---
title: "Prompt Versioning – Execution Log"
phase: Execute
date: "2026-02-28T16:00:00"
owner: "claude"
plan_path: "memory-bank/plan/2026-02-28_15-45-00_prompt_versioning.md"
start_commit: "795fd8f1"
env: {target: "local", notes: "Development environment"}
---

## Pre-Flight Checks

### DoR (Definition of Ready)
- [x] Plan exists and is complete
- [x] All tasks have acceptance criteria
- [x] Dependencies are clear
- [x] Risk mitigations identified

### Access/Secrets
- [x] No external dependencies requiring secrets
- [x] All code is local

### Fixtures/Data
- [x] Existing prompt files exist
- [x] Cache infrastructure exists
- [x] No external fixtures required

### Blockers
None identified.

---

## Execution Summary

| Task | Status | Commit | Notes |
|------|--------|--------|-------|
| T1 | Complete | 1173d730 | Define PromptVersion dataclass |
| T2 | Complete | 1173d730 | Define AgentPromptVersions dataclass |
| T3 | Complete | 3a102d2c | Create compute_prompt_version() function |
| T4 | Complete | 3a102d2c | Create compute_agent_prompt_versions() aggregator |
| T5 | Complete | 3a102d2c | Write unit tests for version computation (15 tests) |
| T6 | Complete | df77e95a | Create PromptVersionCache class |
| T7 | Complete | d7cbc705 | Modify load_system_prompt() to capture version |
| T8 | Complete | d7cbc705 | Modify load_tunacode_context() to capture version |
| T9 | Complete | d7cbc705 | Capture tool XML prompt versions |
| T10 | Complete | d7cbc705 | Attach versions to agent instances |
| T11 | Complete | 262d62a2 | Add version logging at agent creation |
| T12 | Complete | 262d62a2 | Create version display CLI utility |
| T13 | Complete | 262d62a2 | Write developer documentation |

---

## Task Details

### T1, T2 - Core Data Structures (M1)
**Commit:** 1173d730
- Added `PromptVersion` dataclass to `src/tunacode/types/canonical.py`
- Added `AgentPromptVersions` dataclass to `src/tunacode/types/canonical.py`
- Both are frozen dataclasses with slots=True

### T3, T4, T5 - Version Computation Module (M2)
**Commit:** 3a102d2c
- Created `src/tunacode/prompts/versioning.py`:
  - `compute_prompt_version()`: SHA-256 hash computation
  - `compute_agent_prompt_versions()`: aggregate versions
  - `versions_equal()`, `agent_versions_equal()`: comparison utilities
- Created `tests/unit/prompts/test_versioning.py`: 15 tests, all passing

### T6 - Cache Integration (M3)
**Commit:** df77e95a
- Created `src/tunacode/infrastructure/cache/caches/prompt_version_cache.py`
  - `get_prompt_version()`: mtime-aware cache retrieval
  - `set_prompt_version()`: store with mtime metadata
  - `invalidate_prompt_version()`, `clear_prompt_versions()`
- Added `get_or_compute_prompt_version()` to versioning.py

### T7, T8, T9, T10 - Agent Integration (M4)
**Commit:** d7cbc705
- Modified `load_system_prompt()` to return (content, PromptVersion)
- Modified `load_tunacode_context()` to return (content, PromptVersion)
- Added `get_xml_prompt_path()` to xml_helper.py
- Modified `to_tinyagent_tool()` to capture and attach prompt_version
- Modified `get_or_create_agent()` to:
  - Collect tool prompt paths
  - Compute AgentPromptVersions
  - Attach prompt_versions attribute to agent
  - Log version hashes

### T11, T12, T13 - Observability (M5)
**Commit:** 262d62a2
- Version logging already integrated in T10
- Created `src/tunacode/prompts/version_display.py`:
  - `format_prompt_version()`, `display_prompt_versions()`
  - `get_current_prompt_versions()`, `print_prompt_versions()`
- Created `docs/modules/prompts/versioning.md`:
  - Architecture overview
  - Usage examples
  - Caching strategy
  - Integration points

### Gate Fixes
**Commit:** 0f436c11
- Fixed type annotation for tool_prompt_paths (dict[str, Path | str])
- Removed __all__ exports from versioning modules
- All 15 unit tests passing

---

## Gate Results

### Tests
- **Unit tests:** 15/15 passing in `tests/unit/prompts/test_versioning.py`

### Type Checks
- **Mypy:** Pre-existing errors in constants.py, thinking_state.py (not related to this work)
- **New code:** Type clean

### Linters
- **Ruff:** Passed
- **Bandit:** Passed (security)
- **Dependency layers:** Passed

### Note on Gate 0 (Shims)
The project has existing __all__ exports in canonical.py and other files.
This is a pre-existing codebase pattern, not introduced by this work.

---

## Deployment Notes

**Environment:** local (development)
**No deployment required** - this is a library feature addition.

---

## Success Criteria

- [x] All planned tasks completed (13/13)
- [x] Unit tests passing (15/15)
- [x] Type checks clean for new code
- [x] Documentation written
- [x] No breaking changes to existing API

---

## Files Created

| File | Purpose |
|------|---------|
| `src/tunacode/prompts/versioning.py` | Version computation module |
| `src/tunacode/prompts/version_display.py` | Display utilities |
| `src/tunacode/infrastructure/cache/caches/prompt_version_cache.py` | Version cache |
| `tests/unit/prompts/test_versioning.py` | Unit tests |
| `docs/modules/prompts/versioning.md` | Documentation |

## Files Modified

| File | Changes |
|------|---------|
| `src/tunacode/types/canonical.py` | Added PromptVersion, AgentPromptVersions |
| `src/tunacode/core/agents/agent_components/agent_config.py` | Integrated version tracking |
| `src/tunacode/tools/decorators.py` | Capture tool prompt versions |
| `src/tunacode/tools/xml_helper.py` | Added get_xml_prompt_path() |

---

## Final Commit Summary

| Commit | Description |
|--------|-------------|
| 795fd8f1 | Rollback baseline |
| 1173d730 | feat(T1,T2): Add PromptVersion and AgentPromptVersions dataclasses |
| 3a102d2c | feat(T3,T4,T5): Add prompt version computation module and tests |
| df77e95a | feat(T6): Add PromptVersionCache with mtime-aware invalidation |
| d7cbc705 | feat(T7,T8,T9,T10): Integrate version tracking into agent creation |
| 262d62a2 | feat(T11,T12,T13): Add observability features and documentation |
| 0f436c11 | fix: Resolve type errors and remove __all__ exports from versioning |

**End Commit:** 0f436c11
| T3 | Pending | - | Create compute_prompt_version() function |
| T4 | Pending | - | Create compute_agent_prompt_versions() aggregator |
| T5 | Pending | - | Write unit tests for version computation |
| T6 | Pending | - | Create PromptVersionCache class |
| T7 | Pending | - | Modify load_system_prompt() to capture version |
| T8 | Pending | - | Modify load_tunacode_context() to capture version |
| T9 | Pending | - | Capture tool XML prompt versions |
| T10 | Pending | - | Attach versions to agent instances |
| T11 | Pending | - | Add version logging at agent creation |
| T12 | Pending | - | Create version display utility |
| T13 | Pending | - | Write developer documentation |

---
