Durable Docs Update

Make two judgments in order:

Callers invoke this skill inline, never as a leaf subagent.

Input

Resolve scope through one mode:

Never derive scope from git status; the working tree is process-global. Mode C uses only the caller's named files.

Optional inputs:

• discoveries — the caller's Discovery: bullets, already reduced to gotchas or couplings.
• context — the work's goal and criteria.
• spec — the work's spec.md; Step 2 mines its locked D-NNN-XX decisions.

Protocol

Step 1 — Resolve scope and scale

Resolve the mode, build the in-scope changed-file list, and count each file once. Use the count to cap both discovery and application subagents:

Use fewer subagents when files are tightly coupled. Group files by nearest parent AGENTS.md, and assign each scoped file to exactly one discovery subagent. With no scoped files, continue to the Step 5 no-op report.

• Brief. Give each discovery subagent its files, scoped diff or current content, matching discoveries, locked decisions, and work context.
• Git safety. Scope every subagent's Git reads and mutations to its assigned files. Never let a subagent run git stash, git checkout -- ., git reset, or another whole-tree mutation.
• Discovery boundary. Discovery subagents make no mutations.
• Baselines. Read committed baselines with git show HEAD:<path>.

Step 2 — Discover, judge, and place

Each discovery subagent invokes the Skill tool to load vet-fact and place-fact, then scans its assigned files and directly related guidance. Read a changed code file in full only when it contains a candidate comment; never read the whole repository.

A full-file read does not expand scope. Consider only comments in or governing changed code, or comments named by a passed discovery or decision. Leave unrelated comments—including test separators and historical notes—untouched unless the caller explicitly expands scope.

Inspect only related sources:

• The file's comments, ancestor AGENTS.md files, and Claude path rules in .claude/rules/ whose quoted paths: globs match the file.
• A root-routed task document only when the change purpose matches its route.
• Any target selected by place-fact; crossing modules does not choose a document by itself.

• Gather. Gather candidates from comments, passed Discovery: bullets, locked spec decisions that constrain an in-scope file, and existing guidance that directly names affected behavior.
• Merge. Merge a discovery with the decision it restates and keep the decision's rationale wording.
• Exclude. Exclude active-state documents, dated investigations, session logs, handoffs, process/workflow documents, .agents/skills/, .claude/skills/, .claude/commands/, and unrelated material.

For every candidate, apply WORTH before PLACE:

1. Use vet-fact to decide whether the fact should survive. A comment that contradicts current code becomes an UPDATE; a comment that fails WORTH becomes a DELETE.
2. Use place-fact over every surviving fact to select its canonical owner and delivery boundary.
3. Classify the proposed change: ADD a missing fact; UPDATE a stale or unclear fact; TRIM history or bloat while keeping the fact; DELETE a fact that no longer belongs; or MOVE a fact to its canonical owner. Preserve any valid Discovered: freshness stamp on a TRIM.
4. Score confidence 0.00–1.00 that the fact, action, and target are all correct.

Keep a D-NNN-XX or AC-NNN-XX id beside the fact it labels. Cut task ids, wave numbers, and F-NNN-XX finding ids while keeping any fact they obscure. Return proposals as { source: file:line | input, currenttext, fact, action, target, proposedchange, confidence }; return no file contents beyond a candidate's current text and make no edits.

Step 3 — Merge, gate, and assign

The main agent merges discovery results, deduplicates by fact and canonical target, and keeps the highest-confidence copy. Resolve conflicting placements before assignment.

• Gate. Accept every proposal with confidence ≥ 0.75; drop every proposal below it without asking, regardless of source or action.
• Report retention. Keep dropped comment proposals only for the Step 5 left alone, unsure report.
• Triage. Skip triage because all accepted edits are scoped and reversible.

Group accepted proposals by target file within the Step 1 subagent cap. Assign each target file to exactly one application subagent, and assign both sides of a MOVE to the same subagent. If none qualify, continue to Step 5.

Step 4 — Apply, shape, and check coherence

Pass each application subagent its accepted proposals verbatim and the Step 1 Git-safety rules. Each subagent:

1. Applies all assigned proposals before shaping their text.
2. For every instruction document created or materially reshaped, invokes the compress-file skill via the Skill tool. A document is materially reshaped when the changes add, remove, or move a section, or span at least three sections.
3. Invokes the tighten-instruction skill, then the structure-prose skill, via the Skill tool over only the comments and instructions this run changed.
4. Scores every independent lens edit 0.00–1.00, applies it at c ≥ 0.75, and holds it below the threshold.
5. Returns one line per file, a comment tally (corrected, deleted, tightened), and deleted-comment details as { file, line, text, confidence }.

After all application subagents return, the main agent:

1. Counts each changed durable document once. With none, skips the coherence subagents; otherwise, applies the Step 1 tiers to cap them.
2. Groups related documents across new coherence subagents within the resulting cap and assigns each document to exactly one subagent.
3. Passes every coherence subagent the Step 1 Git-safety rules.

Each coherence subagent invokes the check-coherence skill via the Skill tool separately on every assigned document.

After all coherence subagents return, the main agent confirms that the final combined diff applies every accepted proposal and contains no unrelated changes.

Step 5 — Report

The caller does not repeat this report.

**Docs sync:**
- Comments: [n] corrected, [m] deleted, [k] tightened
  - deleted: [file:line — "text" (0.NN), one per line | none]
  - left alone, unsure: [file:line — "text" (0.NN), one per line | none]
- Docs: [file — what changed, one per line | none needed]
- Dropped: [K] candidates below 0.75
- Instruction delta: [net lines], [artifacts added], [artifacts removed], [always-loaded lines]; review signal only, never a quota