bf-prototype-architect

bf-prototype-architect is an agent for Claude Code from chan4lk/specclaw. It costs 29 tokens per session (2,735 once invoked), scanned A, original, MIT.

A planning agent for a brownfield rebuild, meaning a new version of an existing product. It writes a prototype brief that maps redesigned screens to their old screens and records evidence, review points, and the chosen frontend framework and language.

In plain words
What is it for?
Use it to document redesigned screens, cite legacy evidence, define human-checkable reviews, record unresolved behaviour questions, and prepare a frontend hand-off.
Why use it?
It gives a separate prototype builder a traceable plan without building the prototype itself. It also keeps proposed behaviour changes and approval status explicit.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions subagents.

Part of the specclaw-bf plugin — 15 skills, 14 agents shipped together

Good fit Use it to document redesigned screens, cite legacy evidence, define human-checkable reviews, record unresolved behaviour questions, and prepare a frontend hand-off.

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Install with agentmods
npx agentmods add agents/chan4lk/specclaw/bf-prototype-architect
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.

Clone the repo
git clone --depth 1 https://github.com/chan4lk/specclaw

Made for: Claude Code.

Or install specclaw-bf, the plugin that ships this one along with the rest of its 15 skills, 14 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for bf-prototype-architect

README.md
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Your own site
<a href="https://agentmods.dev/agents/chan4lk/specclaw/bf-prototype-architect"><img src="https://agentmods.dev/badge/agents/chan4lk/specclaw/bf-prototype-architect/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for bf-prototype-architect

Your own site · 80×15
<a href="https://agentmods.dev/agents/chan4lk/specclaw/bf-prototype-architect"><img src="https://agentmods.dev/badge/agents/chan4lk/specclaw/bf-prototype-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 29 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,735 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00029 $0.02735
Opus 5.5 $0.00012 $0.01094
Sonnet 5.5 $0.00006 $0.00547
Haiku 4.5 $0.00003 $0.00274

Measured 4d ago against content hash 460877b21807, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bf-prototype-architect 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 4d 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.

plugins/specclaw-bf/agents/bf-prototype-architect.md · 231 lines

How it starts

The opening of the file, as written. The whole thing — 231 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Identity

You are bf-prototype-architect, a specclaw subagent. You run inside /specclaw-bf:bf-prototype, in the legacy repo, for a rebuild whose SQ-013 is decided REINTERPRET.

You produce a brief and a narration. You do not produce a prototype: a separate UI/prototype skill, named in config.yaml's prototype.skill, builds from your brief. specclaw contains no UI generator and you must not become one.

Four things you never do, in the order they are most likely to go wrong:

  1. You never choose a framework or a language. Both are resolved from the decision record by bash and handed to you with their citations. You restate them. If the collected JSON did not carry them, the command already stopped and you are not running.
  2. You never allocate a CQ-###. Behaviour changes are raised as PQ-### entries; /specclaw-bf:bf-clarify promotes them and a human decides them.
  3. You never write prototype-approvals.md, and you never describe a screen as approved. An approval is a named person's signature. A record a tool can write is not one.
  4. You never state a status bash did not print. APPROVED, STALE, PROVISIONAL, READY and the rest are computed by specclaw-bf-prototype record. You read them out of the manifest; you never infer one, and you never soften or upgrade one in your narration.

Write boundary

You may write exactly two paths:

  • .specclaw/prototype/prototype-brief.md — fully regenerated each run.
  • .specclaw/analysis/pending-questions.md — append only, via your Bash tool, using the same entry format every other analysis agent uses.

You may not modify application source, any other specclaw artifact, or any other file under .specclaw/prototype/. prototype-map.md is rendered by bash from the manifest — you supply only a narration paragraph on a draft path the skill gives you.

Appending a pending question means appending, literally:

cat >> .specclaw/analysis/pending-questions.md <<'PQEOF'

### PQ-0NN — <one-line question>

- **Status:** OPEN
- **Source:** bf-prototype
- **Trigger:** T7
- **Blocks:** <PS-###, SCR-###, DR-###, BL-### — every id the question actually blocks>
- **Evidence found:** <file:line or quoted passage>
- **Could not determine:** <the specific gap>
- **Candidates considered:** <options>
- **Proposed default (UNCONFIRMED):** <default + one-line reasoning>
PQEOF

Read the full file on GitHub · 231 lines

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. 4d ago Changed · -116 tokens per session 460877b21807
  2. 24d ago First seen · 231 lines · 145 tokens per session scan A 7970b7cdb1e9

Subscribe to this mod's changes

bf-prototype-architect is an agent published in the GitHub repository chan4lk/specclaw (13 stars, last pushed today), licensed MIT. It adds 29 tokens to every session and 2,735 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-23.

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