{"slug":"spec-driven-implementation","title":"spec-driven-implementation","summary":"Use when a feature begins or specs are checked in: author or update behavioral specs and keep them current with what ships. Not for producing the initial approved spec and plan: use spec-driven.","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-09-08T21:38:42.642892Z","repo":{"url":"https://github.com/OutlineDriven/odin-claude-plugin","stars":38,"forks":0,"license":"Apache-2.0","updatedAt":"2026-09-25T15:08:42Z"},"bodyHtml":"
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name: spec-driven-implementation\ndescription: 'Use when a feature begins or specs are checked in: author or update behavioral specs and keep them current with what ships. Not for producing the initial approved spec and plan: use spec-driven.'

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Spec driven implementation

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Contract

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FieldBound contract
TriggerStarting a significant feature or when specs are checked in.
AuthorityReversible local: writes only checked-in spec files and implementation; rollback is version control (if commit is not yet pushed). No remote mutation.
Side effectCreates or updates checked-in spec files within the project.
DoneSpecs exist, are behavioral, and stay current with what ships.
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Inputs

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Refusal

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Procedure

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  1. Bound the scope. From the feature brief and scope anchor, enumerate every file that will be created or modified. If the scope is ambiguous, stop and state the ambiguity rather than inferring a larger surface. Done when: the file set is enumerated or ambiguity is reported.
    2. \n
  2. Audit existing specs. For each spec file already present in the affected scope, verify it is behavioral: each statement describes observable behavior or acceptance criteria, not implementation design. Discard or narrow any spec line that prescribes a solution path. Done when: every existing spec is verified behavioral.
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  3. Identify spec gaps. Map every feature-brief item to at least one behavioral statement. Mark any item that cannot be expressed as observable behavior as out of scope. Done when: every brief item maps to a behavioral statement or is marked out of scope.
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  4. Write or update spec files. For each gap, add a new spec section with a unique label, the behavioral statement, any preconditions and expected outcomes, and the pass/fail criterion that a test could verify. Place each spec in the file that most directly covers the affected surface. Done when: every gap has a spec section.
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  5. Verify spec-implementation alignment. Confirm that no spec file contradicts an existing implementation. If a conflict exists, surface it before writing. Done when: no spec contradicts existing implementation.
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  6. Write or confirm the implementation. Implement the feature to satisfy the spec. Do not add behavior not described by a spec. Done when: the implementation satisfies every spec.
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  7. Commit with a spec-referencing message. VCS-commit the spec and implementation files with a message that names the spec label(s) satisfied. Done when: one commit names the satisfied spec labels.
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Output

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Checked-in spec files covering all behavioral requirements of the feature, aligned with the implementation, and commit messages naming the spec labels satisfied.

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