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Give coding agents procedural memory that only keeps what passed tests

MuscleMemory remembers how a task was done only when tests passed, and trusts it after two more passing sessions. Claude Code reusing skills Codex learned used 43.5% fewer input tokens.

Free tier30 minutesIntermediateSource linked

Source

@maaaz7n on X · 2026-10-13

Written in our own words. Credit to the original author. Link checked 2026-10-16.

What they did

MuscleMemory remembers how a task was done only when tests passed, and trusts it after two more passing sessions. Claude Code reusing skills Codex learned used 43.5% fewer input tokens.

Result (as claimed)

Open source; 43.5% fewer input tokens in the author's test.

Tools they used

Claude CodeOpenAI Codex

Cost: Claude Code: free plan, paid from $17/mo; OpenAI Codex: free plan, paid from $8/mo. Checked 2026-10-14.

Set it up

  1. Pick a contained repo or task

    Start on a branch or side project where mistakes are cheap.

  2. Install and configure

    Set up Claude Code, OpenAI Codex. Read what it can run on your machine and limit permissions where possible.

  3. Run it on a real task

    Give it a well-scoped issue and let it work. Review the diff like any pull request.

  4. Add guardrails

    Keep tests and CI in the loop, and never let an agent push to main or touch production secrets unattended.

Copy the full setup prompt

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Goal: Give coding agents procedural memory that only keeps what passed tests
What the original author did: MuscleMemory remembers how a task was done only when tests passed, and trusts it after two more passing sessions. Claude Code reusing skills Codex learned used 43.5% fewer input tokens.
Reported result (as claimed by the author): Open source; 43.5% fewer input tokens in the author's test.
Source: https://x.com/maaaz7n/status/2110068079506186483
Tools they used: Claude Code, OpenAI Codex
Category: Dev & ops

Please:
1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like).
2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure.
3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data.
4. Finish with a checklist to run it again next time.

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