Spec advisor — choose and set up a spec-driven development system

When a software project has no spec-driven development (SDD) system, this skill helps the user choose a fitting one and delegates setup to that system's own installer. It never authors specs, PRDs, or ADRs — the installed system owns its workflow. The skill advises; it writes nothing of its own except by running the chosen system's installer, and only after explicit approval.

It is offline-first. Everything needed to scan, recommend, and name an install command is in the curated reference and the shared detection signatures; the network is reached only with the user's say-so (see the online policy in references/spec-systems.md).

What this skill is not — and which skill to use instead

The "no duplication" boundary is the point of this skill, so it is worth stating as hard limits. This skill does not:

A spec system is a project process, not a role-tool that agents call — so it is also kept out of the harness tools.md registry. If the request is to build or change the agent harness, that is harness-setup; if it is to assess one, that is harness-review. This skill is only about the project's spec/planning process.

The flow

Run these in order. Each gate is an off-ramp: the skill is advisory, not coercive, so a "no" anywhere ends the run cleanly.

Step 0 — Scope check: is this a software project?

SDD systems are for building software. Confirm the project is software before going further — look for a manifest or source: package.json, pyproject.toml, go.mod, Cargo.toml, pom.xml, a *.csproj, Gemfile, and the like. If the project is not software (docs, content, data, ops config with no codebase), explain briefly that an SDD system is not the right tool and stop. Recommending one here would be pushing a process the project has no use for.

Step 1 — Scan first: is a spec system already present?

Using ${CLAUDE_PLUGIN_ROOT}/shared/detection-signatures.md, scan for any existing spec system or ADR registry. If one is found, report what is present and where, then stop. Do not push a second system on top of one already in use — an existing process is the user's decision, and stacking a second SDD system creates exactly the duplication this skill exists to avoid. This is a read-only report; the scan writes nothing. The disambiguation rules (the shared requirements/design/tasks triple resolved by parent directory; BMAD v4 vs v6; ADR signals) are in that reference — apply them before concluding.

Step 2 — Opt-in gate: offer a recommendation

If no system is found, offer to recommend one. This is the opt-in gate: a "no" ends the run cleanly. Offering is the default; nothing past this point happens without the user's yes.

Step 3 — Profile for fit

A good recommendation depends on the project's shape, so gather a few quick signals — by asking, or by inferring from what Step 0 already saw:

• Greenfield or brownfield — a fresh repo tolerates a heavier pipeline; an existing codebase usually wants lighter, change-scoped specs.
• Solo or team — team workflows benefit from approval steps and named roles; a solo dev rarely wants the ceremony.
• Process appetite — anywhere from lightweight decision records (ADRs) to a full agile pipeline with personas.
• Agent or IDE already in use — an IDE/AWS commitment points one way (Kiro); a Claude Code-centric flow points another.

Step 4 — Recommend (offline)

From the curated shortlist and the selection decision tree in references/spec-systems.md, present 2–3 best-fit candidates with rationale — not a single verdict. Before finalizing, offer the opt-in discovery search (a broad "is there anything newer than the shortlist?" web search); run it only on an explicit yes, and if it stalls or the environment is offline, fall back silently to the curated data. Then the user picks one explicitly. Do not choose on their behalf.

Step 5 — Delegate setup

For the selected system:

1. Optionally fetch current setup details from that system's official repository (the URL in its profile) — install command and docs. This is the authoritative fetch (online form b), a precise pull from the canonical source, not a broad search. Skip it offline and use the curated install command.
2. Present the install command and get explicit approval before executing it. An install is an exec-and-write — it changes the user's repo and environment — so it is gated exactly like harness-setup's change manifest. State the command, what it will create, and where.
3. Run or guide the system's own installer. Then confirm what was created and where.
4. Never author specs. Once the system is installed, its own workflow takes over. The skill's job ends at a working, confirmed install.

IDE special case — AWS Kiro. Kiro is an IDE, not a repo package. A skill cannot install an IDE into a repository, so for Kiro this is detect-and-advise only: explain what it is, point the user at the official source (kiro.dev), and stop. Do not run an installer or hand-scaffold .kiro/. The Kiro caveat in references/spec-systems.md has the detail.

Error handling and graceful degradation

• Offline, or a search stalls — fall back to the curated data; never block on the network. The offline path is complete on its own.
• Detection ambiguity — resolve the shared requirements/design/tasks triple by parent directory first (per ${CLAUDE_PLUGIN_ROOT}/shared/detection-signatures.md); if still ambiguous, report exactly what was found and ask, rather than guessing the system.
• Installer failure — apply the failure contract:
  1. Report plainly — the command run, the error, and the system's official troubleshooting source. Do not partially hand-roll the setup; a half-installed system is worse than a clean failure the user can retry.
  2. Record nothing — a failed install leaves no coordination context; the project still counts as having no spec system.
  3. Leave a clean retry path — name any artifacts the failed installer left behind so the user can remove them and retry; do not delete them without the user's say-so.
  4. Tell the caller — when invoked from harness-setup, state the outcome explicitly: "install failed — proceed as if no system is present," so nothing downstream assumes the system exists.
• User declines at any gate — stop cleanly. The skill is advisory; an off-ramp taken is a valid outcome, not a failure.

References

• ${CLAUDE_PLUGIN_ROOT}/shared/detection-signatures.md — the scan-first knowledge: the consolidated path→system table and the disambiguation rules (triple-by-parent-dir, BMAD v4/v6, ADR signals). Shared with harness-setup, which reads it to detect an installed system.
• references/spec-systems.md — the per-system profiles (official repo/docs URL, install command, philosophy, Claude Code affinity, maturity, best-fit), the selection decision tree, the Kiro/IDE caveat, and the online policy.