docs(04-01): complete container log retrieval plan

Tasks completed: 3/3
- Add logs command routing to workflow
- Implement Docker logs API call with formatting
- Handle Docker log stream binary format

SUMMARY: .planning/phases/04-logs-intelligence/04-01-SUMMARY.md

.planning/STATE.md

@@ -8,10 +8,10 @@
 ## Current Position
 
 - **Milestone:** v1.0 — Conversational Docker Control
-- **Phase:** 3 of 5 — Container Actions (COMPLETE)
-- **Plan:** 4 of 4 complete
-- **Status:** Phase 3 complete and verified
-- **Last activity:** 2026-01-30 - Phase 3 verified (14/14 must-haves)
+- **Phase:** 4 of 5 — Logs & Intelligence (IN PROGRESS)
+- **Plan:** 1 of 2 executed
+- **Status:** Phase 4 in progress - container log retrieval complete
+- **Last activity:** 2026-01-30 - Completed 04-01-PLAN.md (container log retrieval)
 
 ## Progress
 
@@ -19,10 +19,10 @@
 Phase 1: Foundation         [██████████] Complete (2/2 plans)
 Phase 2: Docker Integration [██████████] Complete (2/2 plans)
 Phase 3: Container Actions  [██████████] Complete (4/4 plans)
-Phase 4: Logs & Intelligence[░░░░░░░░░░] Not started
+Phase 4: Logs & Intelligence[█████░░░░░] In progress (1/2 plans)
 Phase 5: Polish & Deploy    [░░░░░░░░░░] Not started
 
-Overall: [██████████] 60%
+Overall: [███████░░░] 70%
 ```
 
 ## Recent Decisions
@@ -50,6 +50,10 @@ Overall: [██████████] 60%
 | Silent when no update | Only notify on actual image change, not when already up-to-date | 2026-01-30 |
 | Single match only for update | Update requires exact container name, no batch updates | 2026-01-30 |
 | Version from OCI labels | Check org.opencontainers.image.version, then version, then ID | 2026-01-30 |
+| Docker logs API with tail parameter | More efficient than fetching all logs and filtering in code | 2026-01-30 |
+| Binary stream header via charCodeAt | Docker multiplexed stream uses byte 0 values 1/2, strip 8 bytes | 2026-01-30 |
+| Default 50 lines, cap at 1000 | Balance between useful context and Telegram limits | 2026-01-30 |
+| Truncate at 3800 chars | Telegram limit is 4096, leave room for header and formatting | 2026-01-30 |
 
 ## Pending Todos
 
@@ -62,10 +66,10 @@ Overall: [██████████] 60%
 ## Session Continuity
 
 - **Last session:** 2026-01-30
-- **Stopped at:** Phase 3 verified and complete
+- **Stopped at:** Completed 04-01-PLAN.md (container log retrieval)
 - **Resume file:** None
-- **Next step:** Plan Phase 4 - Logs & Intelligence
-- **Resume command:** `/gsd:discuss-phase 4` or `/gsd:plan-phase 4`
+- **Next step:** Execute 04-02-PLAN.md (Claude log analysis)
+- **Resume command:** `/gsd:execute-plan .planning/phases/04-logs-intelligence/04-02-PLAN.md`
 
 ---
 *Auto-maintained by GSD workflow*

.planning/phases/04-logs-intelligence/04-01-SUMMARY.md

@@ -0,0 +1,130 @@
+---
+phase: 04-logs-intelligence
+plan: 01
+subsystem: logs
+tags: [docker-logs, telegram-bot, n8n, log-streaming]
+
+# Dependency graph
+requires:
+  - phase: 02-docker-integration
+    provides: Docker API integration and container matching patterns
+  - phase: 03-container-actions
+    provides: Action command routing and fuzzy container matching
+provides:
+  - Container log retrieval via Telegram commands
+  - Configurable line count (default 50, max 1000)
+  - Binary stream decoder for Docker logs API
+  - Formatted log output with monospace display
+affects: [04-02-claude-analysis]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Docker logs API multiplexed stream decoding"
+    - "Telegram message truncation for long content"
+
+key-files:
+  created: []
+  modified:
+    - n8n-workflow.json
+
+key-decisions:
+  - "Use Docker logs API with tail parameter for line-limited retrieval"
+  - "Strip 8-byte binary headers from Docker multiplexed stream"
+  - "Truncate at 3800 chars to stay within Telegram 4096 limit"
+  - "Default to 50 lines when not specified, cap at 1000 max"
+
+patterns-established:
+  - "Binary stream decoding: check charCodeAt(0) <= 2 for header presence"
+  - "Log formatting: <pre> tags for monospace, HTML parse mode"
+
+# Metrics
+duration: 3min
+completed: 2026-01-30
+---
+
+# Phase 04 Plan 01: Container Log Retrieval Summary
+
+**Container log retrieval via Telegram with Docker API binary stream decoding and configurable line limits**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-01-31T02:40:38Z
+- **Completed:** 2026-01-31T02:43:37Z
+- **Tasks:** 3
+- **Files modified:** 1
+
+## Accomplishments
+- Users can request logs for any container by name via Telegram
+- Configurable line count (default 50, max 1000 lines)
+- Docker logs API binary stream format properly decoded
+- Logs displayed in readable monospace format with truncation for Telegram limits
+
+## Task Commits
+
+Implementation was atomic - all tasks completed in single commit:
+
+1. **Tasks 1-3: Complete logs implementation** - `93c40fe` (feat)
+   - Task 1: Logs command routing
+   - Task 2: Docker logs API integration
+   - Task 3: Binary stream format handling
+
+**Note:** All three tasks were interdependent and completed together in a single atomic commit since they form a cohesive feature implementation.
+
+## Files Created/Modified
+- `n8n-workflow.json` - Added 11 new nodes for complete logs workflow:
+  - Parse Logs Command: Extract container name and line count from user message
+  - Docker List for Logs: Fetch containers for matching
+  - Match Logs Container: Fuzzy match container name
+  - Check Logs Match Count: Route based on match results
+  - Build Logs Command: Construct Docker API curl with tail parameter
+  - Execute Logs: Call Docker logs API
+  - Format Logs: Decode binary stream, truncate, add monospace formatting
+  - Send Logs Response: Reply to user via Telegram
+  - Error handlers: No match, multiple matches, Docker errors
+
+## Decisions Made
+
+**1. Docker logs API with tail parameter**
+- **Rationale:** More efficient than fetching all logs and filtering in code
+- **Implementation:** `http://localhost/v1.47/containers/{id}/logs?stdout=1&stderr=1&tail={lines}&timestamps=1`
+
+**2. Binary stream header detection via charCodeAt(0)**
+- **Rationale:** Docker multiplexed stream uses byte 0 values 1 (stdout) or 2 (stderr)
+- **Implementation:** Check if `charCodeAt(0) <= 2` and length > 8, then strip first 8 bytes
+- **Robustness:** Works even if some lines lack headers (mixed format tolerance)
+
+**3. Default 50 lines, cap at 1000**
+- **Rationale:** Balance between useful context and Telegram message limits
+- **Safety:** 1000 line cap prevents excessive API calls and message truncation
+
+**4. Truncate at 3800 chars**
+- **Rationale:** Telegram limit is 4096, leave room for header and formatting tags
+- **UX:** Add "... (truncated)" indicator when limit hit
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None - Docker logs API worked as expected, binary stream format handled correctly.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+Ready for Phase 04 Plan 02 (Claude log analysis):
+- Log retrieval working and tested
+- Format suitable for Claude API input
+- Error handling in place for edge cases
+
+Logs are now available programmatically for Claude to analyze in next plan.
+
+---
+*Phase: 04-logs-intelligence*
+*Completed: 2026-01-30*