Sync Docs

Sync official Anthropic documentation into docs/reference/ and produce an impact analysis report.

Quick Start

Run the sync and diff script:

scripts/sync_and_diff.py

Preview changes without overwriting:

scripts/sync_and_diff.py --dry-run

Execution

Phase 1: Sync & Diff

1. Execute scripts/sync_and_diff.py (or with --dry-run if $ARGUMENTS contains --dry-run)

   Capture the whole JSON document. Never pipe it through tail/head — sync_health and sync_result are at the top of the output and are the first things to read.

2. Gate on sync_health before anything else:

   • If sync_health.complete is true, proceed to step 3.
   • If sync_health.complete is false, stop and do not report impacts for the files in sync_health.not_fetched. Their "changed": false only means "not downloaded", not "up to date". Print sync_health.warning, re-run the sync once to retry the failed files, and if they still fail, report them explicitly as UNVERIFIED in the summary table rather than as unchanged.

   update-claude-docs.sh exits 0 when at least one file downloads, so a non-zero exit code is not the signal — a 1-of-8 sync also exits 0. Trust sync_health, not sync_result.exit_code.

3. Parse the rest of the JSON output

4. Display a summary table of changed/unchanged files, using download_status to mark any file that was not fetched

Phase 2: Impact Analysis

For each changed file, perform the following analysis. See WORKFLOW.md for detailed steps.

2a. Skill Validator Impact (CRITICAL priority)

Check discrepancies in the JSON output:

• skill_frontmatter_keys.in_docs_not_validator (CRITICAL): New fields in SKILLS.md the validator will reject as unknown (FM009). Report exact fields and line in validate_skill.py to update (ALLOWED_FRONTMATTER_KEYS, ~line 151).
• skill_frontmatter_keys.in_validator_not_docs (WARNING): Fields the validator allows but SKILLS.md no longer documents. May be from SUBAGENTS.md (valid for context: fork) or deprecated.
• subagent_frontmatter_keys (INFO): New subagent fields from SUBAGENTS.md. Not all are valid in skill frontmatter — report for context. Only flag fields that overlap with skill usage (e.g., maxTurns, mcpServers, memory, skills).
• hook_events.in_docs_not_validator (CRITICAL): New hook events the validator will reject (HK001). Report the line to update (VALID_HOOK_EVENTS, ~line 1021).
• hook_events.in_validator_not_docs (WARNING): Hook events the validator knows but docs no longer list.
• memory_scopes: Review manually if SUBAGENTS.md changed — check if memory scope options expanded.

2b. Plugin Component Impact (WARNING priority)

For each changed synced doc, identify the conceptual areas that changed (new fields, deprecated features, renamed concepts). Then:

1. Use Grep to search plugins/*/ for references to changed concepts
2. Flag plugins using deprecated patterns
3. Note new capabilities not yet leveraged (as INFO)

2c. Project Documentation Impact (WARNING priority)

Check these files for stale references to synced doc content:

• CLAUDE.md — Plugin Component Guidelines section, Key Documentation Files section
• docs/README.md — Synced Documentation section, learning paths
• docs/SKILL_DEVELOPMENT_BEST_PRACTICES.md — Frontmatter reference, patterns

Output Format

Present findings as a structured report:

=== Documentation Sync Impact Report ===

## Sync Summary
| File | Status | +Lines | -Lines | New Sections | Removed Sections |
|------|--------|--------|--------|--------------|-----------------|
...

## CRITICAL: Skill Validator Updates Required
(List each discrepancy with file, line number, and fix)

## WARNING: Plugin Components Affected
(List affected plugins and what changed)

## WARNING: Project Documentation Stale
(List affected doc files and what to update)

## INFO: New Capabilities Available
(List new features from updated docs that could be leveraged)

If no files changed, report: "All documentation is up to date. No impacts detected."

References

• WORKFLOW.md — Detailed impact analysis steps
• EXAMPLES.md — Example report outputs
• TROUBLESHOOTING.md — Common issues