implement

A workflow for building a software feature from a PRD, a product requirements document that describes what should be built. It checks related architecture and specification documents, chooses an available design source, then adds the implementation, tests, and required documentation.

In plain words
What is it for?
Use it with a PRD to plan and implement features, including interface work based on a design handoff, Figma file, or project design system.
Why use it?
It connects product requirements with the existing codebase and design decisions before work begins, reducing missed requirements and inconsistent interfaces.

Command for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/rtazima/claude-proj-blueprint/implement
Clone the repo
git clone --depth 1 https://github.com/rtazima/claude-proj-blueprint

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 419 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00419
Opus 5 $0.00000 $0.00210
Sonnet 5 $0.00000 $0.00084
Haiku 4.5 $0.00000 $0.00042

Measured 3d ago against content hash fea854471ded, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implement scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/implement.md · 33 lines

What it actually says

Implement a feature from a PRD.

Arguments: $ARGUMENTS (PRD path, e.g. docs/product/feat-auth.md)

Workflow:

  1. Read the PRD at $ARGUMENTS
  2. Enter Plan Mode — create a detailed plan before coding
  3. Check related ADRs in docs/architecture/
  4. Check applicable specs in docs/specs/
  5. Detect design flow (in priority order):
    • If docs/design/<prd-slug>-PROMPT.md exists OR PRD references a Claude Design handoff → activate claude-design-handoff skill: parse PROMPT.md, reconcile against CLAUDE.md + PRD, produce reconciliation report, resolve conflicts with user, then hand off to frontend-agent
    • Else if the PRD contains a Figma link → use Figma MCP to extract design context, then implement
    • Else → activate the frontend-agent skill: a. Load design tokens from docs/specs/design-system/README.md b. Scan existing UI components for consistency c. Generate UI from PRD requirements + tokens + component library
  6. Implement following CLAUDE.md and the implement-prd skill
  7. Create tests following the testing skill
  8. Documentation checklist — before committing, verify and update:
    • CLAUDE.md module map (if new files/modules)
    • .env.example (if new environment variables)
    • README.md project structure (if new files/modules)
    • ADR in docs/architecture/ (if architectural decisions were made)
    • Gotchas in CLAUDE.md (if new edge cases discovered)
    • Notes in the PRD (if implementation revealed business insights)
    • Runbook in docs/runbooks/ (if new operational procedures needed) Skip items that don't apply, but actively check each one.
  9. Commit with Conventional Commits format message

Always ask for plan confirmation before starting implementation.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 33 lines · 0 tokens per session scan A fea854471ded

Subscribe to this mod's changes

implement is a command published in the GitHub repository rtazima/claude-proj-blueprint (20 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 419 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.