Borrowing it
Nothing to install: this file belongs to jamesbrink/mcp-coroot. 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/jamesbrink/mcp-coroot/main/CLAUDE.mdgit clone --depth 1 https://github.com/jamesbrink/mcp-corootWrote 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/jamesbrink/mcp-coroot/claude-md)<a href="https://agentmods.dev/instructions/jamesbrink/mcp-coroot/claude-md"><img src="https://agentmods.dev/badge/instructions/jamesbrink/mcp-coroot/claude-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/jamesbrink/mcp-coroot/claude-md"><img src="https://agentmods.dev/badge/instructions/jamesbrink/mcp-coroot/claude-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 | $0.01901 | $0.01901 |
| Opus 5.5 | $0.00760 | $0.00760 |
| Sonnet 5.5 | $0.00380 | $0.00380 |
| Haiku 4.5 | $0.00190 | $0.00190 |
Grade A, and why
mcp-coroot CLAUDE.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.
How it starts
The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Internal notes for working on this repository.
Documentation policy
This project keeps exactly two prose documents: README.md (public) and
CLAUDE.md (this file). LICENSE and CHANGELOG.md are also allowed. Do not
add other markdown files; fold new documentation into one of these.
Testing standards
- Test files are named
test_<module>.pyand mirror the module they cover. - Never use suffixes like
test_final_*.py,test_new_*.pyortest_all_remaining_*.py. Consolidate into the existing file instead. - Tests run against a scripted fake Coroot (
tests/conftest.py), never a live instance and never the network.
Layout
src/mcp_coroot/
config.py Settings, read from the environment once at startup
cli.py Argument parsing, logging to stderr, transport selection
client/
base.py Pooled httpx2 transport, lazy login, body decoding
errors.py Exception types mapped from Coroot's status codes
ids.py ApplicationId parsing and path-segment encoding
timerange.py Relative, epoch and ISO time parsing
accounts.py projects.py overview.py applications.py incidents.py
dashboards.py configuration.py metrics.py
client.py CorootClient, composing the above
server/
app.py build_server, lifespan, annotation constants
state.py AppState, project resolution, StateHolder
errors.py guard decorator turning client errors into ToolError
compact.py Chart, flame graph and budget reduction
instructions.py The instructions string sent to clients
resources.py prompts.py
tools/ One module per domain, registered by register_all
Architecture decisions
SDK. The official mcp 2.x SDK (mcp.server.mcpserver.MCPServer), not
jlowin fastmcp. It ships the same day as the spec revisions it implements,
masks unexpected exceptions instead of leaking them to the model, and pre-parses
JSON strings for list and object parameters, which removes the string-coercion
workarounds 0.1.x carried. Note that mcp.server.fastmcp no longer exists in
mcp 2.x, and that fastmcp>=4 depends on mcp>=2 itself.
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 · -95 lines · +132 tokens per session 80218b1504ec
- 2mo ago First seen · 250 lines · 1,769 tokens per session scan A 536ffb2c8fc4
mcp-coroot CLAUDE.md is an instructions file published in the GitHub repository jamesbrink/mcp-coroot (16 stars, last pushed 1mo ago), licensed MIT. It adds 1,901 tokens to every session, about $0.0076 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.
mcp-coroot CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-coroot CLAUDE.mdjamesbrink/mcp-coroot | Instructions file | 16 | 1mo ago | MIT | A | 1,901 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |