Borrowing it
Nothing to install: this file belongs to davidruzicka/mcp4openapi. 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/davidruzicka/mcp4openapi/main/CLAUDE.mdgit clone --depth 1 https://github.com/davidruzicka/mcp4openapiWrote 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/davidruzicka/mcp4openapi/claude-md)<a href="https://agentmods.dev/instructions/davidruzicka/mcp4openapi/claude-md"><img src="https://agentmods.dev/badge/instructions/davidruzicka/mcp4openapi/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/davidruzicka/mcp4openapi/claude-md"><img src="https://agentmods.dev/badge/instructions/davidruzicka/mcp4openapi/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 | $0.00313 | $0.00313 |
| Opus 5.5 | $0.00125 | $0.00125 |
| Sonnet 5.5 | $0.00063 | $0.00063 |
| Haiku 4.5 | $0.00031 | $0.00031 |
Grade A, and why
mcp4openapi 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.
What it actually says
lean-ctx — Context Engineering Layer
PREFER lean-ctx MCP tools over native equivalents for token savings:
| PREFER | OVER | Why |
|---|---|---|
ctx_read(path) |
Read / cat / head / tail | Session caching, 8 compression modes, re-reads cost ~13 tokens |
ctx_shell(command) |
Bash (shell commands) | Pattern-based compression for git, npm, cargo, docker, tsc |
ctx_search(pattern, path) |
Grep / rg | Compact context, token-efficient results |
ctx_tree(path, depth) |
ls / find | Compact directory maps with file counts |
ctx_read Modes
full— cached read (use for files you will edit)map— deps + API signatures (use for context-only files)signatures— API surface onlydiff— changed lines only (after edits)aggressive— syntax strippedentropy— Shannon + Jaccard filteringlines:N-M— specific range
File Editing
Use native Edit/StrReplace when available. If Edit requires Read and Read is unavailable,
use ctx_edit(path, old_string, new_string) — it reads, replaces, and writes in one MCP call.
NEVER loop trying to make Edit work. If it fails, switch to ctx_edit immediately.
Write, Delete have no lean-ctx equivalent — use them normally.
Always follow @AGENTS.md
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 First seen · 29 lines · 313 tokens per session scan A 0d8b95b18d5f
mcp4openapi CLAUDE.md is an instructions file published in the GitHub repository davidruzicka/mcp4openapi (0 stars, last pushed 4d ago), licensed MIT. It adds 313 tokens to every session, about $0.0013 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 2026-08-31.
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