diff --git a/CHANGELOG.md b/CHANGELOG.md
index 743cfba..e15bf84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,16 +4,42 @@ 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
+## [0.2.3] - 2026-04-02
 
 ### 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
+- 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
diff --git a/README.md b/README.md
index 5b0b840..8799690 100644
--- a/README.md
+++ b/README.md
@@ -1,46 +1,66 @@
 # 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](docs/demo.gif)
+
+## 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
+
+- 🚀 Fast visual navigation of directory trees
+- ⌨️ Fully keyboard-driven workflow
+- 🌲 Expand and collapse directories
+- 📜 Navigation history inside the session
+- 🖥 Native terminal interface
+- 🔁 Works with Bash, Zsh and other shells
+- ⚡ Returns the selected path to the shell
+- 🔎 Press `.` to toggle hidden directories
+
+## 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 +97,8 @@ Then use:
 cd_
 ```
 
+- Dentro de `cd_browser`, presiona `.` para alternar la visualización de carpetas ocultas.
+
 ## Uninstall
 
 If the project was installed with `pip`, remove it with:
@@ -85,7 +107,7 @@ 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
 
diff --git a/docs/ai-execution-log.md b/docs/ai-execution-log.md
new file mode 100644
index 0000000..b81640f
--- /dev/null
+++ b/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.
diff --git a/docs/ai-prompts.md b/docs/ai-prompts.md
new file mode 100644
index 0000000..3305f44
--- /dev/null
+++ b/docs/ai-prompts.md
@@ -0,0 +1,221 @@
+# AI Prompts Log
+
+This file stores the prompts that triggered significant AI-driven development tasks.
+
+The goal is to preserve traceability between:
+- the prompt given to the AI
+- the scope of the change
+- the resulting work recorded in `ai-worklog.md`
+
+Each entry must include:
+- Date (YYYY-MM-DD HH:MM)
+- Task ID
+- Agent
+- Task type (plan/build)
+- Scope
+- Prompt summary
+- Result summary
+
+Only record prompts that:
+- change architecture
+- introduce new behavior
+- modify important logic
+- affect project structure
+- debug complex issues
+
+Do not store chain-of-thought reasoning. Only store the prompt intent and a concise result summary.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-15 18:05
+Task ID: BUILD-20260315-001
+Agent: OpenCode
+Task: build
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Prompt Summary:
+Implement a dedicated history mode in `src/app/ui.py` so pressing `h` hides the tree, shows only history entries, supports Up/Down navigation, and uses Enter to select a history entry and return to the normal tree view.
+
+Result Summary:
+Added a dedicated history mode with its own selection state, removed the temporary overlay behavior, preserved existing `b`/`f` and normal tree navigation behavior, and added focused UI tests.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-15 19:25
+Task ID: BUILD-20260315-002
+Agent: OpenCode
+Task: build
+
+Scope:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Prompt Summary:
+Introduce a mandatory AI logging system by updating `instructions-agent.md` and adding repository logs for AI work entries and prompt summaries.
+
+Result Summary:
+Added enforceable AI logging rules to `instructions-agent.md`, created `docs/ai-worklog.md` and `docs/ai-prompts.md`, and established a traceable workflow for recording significant AI-assisted tasks.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-15 20:00
+Task ID: BUILD-20260315-003
+Agent: OpenCode
+Task: build
+
+Scope:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Prompt Summary:
+Introduce a standard AI log entry format in `instructions-agent.md` and record the change in the repository AI logs.
+
+Result Summary:
+Added standardized `AI BUILD ENTRY` and `AI PLAN ENTRY` formats, improving consistency and long-term traceability of AI-assisted development.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-15 21:35
+Task ID: BUILD-20260315-004
+Agent: OpenCode
+Task: build
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Prompt Summary:
+Improve keyboard navigation in `src/app/ui.py` so Right expands or enters, Left collapses or goes to the parent, Enter confirms the selected destination, and ESC cancels back to the starting directory.
+
+Result Summary:
+Updated the tree-mode key handling in the terminal UI, preserved history mode behavior, and added focused UI tests for the new navigation rules.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-15 22:20
+Task ID: BUILD-20260315-005
+Agent: OpenCode
+Task: build
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Prompt Summary:
+Improve vertical scrolling in `src/app/ui.py` so the selected entry always remains visible in tree mode and history mode when the list is taller than the screen.
+
+Result Summary:
+Added UI scroll offset handling for tree and history views, kept existing navigation behavior unchanged, and added focused tests for the scroll helper logic.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-16 00:27
+Task ID: BUILD-20260316-001
+Agent: OpenCode
+Task: build
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Prompt Summary:
+Refine terminal UI navigation, maintain dedicated history mode, and ensure scrolling continuity so selections remain visible.
+
+Result Summary:
+Updated terminal UI behavior, consolidated navigation improvements, and ensured consistent scrolling and selection visibility across tree and history modes.
+
+---
+
+### BUILD PROMPT ENTRY
+Date: 2026-03-16 01:26
+Task ID: BUILD-20260316-002
+Agent: OpenCode
+Task: build
+
+Scope:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Prompt Summary:
+Finalize the AI logging format system by requiring timestamped structured log entries and aligning the repository worklog and prompt log with the current logging framework.
+
+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.
diff --git a/docs/ai-worklog.md b/docs/ai-worklog.md
new file mode 100644
index 0000000..4a195cd
--- /dev/null
+++ b/docs/ai-worklog.md
@@ -0,0 +1,377 @@
+# AI Worklog
+
+This file records important AI‑assisted development actions.
+
+The log is designed for long‑term traceability of AI‑driven development.
+
+Each entry must include:
+- Date (YYYY-MM-DD HH:MM)
+- Task ID
+- Agent
+- Task type (plan/build)
+- Objective
+- Scope
+- Files Modified / Files Inspected
+- Key Decisions or Proposed Changes
+- Validation
+- Result
+- Open Issues
+
+Entries must remain chronological.
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-15 18:10
+Task ID: BUILD-20260315-001
+Agent: OpenCode
+Task: build
+Objective: Replace the temporary history debug overlay with a dedicated history mode in the terminal UI.
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Files Modified:
+- src/app/ui.py
+- tests/test_ui.py
+
+Key Decisions:
+- Keep `b` and `f` unchanged.
+- Add separate history-mode selection state inside the UI.
+- Hide the tree while history mode is active.
+- Use Enter to select a history entry and return to the tree view.
+
+Validation:
+- make fix
+- make quality
+
+Result:
+- History mode now shows only the history list and allows navigation and selection of past directories.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-15 19:30
+Task ID: BUILD-20260315-002
+Agent: OpenCode
+Task: build
+Objective: Introduce mandatory AI logging rules and repository logging workflow.
+
+Scope:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Files Modified:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Key Decisions:
+- Require AI agents to log plan and build tasks.
+- Separate logs for work results and prompts.
+- Keep entries concise and user‑focused.
+
+Validation:
+- not run
+
+Result:
+- Repository now enforces AI logging via instructions-agent.md.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-15 20:05
+Task ID: BUILD-20260315-003
+Agent: OpenCode
+Task: build
+Objective: Introduce the standard AI log entry format and improve logging consistency.
+
+Scope:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Files Modified:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Key Decisions:
+- Define AI BUILD ENTRY and AI PLAN ENTRY blocks.
+- Standardize structure for long‑term repository traceability.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- Repository now uses a standardized AI logging format.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-15 21:40
+Task ID: BUILD-20260315-004
+Agent: OpenCode
+Task: build
+Objective: Improve keyboard navigation behavior in the terminal UI for tree mode.
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Files Modified:
+- src/app/ui.py
+- tests/test_ui.py
+
+Key Decisions:
+- Right expands collapsed directories and enters expanded directories.
+- Left collapses expanded directories or navigates to the parent directory.
+- Enter confirms the selected path.
+- ESC cancels and returns to the original directory.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- Tree navigation semantics improved with clearer expand, enter, and cancel behavior.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-15 22:25
+Task ID: BUILD-20260315-005
+Agent: OpenCode
+Task: build
+Objective: Implement vertical scrolling so the selected entry always remains visible.
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Files Modified:
+- src/app/ui.py
+- tests/test_ui.py
+
+Key Decisions:
+- Introduce scroll offsets in the UI state.
+- Clamp offsets to keep the selected row visible.
+- Apply the same mechanism to history mode.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- Tree and history views now scroll when navigating beyond the visible screen area.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-16 00:27
+Task ID: BUILD-20260316-001
+Agent: OpenCode
+Task: build
+Objective: Consolidate terminal UI navigation improvements and document updated behavior.
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Files Modified:
+- src/app/ui.py
+- tests/test_ui.py
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Key Decisions:
+- Maintain dedicated history mode.
+- Refine tree-mode keyboard behavior.
+- Keep UI logic isolated from navigator logic.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- Terminal UI now includes history mode, improved navigation semantics, and reliable vertical scrolling.
+
+Open Issues:
+- None
+
+---
+
+### AI BUILD ENTRY
+Date: 2026-03-16 01:26
+Task ID: BUILD-20260316-002
+Agent: OpenCode
+Task: build
+Objective: Finalize the AI logging format system and align repository log files with the structured logging framework.
+
+Scope:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Files Modified:
+- instructions-agent.md
+- docs/ai-worklog.md
+- docs/ai-prompts.md
+
+Key Decisions:
+- Require timestamped log entries with date and time, Task ID, Agent, and Scope fields.
+- Keep the worklog and prompt log aligned with the current structured logging framework.
+- Normalize prompt logging into a single consistent `BUILD PROMPT ENTRY` format.
+
+Validation:
+- make fix (passed)
+- make quality (passed)
+
+Result:
+- The AI logging system now uses consistent structured entries across repository instructions, worklog history, and prompt history.
+
+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
+
+---
diff --git a/docs/demo.gif b/docs/demo.gif
new file mode 100644
index 0000000..9f41407
Binary files /dev/null and b/docs/demo.gif differ
diff --git a/instructions-agent.md b/instructions-agent.md
deleted file mode 100644
index 8900952..0000000
--- a/instructions-agent.md
+++ /dev/null
@@ -1,61 +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.
diff --git a/pyproject.toml b/pyproject.toml
index e8bb8f1..6161097 100644
--- a/pyproject.toml
+++ b/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 = "0.2.3"
+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"]
diff --git a/scripts/ai-task b/scripts/ai-task
new file mode 100755
index 0000000..4c765f0
--- /dev/null
+++ b/scripts/ai-task
@@ -0,0 +1,149 @@
+#!/usr/bin/env bash
+
+# ai-task
+# Helper CLI to generate AI task prompts based on AI_TASK_TEMPLATE.md
+# Usage:
+#   scripts/ai-task build "Objective text" [scope...]
+#   scripts/ai-task plan "Objective text" [scope...]
+
+set -e
+
+TYPE="$1"
+OBJECTIVE="$2"
+shift 2 || true
+SCOPE=("$@")
+
+if [[ -z "$TYPE" || -z "$OBJECTIVE" ]]; then
+  echo "Usage: ai-task <plan|build> \"Objective\" [scope files...]"
+  exit 1
+fi
+
+TYPE_LOWER=$(echo "$TYPE" | tr '[:upper:]' '[:lower:]')
+TYPE_UPPER=$(echo "$TYPE_LOWER" | tr '[:lower:]' '[:upper:]')
+
+DATE=$(date "+%Y-%m-%d %H:%M")
+DAY=$(date "+%Y%m%d")
+
+case "$TYPE_LOWER" in
+  build)
+    PREFIX="BUILD"
+    ;;
+  plan)
+    PREFIX="PLAN"
+    ;;
+  *)
+    echo "Error: task type must be 'plan' or 'build'"
+    exit 1
+    ;;
+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 "$WORKLOG_FILE" ]]; then
+  LAST_MATCH=$(grep -Eo "${PREFIX}-${DAY}-[0-9]{3}" "$WORKLOG_FILE" | tail -n 1 || true)
+  if [[ -n "$LAST_MATCH" ]]; then
+    LAST_SEQ=${LAST_MATCH##*-}
+    LAST_SEQ=$((10#$LAST_SEQ))
+  fi
+fi
+
+NEXT_SEQ=$(printf "%03d" $((LAST_SEQ + 1)))
+TASK_ID="${PREFIX}-${DAY}-${NEXT_SEQ}"
+
+# Build scope block
+cat <<EOF
+Task Type:
+${TYPE_UPPER}
+
+Task ID:
+${TASK_ID}
+
+Date:
+${DATE}
+
+Objective:
+${OBJECTIVE}
+
+Context:
+<describe repository state if needed>
+
+Scope:
+EOF
+
+if [ ${#SCOPE[@]} -gt 0 ]; then
+  for item in "${SCOPE[@]}"; do
+    printf '%s\n' "- ${item}"
+  done
+else
+  printf '%s\n' "- <fill scope>"
+fi
+
+cat <<EOF
+
+Requirements:
+<describe expected behavior>
+
+Constraints:
+- follow AGENT_WORKFLOW.md
+- keep scope minimal
+- preserve existing behavior unless explicitly changed
+
+Testing:
+<describe expected tests>
+
+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: ${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
+
+Expected Report:
+- files changed
+- behavior changes
+- validation results
+EOF
diff --git a/src/app/config.py b/src/app/config.py
index 2f1708f..8f71179 100644
--- a/src/app/config.py
+++ b/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
diff --git a/src/app/filesystem.py b/src/app/filesystem.py
index 26e5d62..b3d72e2 100644
--- a/src/app/filesystem.py
+++ b/src/app/filesystem.py
@@ -13,28 +13,61 @@ class DirectoryEntry:
     has_children: bool
 
 
-def list_directories(path: Path) -> list[DirectoryEntry]:
+def list_directories(path: Path, show_hidden: bool = False) -> list[DirectoryEntry]:
     """Return direct child directories sorted by name."""
 
     directory_path = path.expanduser().resolve()
     entries: list[DirectoryEntry] = []
 
-    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:
+            continue
+        if not show_hidden and child.name.startswith("."):
+            continue
+
+        entries.append(
+            DirectoryEntry(
+                name=child.name,
+                path=child,
+                has_children=has_subdirectories(child, show_hidden=show_hidden),
             )
+        )
 
     return sorted(entries, key=lambda entry: 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
diff --git a/src/app/navigator.py b/src/app/navigator.py
index d93e3c4..5adbcc8 100644
--- a/src/app/navigator.py
+++ b/src/app/navigator.py
@@ -28,6 +28,7 @@ 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
 
     def __post_init__(self) -> None:
         self.current_path = self.start_path.expanduser().resolve()
@@ -144,6 +145,13 @@ 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.selected_index = 0
+        self._expanded_paths.clear()
+
     def select_history_entry(self, index: int) -> Path:
         """Jump to a directory stored in session history."""
 
@@ -154,7 +162,7 @@ class Navigator:
     def _build_entries(self, path: Path, depth: int) -> list[VisibleEntry]:
         entries: list[VisibleEntry] = []
 
-        for directory in list_directories(path):
+        for directory in list_directories(path, show_hidden=self.show_hidden):
             is_expanded = directory.path in self._expanded_paths
             entries.append(
                 VisibleEntry(
diff --git a/src/app/ui.py b/src/app/ui.py
index de509c8..b6312fc 100644
--- a/src/app/ui.py
+++ b/src/app/ui.py
@@ -22,6 +22,14 @@ class RenderLine:
     is_selected: bool
 
 
+@dataclass(frozen=True, slots=True)
+class HistoryLine:
+    """A rendered history row ready for terminal output."""
+
+    text: str
+    is_selected: bool
+
+
 def move_selection(current_index: int, step: int, entry_count: int) -> int:
     """Move the selected index within the available entry range."""
 
@@ -57,9 +65,46 @@ def build_render_lines(navigator: Navigator) -> list[RenderLine]:
     ]
 
 
+def build_history_lines(
+    entries: tuple[Path, ...], selected_index: int
+) -> list[HistoryLine]:
+    """Build all visible lines for history mode."""
+
+    return [
+        HistoryLine(text=str(path), is_selected=index == selected_index)
+        for index, path in enumerate(entries)
+    ]
+
+
+def clamp_scroll_offset(
+    selected_index: int, scroll_offset: int, visible_count: int, total_count: int
+) -> int:
+    """Keep the selected row within the visible scrolling window."""
+
+    if visible_count <= 0 or total_count <= visible_count:
+        return 0
+
+    max_offset = total_count - visible_count
+    offset = max(0, min(scroll_offset, max_offset))
+
+    if selected_index < offset:
+        return selected_index
+
+    if selected_index >= offset + visible_count:
+        return selected_index - visible_count + 1
+
+    return offset
+
+
 class TerminalUI:
     """Minimal curses UI for the directory navigator MVP."""
 
+    def __init__(self) -> None:
+        self._history_mode = False
+        self._history_selected_index = 0
+        self._tree_scroll_offset = 0
+        self._history_scroll_offset = 0
+
     def run(self, navigator: Navigator) -> Path:
         """Start the interactive session and return the final directory path."""
 
@@ -70,53 +115,53 @@ class TerminalUI:
     def _run_session(self, stdscr: curses.window, navigator: Navigator) -> Path:
         curses.curs_set(0)
         stdscr.keypad(True)
+        original_path = navigator.current_path
 
         while True:
             self._render(stdscr, navigator)
             key = stdscr.getch()
 
             if key == ESCAPE_KEY:
-                return navigator.current_path
+                return original_path
 
-            if key == curses.KEY_UP:
-                navigator.set_selected_index(
-                    move_selection(
-                        navigator.selected_index,
-                        step=-1,
-                        entry_count=len(navigator.visible_entries),
-                    )
-                )
+            if key == ord("h"):
+                self._toggle_history_mode(navigator)
                 continue
 
-            if key == curses.KEY_DOWN:
-                navigator.set_selected_index(
-                    move_selection(
-                        navigator.selected_index,
-                        step=1,
-                        entry_count=len(navigator.visible_entries),
-                    )
-                )
+            if self._history_mode:
+                self._handle_history_key(key, navigator)
                 continue
 
-            if key == curses.KEY_RIGHT:
-                navigator.expand_selected_directory()
-                continue
-
-            if key == curses.KEY_LEFT:
-                navigator.collapse_selected_directory()
-                continue
-
-            if key in (curses.KEY_ENTER, 10, 13):
-                navigator.enter_selected_directory()
+            tree_result = self._handle_tree_key(key, navigator)
+            if tree_result is not None:
+                return tree_result
 
     def _render(self, stdscr: curses.window, navigator: Navigator) -> None:
         stdscr.erase()
         height, width = stdscr.getmaxyx()
 
-        path_text = str(navigator.current_path)
+        if self._history_mode:
+            self._render_history_mode(stdscr, navigator, width=width, height=height)
+            stdscr.refresh()
+            return
+
+        hidden_status = "on" if navigator.show_hidden else "off"
+        path_text = f"{navigator.current_path} [hidden: {hidden_status}]"
         stdscr.addnstr(0, 0, path_text, width - 1)
 
-        for row, line in enumerate(build_render_lines(navigator), start=2):
+        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),
+        )
+
+        for row, line in enumerate(
+            lines[self._tree_scroll_offset : self._tree_scroll_offset + visible_count],
+            start=2,
+        ):
             if row >= height:
                 break
 
@@ -125,6 +170,138 @@ class TerminalUI:
 
         stdscr.refresh()
 
+    def _render_history_mode(
+        self, stdscr: curses.window, navigator: Navigator, width: int, height: int
+    ) -> None:
+        history_lines = build_history_lines(
+            navigator.history.entries(), self._history_selected_index
+        )
+        start_row = 1
+        visible_count = max(0, height - start_row - 1)
+        self._history_scroll_offset = clamp_scroll_offset(
+            self._history_selected_index,
+            self._history_scroll_offset,
+            visible_count,
+            len(history_lines),
+        )
+
+        stdscr.addnstr(start_row, 0, "History:", width - 1, curses.A_BOLD)
+
+        for index, line in enumerate(
+            history_lines[
+                self._history_scroll_offset : self._history_scroll_offset
+                + visible_count
+            ],
+            start=1,
+        ):
+            row = start_row + index
+            if row >= height:
+                break
+
+            attributes = curses.A_REVERSE if line.is_selected else curses.A_NORMAL
+            stdscr.addnstr(row, 0, line.text, width - 1, attributes)
+
+    def _toggle_history_mode(self, navigator: Navigator) -> None:
+        self._history_mode = not self._history_mode
+        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:
+        history_entries = navigator.history.entries()
+
+        if key == curses.KEY_UP:
+            self._history_selected_index = move_selection(
+                self._history_selected_index,
+                step=-1,
+                entry_count=len(history_entries),
+            )
+            return
+
+        if key == curses.KEY_DOWN:
+            self._history_selected_index = move_selection(
+                self._history_selected_index,
+                step=1,
+                entry_count=len(history_entries),
+            )
+            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:
+        if key == curses.KEY_UP:
+            navigator.set_selected_index(
+                move_selection(
+                    navigator.selected_index,
+                    step=-1,
+                    entry_count=len(navigator.visible_entries),
+                )
+            )
+            return None
+
+        if key == curses.KEY_DOWN:
+            navigator.set_selected_index(
+                move_selection(
+                    navigator.selected_index,
+                    step=1,
+                    entry_count=len(navigator.visible_entries),
+                )
+            )
+            return None
+
+        if key == curses.KEY_RIGHT:
+            was_expanded = navigator.selected_entry.is_expanded
+
+            if not navigator.expand_selected_directory():
+                navigator.enter_selected_directory()
+                self._tree_scroll_offset = 0
+                return None
+
+            if was_expanded:
+                navigator.enter_selected_directory()
+                self._tree_scroll_offset = 0
+
+            return None
+
+        if key == curses.KEY_LEFT:
+            if not navigator.collapse_selected_directory():
+                navigator.go_to_parent_directory()
+                self._tree_scroll_offset = 0
+
+            return None
+
+        if key == ord("b"):
+            navigator.go_back()
+            self._tree_scroll_offset = 0
+            return None
+
+        if key == ord("f"):
+            navigator.go_forward()
+            self._tree_scroll_offset = 0
+            return None
+
+        if key == ord("."):
+            navigator.toggle_hidden()
+            self._tree_scroll_offset = 0
+            return None
+
+        if key in (curses.KEY_ENTER, 10, 13):
+            return navigator.selected_entry.path
+
+        return None
+
+    def _get_current_history_index(self, navigator: Navigator) -> int:
+        history_entries = navigator.history.entries()
+
+        for index in range(len(history_entries) - 1, -1, -1):
+            if history_entries[index] == navigator.current_path:
+                return index
+
+        return 0
+
 
 @contextmanager
 def open_terminal_streams() -> Iterator[tuple[TextIO, TextIO]]:
diff --git a/src/cd_browser_post_install.py b/src/cd_browser_post_install.py
new file mode 100644
index 0000000..de36db7
--- /dev/null
+++ b/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()
diff --git a/tests/test_cli.py b/tests/test_cli.py
index f1172a4..16ce8a1 100644
--- a/tests/test_cli.py
+++ b/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
diff --git a/tests/test_filesystem.py b/tests/test_filesystem.py
index 9569e2f..eea9891 100644
--- a/tests/test_filesystem.py
+++ b/tests/test_filesystem.py
@@ -44,3 +44,33 @@ def test_list_directories_raises_for_missing_directory(tmp_path: Path) -> None:
 
     with pytest.raises(FileNotFoundError):
         list_directories(missing_path)
+
+
+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
diff --git a/tests/test_navigator.py b/tests/test_navigator.py
index 804ea51..5d48efa 100644
--- a/tests/test_navigator.py
+++ b/tests/test_navigator.py
@@ -25,6 +25,31 @@ 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_expand_selected_directory_reveals_nested_entries(tmp_path: Path) -> None:
     current = tmp_path / "workspace"
     current.mkdir()
diff --git a/tests/test_post_install.py b/tests/test_post_install.py
new file mode 100644
index 0000000..8fa8d90
--- /dev/null
+++ b/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
diff --git a/tests/test_ui.py b/tests/test_ui.py
index ae9f6d7..a43edca 100644
--- a/tests/test_ui.py
+++ b/tests/test_ui.py
@@ -1,11 +1,16 @@
+import curses
 from pathlib import Path
 
 import pytest
 
 from app.navigator import Navigator, VisibleEntry
 from app.ui import (
+    HistoryLine,
     RenderLine,
+    TerminalUI,
+    build_history_lines,
     build_render_lines,
+    clamp_scroll_offset,
     format_entry,
     move_selection,
     open_terminal_streams,
@@ -65,6 +70,157 @@ def test_build_render_lines_marks_selected_entry(tmp_path: Path) -> None:
     ]
 
 
+def test_build_history_lines_marks_selected_history_entry(tmp_path: Path) -> None:
+    first = tmp_path / "first"
+    second = tmp_path / "second"
+
+    assert build_history_lines((first, second), selected_index=1) == [
+        HistoryLine(text=str(first), is_selected=False),
+        HistoryLine(text=str(second), is_selected=True),
+    ]
+
+
+def test_clamp_scroll_offset_keeps_selection_visible_when_moving_down() -> None:
+    assert clamp_scroll_offset(5, scroll_offset=0, visible_count=3, total_count=10) == 3
+
+
+def test_clamp_scroll_offset_keeps_selection_visible_when_moving_up() -> None:
+    assert clamp_scroll_offset(1, scroll_offset=4, visible_count=3, total_count=10) == 1
+
+
+def test_clamp_scroll_offset_returns_zero_when_all_items_fit() -> None:
+    assert clamp_scroll_offset(2, scroll_offset=1, visible_count=5, total_count=3) == 0
+
+
+def test_toggle_history_mode_selects_current_history_entry(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    child = root / "child"
+    root.mkdir()
+    child.mkdir()
+
+    navigator = Navigator(root)
+    navigator.set_selected_index(1)
+    navigator.enter_selected_directory()
+    ui = TerminalUI()
+
+    ui._toggle_history_mode(navigator)
+
+    assert ui._history_mode is True
+    assert ui._history_selected_index == 1
+
+
+def test_history_mode_enter_selects_entry_and_exits(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    first = root / "first"
+    second = root / "second"
+    root.mkdir()
+    first.mkdir()
+    second.mkdir()
+
+    navigator = Navigator(root)
+    navigator.set_selected_index(1)
+    navigator.enter_selected_directory()
+    navigator.go_to_parent_directory()
+    navigator.set_selected_index(2)
+    navigator.enter_selected_directory()
+
+    ui = TerminalUI()
+    ui._toggle_history_mode(navigator)
+    ui._handle_history_key(curses.KEY_UP, navigator)
+    ui._handle_history_key(10, navigator)
+
+    assert ui._history_mode is False
+    assert navigator.current_path == root.resolve()
+    assert navigator.selected_index == 0
+
+
+def test_history_mode_toggle_off_keeps_current_directory(tmp_path: Path) -> None:
+    root = tmp_path / "root"
+    root.mkdir()
+    navigator = Navigator(root)
+    ui = TerminalUI()
+
+    ui._toggle_history_mode(navigator)
+    ui._toggle_history_mode(navigator)
+
+    assert ui._history_mode is False
+    assert navigator.current_path == root.resolve()
+
+
+def test_right_arrow_expands_collapsed_directory(tmp_path: Path) -> None:
+    workspace = tmp_path / "workspace"
+    scripts = workspace / "scripts"
+    build = scripts / "build"
+    workspace.mkdir()
+    scripts.mkdir()
+    build.mkdir()
+
+    navigator = Navigator(workspace)
+    navigator.set_selected_index(1)
+    ui = TerminalUI()
+
+    assert ui._handle_tree_key(curses.KEY_RIGHT, navigator) is None
+    assert navigator.current_path == workspace.resolve()
+    assert [entry.name for entry in navigator.visible_entries] == [
+        "..",
+        "scripts",
+        "build",
+    ]
+
+
+def test_right_arrow_enters_already_expanded_directory(tmp_path: Path) -> None:
+    workspace = tmp_path / "workspace"
+    scripts = workspace / "scripts"
+    build = scripts / "build"
+    workspace.mkdir()
+    scripts.mkdir()
+    build.mkdir()
+
+    navigator = Navigator(workspace)
+    navigator.set_selected_index(1)
+    navigator.expand_selected_directory()
+    ui = TerminalUI()
+
+    assert ui._handle_tree_key(curses.KEY_RIGHT, navigator) is None
+    assert navigator.current_path == scripts.resolve()
+    assert navigator.selected_index == 0
+
+
+def test_left_arrow_goes_to_parent_when_selected_entry_is_collapsed(
+    tmp_path: Path,
+) -> None:
+    parent = tmp_path / "parent"
+    current = parent / "current"
+    child = current / "child"
+    parent.mkdir()
+    current.mkdir()
+    child.mkdir()
+
+    navigator = Navigator(current)
+    navigator.set_selected_index(1)
+    ui = TerminalUI()
+
+    assert ui._handle_tree_key(curses.KEY_LEFT, navigator) is None
+    assert navigator.current_path == parent.resolve()
+    assert navigator.selected_index == 0
+
+
+def test_enter_returns_selected_path_without_navigating(tmp_path: Path) -> None:
+    workspace = tmp_path / "workspace"
+    child = workspace / "child"
+    workspace.mkdir()
+    child.mkdir()
+
+    navigator = Navigator(workspace)
+    navigator.set_selected_index(1)
+    ui = TerminalUI()
+
+    result = ui._handle_tree_key(10, navigator)
+
+    assert result == child.resolve()
+    assert navigator.current_path == workspace.resolve()
+
+
 def test_open_terminal_streams_raises_without_terminal(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None: