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.
npx agentmods add rules/davidruzicka/mcp4openapi/cursorrulesgit clone --depth 1 https://github.com/davidruzicka/mcp4openapiWhat 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 | $0.00183 | $0.00183 |
| Opus 5 | $0.00092 | $0.00092 |
| Sonnet 5 | $0.00037 | $0.00037 |
| Haiku 4.5 | $0.00018 | $0.00018 |
Grade A, and why
cursorrules 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.
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 |
Cached, 8 compression modes |
ctx_shell(command) |
Shell |
Pattern compression |
ctx_search(pattern, path) |
Grep |
Compact results |
ctx_tree(path, depth) |
ls / find |
Directory maps |
ctx_edit(path, old_string, new_string) |
Edit (when Read unavailable) |
Search-and-replace without native Read |
Edit files: use native Edit/StrReplace if available. If Edit requires Read and Read is unavailable, use ctx_edit. Write, Delete, Glob — use normally. NEVER loop on Edit failures — switch to ctx_edit immediately.
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.
- yesterday First seen · 15 lines · 183 tokens per session scan A 18788da53813
cursorrules is a cursor rule published in the GitHub repository davidruzicka/mcp4openapi (0 stars, last pushed 14d ago), licensed MIT. It adds 183 tokens to every session, about $0.0009 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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