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name spec-forge-implement
description Use when you need to execute an approved implementation spec, record what changed, capture validations, and track whether any blockers still prevent completion.

Spec Forge Implement

Use this stage after readiness passes to perform the implementation work and record its outcome in the per-spec implementation report.

This stage answers: what changed, whether implementation is complete, which validations ran, and whether any blockers remain.

Shared Operating Rules

  • This skill runs only in Plan mode. If the runtime is not Plan mode, stop and tell the user to switch before continuing.
  • Confirm both chat language and file language before implementation work or implementation-report updates.
  • Keep decisions and status updates in chat. YAML remains the persisted source of truth, but the user should not need to inspect files directly.
  • Report implementation progress and completion from chat summaries rather than file review.

Required Shared CLI Commands

  • spec-forge-cli resolve
  • spec-forge-cli artifact get
  • spec-forge-cli artifact put
  • spec-forge-cli artifact merge
  • spec-forge-cli gate check
  • spec-forge-cli stage advance

Required UX Contract

Read ../spec-forge/assets/contracts/ux-contracts.yaml before collecting parameters.

At the start of the stage, run:

spec-forge-cli resolve --target <target-dir> --skill spec-forge-implement --stage implement --write

If the runtime is not Plan mode, stop and ask the user to switch before continuing.

Use chat summaries as the progress surface; the implement stage still closes on the persisted report plus gate evaluation rather than a new approval gate.

Entry Gate

# Check Source
1 Readiness gate passed Readiness stage
2 Final implementation spec is approved Readiness stage

Required Inputs

  • Approved synthesis/implementation-spec.yaml
  • Passed gates/readiness.yaml

Workflow

  1. Resolve invocation UX first with: spec-forge-cli resolve --target <target-dir> --skill spec-forge-implement --stage implement --write Confirm chat language and file language before implementation work begins.
  2. Perform the implementation work against the target codebase.
  3. Update .spec-forge/specs/<spec-id>/synthesis/implementation-report.yaml. Prefer spec-forge-cli artifact merge --file synthesis/implementation-report.yaml for progressive updates during implementation and spec-forge-cli artifact put --file synthesis/implementation-report.yaml when writing the final report payload in one pass.
  4. Record at least:
    • whether implementation is completed
    • a short summary of changes
    • changed files
    • validations that ran and their status
    • any remaining blockers
  5. Keep blockers explicit. Do not mark implementation completed while blockers remain or while a validation is failing.
  6. Run:
    • spec-forge-cli gate check --target <target-dir> --spec-id <spec-id> --stage implement --write
    • spec-forge-cli stage advance --target <target-dir> --spec-id <spec-id> --stage implement

Outputs

  • .spec-forge/specs/<spec-id>/synthesis/implementation-report.yaml
  • .spec-forge/specs/<spec-id>/gates/implement.yaml

Exit Gate

# Check
1 Readiness is approved and marked ready
2 implementation.completed is true
3 At least one validation is recorded
4 No validation has status failed or error
5 No blockers remain

Guardrails

  • Do not skip the readiness gate.
  • Do not mark implementation completed while blockers remain.
  • Do not omit validation results from the implementation report.
  • Do not close the pipeline when a validation has failed.
  • Do not ask the user to inspect YAML files directly. Summarize implementation progress and results in chat instead.
  • Do not introduce a separate approval gate for the implementation report unless the workflow contract changes; the implement stage closes on report contents plus gate evaluation.

Next Step

If the implement gate passes, the pipeline can advance to complete.