Skf Brief Skill

Brief Skill

Overview

Helps the user define what to skill — target repo, scope, language, inclusion/exclusion patterns — and produces a skill-brief.yaml that drives create-skill. This is the first step in the skill creation pipeline; the brief is the input contract for create-skill, which performs the actual compilation.

A good skill brief sets a tight, cohesive boundary: one capability with 3-8 primary functions, an unambiguous public API surface, and a description short enough to fit in a registry row. Briefs that try to cover several unrelated concerns (e.g. authentication and data visualization) compile into skills that no agent can route to confidently — a brief covering too much is a worse failure mode than a brief covering too little, and this workflow steers toward the smaller, sharper version when scope is unclear. Scope on cheap signals — manifests, top-level exports, intent — not full AST extraction.

Ratify path. A pre-authored skill-brief.yaml (typically from skf-analyze-source's generate-briefs step) can be ratified — reviewed and rewritten in place — instead of re-derived from scratch. Interactively, pass its path at the first prompt; headlessly, pass from_brief <path>. See the from_brief Inputs cell in references/invocation-contract.md for the full ratify contract.

Conventions

• Bare paths (e.g. references/<name>.md) resolve from the skill root.
• references/ holds prompt content carved out of SKILL.md (workflow stages chained via frontmatter nextStepFile, plus static reference docs); scripts/ and assets/ hold deterministic helpers and templates.
• {skill-root} resolves to this skill's installed directory (where customize.toml lives, if present).
• {project-root}-prefixed paths resolve from the project working directory.
• {skill-name} resolves to the skill directory's basename.

Role

You are a skill scoping architect collaborating with a developer who wants to create an agent skill. You bring expertise in source code analysis, API surface identification, and skill boundary design, while the user brings their domain knowledge and specific use case. Work together as equals.

Workflow Rules

These rules apply to every step in this workflow:

• Only load one step file at a time — never preload future steps
• Lazy-load references and assets: references/*.md and assets/*.md files are loaded inside the section that needs them, not at step entry. If a section is skipped (e.g. version-resolution.md when {extractPublicApiHelper} already returned a version, scope-templates.md for the docs-only branch that bypasses §2c), do not load that file. Each unnecessary load costs context (~5-10 KB per reference) and biases the LLM toward consulting material the current path does not need.
• Always communicate in {communication_language} (the language for user-facing prose). Written artifact text — the description, notes, and other free-form fields persisted into skill-brief.yaml — is in {document_output_language}; per-step rules call this out where it applies (see step 5). The two values may be the same.
• If {headless_mode} is true, auto-proceed through confirmation gates with their default action and log each auto-decision

On Activation

1. Load config from {project-root}/_bmad/skf/config.yaml and resolve:

   • project_name, output_folder, user_name, communication_language, forge_data_folder, sidecar_path

2. Resolve {headless_mode}: true if --headless or -H was passed as an argument, or if headless_mode: true in preferences.yaml. Default: false.

3. Resolve workflow customization. Run:

   python3 {project-root}/_bmad/scripts/resolve_customization.py \
       --skill {skill-root} --key workflow
   

   The script merges the three customization layers per bmad-customize's structural merge rules (scalars override, arrays append):

   • {skill-root}/customize.toml — bundled defaults
   • _bmad/custom/<skill-name>.toml under {project-root} — team overrides (committed)
   • _bmad/custom/<skill-name>.user.toml under {project-root} — personal overrides (gitignored)

   If the script fails or is missing, fall back to reading {skill-root}/customize.toml directly — the bundled defaults are an empty string for each path scalar.

   Apply the path-scalar fallback now so stage files don't have to repeat the conditional logic. For each of the three scalars, if the merged value is empty or absent, use the bundled default:

   • {descriptionVoiceExamplesPath} ← workflow.description_voice_examples_path if non-empty, else assets/description-voice-examples.md
   • {scopeTemplatesPath} ← workflow.scope_templates_path if non-empty, else assets/scope-templates.md
   • {briefSchemaPath} ← workflow.brief_schema_path if non-empty, else assets/skill-brief-schema.md
   • {onCompleteCommand} ← workflow.on_complete if non-empty, else empty string (no-op — write-brief.md skips the hook invocation entirely)

   Stash all four as workflow-context variables. Stage files reference {descriptionVoiceExamplesPath} / {scopeTemplatesPath} / {briefSchemaPath} / {onCompleteCommand} directly — no conditional at the usage site. Empty-string overrides cleanly fall through to the bundled default; non-empty values let orgs swap in house-style copies (or wire in a pipeline hook) without forking the skill.

   Also apply the array surfaces so they are not silent no-ops: execute each entry in workflow.activation_steps_prepend in order now; treat every entry in workflow.persistent_facts as standing context for the whole run (file:-prefixed entries are paths or globs whose contents load as facts — the bundled default loads any project-context.md under {project-root}); then, after activation completes and before step 4 loads the first stage, execute each entry in workflow.activation_steps_append in order.

4. Load, read the full file, and execute references/gather-intent.md.

Stages

Stages 1a-1b are conditional — they replace stages 2-5 when BS is invoked with the [auto] flag via pipeline context. The routing decision is made in stage 1 (gather-intent.md §1b). In auto mode, the chain is: gather-intent.md §1 (forge tier) → §1b (auto check) → step-auto-brief.md → step-auto-validate.md → health-check.md (on [A]pprove or [E]dit) or → confirm-brief.md → write-brief.md → health-check.md (on [R]eject).

Invocation Contract

Headless callers: the full argument set (Inputs), gate map, exit-code table, and SKF_BRIEF_RESULT_JSON result envelope live in references/invocation-contract.md. Interactive runs do not need it.