onboard-our-stack

Two jobs, one skill:

• Broad onboarding — "I'm new, help me understand this project." The reader needs a route through the system, in order.
• Targeted — "explain our scheduler." The reader needs one subsystem, on demand.

Tell them apart from the request: a named subsystem -> targeted; "new", "onboard me", "where do I start", "understand the project" -> broad.

The institutional knowledge — which files are load-bearing, in what order, and the gotchas that live only in people's heads — is curated in .claude/onboard/topics.yaml by a maintainer, ONCE, and committed. A newcomer just asks; they never author it and never change code to make this skill work.

Availability ladder — the "works out of the box" guarantee

Pick the highest tier the repo supports. Never block the newcomer on setup, and never demand maintainer input from someone who came here to learn.

1. Curated config present (.claude/onboard/topics.yaml at repo root) -> use it. Best tier: real ordering, real gotchas. See Broad / Targeted below.

2. No config -> COLD START. Do NOT refuse, and do NOT drop into config authoring (that is a maintainer-only flow, below). Orient the newcomer from the repo's own authoritative sources, in this order if present: README.md, CLAUDE.md / AGENTS.md, ARCHITECTURE.md, docs/ (a product doc and a runbook if they exist), the dependency manifest (pyproject.toml / requirements.txt), and the entry point (main.py / app). Synthesize a grounded orientation, citing each file. Derive getting-started from README/RUNBOOK. Then say plainly: "This is auto-read from your repo's docs, not a curated walk — the tribal knowledge a teammate would warn you about (stale docs, landmines, why it's built this way) isn't captured yet. A maintainer can run the setup, or I can help one author it."

   The line you must not cross: reading and citing the team's own docs is ALLOWED — that surfaces what's written, it is not a guess. Inventing gotchas, or asserting a file is load-bearing without evidence from a doc or the entry point's own imports, is NOT allowed. When unsure, attribute it or omit it.

3. No config and no docs -> minimal. Show the entry point, the dependency manifest, and the top-level tree; say honestly there's little to go on, and suggest a maintainer author .claude/onboard/topics.yaml.

Broad onboarding (curated tier)

Walk onboarding_path in order — it is the curriculum the maintainer chose; don't reorder it.

1. Lead with the "why" (the product/vision topic): what this is and who it's for, before any code.
2. Getting started: read the docs the getting_started topic points at (RUNBOOK/README) so the run/test commands stay current — do not hardcode or guess them.
3. The keystone: request_lifecycle — narrate ONE request end to end across the layers. This single story is what gives the model; everything else is depth.
4. Then the deep topics in path order, each as a short synthesis, not a file dump.
5. Defer per-topic gotchas to their topic — don't open with a barrage of warnings the reader has no model to hold yet. Surface at most one or two global landmines up front (e.g. a known doc-vs-code drift).
6. Close with a concrete first step: a small, safe area for a first change, and which topics to read for it.

Pace it: offer to go one topic at a time rather than dumping all of them.

Targeted (curated tier)

Match the question to one topic by key or one_liner. Read its read_in_order in order; if a path is missing the config is stale — warn, name the file, read the rest, flag the gap. Synthesize the mental model, surface that topic's watch_out_for, cite files, point at the adrs/specs for the why. Orientation, not a line-by-line walk. Offer the nearest adjacent topic next.

Config shape

.claude/onboard/topics.yaml has two top-level keys:

• onboarding_path: ordered list of topic keys — the broad-mode curriculum.
• topics: map of <key> -> { one_liner, read_in_order, watch_out_for, optional adrs }. Two topics are special by convention and belong early in the path: getting_started (points at the run/test docs) and request_lifecycle (the end-to-end story).

See references/topics.example.yaml for the schema and a worked example.

Maintaining (maintainer-only; never blocks a newcomer)

A maintainer authors the config once, grounded in files they verify exist, and commits it. Trigger the authoring flow ONLY when someone explicitly asks to set up or curate onboarding — never as the default response to a missing config. Copy scripts/check_topics.py out of the installed skill into the repo (e.g. ci/check_topics.py) and run it in CI so stale paths fail the build; a stale reading list teaches a wrong model, the one failure this skill exists to prevent.