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name: contract-builder description: Maintain an execution contract only for an existing legacy change that requires one. New direct/planned changes do not invoke this skill when a contract is absent.

Contract Builder

Bundled runtime

Before executing a CLI line below, replace its leading SSF with node "<plugin-root>/scripts/spec-superflow.mjs"; <plugin-root> is the absolute directory two levels above this file. Never run SSF literally or call an ssf from PATH.

Legacy compatibility only: new planned changes use proposal.md + tasks.md and SSF workflow start --path planned. Do not generate a contract or request a second approval for them. Read the remaining instructions only for an existing legacy change.

Converts planning artifacts into a single execution handshake: execution-contract.md. Load the baseline with SSF runtime asset read templates/execution-contract.md.

Read before generating: .spec-superflow.yaml (especially dp_0_decisions), proposal.md, specs/, design.md, tasks.md, then load docs/artifact-contract.md with SSF runtime asset read docs/artifact-contract.md.

Enter bridging before writing the contract; skip the transition if already there. Honor configured specs/design omissions. Reference requirement IDs and task IDs instead of copying their full text; preserve scope, obligations, tests, and review policy.

Artifact Language

Read artifact_language=<concrete-language> from dp_0_decisions. Generate execution-contract.md in the same language as that resolved value and the approved planning artifacts. Preserve required schema keywords and code identifiers verbatim; language consistency applies to explanatory prose and headings. If the concrete artifact language is missing or still auto, route back to workflow-start before writing the contract instead of guessing or silently defaulting to English.

Artifact Mapping

Source	Extract
proposal.md → ## Why + ## What Changes	Intent Lock (problem + scope)
proposal.md → ## Scope > ### Out of Scope	Scope Fence
specs/ → each ### Requirement:	Approved Requirements, Scenarios, Test Obligations
design.md → ## Decisions	Architecture, Interface, Dependency Constraints
tasks.md → numbered task groups	Execution Batches, Completion Definitions, Review Timing

Cross-Check: Requirement Coverage

Before finalizing:

1. List every SHALL/MUST from specs/
2. Verify each is reflected in Approved Behavior, has a test obligation, and appears in at least one batch
3. Flag unmapped requirements in Escalation Rules
4. Note cross-batch dependencies

Contract Structure

Must make obvious: approved behavior, out-of-scope, constraints, batches, test obligations, review gates, and conditions that force a rewind to planning. Prefer compression over repeating planning details.

Approval Model (DP-3)

After drafting: summarize handoff rules, identify ambiguity and flag unmapped requirements. Reuse explicit approval already covering this exact contract; otherwise request it once, together with any still-pending planning decisions and the default Native execution choice. Approval of scope alone does not approve a contract that has not been shown. Never ask the user to approve the same unchanged contract twice. After approval:

SSF state set <change-dir> dp_3_result "approved: <summary>"
SSF state set <change-dir> dp_3_timestamp now
SSF state rebuild <change-dir>

Advance the state after approval:

SSF state transition <change-dir> approved-for-build

DP-3 is a hard gate — no implementation without this record.

Stale Contract Detection

Refresh if: scope changed in proposal, requirements changed in specs, constraints changed in design, batches changed materially in tasks, or the contract no longer matches intent.

Hotfix Mode

Generate a minimal contract only for a legacy Hotfix: Intent Lock (one sentence), Task List (numbered), Approval Gate (DP-3). Skip Scope Fence, Build Rules, Review Gates, Test Evidence. Still requires DP-3 approval. Quick direct execution and direct incident Hotfix do not invoke this skill; they use the signed receipt and finish with test_result: pass instead.

Guardrails

• Do not continue to implementation if ambiguity remains
• Do not approve the contract on the user's behalf
• Do not skip the contract because planning docs look complete
• Flag unmapped requirements; do not silently drop them

Post-Generation

The approved contract is recorded by state rebuild in the DP-3 sequence above, before the guarded transition. This applies to Full and legacy Hotfix. Do not refresh hashes merely to suppress an unapproved content change.

Exception Handling

• Parse failures: Report specific file and section. Suggest re-running spec-writer.
• Missing files: List every missing artifact. Route back to spec-writer.
• User interruption: Re-read all artifacts on resume; check contract staleness via content comparison.
• Validation failure: Flag unmapped requirements in Escalation Rules and approval summary.