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add-tool

Scaffold a new Forge tool — implementation, registration, permission/risk metadata, sandbox routing, and a unit test. Use when adding anything to src/tools/.

The English summary is being prepared. Showing the original description.

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SKILL.md (original)

Review the instructions the agent will receive before you install.

add-tool

Four places change. Do all four or the tool is half-registered.

  1. src/tools/<name>.ts — the tool module.

    • zod schemas for input and output.
    • Declare sideEffect (none|read|write|network|exec) and risk (low|medium|high|critical). Be honest — these drive permission prompts and auto-approval.
    • All filesystem access via src/sandbox/fs.ts helpers.
    • All shell commands via src/sandbox/shell.ts + classifyCommandRisk.
    • Request permission via requestPermission (src/permissions/manager.ts) before the side effect.
    • Return { ok, data } / { ok: false, error }. Throw only for programmer errors, using ForgeRuntimeError.
  2. Registration — wire into the registry following the pattern in an existing tool like src/tools/read-file.ts.

  3. test/unit/<name>.test.ts — at minimum:

    • happy path,
    • zod rejection on invalid input,
    • permission denied → structured error (not throw),
    • path-escape refused by sandbox,
    • (if shell) critical command hard-blocked.

    Use vi.mock for the permission manager and sandbox boundaries.

  4. Docs — if user-visible, update the tools table in docs/ARCHITECTURE.md and the README "At a glance" count.

Finish with the verify skill.

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