Borrowing it
Nothing to install: this file belongs to pvliesdonk/kroki-mcp. 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/pvliesdonk/kroki-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/pvliesdonk/kroki-mcpWrote 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/pvliesdonk/kroki-mcp/claude-md)<a href="https://agentmods.dev/instructions/pvliesdonk/kroki-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/pvliesdonk/kroki-mcp/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/pvliesdonk/kroki-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/pvliesdonk/kroki-mcp/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 | $0.00432 | $0.00432 |
| Opus 5 | $0.00216 | $0.00216 |
| Sonnet 5 | $0.00086 | $0.00086 |
| Haiku 4.5 | $0.00043 | $0.00043 |
Grade A, and why
kroki-mcp 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 10d 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
kroki-mcp
MCP server wrapping a self-hosted Kroki instance for diagram rendering.
Project Structure
src/kroki_mcp/
mcp_server.py -- FastMCP server factory + auth wiring (don't modify)
config.py -- env var loading; KROKI_MCP_KROKI_URL + read_only
cli.py -- CLI entry point (serve command)
_server_deps.py -- lifespan: httpx.AsyncClient → Kroki
_server_tools.py -- render_diagram, list_diagram_types
_server_resources.py -- kroki://health resource
_server_prompts.py -- diagram_helper prompt
_diagram_types.py -- static registry of Kroki diagram types
Conventions
- Python 3.11+
uvfor package management,rufffor linting/formatting (line length 88)hatchlingbuild backend- Conventional commits:
feat:,fix:,docs:,refactor:,test:,chore: - Google-style docstrings on all public functions
logging.getLogger(__name__)throughout, noprint()- Type hints everywhere
Key Patterns
- Service object is
httpx.AsyncClientwithbase_urlpointed at Kroki - All tools are read-only — Kroki is a rendering service with no write operations
- Diagram type validation uses static
DIAGRAM_TYPESregistry in_diagram_types.py - Auth:
_build_bearer_auth()+_build_oidc_auth()called increate_server(); MultiAuth when both set _ENV_PREFIXinconfig.pyisKROKI_MCP— controls all env var names- FastMCP 3.x API: use
server._lifespan_manager()(nottest_client()) in tests;result.content[0]for tool results;result.contents[0].contentfor resource results
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.
- 10d ago First seen · 37 lines · 432 tokens per session scan A 46cc50afb234
kroki-mcp CLAUDE.md is an instructions file published in the GitHub repository pvliesdonk/kroki-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 432 tokens to every session, about $0.0022 per session on Opus 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 2026-08-31.
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