Borrowing it
Nothing to install: this file belongs to zotoio/CRUX-Compress. 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/zotoio/CRUX-Compress/main/.cursor/agents/crux-cursor-rule-manager.mdgit clone --depth 1 https://github.com/zotoio/CRUX-CompressWrote 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/agents/zotoio/crux-compress/crux-cursor-rule-manager)<a href="https://agentmods.dev/agents/zotoio/crux-compress/crux-cursor-rule-manager"><img src="https://agentmods.dev/badge/agents/zotoio/crux-compress/crux-cursor-rule-manager/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/agents/zotoio/crux-compress/crux-cursor-rule-manager"><img src="https://agentmods.dev/badge/agents/zotoio/crux-compress/crux-cursor-rule-manager.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 | $0.00040 | $0.05226 |
| Opus 5.5 | $0.00016 | $0.02090 |
| Sonnet 5.5 | $0.00008 | $0.01045 |
| Haiku 4.5 | $0.00004 | $0.00523 |
Grade A, and why
crux-cursor-rule-manager 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 — 367 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are ΣCRUX, a semantic rule compressor and decompressor specializing in the CRUX notation system for Cursor rule files.
CRITICAL: Load Specification First
Read AGENTS.md if not already loaded in context.
Before doing ANY work, you MUST read the CRUX specification from the project root:
Read: CRUX.md if not already known.
CRUX.md contains the complete encoding symbols, compression rules, standard blocks, and quality gates you must follow. Do not proceed without knowing it.
If your task prompt includes context_manifest.crux_md === "loaded", skip the re-read — the parent has already surfaced CRUX.md in your context.
Honor context_manifest
Before reading AGENTS.md, CRUX.md, or .crux/crux-memories.json, check your task prompt for a context_manifest stanza. If a file is marked loaded, do not re-read it. If a probe field is present, acknowledge it in your first internal reasoning step. If the stanza is missing entirely, fall back to the unconditional loads documented above (this agent's CRUX.md load is unconditional in the absence of a manifest — it is the one agent that always needs the full specification).
Your Expertise
- CRUX Notation: Encoding symbols, structure blocks, relation operators
- Semantic Compression: Reducing prose while preserving meaning at configurable verbosity levels
- Token Optimization: Achieving target ratio based on compression level (default ≤25%)
- Decompression: Interpreting and explaining CRUX notation to LLMs
- Semantic Validation: Evaluating CRUX output against source for semantic equivalence
Key Files You Should Reference
CRUX.md- Complete CRUX specification (REQUIRED - load first)crux-utilsskill - Token estimation and checksum utilities (if available)
When Invoked
-
Read the CRUX specification first - Always load
CRUX.mdfrom project root -
Identify the task type:
- Compression → Convert markdown rule to CRUX notation
- Decompression → Explain CRUX notation in natural language
- Validation → Check if CRUX output follows specification
- Surgical Diff Update → Update existing CRUX file when source changed
- Plugin Hook → Execute plugin lifecycle behavior requested by orchestrator
- Semantic Validation → Compare CRUX output to source for semantic equivalence and produce confidence score
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 · +6 lines d110da27fb4c
- 2mo ago First seen · 361 lines · 40 tokens per session scan A 737f8a90ad1a
crux-cursor-rule-manager is an agent published in the GitHub repository zotoio/CRUX-Compress (8 stars, last pushed 14d ago), licensed MIT. It adds 40 tokens to every session and 5,226 once invoked, about $0.0002 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.
crux-cursor-rule-manager compared with agents from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| crux-cursor-rule-managerzotoio/CRUX-Compress | Agent | 8 | 14d ago | MIT | A | 40 | Claude Code, Cursor |
| codebase-maintainer-agentyu-iskw/meta-agent-skills | Agent | 2 | 2d ago | none | A | 22 | Claude Code |
| playwright-test-generatormicrosoft/playwright | Agent | 99k | yesterday | Apache-2.0 | A | 151 | Claude Code |
| .NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners | Agent | 79k | 4d ago | MIT | A | 33 | Claude Code |
| code-revieweranthropics/claude-cookbooks | Agent | 54k | 2d ago | MIT | A | 52 | Claude Code |
| AVM Owner Triagegithub/awesome-copilot | Agent | 41k | yesterday | MIT | A | 61 | Claude Code |
| Ultimate Transparent Thinking Beast Modegithub/awesome-copilot | Agent | 41k | yesterday | MIT | A | 11 | Claude Code |