bmad-tech-spec

BMAD Tech Spec — Quick Flow

This skill produces a focused tech-spec.md for Quick Flow work: small, well-scoped features or changes that sit in the 1-15 story range. It consolidates the product rationale, technical approach, and story backlog into a single lightweight document, skipping the separate PRD + architecture artifacts that larger tracks require.

Track guidance

• 1-15 stories, single team, clear requirements → Quick Flow (this skill)
• 10-50+ stories, multiple concerns, or uncertain scope → use bmad-prd then bmad-architecture
• 30+ stories, cross-org, security/compliance/DevOps dimensions → Enterprise track

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Workflow

Step 1 — Identify intent

Ask the user (or infer from context) which of three intents applies:

Intent	When
Create	No tech-spec.md exists yet
Update	Revising scope, requirements, or approach in an existing spec
Validate	Checking a draft spec for BMAD completeness before moving to stories

Step 2 — Gather context

For Create, collect (interactively or from existing project files):

1. Problem & solution — what are we solving and how?
2. Scope — what is in scope? What is explicitly out of scope?
3. Functional requirements — numbered, MoSCoW-tagged (MUST / SHOULD / COULD)
4. Non-functional requirements — performance, security, accessibility targets that are relevant; omit boilerplate that does not apply
5. Technical approach — stack, key components, data model sketch, API surface (if any)
6. Story list — high-level backlog items; the scrum-master skill will compile them into full story files
7. Dependencies & risks — third-party libs, external services, known unknowns
8. Decision log entries — any choices made during this conversation that belong in bmad-output/decision-log.md

Load bmad-output/project-context.md if present — it is the project constitution and must not be contradicted without a recorded decision.

For Update, read the existing bmad-output/tech-spec.md first, then apply targeted edits and log what changed in the decision log.

For Validate, read the existing spec and report against the checklist in the Validation Checklist section below.

Step 3 — Draft or revise

Render the template at:

${CLAUDE_PLUGIN_ROOT}/skills/bmad-tech-spec/templates/tech-spec.template.md

Fill every section. Omit sections that genuinely do not apply (e.g., no API design for a pure-CLI tool) and note the omission inline. Do not leave unreplaced {{placeholders}}.

Testing strategy in the spec is planning only — describe what should be tested and why. Do not write test code. Do not set coverage numbers as mandatory targets; frame them as guidance for the dev team.

Step 4 — Write output

Write to bmad-output/tech-spec.md (respecting the outputFolder user config if set).

If decision-log entries were made, append them to bmad-output/decision-log.md (create the file if it does not exist, using the format: ## [YYYY-MM-DD] <title> / **Decision:** ... / **Rationale:** ...).

Step 5 — Confirm next steps

After writing, tell the user:

• The spec is the Quick Flow planning artifact. Story creation is the next step.
• Use bmad-epics-and-stories to compile stories from the story list in the spec.
• If scope has grown during this conversation beyond ~15 stories, recommend switching to the BMad Method track (bmad-prd + bmad-architecture) before proceeding.

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Validation Checklist

When intent is Validate, report pass/fail for each item:

• Problem statement is clear and specific
• Solution is described without implementation code
• All functional requirements are numbered and MoSCoW-tagged
• Non-functional requirements include at least one performance or security entry if applicable
• Technical approach names the stack and describes key components
• Story list exists and each story title is one-line, action-oriented
• Story count is 1-15 (flag if over)
• No unreplaced {{placeholders}} remain
• Testing section describes strategy only (no executable test code)
• Dependencies table lists version or version constraint
• Risks table lists at least one risk with a mitigation
• Decision log entries have been written for any significant choices
• No content instructs a dev agent to run tests, lint, build, or deploy

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Subagent Strategy

This skill is primarily single-threaded (one conversation, one document). Parallelism is optional and limited to information gathering:

• If the user wants concurrent research (e.g., compare two tech options), spawn two WebSearch/WebFetch agents in parallel and synthesize results before writing the spec.
• Do not spawn parallel agents for writing — the spec is one coherent document and must be written atomically to avoid merge conflicts.

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Part of the BMAD Planning & Orchestrator plugin — a Claude Code harness for the BMAD Method by the BMAD Code Organization (https://github.com/bmad-code-org/BMAD-METHOD). Implements the spirit of bmad-tech-spec. All methodology credit belongs to the BMAD Code Organization.