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Add guidance to SKILL.md on when building a graph is (and isn't) worth it

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调研方向

找到 graphify 技能的 SKILL.md,并阅读现有的构建步骤。在这些步骤前添加一个简短章节,结合 issue 中的案例和指导,说明何时使用直接搜索,何时构建或查询图。章节涵盖现有图、一次性查询,以及构建图能带来收益的情况后,即为完成。

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描述

Ran the skill end-to-end today (sample corpus + a real ~200-file project) and it delivered genuinely good results — correct AST extraction, accurate cross-referencing between code and doc semantic layers, and the cohesion/god-node/surprising-connections analysis surfaced real findings (an architectural smell, a cross-doc duplicate derivation, etc.).

One gap: the skill has no guidance on when the full pipeline is worth its cost vs. when a plain code search would do. In practice:

  • A single targeted lookup ("what calls X", "where is Y defined") on an ordinary-sized codebase is answered just as well, instantly and for free, by grep/ripgrep/Read. Building the graph first is pure overhead for that case — AST extraction is fast and free, but semantic extraction on docs dispatches subagents and can take minutes and tens of thousands of tokens, even for a modest doc set.
  • The graph earns its cost when: there will be many repeated questions (amortized build cost), the corpus is large/unfamiliar and the user needs orientation, the question needs cross-file/cross-type links text search can't see (doc ↔ code, cross-doc semantic duplicates), or the question is structural (cohesion, bridging nodes, import cycles) rather than textual.

Right now the skill (reasonably) defaults to building on /graphify <path>, which is fine when the user explicitly asks for that — but when an agent is deciding on its own whether to reach for graphify vs. a direct search for a one-off question, there's no steering in SKILL.md toward the cheaper option first.

Suggested addition: a short "is a graph worth it here" section before the build steps, something like:

Building costs real time and tokens: AST extraction on code is free and fast, but semantic extraction on docs/papers/images dispatches subagents (minutes, tens of thousands of tokens), and a full pipeline run is overhead you pay once per corpus state. Don't pay it reflexively.

If graphify-out/graph.json already exists for this corpus, always query it rather than re-deriving the answer by reading files or rebuilding — that cost is already sunk and querying is cheap.

If no graph exists yet, check whether the request is a single, targeted lookup a plain code search would answer just as well — "where is X defined", "what calls Y", "find the function that does Z" on a codebase of ordinary size. For these, grep/ripgrep/Read is faster, free, and exact. Say so and just search directly; offer to build the full graph instead only if the user wants it.

Building (or updating) the graph earns its cost when:

  • You expect many future questions against this corpus — the build cost amortizes.
  • The corpus is large or unfamiliar and the user needs orientation (god nodes, communities).
  • The question needs cross-file or cross-type connections text search can't see.
  • The question is structural/architectural, not textual.

Happy to turn this into a PR against SKILL.md if that's useful.

Separately filed one small fix noticed during testing as a PR: #4830 (graphify query --help ran a literal query instead of showing usage). The other thing I initially flagged (hyperedge members/nodes field mismatch) turned out to already be intentionally handled in build.py (#1561) — not a bug, so no PR for that one.

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环境准备

这个项目没有提供开发容器、Dockerfile 或贡献指南,环境需要你自己搭建:先看它的 README,通用步骤见我们的新手贡献指南。

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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