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Internal project modification rules loaded only by the explicit /spec-driven prompt with a confirmed design path or direct project change request.
user-invocable
false
disable-model-invocation
true
Spec-Driven Development
Turn an explicitly supplied confirmed project design document or direct project change request into SPEC-grounded implementation, verification, and independent audit. This internal skill implements the required /spec-driven project write entry point; /requirements-to-design is optional upstream input refinement.
Invocation Gate
Load this skill only when the user explicitly invokes .github/prompts/spec-driven.prompt.md with either a confirmed project design document path or a direct project change request. Do not infer invocation or prompt input from ordinary discussion, editor state, a natural-language project edit request outside the prompt, a skill-name mention, or prose approval. If the explicit prompt or a non-empty input is absent, stop without writing and ask the user to invoke /spec-driven <confirmed-design-document-path | direct-project-change-request>.
This skill does not handle workflow-control-only maintenance. If the supplied input changes only AGENTS.md, CLAUDE.md, .github/copilot-instructions.md, .github/prompts/**, or .github/skills/**, stop and explain that a clear ordinary edit request is sufficient.
Core Rule
SPEC.md files are the source of truth for project implementation and must describe current project or module facts.
Root SPEC.md owns current project-wide architecture, module navigation, dependency diagrams, project development constraints, and project implementation invariants.
Module SPEC.md files own current module contracts, public interfaces, internal structure, dependencies, error handling, architecture level, and current invariants.
Design documents, implementation notes, migration history, removed behavior, future roadmap, and detailed test matrices are not SPEC content unless they describe a currently supported compatibility behavior or a current verification obligation.
Project SPEC files must not define, duplicate, or override the SDD workflow. Agent workflow files may consume project SPEC as audit input, but they must not make SPEC the authority for how SDD is invoked or executed.
Project implementation may start only after required SPEC.md changes are reviewed and confirmed, or after a no-SPEC-delta decision is recorded with concrete existing-SPEC and defect evidence. If current SPEC does not ground the intended supported behavior, a SPEC delta is required.
SPEC Hygiene Rule
Before writing or updating any SPEC.md, apply this filter:
Keep: current behavior, current public API, current module ownership, current dependency direction, current configuration surface, current error semantics, current architecture level, and current invariants that constrain implementation.
Keep as compatibility facts only when true in code: legacy input shapes, compatibility aliases, obsolete keys that are actively rejected, and supported migration shims. Write them as present-tense facts, not as history.
Move out of SPEC: why a decision was made, discarded alternatives, design-process narrative, implementation plan, future platform ideas, planned signatures, target-state wording, removed behavior that code no longer accepts, and exhaustive test case lists.
Avoid process markers such as target, planned, future, after this change, this SPEC cycle, first batch, transitional, removed, previously, and during migration unless the sentence is documenting a current compatibility fact or current rejection behavior.
If a module SPEC starts to become a reference manual, keep only ownership and invariants in SPEC and move tables, examples, endpoint catalogs, or command catalogs to a reference document.
Required Flow
explicit /spec-driven <confirmed-design-document-path | direct-project-change-request>
-> resolve and clarify the input
-> read current SPEC and implementation evidence
-> determine whether a SPEC delta is required
-> if required: update root/module SPEC.md and get user confirmation
-> if none: record existing-SPEC and defect evidence
-> implement against confirmed SPEC.md
-> run verification
-> run consolidated spec-implementation-audit
-> batch-fix complete finding set
-> incrementally re-audit affected findings and boundaries
-> final report
Do not redirect a direct project change request to /requirements-to-design; that design phase is optional. Clarify ambiguous direct input within /spec-driven before deciding the SPEC delta or writing project files.
Input Resolution
If the input resolves to a design document path, require the document to exist and be user-confirmed, then read it before deciding the SPEC delta. Design documents normally use:
If the input is not a design document path, treat the complete prompt argument as the direct project change request. Read enough current implementation, tests, and local documentation to remove material ambiguity. Ask focused questions when two materially different implementations remain possible, but do not require a separate design document.
A design document or direct request is input to the SPEC-delta decision, not final project implementation authority. Project code must be implemented against current confirmed SPEC.md files.
When translating a design document into SPEC updates, copy only the resulting current contract. Do not copy the design process, rejected options, implementation sequence, temporary target state, or historical narrative into SPEC.
SPEC Delta Decision
Before modifying non-SPEC project files, read the root and relevant module specs plus enough implementation and verification evidence to classify the request.
A no-SPEC-delta path is allowed only when all of these are true:
Current SPEC already grounds the intended supported behavior and remains accurate after the repair.
The request restores implementation conformance rather than adding or changing a supported contract.
Public interfaces, configuration semantics, module ownership, dependency direction, architecture level, and the set of supported behaviors remain unchanged.
The defect is demonstrated by concrete implementation evidence, a failing focused test, or a reproducible behavior mismatch.
Record the no-SPEC-delta decision before implementation with precise SPEC references, defect evidence, and the boundaries expected to remain unchanged. A user label such as bugfix or no-spec-delta is not proof and does not control this decision.
If any condition is unproven, current SPEC is missing or wrong, or the requested behavior conflicts with SPEC, a SPEC delta is required. Update the relevant current-fact specs and get user confirmation before modifying non-SPEC project files. Never add artificial SPEC text solely to manufacture a delta.
Python Architecture Integration
For Python projects or Python modules, apply the sibling python-architecture rules layer before:
Choosing module ownership.
Writing or updating module SPEC.md files.
Implementing code.
Running the consolidated project implementation audit.
When this bundle is installed under .github/skills/, the references are expected at:
Load only the reference needed for the current phase:
SPEC design or module ownership: architecture-levels.md and module-spec-template.md.
Implementation: implementation-rules.md.
Consolidated project audit: audit-checklist.md.
If the sibling files are unavailable, apply the local Python rules below and continue.
Python Rules Summary
Default to the simplest architecture level that satisfies the SPEC.
Do not introduce Repository, Unit of Work, Service Layer, Clean Architecture, or DDD patterns without a SPEC-recorded reason.
Public APIs are exported through module entry points such as __init__.py.
Internal modules use the project convention, usually _name.py, and must not be imported across module boundaries.
Domain logic must not depend on FastAPI, Django, Flask, SQLAlchemy sessions, HTTP request objects, or CLI argument parsers unless the module SPEC explicitly permits that coupling.
Pydantic schemas, serializers, ORM models, and DTOs are boundary models unless the SPEC explicitly chooses a simpler combined model.
Frontend Architecture Integration
For frontend projects or modules, apply the sibling frontend-architecture rules layer before:
Choosing frontend module ownership.
Writing or updating frontend SPEC.md files.
Implementing frontend source, build, or dependency changes.
Running frontend verification and the consolidated project implementation audit.
Load only the reference needed for the current phase:
Requirements or visible design: architecture-levels.md and, when applicable, design-rules.md.
SPEC ownership and authoring: architecture-levels.md and module-spec-template.md.
Implementation: implementation-rules.md.
Verification: verification-checklist.md.
Consolidated project audit: audit-checklist.md.
Frontend rules do not create a new user entry point and must not be fetched from remote sources at runtime. New frontend application modules default to the root Vite workspace with React and TypeScript/TSX. Existing modules keep the framework and language in their confirmed module SPEC until a separate SPEC update authorizes a migration.
SPEC Update Procedure
New module or feature
Read root SPEC.md and relevant module SPEC.md files.
Read the resolved design document or direct project change request.
Decide which module owns the feature, or whether a new module is needed.
For Python work, choose the Python architecture level and write the rationale into SPEC.
For frontend work, choose the frontend architecture level or accurately record a current legacy exception and write the ownership boundaries into SPEC.
Write or update relevant module SPEC.md files.
If adding a module or changing module relationships, update root SPEC.md module table and architecture diagram.
Ask the user to confirm SPEC changes before implementation.
Implement only after confirmation.
Run verification and the consolidated project implementation audit.
Existing functionality change
Read root SPEC.md and current module specs for every touched module.
Read the resolved design document or direct project change request.
Determine impact: public interface, module contract, internal-only, or cross-module dependency change.
Apply the SPEC delta decision rules.
When a delta is required, update relevant specs and ask the user to confirm them before implementation.
When no delta is required, record the required evidence and proceed without editing SPEC.
Implement against current confirmed SPEC.
Run verification and the consolidated project implementation audit.
Module SPEC Structure
Every module has exactly one SPEC.md. Use this structure unless root SPEC.md defines a compatible local convention:
# Module: {name}
## Purpose
## Dependencies
## Public Interface
## Internal Structure
## Python Architecture (for Python modules)
## Data And State Flow (for stateful frontend modules)
## Frontend Architecture (for frontend modules)
## Error Handling (if applicable)
## Verification Scope (optional; current externally visible verification obligations only)
## Current Invariants (optional; present-tense constraints that keep implementation aligned)
Root SPEC.md should contain repository-wide sections such as:
Do not add Testing Contract or Design Decisions as default sections for new module specs. Existing sections with those names should be narrowed during touched updates: test matrices move to tests/docs, while decision rationale becomes current invariants only when it still constrains code.
Project Implementation Rules
After required project SPEC confirmation or a recorded no-SPEC-delta decision:
Re-read confirmed root/module specs.
Implement only what the confirmed specs require.
If implementation reveals a missing or wrong SPEC decision, stop and update SPEC first.
Keep edits scoped to affected modules and tests.
For behavior changes, write or update tests before production code unless the user explicitly accepts a generated-code or throwaway exception.
For frontend work, follow the confirmed framework/language contract and the staged frontend implementation rules; do not mix a partial migration into an existing exception.
Run the repository's available verification commands and the applicable frontend verification checklist.
Project Audit Lifecycle
After project implementation verification, spec-driven starts a complete project audit. Every audit pass must independently establish the full applicable-item inventory from the current SPEC inputs and complete current diff, then inspect every item before returning. Finding the first blocker must not end the pass, and implementation repair must not begin while the audit is still in progress.
Audit Artifact And Identity Gate
For a worktree audit, create the complete tracked diff as a file directly through Git, such as git diff HEAD --no-ext-diff --binary --output=<artifact>. Never use terminal-captured stdout or a tool's overflow wrapper as the audit artifact.
Before starting the reviewer:
Record the artifact's absolute path, SHA-256, byte size, and diff --git entry count.
Record Git's complete changed-path inventory and verify its count and paths agree with the artifact.
Verify that no in-scope untracked project file is omitted. Include each such file as a separate complete artifact with its path and SHA-256, or stop as audit-blocked.
Give the reviewer the artifact identities and require it to validate them before auditing. A missing, truncated, wrapped, mismatched, or unreadable artifact is audit-blocked; do not substitute a live diff or an implementation summary.
Treat the verified artifact identities as the audit snapshot. Do not intentionally edit in-scope project files while the audit is running. After a passing audit and immediately before claiming completion, regenerate the worktree artifacts with the same commands and compare their SHA-256 values and path inventory with the audited snapshot. Any mismatch makes the prior pass stale and requires verification plus a new complete audit. For an audited commit range, record the exact immutable base and head object ids instead of a worktree artifact hash.
Each audit result must contain precise SPEC references, concrete diff evidence, verdicts, repair ownership, one complete coverage table, and the full finding set. The only allowed early return is audit-blocked when required authority inputs, tools, or artifacts are unavailable. audit-blocked is not a passing verdict and does not consume a repair round.
After the complete result returns:
Group all open findings by implementation repair, authority/human decision, or verification environment.
Resolve authority/human decisions and verification-environment blockers before starting an implementation repair batch when they can change or prevent that repair.
Repair all in-scope implementation-fixable blocking findings in one batch. Do not trigger another audit after only a partial repair.
Complete the affected verification for the entire repair batch.
Start a new complete audit against the current SPEC inputs and complete current diff. Do not reuse prior item verdicts or limit the audit to repaired paths.
Repeat complete audit, complete repair, and verification rounds until one complete audit has no blocking findings.
The implementation agent may explain its repair but may not declare audit findings resolved. Only the next complete independent audit determines whether the current implementation passes. Do not provide persuasive implementation summaries to the reviewer.
Run at most two automatic repair rounds. If the complete audit after the second repair round still has blocking findings, or one complete repair and re-audit round makes no substantive progress, pause automatic repair and present the complete current finding set, current evidence, attempted repair rounds, reviewer rationale, and concrete human decision options. The findings remain blocking until an allowed decision and any required project SPEC confirmation are complete.
Consolidated Project Implementation Audit
For a project change, spec-implementation-audit owns the applicable-item inventory, verdict semantics, evidence, and complete-pass coverage. SPEC/code synchronization is a category in that audit, not a separate scan. Include these checks when applicable:
Root SPEC.md module table matches actual modules.
Root SPEC.md architecture diagram matches actual project dependencies.
Module SPEC.md Public Interface matches exported public symbols.
Module SPEC.md Dependencies match actual imports from other project modules.
Module SPEC.md Internal Structure lists actual module files.
Python Architecture section matches package layout, import direction, framework boundaries, and model boundaries.
Parent and child frontend SPEC ownership matches the workspace and application directories without duplicated contracts.
Frontend Public Interface, Data And State Flow, Internal Structure, and Frontend Architecture match entries, source, state ownership, transport boundaries, framework, and language.
Frontend manifest, lock file, Vite configuration, generated-output policy, and required browser evidence match the confirmed specs.
SPEC text contains current facts only; design process, historical narrative, target-state wording, future roadmap, and detailed test matrices are absent or moved elsewhere.
Before claiming project completion, read and run:
.github/skills/spec-implementation-audit/SKILL.md
Audit against the current project authority inputs and actual diff:
root SPEC.md + relevant module SPEC.md files + actual diff
Tests, lint, and summaries are supporting evidence only. They do not replace diff-based SPEC audit.
If project SPEC itself needs correction, stop project implementation, update and confirm the applicable SPEC, reconcile the implementation and verification with it, and start a new complete project audit.
Completion Gate
Do not claim completion while any blocking finding remains. Completion also requires:
a complete latest audit pass over the current SPEC inputs and complete current diff;
a matching post-audit artifact identity check proving the current worktree or immutable commit range is exactly the audited snapshot;
a complete applicable-item inventory;
concrete diff evidence and a current verdict for every item;
no implementation-fixable blocking finding in the latest independent audit;
required verification run or unavailable verification reported as blocking;
any accepted needs-human-decision recorded explicitly.
Required Final Report
End with:
Input type: confirmed design document or direct project change request.
Project specs updated and confirmed, or the no-SPEC-delta decision with precise SPEC and defect evidence.
Files implemented.
Verification commands run and results.
Audited SPEC inputs, diff artifact identities or exact commit range, post-audit identity result, and latest complete-audit status.
Complete current finding status, repair rounds performed, and any accepted human decisions.
