lesson

スター13

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更新日2026年3月13日 07:07

Record a lesson learned after fixing a bug or discovering a pattern. Updates domain memory files and checks for contradictions. Use after resolving non-trivial issues.

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Embassy-of-the-Free-Mind

Embassy-of-the-Free-Mind/sourcelibrary-v2

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Record a Lesson Learned

After fixing a bug, resolving an incident, or discovering an important pattern, record it for future sessions.

Steps

Classify the domain. Determine which memory file this belongs to:
- Pipeline/cron/Lambda/workers → memory/pipeline-ops.md
- Data quality/known bugs → memory/data-quality.md
- UI/frontend/navigation → memory/ui-navigation.md
- MCP server/CLI → memory/mcp-server.md
- Cross-cutting/general → memory/lessons-learned.md
- If it's a critical safety rule → also add to MEMORY.md (keep under 200 lines)
Check for contradictions. Read the target memory file and check:
- Does this contradict an existing entry? → Update the old entry, don't duplicate.
- Does this make an existing entry obsolete? → Remove or update it.
- Is there already an entry for this? → Strengthen it with new detail, don't duplicate.
Write the entry. Format:
```
- **Short description (YYYY-MM-DD):** What happened, what the fix was, and the general rule to follow going forward.
```
- Always include the date.
- State the rule (what to do), not just the story (what happened).
- Keep it to 1-2 lines. Link to files/docs if details are needed.
Check staleness nearby. While editing, scan neighboring entries:
- Any entry with a date older than 30 days → verify it's still accurate or mark (verify).
- Any entry referencing a file path → quick-check the file still exists.
- Any entry with stats/counts → mark as (snapshot, may be stale) if not already marked.
Report. Tell the user what was added, what was updated, and any stale entries found.

Examples

Good entry:

- **Lambda timeout on large books (2026-03-13):** Books with >500 pages can exceed Lambda 15min timeout. Split into chunks of 400 pages max. See `src/lib/lambda-queue.ts:128`.

Bad entry (no date, no rule):

- Fixed the Lambda timeout issue.

When NOT to use this

Trivial fixes (typos, one-line changes) — not worth recording
Session-specific context — use handoffs instead
Speculative conclusions from reading one file — verify first

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Record a Lesson Learned

After fixing a bug, resolving an incident, or discovering an important pattern, record it for future sessions.

Steps

Classify the domain. Determine which memory file this belongs to:

Pipeline/cron/Lambda/workers → memory/pipeline-ops.md
Data quality/known bugs → memory/data-quality.md
UI/frontend/navigation → memory/ui-navigation.md
MCP server/CLI → memory/mcp-server.md
Cross-cutting/general → memory/lessons-learned.md
If it's a critical safety rule → also add to MEMORY.md (keep under 200 lines)

Check for contradictions. Read the target memory file and check:

Does this contradict an existing entry? → Update the old entry, don't duplicate.
Does this make an existing entry obsolete? → Remove or update it.
Is there already an entry for this? → Strengthen it with new detail, don't duplicate.

Write the entry. Format:

- **Short description (YYYY-MM-DD):** What happened, what the fix was, and the general rule to follow going forward.

Always include the date.
State the rule (what to do), not just the story (what happened).
Keep it to 1-2 lines. Link to files/docs if details are needed.

Check staleness nearby. While editing, scan neighboring entries:

Any entry with a date older than 30 days → verify it's still accurate or mark (verify).
Any entry referencing a file path → quick-check the file still exists.
Any entry with stats/counts → mark as (snapshot, may be stale) if not already marked.

Report. Tell the user what was added, what was updated, and any stale entries found.

Examples

Good entry:

- **Lambda timeout on large books (2026-03-13):** Books with >500 pages can exceed Lambda 15min timeout. Split into chunks of 400 pages max. See `src/lib/lambda-queue.ts:128`.

Bad entry (no date, no rule):

- Fixed the Lambda timeout issue.

When NOT to use this

Trivial fixes (typos, one-line changes) — not worth recording

Session-specific context — use handoffs instead

Speculative conclusions from reading one file — verify first

name	lesson
description	Record a lesson learned after fixing a bug or discovering a pattern. Updates domain memory files and checks for contradictions. Use after resolving non-trivial issues.