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phase: 03-orchestration
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plan: 01
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subsystem: orchestration
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tags: [tmux, command-execution, output-capture, error-detection, libtmux]
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# Dependency graph
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requires:
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- phase: 01-core-infrastructure
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provides: TmuxSession, TmuxSessionManager for session management
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provides:
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- CommandExecutor class for sending commands and capturing output
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- OutputCapture class for prompt detection and stabilization
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- CommandResult dataclass for execution results
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affects: [03-02, 03-03, 04-full-command-support]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- Mock-based testing for tmux integration (no real tmux server required)
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- Content-hash based stabilization detection
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- Word-boundary matching for ASCII error keywords, substring for non-ASCII
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key-files:
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created:
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- src/gsd_openclaw/command_executor.py
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- tests/test_command_executor.py
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modified:
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- src/gsd_openclaw/__init__.py
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key-decisions:
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- "60 second default timeout for command execution (from CONTEXT.md user decision)"
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- "3 consecutive polls with same output hash for stabilization detection"
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- "Word-boundary regex for ASCII error keywords, simple substring for Chinese"
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patterns-established:
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- "CommandResult dataclass with output, completed, has_error, error_type fields"
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- "OutputCapture with PROMPT_PATTERNS for shell prompt detection"
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- "CommandExecutor with ERROR_KEYWORDS for error detection"
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requirements-completed: [BRDG-02, BRDG-03]
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# Metrics
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duration: 5min
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completed: 2026-03-11
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---
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# Phase 3 Plan 1: Command Execution Layer Summary
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**Command execution with output capture, prompt detection, and error keyword detection using mock-based testing**
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## Performance
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- **Duration:** 5 min
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- **Started:** 2026-03-11T07:44:54Z
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- **Completed:** 2026-03-11T07:49:48Z
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- **Tasks:** 3
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- **Files modified:** 3
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## Accomplishments
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- Implemented CommandExecutor class for sending commands to tmux sessions
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- Implemented OutputCapture class with prompt pattern detection and output stabilization
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- Added error detection supporting both English and Chinese keywords
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- Created comprehensive test suite with 24 tests (341 lines)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create test scaffold for command executor** - `67f9d70` (test)
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2. **Task 2: Implement OutputCapture class** - `7b682df` (feat)
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3. **Task 3: Implement CommandExecutor class** - `7b682df` (feat)
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**Plan metadata:** `1dd4b3a` (feat: export classes from package)
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_Note: Tasks 2 and 3 were implemented together in a single commit since the implementation was cohesive._
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## Files Created/Modified
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- `src/gsd_openclaw/command_executor.py` - Command execution and output capture with CommandResult, OutputCapture, CommandExecutor classes
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- `tests/test_command_executor.py` - Comprehensive test suite with 24 tests for command execution
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- `src/gsd_openclaw/__init__.py` - Added exports for CommandResult, OutputCapture, CommandExecutor
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## Decisions Made
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- Used 60 second default timeout as specified in CONTEXT.md user decision
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- Implemented stabilization detection using content hash comparison (not just line count)
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- Used word-boundary regex matching for ASCII error keywords to avoid false positives
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- Used simple substring matching for Chinese keywords (word boundary doesn't work with non-ASCII)
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed prompt pattern matching to avoid false positives**
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- **Found during:** Task 2 (OutputCapture implementation)
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- **Issue:** Pattern `^\$\s+` matched lines like "$ not a prompt" incorrectly
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- **Fix:** Changed to use only patterns with end-of-line anchors (`^\$\s*$`)
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- **Files modified:** src/gsd_openclaw/command_executor.py
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- **Verification:** Test `test_is_prompt_returns_false_for_non_prompt_lines` passes
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- **Committed in:** 7b682df (Task 2 commit)
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**2. [Rule 1 - Bug] Fixed stabilization detection to check content not just line count**
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- **Found during:** Task 2 (OutputCapture implementation)
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- **Issue:** Stabilization was detected based only on line count, causing false positives when content changed but line count stayed same
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- **Fix:** Changed to use content hash comparison instead of line count
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- **Files modified:** src/gsd_openclaw/command_executor.py
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- **Verification:** Test `test_capture_until_complete_returns_false_on_timeout` passes
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- **Committed in:** 7b682df (Task 2 commit)
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**3. [Rule 1 - Bug] Fixed error detection to use word boundaries**
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- **Found during:** Task 2 (CommandExecutor implementation)
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- **Issue:** Simple substring matching caused "Traceback" to match "error" (substring in lowercase)
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- **Fix:** Used word-boundary regex for ASCII keywords, substring for non-ASCII
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- **Files modified:** src/gsd_openclaw/command_executor.py
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- **Verification:** Test `test_detect_errors_returns_true_for_exception_keyword` passes
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- **Committed in:** 7b682df (Task 2 commit)
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---
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**Total deviations:** 3 auto-fixed (all Rule 1 - Bug fixes)
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**Impact on plan:** All auto-fixes necessary for correctness. No scope creep.
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## Issues Encountered
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None - implementation proceeded smoothly following TDD approach.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Command execution layer complete, ready for orchestrator implementation
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- OutputCapture and CommandExecutor can be used by Phase 3 Plan 2 for command routing
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- All 128 tests pass across the project
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---
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*Phase: 03-orchestration*
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*Completed: 2026-03-11*
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