Borrowing it
Nothing to install: this file belongs to braintrustdata/braintrust-claude-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/braintrustdata/braintrust-claude-plugin/main/AGENTS.mdgit clone --depth 1 https://github.com/braintrustdata/braintrust-claude-pluginWrote 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.
[](https://agentmods.dev/instructions/braintrustdata/braintrust-claude-plugin/agents-md)<a href="https://agentmods.dev/instructions/braintrustdata/braintrust-claude-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/braintrustdata/braintrust-claude-plugin/agents-md/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.
<a href="https://agentmods.dev/instructions/braintrustdata/braintrust-claude-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/braintrustdata/braintrust-claude-plugin/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00261 | $0.00261 |
| Opus 5.5 | $0.00104 | $0.00104 |
| Sonnet 5.5 | $0.00052 | $0.00052 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
braintrust-claude-plugin AGENTS.md 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 1mo 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.
What it actually says
Agent guidelines
About this repository
This is the Braintrust Claude Code plugin marketplace - a repository that distributes Claude Code tracing for Braintrust.
Structure
claude-plugin/
├── .claude-plugin/
│ └── marketplace.json # Marketplace catalog (lists available plugins)
├── plugins/
│ └── trace-claude-code/ # Plugin: Session tracing to Braintrust
└── evals/ # Evaluation suite for Braintrust MCP behavior
Plugins
| Plugin | Description |
|---|---|
trace-claude-code |
Forwards Claude Code lifecycle hooks to bt trace hook --source claude-code; the shared daemon builds and delivers traces. |
Terminology
- Marketplace: A repository with a
marketplace.jsonthat catalogs multiple plugins for distribution - Plugin: An installable unit with its own
.claude-plugin/plugin.jsonmanifest
Style conventions
- Use sentence case for all text (capitalize first word only, except for proper nouns and code references)
- Keep criteria concise and specific
- Reference exact function/method names with proper casing (e.g.,
init_dataset(),Eval(),Factuality)
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.
- 1mo ago Changed · -3 lines · -96 tokens per session 2bb014037297
- 1mo ago First seen · 37 lines · 357 tokens per session scan A 6f61da683cca
braintrust-claude-plugin AGENTS.md is an instructions file published in the GitHub repository braintrustdata/braintrust-claude-plugin (21 stars, last pushed today), licensed MIT. It adds 261 tokens to every session, about $0.0010 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.