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Migrate Spec

Transform existing GSD, spec-kit, or BMAD planning artifacts into the bigpowers specs/ model. No code is written — the output is a set of bigpowers-format spec files the user can use immediately.

Quick start

1. Run this skill from the root of the project being migrated (not the bigpowers repo itself).
2. The skill auto-detects the source framework and presents its findings before transforming anything.
3. All output goes to specs/ at the project root.

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Red flags — stop and ask

Before proceeding, check for these rationalization traps:

• Partial artifact set — only one fingerprint file found (e.g. just spec.md with no plan.md). Don't assume it's a complete project. Ask: "I found only X — is this the full set of your spec artifacts?"
• Wrong trigger — user said "migrate my code" or "migrate the database", not "migrate my specs". Confirm before running.
• Stale source — source artifacts have commit dates older than 6 months with no recent activity. Flag: "These specs appear inactive since . Are they still the source of truth?"
• Active divergence — source state.yaml or sprint-status.yaml shows in-progress work. Flag: "There is active work in flight. Migrating now may lose in-progress context. Proceed?"

If any red flag fires: surface it, wait for explicit user confirmation before continuing.

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Process

Step 1 — Detect the source framework

Scan for the fingerprints below. Stop at first match; if multiple match, list them and ask the user which is primary.

Framework	Fingerprints (any one is sufficient)
GSD	.planning/ directory; .planning/ROADMAP.md; .planning/REQUIREMENTS.md with REQ- IDs
spec-kit	.specify/ directory; spec.md + plan.md at root; .github/skills/speckit-*/SKILL.md
BMAD	_bmad/ directory; _bmad-output/ directory; prd.md with FR- IDs; epic-*.md or story-*.md

If none found: ask the user which framework before proceeding.

→ verify: test -d specs && test -f specs/state.yaml

Step 2 — Inventory the source artifacts

List every artifact found matching the detected framework. Present the list to the user:

See REFERENCE.md — Detected: GSD...

→ verify: test -d specs && test -w specs

Step 3 — Transform (one artifact at a time, show diffs)

Apply the mapping from REFERENCE.md and REFERENCE-GSD.md. For each target file:

1. Show what will be created or appended (title + first 20 lines).
2. Ask: "Create this? [yes / edit / skip]"
3. On yes: write to specs/.

ID Tracking (REQ-XX, FR-XX, UJ-XX)

When source artifacts contain IDs (REQ-XX, FR-XX, UJ-XX), emit them as first-class YAML fields in in_scope entries, not YAML comments:

See REFERENCE.md — # CORRECT — first-class id: field...

When source has no IDs: Prompt the user: "No IDs found. Assign auto-generated IDs? [yes / no]". If yes, emit REQ-{NNN} with # auto-generated annotation.

When source has MIXED IDs: Items with IDs get id: fields; items without IDs receive auto-generated REQ-NNN entries. Document which were auto-generated in a comment block at the top of in_scope.

See REFERENCE.md — in_scope format with ID tracking for examples.

Traceability Output (FR-XX, UJ-XX)

When source has FR-XX or UJ-XX IDs, emit specs/product/REQUIREMENTS_TRACE.yaml for end-to-end requirement traceability:

See REFERENCE.md — trace:...

Existing trace file: If REQUIREMENTS_TRACE.yaml already exists, prompt: "REQUIREMENTS_TRACE.yaml exists. [overwrite / merge / skip]"

No FR-XX/UJ-XX found: Skip trace file; add note to state.yaml handoff: "No FR-XX/UJ-XX IDs found — traceability file skipped".

See REFERENCE.md — REQUIREMENTS_TRACE.yaml format for the complete schema.

HARD GATE — Never overwrite an existing specs/ file without explicit user confirmation. Merge into it if it exists; don't clobber.

→ verify: git rev-parse --git-dir >/dev/null 2>&1 && test -d specs

→ verify: test -d specs && [ "$(ls specs/*.md specs/*.yaml 2>/dev/null | wc -l | tr -d " ")" -gt 0 ]

Step 4 — Generate state.yaml

Always regenerate specs/state.yaml from scratch in bigpowers YAML format (see REFERENCE.md for template). The handoff block is mandatory and must include all four fields:

See REFERENCE.md — active_flow: null...

If no open decisions were found during migration, the open_decisions list may be empty with an explanatory comment:

See REFERENCE.md — handoff:...

→ verify: grep -q handoff: specs/state.yaml