feat(setup): report an unwritable target as a structured error (task 0044)
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Both halves of `setup` assumed the files they manage are writable. A
declaratively managed target — read-only because a configuration manager
owns it, because a file is flagged immutable, or because the path is
root-owned — made the skill install raise a raw filesystem exception and
the hook install surface the underlying message with no guidance.

Both now fail with `TARGET_NOT_WRITABLE`, naming the file and pointing at
the general remedy: it appears to be managed by another tool, so declare
the skill or hook through that configuration instead. The error names no
particular manager, because read-only is not diagnostic of one.

A target already byte-identical to the bundled copy still succeeds —
nothing needs writing, so its being read-only is beside the point.
This commit was merged in pull request #53.
This commit is contained in:
2026-07-20 13:25:03 -04:00
parent 27aad04984
commit a1e68dc530
5 changed files with 283 additions and 23 deletions

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@@ -491,7 +491,7 @@ The dashboard's empty states are `prs: 0 open` / `issues: 0 open` (raw strings,
Empty output is never silent.
**Principle 6 — Structured errors, exit codes, idempotent mutations, no prompts.**
Errors are represented as a typed `AxiError` with one of ten named codes: `REPO_NOT_FOUND`, `ISSUE_NOT_FOUND`, `PR_NOT_FOUND`, `AUTH_REQUIRED`, `FORBIDDEN`, `RATE_LIMITED`, `TEA_NOT_INSTALLED`, `VALIDATION_ERROR`, `GIT_ERROR`, `UNKNOWN`.
Errors are represented as a typed `AxiError` with one of eleven named codes: `REPO_NOT_FOUND`, `ISSUE_NOT_FOUND`, `PR_NOT_FOUND`, `AUTH_REQUIRED`, `FORBIDDEN`, `RATE_LIMITED`, `TEA_NOT_INSTALLED`, `VALIDATION_ERROR`, `GIT_ERROR`, `TARGET_NOT_WRITABLE`, `UNKNOWN`.
The `ISSUE_NOT_FOUND`/`PR_NOT_FOUND` split (vs gh-axi's single `NOT_FOUND`) is a deliberate divergence enabled by path-based 404 classification.
API error responses are classified by HTTP status code and calling context:
@@ -516,6 +516,8 @@ tea has logins but none match the detected hostname → `REPO_NOT_FOUND` (the re
HTTP 401 from the API → `AUTH_REQUIRED` (token invalid or revoked), per the status table.
A `--login` value naming a nonexistent profile is `VALIDATION_ERROR`, listing the available profile names.
`GIT_ERROR` classifies non-zero git subprocess exits (currently only `pr checkout`), carrying git's first stderr line.
`TARGET_NOT_WRITABLE` classifies a `setup` target the filesystem refuses (`EACCES`, `EPERM`, `EROFS`), naming the file and pointing at the general remedy: it appears to be managed by another tool, so the skill or hook belongs in that tool's configuration.
It never names or infers a particular configuration manager — read-only is not diagnostic of one.
Error output is TOON-encoded to stdout (not stderr): `error: <message>`, `code: <CODE>`, and optionally `help[N]:` with suggestion lines.
The suggestions field is named `help`, not `hint`.
Exit codes: 0 success, 1 error, 2 for `VALIDATION_ERROR` — covering unknown flags, missing required inputs, and server-side 422 rejections alike (the `axi-sdk-js` `exitCodeForError` mapping; see ADR 0004).