_row=3)
+            self._filter_selected_index = move_selection(
+                self._filter_selected_index,
+                step=step,
+                entry_count=len(matches),
+            )
+            return None
+
+        if key == curses.KEY_NPAGE:
+            step = self._page_step(stdscr, start_row=3)
+            self._filter_selected_index = move_selection(
+                self._filter_selected_index,
+                step=step,
+                entry_count=len(matches),
+            )
+            return None
+
+        if key == curses.KEY_HOME:
+            self._filter_selected_index = 0
+            return None
+
+        if key == curses.KEY_END and matches:
+            self._filter_selected_index = len(matches) - 1
+            return None
+
+        if key in BACKSPACE_KEYS:
+            self._filter_query = self._filter_query[:-1]
+            self._filter_selected_index = 0
+            self._filter_scroll_offset = 0
+            return None
+
+        if 32 <= key <= 126:
+            self._filter_query += chr(key)
+            self._filter_selected_index = 0
+            self._filter_scroll_offset = 0
+
+        return None
+
+    def _handle_tree_key(
+        self,
+        key: int,
+        navigator: Navigator,
+        stdscr: curses.window | None = None,
+    ) -> Path | None:
+        self._status_message = None
+
         if key == curses.KEY_UP:
             navigator.set_selected_index(
                 move_selection(
@@ -251,8 +476,40 @@ class TerminalUI:
             )
             return None
 
+        if key == curses.KEY_PPAGE:
+            navigator.set_selected_index(
+                move_selection(
+                    navigator.selected_index,
+                    step=-self._page_step(stdscr, start_row=2),
+                    entry_count=len(navigator.visible_entries),
+                )
+            )
+            return None
+
+        if key == curses.KEY_NPAGE:
+            navigator.set_selected_index(
+                move_selection(
+                    navigator.selected_index,
+                    step=self._page_step(stdscr, start_row=2),
+                    entry_count=len(navigator.visible_entries),
+                )
+            )
+            return None
+
+        if key in (curses.KEY_HOME, ord("g")):
+            navigator.set_selected_index(0)
+            return None
+
+        if key in (curses.KEY_END, ord("G")):
+            navigator.set_selected_index(len(navigator.visible_entries) - 1)
+            return None
+
         if key == curses.KEY_RIGHT:
-            was_expanded = navigator.selected_entry.is_expanded
+            selected = navigator.selected_entry
+            if selected.is_file:
+                return None
+
+            was_expanded = selected.is_expanded
 
             if not navigator.expand_selected_directory():
                 navigator.enter_selected_directory()
@@ -282,11 +539,172 @@ class TerminalUI:
             self._tree_scroll_offset = 0
             return None
 
+        if key == ord("."):
+            navigator.toggle_hidden()
+            self._tree_scroll_offset = 0
+            return None
+
+        if key == ord("a"):
+            navigator.toggle_files()
+            self._tree_scroll_offset = 0
+            return None
+
+        if key == ord("/"):
+            self._filter_mode = True
+            self._filter_query = ""
+            self._filter_selected_index = 0
+            self._filter_scroll_offset = 0
+            return None
+
+        if key == ord("o"):
+            self._open_with_selected(navigator, stdscr)
+            return None
+
         if key in (curses.KEY_ENTER, 10, 13):
             return navigator.selected_entry.path
 
         return None
 
+    def _matching_indices(self, entries: tuple[VisibleEntry, ...]) -> list[int]:
+        if not self._filter_query:
+            return list(range(len(entries)))
+
+        query = self._filter_query.casefold()
+        return [
+            index
+            for index, entry in enumerate(entries)
+            if query in entry.name.casefold()
+        ]
+
+    def _page_step(self, stdscr: curses.window | None, start_row: int) -> int:
+        if stdscr is None:
+            return 10
+
+        height, _width = stdscr.getmaxyx()
+        footer_rows = 1 if self._status_message else 0
+        return max(1, height - start_row - footer_rows)
+
+    def _open_with_selected(
+        self, navigator: Navigator, stdscr: curses.window | None
+    ) -> None:
+        selected = navigator.selected_entry
+        options = available_openers(selected.path)
+        if not options:
+            self._status_message = "No applications available for this entry"
+            return
+
+        option_index = 0
+        if stdscr is not None:
+            choice = self._prompt_open_with_choice(stdscr, options, selected.name)
+            if choice is None:
+                self._status_message = "Open cancelled"
+                return
+
+            option_index = choice
+
+        option = options[option_index]
+        if is_blocking_option(option):
+            success, message = self._launch_blocking_with_terminal_restore(
+                stdscr, selected.path, option
+            )
+        else:
+            success, message = launch_background_option(selected.path, option)
+
+        self._status_message = message
+        if not success:
+            self._status_message = message
+
+    def _prompt_open_with_choice(
+        self,
+        stdscr: curses.window,
+        options: list[OpenWithOption],
+        entry_name: str,
+    ) -> int | None:
+        selected_index = 0
+
+        while True:
+            height, width = stdscr.getmaxyx()
+            title_row = max(0, height - len(options) - 2)
+            title = f"Open '{entry_name}' with (↑/↓, Enter, Esc):"
+
+            stdscr.addnstr(
+                title_row,
+                0,
+                " " * max(0, width - 1),
+                max(0, width - 1),
+            )
+            stdscr.addnstr(
+                title_row,
+                0,
+                title,
+                max(0, width - 1),
+                curses.A_BOLD,
+            )
+
+            for index, option in enumerate(options):
+                row = title_row + index + 1
+                if row >= height:
+                    break
+
+                attributes = (
+                    curses.A_REVERSE if index == selected_index else curses.A_NORMAL
+                )
+                label = f"  {option.label}"
+                stdscr.addnstr(
+                    row,
+                    0,
+                    " " * max(0, width - 1),
+                    max(0, width - 1),
+                )
+                stdscr.addnstr(row, 0, label, max(0, width - 1), attributes)
+
+            stdscr.refresh()
+            key = stdscr.getch()
+
+            if key == ESCAPE_KEY:
+                return None
+
+            if key == curses.KEY_UP:
+                selected_index = move_selection(
+                    selected_index,
+                    step=-1,
+                    entry_count=len(options),
+                )
+                continue
+
+            if key == curses.KEY_DOWN:
+                selected_index = move_selection(
+                    selected_index,
+                    step=1,
+                    entry_count=len(options),
+                )
+                continue
+
+            if key in (curses.KEY_ENTER, 10, 13):
+                return selected_index
+
+    def _launch_blocking_with_terminal_restore(
+        self,
+        stdscr: curses.window | None,
+        path: Path,
+        option: OpenWithOption,
+    ) -> tuple[bool, str]:
+        if stdscr is None:
+            return launch_blocking_option(path, option)
+
+        curses.def_prog_mode()
+        curses.endwin()
+
+        try:
+            success, message = launch_blocking_option(path, option)
+        finally:
+            curses.reset_prog_mode()
+            stdscr.keypad(True)
+            stdscr.clear()
+            stdscr.refresh()
+
+        return success, message
+
     def _get_current_history_index(self, navigator: Navigator) -> int:
         history_entries = navigator.history.entries()
 

src/cd_browser_post_install.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+"""Post-install script for cd-browser to guide users on shell integration."""
+
+import os
+import sys
+
+
+def _profile_for_shell(shell: str) -> str:
+    if shell == "zsh":
+        return "~/.zshrc"
+
+    return "~/.bashrc"
+
+
+def _is_cd_function_present(profile_path: str) -> bool:
+    if not os.path.exists(profile_path):
+        return False
+
+    with open(profile_path, encoding="utf-8") as profile_file:
+        return "cd_() {" in profile_file.read()
+
+
+def main() -> None:
+    """Print shell integration instructions after installation."""
+    print("\n" + "=" * 60)
+    print("🎉 cd-browser installed successfully!")
+    print("=" * 60)
+    print()
+    print(
+        "To enable the 'cd_' command, you need to add a function to your shell profile."
+    )
+    print()
+
+    shell = os.environ.get("SHELL", "").split("/")[-1]
+    profile = _profile_for_shell(shell)
+
+    cd_function = """cd_() {
+  local target
+  target="$(cd_browser)" || return
+  if [ -n "$target" ] && [ -d "$target" ]; then
+    cd "$target"
+  fi
+}"""
+
+    print(f"Copy this to the end of {profile}:")
+    print()
+    print(cd_function)
+    print()
+
+    profile_path = os.path.expanduser(profile)
+
+    try:
+        response = (
+            input("Do you want me to add it automatically? (y/n): ").strip().lower()
+        )
+        if response == "y":
+            if _is_cd_function_present(profile_path):
+                print(f"\nℹ️ cd_() already exists in {profile}, no changes made.")
+            else:
+                with open(profile_path, "a", encoding="utf-8") as f:
+                    f.write("\n" + cd_function + "\n")
+                print(f"\n✅ Added to {profile}")
+            print(f"Run 'source {profile}' or restart your terminal to activate cd_.")
+        else:
+            print(f"\nAdd the function to {profile} manually.")
+            print(f"Then run 'source {profile}' or restart terminal.")
+    except EOFError:
+        print(
+            f"\nNo interactive input detected. Add the function to {profile} manually."
+        )
+        print(f"Then run 'source {profile}' or restart terminal.")
+    except KeyboardInterrupt:
+        print("\n\nSetup cancelled. You can add the function manually later.")
+        sys.exit(0)
+
+    print("\n" + "=" * 60)
+    print(
+        f"For uninstall: after 'pip uninstall cd-browser', remove cd_() from {profile}."
+    )
+    print("=" * 60 + "\n")
+
+
+if __name__ == "__main__":
+    main()

tests/test_cli.py

@@ -4,9 +4,10 @@ import pytest
 
 from app.cli import run_cli
 from app.navigator import Navigator
+from app.ui import TerminalUI
 
 
-class StubUI:
+class StubUI(TerminalUI):
     def __init__(self, result: Path) -> None:
         self.result = result
         self.navigator: Navigator | None = None

tests/test_filesystem.py

@@ -2,7 +2,13 @@ from pathlib import Path
 
 import pytest
 
-from app.filesystem import DirectoryEntry, has_subdirectories, list_directories
+from app.filesystem import (
+    DirectoryEntry,
+    FileSystemEntry,
+    has_subdirectories,
+    list_directories,
+    list_entries,
+)
 
 
 def test_has_subdirectories_detects_nested_directory(tmp_path: Path) -> None:
@@ -44,3 +50,55 @@ def test_list_directories_raises_for_missing_directory(tmp_path: Path) -> None:
 
     with pytest.raises(FileNotFoundError):
         list_directories(missing_path)
+
+
+def test_list_entries_returns_files_when_include_files_enabled(tmp_path: Path) -> None:
+    folder = tmp_path / "folder"
+    file_path = tmp_path / "notes.txt"
+    folder.mkdir()
+    file_path.write_text("content", encoding="utf-8")
+
+    assert list_entries(tmp_path, include_files=True) == [
+        FileSystemEntry(
+            name="folder",
+            path=folder,
+            is_directory=True,
+            has_children=False,
+        ),
+        FileSystemEntry(
+            name="notes.txt",
+            path=file_path,
+            is_directory=False,
+            has_children=False,
+        ),
+    ]
+
+
+def test_list_directories_skips_permission_errors_for_children(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    allowed = root / "allowed"
+    blocked = root / "blocked"
+    allowed.mkdir()
+    blocked.mkdir()
+
+    blocked.chmod(0)
+    try:
+        entries = list_directories(root)
+    finally:
+        blocked.chmod(0o700)
+
+    assert any(entry.name == "allowed" for entry in entries)
+
+
+def test_has_subdirectories_returns_false_on_permission_error(tmp_path: Path) -> None:
+    blocked = tmp_path / "blocked"
+    blocked.mkdir()
+
+    blocked.chmod(0)
+    try:
+        result = has_subdirectories(blocked)
+    finally:
+        blocked.chmod(0o700)
+
+    assert result is False

tests/test_navigator.py

@@ -25,6 +25,49 @@ def test_navigator_initial_state_includes_parent_entry(tmp_path: Path) -> None:
     ]
 
 
+def test_toggle_hidden_directories(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    visible = root / "visible"
+    visible.mkdir()
+    hidden = root / ".hidden"
+    hidden.mkdir()
+
+    navigator = Navigator(root)
+
+    assert [entry.name for entry in navigator.visible_entries] == ["..", "visible"]
+
+    navigator.toggle_hidden()
+    assert navigator.show_hidden is True
+    assert [entry.name for entry in navigator.visible_entries] == [
+        "..",
+        ".hidden",
+        "visible",
+    ]
+
+    navigator.toggle_hidden()
+    assert navigator.show_hidden is False
+    assert [entry.name for entry in navigator.visible_entries] == ["..", "visible"]
+
+
+def test_toggle_files_includes_files_in_visible_entries(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    (root / "folder").mkdir()
+    (root / "notes.txt").write_text("hello", encoding="utf-8")
+
+    navigator = Navigator(root)
+    assert [entry.name for entry in navigator.visible_entries] == ["..", "folder"]
+
+    navigator.toggle_files()
+    assert navigator.show_files is True
+    assert [entry.name for entry in navigator.visible_entries] == [
+        "..",
+        "folder",
+        "notes.txt",
+    ]
+
+
 def test_expand_selected_directory_reveals_nested_entries(tmp_path: Path) -> None:
     current = tmp_path / "workspace"
     current.mkdir()

tests/test_opener.py

@@ -0,0 +1,147 @@
+from __future__ import annotations
+
+from pathlib import Path
+from subprocess import CompletedProcess
+
+import pytest
+
+from app.opener import (
+    OpenWithOption,
+    available_openers,
+    is_blocking_option,
+    launch_background_option,
+    launch_blocking_option,
+)
+
+
+def test_available_openers_headless_file_excludes_gui(
+    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+) -> None:
+    file_path = tmp_path / "notes.txt"
+    file_path.write_text("hello", encoding="utf-8")
+
+    monkeypatch.setenv("SSH_CONNECTION", "1")
+
+    available = {
+        "antigravity": "/usr/local/bin/antigravity",
+        "nvim": "/usr/local/bin/nvim",
+        "nano": "/usr/bin/nano",
+        "less": "/usr/bin/less",
+        "bat": "/usr/local/bin/bat",
+        "code": "/usr/local/bin/code",
+        "open": "/usr/bin/open",
+    }
+    monkeypatch.setattr("app.opener.shutil.which", lambda name: available.get(name))
+
+    labels = [option.label for option in available_openers(file_path)]
+
+    assert "VS Code" not in labels
+    assert "Open (system)" not in labels
+    assert labels == ["Antigravity", "Neovim", "Nano", "Less", "Bat"]
+
+
+def test_available_openers_gui_directory_filters_file_only_tools(
+    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+) -> None:
+    folder = tmp_path / "project"
+    folder.mkdir()
+
+    monkeypatch.delenv("SSH_CONNECTION", raising=False)
+    monkeypatch.setattr("app.opener.sys.platform", "darwin")
+
+    available = {
+        "antigravity": "/usr/local/bin/antigravity",
+        "nvim": "/usr/local/bin/nvim",
+        "nano": "/usr/bin/nano",
+        "less": "/usr/bin/less",
+        "bat": "/usr/local/bin/bat",
+        "code": "/usr/local/bin/code",
+        "open": "/usr/bin/open",
+    }
+    monkeypatch.setattr("app.opener.shutil.which", lambda name: available.get(name))
+
+    labels = [option.label for option in available_openers(folder)]
+
+    assert labels == ["VS Code", "Antigravity", "Neovim"]
+
+
+def test_launch_background_option_returns_success(
+    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+) -> None:
+    option = OpenWithOption(
+        label="VS Code",
+        command_template="code {path}",
+        executable="code",
+        launch_mode="background",
+        requires_gui=True,
+    )
+
+    monkeypatch.setattr("app.opener.subprocess.Popen", lambda *args, **kwargs: None)
+
+    success, message = launch_background_option(tmp_path, option)
+
+    assert success is True
+    assert "VS Code" in message
+
+
+def test_launch_blocking_option_reports_non_zero_exit(
+    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+) -> None:
+    option = OpenWithOption(
+        label="Neovim",
+        command_template="nvim {path}",
+        executable="nvim",
+        launch_mode="blocking",
+    )
+
+    monkeypatch.setattr(
+        "app.opener.subprocess.run",
+        lambda *args, **kwargs: CompletedProcess(args=[], returncode=2),
+    )
+
+    success, message = launch_blocking_option(tmp_path, option)
+
+    assert success is False
+    assert "code 2" in message
+
+
+def test_is_blocking_option_uses_launch_mode() -> None:
+    blocking = OpenWithOption(
+        label="Neovim",
+        command_template="nvim {path}",
+        executable="nvim",
+        launch_mode="blocking",
+    )
+    background = OpenWithOption(
+        label="VS Code",
+        command_template="code {path}",
+        executable="code",
+        launch_mode="background",
+    )
+
+    assert is_blocking_option(blocking) is True
+    assert is_blocking_option(background) is False
+
+
+def test_launch_blocking_option_handles_paths_with_spaces(
+    monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+) -> None:
+    target_path = tmp_path / "COMPETENCIAS A.LEDO"
+    option = OpenWithOption(
+        label="Neovim",
+        command_template="nvim {path}",
+        executable="nvim",
+        launch_mode="blocking",
+    )
+    captured: dict[str, list[str]] = {}
+
+    def fake_run(command: list[str], check: bool) -> CompletedProcess[object]:
+        captured["command"] = command
+        return CompletedProcess(args=[], returncode=0)
+
+    monkeypatch.setattr("app.opener.subprocess.run", fake_run)
+
+    success, _message = launch_blocking_option(target_path, option)
+
+    assert success is True
+    assert captured["command"] == ["nvim", str(target_path)]

tests/test_post_install.py

@@ -0,0 +1,47 @@
+from pathlib import Path
+
+import pytest
+
+from cd_browser_post_install import main
+
+CD_FUNCTION_SNIPPET = "cd_() {"
+
+
+def test_post_install_handles_eof_without_crashing(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture[str],
+) -> None:
+    monkeypatch.setenv("SHELL", "/bin/zsh")
+    monkeypatch.setattr(
+        "builtins.input", lambda _prompt: (_ for _ in ()).throw(EOFError)
+    )
+
+    main()
+
+    output = capsys.readouterr().out
+    assert "No interactive input detected" in output
+    assert "source ~/.zshrc" in output
+
+
+def test_post_install_adds_cd_function_once(
+    monkeypatch: pytest.MonkeyPatch,
+    tmp_path: Path,
+    capsys: pytest.CaptureFixture[str],
+) -> None:
+    monkeypatch.setenv("SHELL", "/bin/zsh")
+    monkeypatch.setenv("HOME", str(tmp_path))
+
+    responses = iter(["y", "y"])
+    monkeypatch.setattr("builtins.input", lambda _prompt: next(responses))
+
+    main()
+    main()
+
+    profile_path = tmp_path / ".zshrc"
+    content = profile_path.read_text(encoding="utf-8")
+
+    assert content.count(CD_FUNCTION_SNIPPET) == 1
+
+    output = capsys.readouterr().out
+    assert "already exists" in output
+    assert "source ~/.zshrc" in output

tests/test_ui.py

@@ -52,6 +52,19 @@ def test_format_entry_supports_parent_and_tree_indicators(tmp_path: Path) -> Non
     assert format_entry(expanded_child) == "      build"
 
 
+def test_format_entry_marks_files_with_file_indicator(tmp_path: Path) -> None:
+    file_entry = VisibleEntry(
+        name="notes.txt",
+        path=tmp_path / "notes.txt",
+        depth=0,
+        has_children=False,
+        is_expanded=False,
+        is_file=True,
+    )
+
+    assert format_entry(file_entry) == "• notes.txt"
+
+
 def test_build_render_lines_marks_selected_entry(tmp_path: Path) -> None:
     workspace = tmp_path / "workspace"
     workspace.mkdir()
@@ -221,6 +234,112 @@ def test_enter_returns_selected_path_without_navigating(tmp_path: Path) -> None:
     assert navigator.current_path == workspace.resolve()
 
 
+def test_toggle_files_key_updates_navigator_state(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    (root / "folder").mkdir()
+    (root / "notes.txt").write_text("content", encoding="utf-8")
+
+    navigator = Navigator(root)
+    ui = TerminalUI()
+
+    assert navigator.show_files is False
+    assert ui._handle_tree_key(ord("a"), navigator) is None
+    assert navigator.show_files is True
+
+
+def test_filter_matching_is_case_insensitive(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    (root / "Alpha").mkdir()
+    (root / "beta").mkdir()
+
+    navigator = Navigator(root)
+    ui = TerminalUI()
+    ui._filter_mode = True
+    ui._filter_query = "alp"
+
+    matches = ui._matching_indices(navigator.visible_entries)
+
+    assert matches == [1]
+
+
+def test_filter_mode_uses_g_and_g_upper_as_query_characters(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    (root / "alpha").mkdir()
+    (root / "gamma").mkdir()
+
+    navigator = Navigator(root)
+    ui = TerminalUI()
+    ui._filter_mode = True
+
+    assert ui._handle_filter_key(ord("g"), navigator) is None
+    assert ui._handle_filter_key(ord("G"), navigator) is None
+    assert ui._filter_query == "gG"
+
+
+def test_filter_enter_on_directory_navigates_and_exits_filter(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    child = root / "child"
+    root.mkdir()
+    child.mkdir()
+
+    navigator = Navigator(root)
+    ui = TerminalUI()
+    ui._filter_mode = True
+    ui._filter_query = "child"
+
+    result = ui._handle_filter_key(10, navigator)
+
+    assert result is None
+    assert ui._filter_mode is False
+    assert navigator.current_path == child.resolve()
+
+
+def test_filter_enter_on_file_opens_menu_and_exits_filter(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    file_path = root / "notes.txt"
+    file_path.write_text("hello", encoding="utf-8")
+
+    navigator = Navigator(root)
+    navigator.toggle_files()
+    ui = TerminalUI()
+    ui._filter_mode = True
+    ui._filter_query = "notes"
+    opened: dict[str, bool] = {"called": False}
+
+    def fake_open_with_selected(
+        _navigator: Navigator, _stdscr: curses.window | None
+    ) -> None:
+        opened["called"] = True
+
+    monkeypatch.setattr(ui, "_open_with_selected", fake_open_with_selected)
+
+    result = ui._handle_filter_key(10, navigator)
+
+    assert result is None
+    assert ui._filter_mode is False
+    assert opened["called"] is True
+    assert navigator.selected_entry.path == file_path.resolve()
+
+
+def test_end_key_jumps_to_last_entry(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    for name in ("alpha", "beta", "gamma"):
+        (root / name).mkdir()
+
+    navigator = Navigator(root)
+    ui = TerminalUI()
+
+    assert ui._handle_tree_key(curses.KEY_END, navigator) is None
+    assert navigator.selected_index == len(navigator.visible_entries) - 1
+
+
 def test_open_terminal_streams_raises_without_terminal(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None: