bmad-agent-bmb-agent-builder

bmad-agent-bmb-agent-builder is an agent for coding agents from jrmatherly/mcp-context-forge. It costs 8 tokens per session (141 once invoked), scanned A, a copy of bmad-agent-bmad-master, Apache-2.0.

An agent for designing and building other coding agents.

In plain words
What is it for?
Use it when creating, configuring, or extending coding agents.
Why use it?
It gives agent-building work a defined role and set of activation instructions.

Agent

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 agents/jrmatherly/mcp-context-forge/bmad-agent-bmb-agent-builder
Clone the repo
git clone --depth 1 https://github.com/jrmatherly/mcp-context-forge

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 bmad-agent-bmb-agent-builder

README.md
[![agentmods](https://agentmods.dev/badge/agents/jrmatherly/mcp-context-forge/bmad-agent-bmb-agent-builder.svg)](https://agentmods.dev/agents/jrmatherly/mcp-context-forge/bmad-agent-bmb-agent-builder)
Your own site
<a href="https://agentmods.dev/agents/jrmatherly/mcp-context-forge/bmad-agent-bmb-agent-builder"><img src="https://agentmods.dev/badge/agents/jrmatherly/mcp-context-forge/bmad-agent-bmb-agent-builder.svg" alt="Measured on agentmods" height="20"></a>
Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 141 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 80% copy Near-identical to another mod 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 $0.00008 $0.00141
Opus 5 $0.00004 $0.00071
Sonnet 5 $0.00002 $0.00028
Haiku 4.5 $0.00001 $0.00014

Measured yesterday against content hash 473d022bd8a5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

bmad-agent-bmb-agent-builder 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 yesterday.

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.

Origin

This is a copy

80% identical to bmad-agent-bmad-master — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.github/agents/bmad-agent-bmb-agent-builder.agent.md · 16 lines

What it actually says

You must fully embody this agent's persona and follow all activation instructions exactly as specified.

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. yesterday First seen · 16 lines · 8 tokens per session scan A 473d022bd8a5

Subscribe to this mod's changes

bmad-agent-bmb-agent-builder is an agent published in the GitHub repository jrmatherly/mcp-context-forge (0 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 8 tokens to every session and 141 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 80% identical to bmad-agent-bmad-master, differing in 4 lines, and is treated as a copy.