docs-digest

Produce one agent-only primer that lets a fresh agent understand this repo's documented domain without reading docs/ end to end.

GRAPH_REPORT.md answers what connects to what. This answers what this project means. They are siblings, both under .claude/graph/.

Inputs: docs/** and openspec/specs/**, via the deterministic index. Output: .claude/graph/DOCS_DIGEST.md, overwritten in place. Never indexed: openspec/changes/**. Active change artifacts are read directly, not digested.

Run this when: the digest is missing or stale, docs or living specs changed substantially, or the user asks to rebuild it. Do not run it per query — interactive skills should read an existing fresh digest, not regenerate one.

Execution

1. Index (deterministic — no model judgement)

interlock-graph docs-index . --write

Writes .claude/graph/docs-index.json covering docs/ and openspec/specs/, with a sha256 and heading spans per file.

If the index is empty, stop and report that: a repo with no docs/ and no openspec/specs/ has nothing to digest, and inventing one is worse than having none.

2. Staleness check

If .claude/graph/DOCS_DIGEST.md exists, compare its frontmatter source_hashes against each files[].sha256 in the index. All match, and the user didn't force a refresh? Report fresh and stop.

Rebuild when: hashes mismatch, the digest is missing, or the user says rebuild / refresh / force.

3. Selective read — never concatenate the corpus

Read .claude/graph/docs-index.json in full. It is an inventory, not the corpus.

Then read section spans only (offset/limit from each entry's startLine/endLine), highest signal first. Rank the index entries yourself using these signals, in order:

1. Entry points. A file whose path or title matches readme, architecture, overview, getting-started, contributing, or adr — these state intent and structure.
2. Inbound references. Files linked to most often from other indexed files. The index records outbound links; invert them. A doc everything points at is load-bearing.
3. Spec coverage. Every openspec/specs/*/spec.md capability gets at least its title and requirement blurbs — the capability map is the single most useful thing in the digest.
4. Breadth over depth. Prefer one section from each of ten documents over ten sections from one. You are building a map, not a summary.

Drop first under token pressure: long analysis or research write-ups, changelogs, meeting notes, anything whose blurb already conveys the point, and peripheral spec capabilities. For those, use the index blurb instead of reading a span.

Rank what the repo actually contains. Do not assume any particular filename exists.

Forbidden: find docs -exec cat, reading every docs/**/*.md or openspec/specs/**/*.md end to end, reading anything under openspec/changes/, and writing output anywhere under docs/ or openspec/.

4. Write the digest

Overwrite .claude/graph/DOCS_DIGEST.md with exactly this contract:

---
audience: agent-only
target_tokens: 2500
generated_at: <ISO-8601>
source_hashes:
  <path>: <sha256>
  # one entry per indexed file
---
# docs-digest
## map
- <short-key> → <path>
## facts
- <dense telegraphic facts; ;-joined clauses fine>
## workflows
- <agent-relevant workflows and constraints>
## specs
- <capability> → key requirements / constraints (telegraphic, pointer-heavy)
## pointers
- <path>#<heading> Lstart-Lend

Omit ## specs entirely when the index contains no openspec/specs/ files.

Style — this is read by agents, not people. Telegraphic. Abbreviations fine. Lists and →. No tutorial tone, no narrative padding, no worked examples. Prefer a pointer over a paraphrase whenever the reader could drill down with interlock-graph context or a Read span.

Budgets: soft cap ~2500 tokens (ceil(chars/4)), hard stop ~3200. Drop lowest-priority content first. Never state a fact that isn't in the index or a span you actually read.

5. Report (≤10 lines)

Output path, token estimate, file count split by docs/ vs openspec/specs/, fresh-vs-rebuilt, and a reminder that humans should keep reading docs/ — this artifact is not for them.

Relation to the graph skill

Follow ${CLAUDE_PLUGIN_ROOT}/shared/TOOL-ECONOMY.md.