← ~/library/ mcp /
Reverse engineer a feature with REA, evidence first
Point your agent at an app, a bundle or a binary, get how a feature works with the evidence behind it, then build your own version.
7 steps · 1370 words · Markdown format · Reviewed 2026-10-15
Tools: freeNoderan in Claude Codeself-checkdone checkchecked 2026-10-15Claude CodeCodexCursorGemini CLIGitHub CopilotDevin DesktopOpenCodeQwen CodeshellMCPon demandfrontiercodingbuilding
What the pill colors mean
- paidfree alternativefree what running it costs you beyond the file: a paid service, a paid service with a free route (hover it), or nothing
- DockerAPI key what you must bring: software, an account or a key
- ran in (tool)self-checkdone check evidence: we ran it in that tool, or the file carries its own check
- checked 2026-10-12 the day it was last checked against official docs; not a run
- Any AI where it works; each brief page says where to put it
- shellchat only what your AI app must be able to do
- on demand when your AI reads it
- frontier the smallest model it was written for
- codingbuilding what it is for, and the build stage it fits
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Put it here
Loads on demand: paste or attach it when the task comes up. To have it every session, put it where your tool reads instructions:
Claude Code
Save as CLAUDE.md in the project root, or .claude/CLAUDE.md. Other agents share the repo: put the shared rules in AGENTS.md and make CLAUDE.md one line, @AGENTS.md. Commit it. Start a new session: the file is read at launch.
Reload: new session (or /memory to open the files)
Check it loaded: /context lists the Memory files it read; /skills, /agents, /hooks list the rest; the InstructionsLoaded hook event fires once per loaded instruction file
Checked against the official page on 2026-10-12.
Codex
Save as AGENTS.md in the repo root. Codex concatenates AGENTS.md from the git root down to the working directory, closer wins. Commit it. Start a new session.
Reload: new session
Check it loaded: ask: Summarize the current instructions; codex status
Checked against the official page on 2026-10-12.
Cursor
Save as AGENTS.md in the repo root, or as .cursor/rules/<name>.mdc with alwaysApply: true in its frontmatter. Commit it. Reopen the project so it reindexes.
Reload: reopen the project
Check it loaded: Cursor Settings → Rules shows each rule and its status; no per-reply indicator
Checked against the official page on 2026-10-12.
Gemini CLI
Save as GEMINI.md in the project root, or add AGENTS.md to context.fileName in settings. Commit it. Run /memory refresh.
Reload: /memory refresh (one official page says /memory reload)
Check it loaded: the footer counts context files; /memory show prints them; /memory list
Checked against the official page on 2026-10-12.
GitHub Copilot
Save as .github/copilot-instructions.md, or as AGENTS.md in the repo root. Commit it. Open a new chat.
Reload: new chat
Check it loaded: expand References under the reply; VS Code: Chat: Open Customizations; CLI: /instructions
Checked against the official page on 2026-10-12.
Devin Desktop
Save as AGENTS.md in the repo root, or as .devin/rules/<name>.md with trigger: always_on. Commit it.
Reload: new conversation
Check it loaded: Customizations → Rules panel
Checked against the official page on 2026-10-12.
OpenCode
Save as AGENTS.md in the project root. Commit it. Start a new session.
Reload: new session
Check it loaded: none documented: ask it to repeat one rule from the file
Checked against the official page on 2026-10-12.
Qwen Code
Save as QWEN.md in the project root. Commit it. Start a new session.
Reload: new session
Check it loaded: /memory shows the load order
Checked against the official page on 2026-10-12.