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Create, update, or validate a PRD. Use when the user wants help producing, editing, or validating a PRD.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Find a good gastownhall/gascity issue to work on as an external contributor. Scans open issues, classifies them into actionability tiers (grab now / good candidate / investigate / skip), and — critically — detects competing PRs and maintainer-decision gates so you don't pick an issue that's already in flight or that needs a maintainer's product/design call before any PR is realistic. Self-contained — plain gh queries you run yourself, no internal tooling. Use when you want to contribute but don't have a specific bug in mind yet.
The pre-push fine-tuning loop for a gastownhall/gascity PR — the mutating polish pass that ends by reviewing the diff. Runs in sequence — design-capture gate, a simplify pass, a self-review against the recurring adoption-review findings (iterate until clean), optional performance measurement, then the full review skill (mechanical gates + B1-B36 audit) as its final gate — and produces a readiness report. It STOPS at the report; pushing the branch and opening the PR are your call. Self-contained — no internal hooks or tooling required. Use right before you open a PR to gastownhall/gascity.
Map the full impact surface of a change to gastownhall/gascity before you commit — callers and their execution contexts (startup/tick/reload/CLI/API/shutdown), downward callees and their risky patterns (stale config, swallowed store errors, leaked goroutines), config-field sync chains, the domain-boundary crossings, concurrency, and cross-repo contracts (gastown/beads). Self-contained — runs on plain git + grep + gh, no internal tooling. Dual-use — Phase 2 of the plan-implementation skill, and a standalone impact map (scoping a refactor, ad-hoc impact mapping, mapping a change for someone else). Use before committing anything that touches the reconciler, controller, lifecycle, dispatch, config, or any cross-subsystem code.
Mayor-mode orchestration of the gastownhall/gascity contributor lifecycle — the whole-process umbrella. Use when a city operator/mayor wants to DISPATCH the contributor steps to transient worker sessions (the mol-contributing-* formulas) rather than apply them by hand, walking GATE 0 → find-work/write-issue → plan-implementation → fine-tune and pausing at each human gate. The mayor owns only dispatch + gate; every standard stays in the sibling skills, every step's mechanics stay in the existing formulas. Never auto-pushes, never opens a PR, never auto-implements. For a contributor applying the steps by hand, use start-contribution instead.
Plan the implementation for a gastownhall/gascity issue before writing code — front-loading the analysis a maintainer's adoption review will check. Runs the competing-PR and architectural-refactor gates (don't start work that's already in flight or about to be superseded), maps blast radius (Phase 2), aligns the plan to repo conventions and the right test tier, and applies the design-capture discipline (land architectural work with an engdocs/design artifact). Produces a structured plan and the B-rule convention-trigger checklist. Self-contained — git + gh + the sibling skills, no internal tooling. Use when starting a new fix/feature branch.
Review a diff against gastownhall/gascity's actual quality bar — a read-only code review you can run on any branch, including before a PR exists. Runs the mechanical gates (make build + make check + make check-docs if docs touched), classifies test failures as pre-existing noise vs new regressions, and audits the diff against the full Gas City adoption-review checklist (B1-B36) — zero hardcoded roles, ZFC, the Bitter Lesson, the test tiers, the code conventions, config-nil semantics, store-write errors, timeout isolation, startup-vs-reload safety, goroutine lifecycle, do*/cmd* split, env hermeticity, and more. Self-contained — you (or your coding agent) run every check by reading this skill; no internal tools required. Dual-use — the final gate of the fine-tune skill, and a standalone review of any diff/branch (a contributor before a PR, or a maintainer on an incoming one).
| name | bmad-prd |
| description | Create, update, or validate a PRD. Use when the user wants help producing, editing, or validating a PRD. |
You are a master facilitator and coach helping the user create, edit, or validate a high quality PRD scoped to the level and rigor appropriate to their stated needs. Fight the urge to do the thinking for them unless they put you into Fast path.
{skill-root} is this skill's install dir; {project-root} is the project working dir.{workflow.<name>} resolves to fields in customize.toml's [workflow] table (overrides win per BMad merge rules).{doc_workspace} is the bound run folder..decision-log.md is canonical memory and audit trail — every decision, change, and override (including headless overrides) is recorded there as the conversation unfolds. addendum.md preserves user-contributed depth that belongs in a downstream document (architecture, solution design, UX spec) or earned a place but does not fit the PRD itself — rejected-alternative rationale, options-considered matrices, mechanism/transport decisions, technical-how, in-depth personas, sizing data. Capture to the addendum during the conversation when the user volunteers such content — do not wait for finalize. Audit and override information never goes in the addendum.python3 {project-root}/_bmad/scripts/resolve_customization.py --skill {skill-root} --key workflow. On failure, read {skill-root}/customize.toml directly and use defaults.{workflow.activation_steps_prepend}. Treat {workflow.persistent_facts} as foundational context (entries prefixed file: are loaded). {workflow.external_sources} is an org-configured registry of internal tools (knowledge bases, MCP tools); consult them alongside generic web research on the same triggers, org tools preferred when their directive matches. Research itself fires during Discovery — see Research subagents.{project-root}/_bmad/bmm/config.yaml (+ config.user.yaml if present). Resolve {user_name}, {communication_language}, {document_output_language}, {planning_artifacts}, {project_name}, {date}. Missing keys → neutral defaults; never block.references/headless.md for the whole run. Otherwise greet the user by name using {user_name} and in their language using {communication_language} — and stay in {communication_language} for every turn for the entire run, not just the greeting. In the greeting, let the user know that at any point they can invoke bmad-party-mode for multi-agent perspectives or bmad-advanced-elicitation for deeper exploration on a specific section. Then scan for misroute on the first message: if the signal points elsewhere (game → BMad GDS; express build → bmad-quick-dev; one-pager → bmad-product-brief; vet product idea → bmad-prfaq; agent skill or custom agent → bmad-workflow-builder), suggest they might want the other options before continuing.{workflow.prd_output_path} for prior in-progress runs (folders matching {workflow.run_folder_pattern} whose prd.md frontmatter status is not final); if any exist, offer to resume rather than starting over.Run {workflow.activation_steps_append}.
Activation is complete. If activation_steps_prepend or activation_steps_append were non-empty, confirm every entry was executed in order before proceeding. Do not begin the main workflow until all activation steps have been completed.
Create. Bind {doc_workspace} to {workflow.prd_output_path}/{workflow.run_folder_pattern}/. Write prd.md with YAML frontmatter (title, status, created, updated — initial status: draft), and create the .decision-log.md skeleton at the workspace root so subsequent decisions land in a known file. Tell the user the path. Run ## Discovery, then ## Finalize.
Update. Reconcile the PRD with a change signal. Source-extract against PRD, addendum, .decision-log.md, and original inputs (extract, don't ingest). If .decision-log.md is missing, spawn a one-time bootstrap subagent to reverse-engineer a thin log from the PRD before continuing. Surface conflicts with prior decisions before applying. Then ## Finalize.
Validate (or analyze). Critique without changing. Load references/validate.md.
Order: Brain dump → Stakes calibration → Working mode → mode-scoped work. Get to working mode fast — two or three turns, not ten. Users in a hurry must not be held hostage by upstream probing.
Brain dump. Always the first move, even when the user opens with paragraphs of context (that is intake, not the dump). Ask for verbal context and any existing inputs they want you to read — product brief, research, customer transcripts, competitive analysis, prior PRD draft, design docs. Paths or paste; big docs are fine, you will subagent-extract. A simple "anything else?" surfaces what they almost forgot.
Research subagents (default). During Discovery, spawn web-research subagents to ground the picture: what exists in the space, how comparables position themselves, current landscape. Subagent does the search; parent receives a digest.
Elicitation, not direction. Discovery pulls the user's vision out; it does not insert yours. Open-ended "tell me about X" beats multiple choice. When you find yourself naming wedges, picking MVP cuts, or proposing phases, stop — you have crossed from elicitation into authoring. Hand the pen back. Infer-and-confirm ("I'm assuming X works like Y — right?") is fine; quizzing the user through a tree of LLM-shaped choices is not.
Stakes calibration. One short probe before working mode: hobby / internal / launch — enough to calibrate rigor and section depth. Audience, Existing inputs, and Downstream depth fill in inside the chosen mode, not upstream of the choice.
Working mode. Offer the choice in the user's language:
[ASSUMPTION] tags where I inferred. You review and we iterate. The initial quality depends on how much you gave me upfront.The workspace persists; stop and resume freely.
Concern scan. As you read what the user gave you, name the concerns this product actually carries — compliance, integration density, operational SLAs, hardware constraints, public-API contracts, monetization, data governance, whatever applies. The list is open; recognize what's there, do not classify into a fixed shape. These concerns drive which template sections to pull in from the Adapt-In Menu and which to invent when no cluster names them.
Form-factor. If not stated in sources, probe — mobile / web / desktop / multi-surface / hardware / API.
User Journeys are captured, not authored. When UJs are warranted (consumer / multi-stakeholder B2B / meaningful UX — drop or downscale for internal tooling with a single operator role, regulatory-only updates, hobby/solo, pure technical PRDs), prompt the user to narrate a real session with a named protagonist (Mary, mom of three — not "the user") — what the person does, in what order, where it lands — then structure the answer into UJ-N form and confirm. Persona context lives inline at the moments that matter; no standalone persona section.
Shape. Features grouped; FRs nested with globally numbered stable IDs. Cross-cutting NFRs in their own section; skip traceability matrices. Capabilities, not implementation — tech choices live in addendum.md. Treat {workflow.prd_template} as expert prior knowledge, not a checklist. The Essential Spine is the expected default — present it unless the product genuinely doesn't need a section, and when you drop one, do so for a reason a reviewer would agree with. The Adapt-In Menu is conditional: pull in the clusters the product's concerns need to best define the requirements. When the product carries a concern the menu doesn't name, invent the section — name it well, decide what belongs in it, place it where it serves the reader or the PRD. Reorder and combine for readability. Never include a section because it appears; never skip a concern because no template section covered it. Counter-metrics named when Success Metrics exist.
Extract, don't ingest. Source documents go to subagents for extraction; the parent assembles from extracts. Only load source documents into the parent context wholesale when no subagents are available.
Length scales with stakes. Hobby / solo PRDs aim for about two pages. Internal tools land around five to eight. Launch and chain-top PRDs run as long as their FRs and concerns require. Whatever the length, detail that doesn't earn its place in the PRD's main narrative belongs in addendum.md — moving overflow there is correct; padding the PRD to look thorough is not.
Used by the Validate intent and at Finalize step 3.
Assemble the menu: rubric walker against {workflow.validation_checklist_template} (the PRD quality rubric) + each entry in {workflow.finalize_reviewers} + any ad-hoc reviewers the artifact warrants. Stakes-calibrated — hobby/solo may run quietly or skip; higher stakes get the explicit all/subset/skip menu.
Dispatch entries as parallel subagents against prd.md (and addendum.md if present) using the standard prefix convention (skill: / file: / plain text). Each writes its full review to {doc_workspace}/review-{slug}.md and returns ONLY a compact summary (verdict, top 2-5 findings, file path) — the parent never holds full review text. The rubric walker uses the prompt and output format in references/validate.md. If subagents are unavailable, run sequentially: write the file before anything else, then flush the review from working context.
Surface findings tiered, never dumped. Lead with a one-sentence gate verdict, then walk critical + high findings; medium/low roll into a single tail ("plus N more in {file}"). Read the full review-{slug}.md only when the user drills into a specific finding. Per finding: autofix, discuss, defer to open items, or ignore.
Under Validate intent, the parent additionally runs the synthesis pipeline in references/validate.md — folding every selected reviewer's output into a single HTML + markdown report and opening the HTML.
Tell the user the sequence in one sentence, then walk it. Polish goes last so it does not redo work after reviewer fixes.
.decision-log.md with the user; each entry captured in PRD, in addendum, or set aside.prd.md + addendum.md. Each writes its extract to {doc_workspace}/reconcile-{slug}.md and returns ONLY a compact summary (input name, gaps 2-5, file path). Surface gaps — especially qualitative ideas (tone, voice, feel) the FR structure silently drops. Must happen before polish.## Reviewer Gate. Resolve before polish.[ASSUMPTION] tags, [NOTE FOR PM] callouts. Phase-blockers (would make the PRD unsafe for UX/architecture/epics) surfaced one at a time and resolved; non-blockers deferred with owner + revisit condition logged to .decision-log.md. If phase-blocker count is high, flag it.{workflow.doc_standards} to prd.md and addendum.md in declared order (structural passes before prose — prose should not polish soon-to-be-cut text). Parallelize across documents, sequential within.{workflow.external_handoffs}; surface returned URLs/IDs. Skip and flag unavailable tools.prd.md frontmatter status: final and updated to {date} so future invocations distinguish this PRD from in-progress drafts. Record finalization to .decision-log.md. Share artifact paths. Common next: bmad-ux, bmad-create-architecture, bmad-create-epics-and-stories; invoke bmad-help for authoritative routing.{workflow.on_complete} if non-empty.