sdlc/skills/analyze/SKILL.md

---
name: analyze
description: SDLC analysis stage. Gate on capability tags enforced in code by sdlc-gate (analyze requires reasoning-max), confirm the source branch, then pick a plan from PLAN_CONTENTS and question until consensus per references/consensus.md. Analyze its user stories against the current state (working directory plus REPO_{HASH} inventory for reuse), then run WBS with a standalone delivery/handover WP-01, CPM estimates and TDD todos. Write wiki page ANALYZE_{HASH} with real sample data; logic only - never write code or modify files. Use after planning and before implementation; not for writing code (that is implement), and not before a plan exists in PLAN_CONTENTS.
---

# analyze

Goal: create or extend the wiki analysis page `ANALYZE_{HASH}`.
This skill is a **logic-only** stage: never output code, and **never modify any file**.

`{HASH}` = the shared wiki hash for `{owner}/{repo}` used to build the `ANALYZE_{HASH}` page name, computed by `jsc-gitea/tools/hash-id` (see `jsc-gitea:wiki`).
All wiki reads and writes go through `jsc-gitea:wiki`.

## Steps

1. **Model gate and stage lock** — run `jsc-cli/tools/model-tags.sh sync`, then `jsc-hooks/hooks/sdlc-gate.sh lock analyze`. This stage requires the `reasoning-max` capability tag. Rules: `references/model-gate.md`. Completion condition: the script exited 0, and you have reported the stage, the required tag, the actual model id it read from the transcript, and the verdict.
2. **Confirm the source branch** — the branch whose code counts as the current state:
   1. Run `git fetch --prune origin` first — without it, every `origin/...` reference is stale cache. Then report the working directory's current branch, the **remote** branches available (`git branch -r`; never `git branch`) and whether the working tree is clean.
   2. Ask per `jsc-ask:ask` rules which branch the analysis reads from; state the impact scope on every option (analysing the wrong branch produces work packages for code that does not exist).
   3. **The current state is always the remote branch `origin/{source-branch}`, never the local one.** The working directory's HEAD must point at the same commit as `origin/{source-branch}`; behind, ahead or diverged all mean you would be analysing code that is not what the remote holds. Report the gap (`git rev-list --left-right --count origin/{source-branch}...HEAD`) and stop — this stage never switches branches, never stashes, never pulls and never touches the working tree. Rules in `references/branch.md`.
   4. Record the confirmed branch and the head sha **of `origin/{source-branch}`** on the analysis page. Completion condition: the user has confirmed the branch explicitly; never infer it from the current checkout alone.
3. Read `PLAN_CONTENTS` via `jsc-gitea:wiki` for plans whose status is the literal 「未分析」 (name and HASH), and read `ANALYZE_CONTENTS` for existing analyses. Completion condition: you have listed every 未分析 plan with its name and HASH plus every existing analysis, or reported that a list is empty.
4. Let the user choose per `jsc-ask:ask` rules: **extend an existing analysis** or **analyze a new plan**. State the impact scope on every option. Completion condition: the user has picked one option explicitly, and you have named the target — the existing `ANALYZE_{HASH}` page, or the plan the new analysis covers.
5. Analyze the plan page's user stories one by one against the **current state**, **questioning until consensus** per `references/consensus.md` (the single authority for both planning and analysis): every answer produces the next question, and consensus needs both no output-changing unknown **and** the user's explicit confirmation. Never assume a missing detail, and never start the WBS while any item is still open. Current state means:
   1. Every file in the working directory, at the commit `origin/{source-branch}` points to (verified in step 2).
   2. **Reuse an existing method or endpoint unless its logic cannot satisfy the requirement**:
      - Check the `REPO_{HASH}` inventory page first. Re-inventory when the feature or endpoint is missing, or when the recorded commit sha differs from the current one.
      - Re-inventory **MUST run as a sub agent**: analyze the repository's features and endpoints, attach the current commit sha, write back to `REPO_{HASH}` with `templates/repo-page.md`, and update `REPO_CONTENTS` per `templates/repo-contents.md`.
      - For each reuse candidate, confirm the file path and method name first, then analyze whether its logic fits the requirement. Reject a candidate only for a stated reason, and record both the candidate and that reason in the analysis page's 複用決策 field.

   Completion condition: every user story has reached consensus under both conditions of `references/consensus.md`, and every reuse decision — reused, or rejected with its reason — is recorded in 複用決策.
6. Run a **Work Breakdown Structure (WBS)**: split the user stories into work packages, number them sequentially (`WP-01`, `WP-02`, ...) and mark dependencies. Completion condition: every user story on the plan page maps to at least one numbered work package, and every dependency edge is recorded in the WBS table's 相依 column.
7. **`WP-01` is always the delivery/handover work package** — see "Delivery package is WP-01" below. It stands alone, never merged into an implementation package, and every implementation package that consumes its spec depends on it. Completion condition: `WP-01` is marked 交付 `是` and holds only spec-shaped items, and every implementation package that consumes its spec names `WP-01` in its 相依 column — or the no-handover case below is confirmed with the user and its reason is written on the page.
8. Estimate every work package's effort in hours and days with the **Critical Path Method (CPM)**, and mark the critical path. Completion condition: every work package carries an hours figure and a days figure, and the critical path plus its total days are written on the page.
9. Split every work package into todos with **Test-Driven Development (TDD)**, formatted `[ ]` (open) / `[x]` (done). Each todo is one vertical slice: one seam, one test, one minimal implementation. Seams and anti-patterns: `references/tdd.md`. Completion condition: every work package carries at least one `[ ]` todo, and every todo names its seam and the behaviour its test asserts.
10. Apply `templates/analyze-page.md` to create or update the analysis page and write it back via `jsc-gitea:wiki`. The page content is Traditional Chinese, exactly as the template dictates. Completion condition: the page is saved on the wiki and carries every section the template dictates, including the source branch, the head sha and the 未決項 section (「無」 when there is none).
11. If the analysis page is new: add it to `ANALYZE_CONTENTS` per `templates/analyze-contents.md`, and flip the plan's status in `PLAN_CONTENTS` to the literal 「已分析」. Completion condition: `ANALYZE_CONTENTS` shows the new row and `PLAN_CONTENTS` shows the literal 「已分析」, both saved on the wiki.

## Delivery package is WP-01

A work package is a **delivery/handover package** when someone else — another person, another CLI, another team — has to act on its output. Interfaces, schemas, spec documents, acceptance criteria and sample payloads are delivery output; endpoint bodies and UI wiring are not.

- **`WP-01` is the delivery/handover package, always first, always standalone.** Pull every spec-shaped item out of the implementation packages and put it here. Never merge a spec into the package that implements it — merging removes the ability to hand the spec over early, which is the whole point.
- **Implementation packages depend on `WP-01`** when they consume its spec, and they are the backup queue: still numbered, still estimated, still on the page, just ranked after it.
- Mark every work package as 交付 `是` / `否` in the WBS table, and record `WP-01`'s intended content type in the 交付型別 column when the user has already decided it (options in `references/deliver-formats.md`; the type is confirmed for real when `implement` starts that package).
- Dependencies still win among the rest: never place a package before one it depends on. Within the same dependency level, delivery-shaped packages come first.
- **When nothing is genuinely deliverable** (say, an internal refactor with no interface change), do not invent an empty `WP-01`: confirm with the user per `jsc-ask:ask` that this analysis has no handover output, then note the reason on the page and number the implementation packages from `WP-01`.

## Sample data

Every sample value on the analysis page — request and response payloads, field values, config snippets, test fixtures — follows `references/deliver-formats.md`, which owns the source order, the labelling and the API-document layout. Record each value's origin in the WBS table's 資料來源 column. Completion condition: every sample value on the page carries a 資料來源 label of either 「真實：{source}」 or 「推論：無來源」, and no sample value contains personal data.

## Hard limits

- Never output a code snippet (file paths and method names are allowed).
- Never modify any file in the working directory.
- Never switch, create or clean branches in this stage; ask the user to do it.