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cc-learn: Skill for Claude Code

.agents/skills/mistake-log/SKILL.md

mistake-log is a skill for Claude Code, Codex from Muromi-Rikka/cc-learn. It costs 31 tokens per session (729 once invoked), scanned A, original, no licence file.

A skill that records and reviews past agent mistakes, with its description written in Chinese.

In plain words
What is it for?
Use it to log mistakes after they are corrected and review relevant past mistakes before similar tasks.
Why use it?
It helps an agent remember corrections and avoid repeating similar errors.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

This is Muromi-Rikka/cc-learn's own configuration. It tells Claude Code and Codex how to work on cc-learn itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cc-learn configures →

not rated 2repo 4mo ago A scan 31 tokens no licence
View source ↗ Muromi-Rikka/cc-learn claude-learn.pages.dev
Reuse

Borrowing it

Nothing to install: this file belongs to Muromi-Rikka/cc-learn. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Muromi-Rikka/cc-learn/main/.agents/skills/mistake-log/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/Muromi-Rikka/cc-learn

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for mistake-log

README.md
[![agentmods](https://agentmods.dev/badge/skills/muromi-rikka/cc-learn/mistake-log/github.svg)](https://agentmods.dev/skills/muromi-rikka/cc-learn/mistake-log)
Your own site
<a href="https://agentmods.dev/skills/muromi-rikka/cc-learn/mistake-log"><img src="https://agentmods.dev/badge/skills/muromi-rikka/cc-learn/mistake-log/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.

agentmods 80×15 button for mistake-log

Your own site · 80×15
<a href="https://agentmods.dev/skills/muromi-rikka/cc-learn/mistake-log"><img src="https://agentmods.dev/badge/skills/muromi-rikka/cc-learn/mistake-log.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 729 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00031 $0.00729
Opus 5.5 $0.00012 $0.00292
Sonnet 5.5 $0.00006 $0.00146
Haiku 4.5 $0.00003 $0.00073

Measured 2mo ago against content hash 37af4c9c0076, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mistake-log 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 2mo 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.

.agents/skills/mistake-log/SKILL.md · 94 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 2mo ago First seen · 94 lines · 31 tokens per session scan A 37af4c9c0076

Subscribe to this mod's changes

mistake-log is a skill published in the GitHub repository Muromi-Rikka/cc-learn (2 stars, last pushed 4mo ago), with no licence file. It adds 31 tokens to every session and 729 once invoked, about $0.0001 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.

Memory and context
Related

mistake-log compared with skills from other repositories

mistake-log next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
mistake-logMuromi-Rikka/cc-learnSkill24mo agononeA31Claude Code, Codex
knowledge-ingestopenclaw/openclawSkill394kyesterdayMITA80Claude Code, Codex
mem0-oss-to-platformmem0ai/mem0Skill68k2d agoApache-2.0A217Claude Code, Codex
forgetasgeirtj/system_prompts_leaksSkill71k2d agoCC0-1.0A74Claude Code, Codex
Cortexdanielmiessler/LifeOSSkill20kyesterdayMITA184Claude Code
memoryopensquilla/opensquillaSkill7.1k6d agoApache-2.0A44Claude Code, Codex
ha-data-storesshiwenwen/hope-agentSkill1.9kyesterdayMITA115Claude Code, Codex