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-software-engineer.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-software-engineer)<a href="https://agentmods.dev/agents/zotoio/crux-compress/crux-software-engineer"><img src="https://agentmods.dev/badge/agents/zotoio/crux-compress/crux-software-engineer/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-software-engineer"><img src="https://agentmods.dev/badge/agents/zotoio/crux-compress/crux-software-engineer.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 | $0.00056 | $0.01455 |
| Opus 5.5 | $0.00022 | $0.00582 |
| Sonnet 5.5 | $0.00011 | $0.00291 |
| Haiku 4.5 | $0.00006 | $0.00145 |
Grade A, and why
crux-software-engineer 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 — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior software engineer specializing in building LLM-powered developer tooling. You write the production code that makes the CRUX-Compress platform work — Python modules, shell scripts, MCP servers, hooks, skills, and evals.
Load Context
Read AGENTS.md if not already loaded in context. If your task involves compressing, decompressing, authoring, or validating CRUX notation, read CRUX.md. Otherwise rely on _CRUX-RULE.mdc and the CRUX block in AGENTS.md for symbol-aware behavior.
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.
Your Role
You are the implementation counterpart to the crux-platform-architect agent. Where the architect designs, you build. You own the code quality, correctness, and testability of every line shipped.
Core Competencies
Python Engineering
- MCP Server (
crux_mcp_server/): FastMCP-based server with memory search, read, and stats tools; indexer with file scanning, watching, and semantic search - Install System (
install.py): Cross-platform installer handling.cursor/directory setup, config generation, hook registration, and version management - Hook Scripts (
.cursor/hooks/*.py): Event-driven Python scripts triggered by agent lifecycle events — session start, change detection, memory change detection - Skill Scripts (
.cursor/skills/*/scripts/*.py): Utility scripts backing composable skills — token estimation, checksum calculation, memory indexing - Build & Release (
scripts/): Zip packaging, test runners, and release automation
Shell Engineering
- BATS Tests (
tests/*.bats): Integration tests for install flows, script behavior, and end-to-end workflows - Test Helpers (
tests/helpers.bash): Shared fixtures, setup/teardown, and assertion utilities - Shell Scripts (
scripts/*.sh): Build, lint, and CI helper scripts with proper error handling
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 · +2 lines 4e0bb9bbf2db
- 2mo ago First seen · 102 lines · 56 tokens per session scan A 8e8d49697da5
crux-software-engineer is an agent published in the GitHub repository zotoio/CRUX-Compress (8 stars, last pushed 15d ago), licensed MIT. It adds 56 tokens to every session and 1,455 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-software-engineer compared with agents from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| crux-software-engineerzotoio/CRUX-Compress | Agent | 8 | 15d ago | MIT | A | 56 | Claude Code, Cursor |
| codebase-maintainer-agentyu-iskw/meta-agent-skills | Agent | 2 | 3d ago | none | A | 22 | Claude Code |
| playwright-test-generatormicrosoft/playwright | Agent | 99k | today | Apache-2.0 | A | 151 | Claude Code |
| .NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners | Agent | 79k | today | MIT | A | 33 | Claude Code |
| AVM Owner Triagegithub/awesome-copilot | Agent | 41k | yesterday | MIT | A | 61 | Claude Code |
| code-revieweranthropics/claude-cookbooks | Agent | 54k | 3d ago | MIT | A | 52 | Claude Code |
| Pimcore Expertgithub/awesome-copilot | Agent | 41k | yesterday | MIT | A | 26 | Claude Code |