/new-spec — scaffold a new version spec

Given <version> (e.g. v0.2.0) and <topic> (e.g. mutating-tool-gate), create a new per-version spec, its paired ADR (design research), and the index entry in one shot.

Outputs

1. docs/roadmap/<version>/<topic>.md — the spec body (frontmatter status: Draft, version: <version>)
2. docs/design/<version>/<topic>-research.md — the paired ADR (same frontmatter)
3. docs/roadmap/README.md — append a row to the active spec index table

Procedure

When this skill is invoked, execute the following steps in order:

1. Validate arguments

• version must match the SemVer pattern vX.Y.Z
• topic must be kebab-case ([a-z0-9]+(-[a-z0-9]+)*)
• Abort if docs/roadmap/<version>/<topic>.md already exists — never overwrite an existing spec

1. Read the four files which are the SSOT for body structure:

• templates/spec.md — spec body skeleton (placeholders only, copied directly)
• templates/adr.md — ADR skeleton (placeholders only, copied directly)
• references/spec.md — per-section rules for the spec body (single-phrase title, intro = core summary without scattered detail, behavior-driven AC-N, etc.)
• references/adr.md — per-section rules for the ADR (standard intro phrase, four subsections (### Facts / ### Validator Counter-Arguments / ### Final Decision / ### Primary Sources))

Also re-read docs/CONVENTIONS.md for cross-cutting policy: § Status Metadata (frontmatter schema), § Section Role Separation (info routing lookup), § Cross-Link Direction Rules, § Naming Rules, § Acceptance Criteria Format. Conventions are Living and may have evolved since the last skill invocation.

1. Create directories if missing:

• docs/roadmap/<version>/
• docs/design/<version>/

1. Write `docs/roadmap/<version>/<topic>.md` by copying templates/spec.md verbatim and substituting placeholders (<version> / <topic> / <topic phrase> / intro prose / Decisions table entries / AC bullets / Non-Goals bullets). Apply the references/spec.md per-section rules — especially the intro rule (no detail, defer to Decisions table cells), which is the most-violated rule.

1. Write `docs/design/<version>/<topic>-research.md` by copying templates/adr.md verbatim and substituting placeholders. Apply the references/adr.md per-section rules — especially the standard intro phrase (exact wording + no meta narrative) and the fixed four-subsection order.

1. Append a row to `docs/roadmap/README.md` in the active spec index table (find the ## Active spec index section, add at the end of the table):

   | <version> (<topic>) | Draft | [<version>/<topic>.md](<version>/<topic>.md) | [design/<version>/<topic>-research.md](../design/<version>/<topic>-research.md) |

1. Run the integrity check: uv run --no-project --with "typer>=0.12" python scripts/lint_docs.py docs/. If violations are reported, surface them to the user and propose corrections — do not silently fix.

1. Spawn a fresh-context architect-reviewer subagent for independent review (author ≠ reviewer principle). Use the Agent tool with subagent_type: "architect-reviewer" and a self-contained prompt that includes:

• Project context (hatchet-mcp, spec-driven release model, docs/CONVENTIONS.md SSOT)
• The exact paths of the new spec body, paired ADR, and the README index row
• Cross-check sources to read (docs/CONVENTIONS.md for convention compliance, primary code/files relevant to the spec's technical claims)
• Explicit ask: P0/P1/P2 findings with file:line citations covering — (a) internal consistency (decisions ↔ ACs ↔ ADR matrix), (b) convention compliance, (c) technical accuracy of upstream/code claims, (d) logical gaps / unstated assumptions, (e) scope discipline (anything in the spec that's actually a future version's work, anything in non-goals that's actually in scope)
• Output verdict: APPROVE / REQUEST CHANGES / REJECT
• Length cap (~600 words)

Surface findings verbatim to the user. Do not silently apply fixes — the user reviews the findings and decides which to address. The false-positive rate is non-zero (~30% in practice); the user is the final arbiter. After fixes, re-run lint (step 7) and re-run review (step 8) only if the user requests a second pass — don't auto-loop.

Rules (must comply with docs/CONVENTIONS.md)

This section is a quick reference only — the authoritative SSOT is docs/CONVENTIONS.md. If a re-quoted rule here drifts from the SSOT, the SSOT wins.

• Frontmatter schema (§ Status Metadata): status enum / version SemVer (required for Draft/GA/Superseded) / released YYYY-MM-DD (required for GA/Superseded) / last_updated YYYY-MM-DD / description quoting (double quotes + single quotes for inline identifiers)
• Body structure SSOT (§ Spec / ADR Body Structure): the step 4 / 5 skeletons are structure only; the content rules are owned by the CONVENTIONS §
• Info routing (§ Section Role Separation): details go in Decisions table cells not the intro, option comparison goes in ADR §N four subsections
• Cross-link direction (§ Cross-Link Direction Rules): only the pair may link spec ↔ spec directly. Other spec ↔ spec direct links are forbidden — route through README
• Naming (§ Naming Rules): kebab-case filenames, vX.Y.Z directories, no ./ prefix, fully-qualified URLs for external resources only

Limits

• The step 4 / 5 skeletons are structural — actual decisions / acceptance criteria / non-goals / decision matrix entries must be filled per CONVENTIONS § Spec / ADR Body Structure (not by mimicking recent specs)
• This skill automates structural consistency (frontmatter / pair / index / skeleton, steps 1–7) and delegates independent review (step 8) — but content judgment, accept/reject of reviewer findings, and any fix application remain the user's call. The reviewer's false-positive rate is non-zero; never blindly accept.
• The auto-spawned review (step 8) is intentional for new spec creation (high-stakes, low-frequency, immutable-after-GA). Other skills (commit-message / docstring-edit / etc.) should NOT copy this pattern by default — the verifier-spawn cost is justified only when the miss-cost outweighs the invocation overhead.