learn-mistake

learn-mistake is a skill for Claude Code from ilang-ai/autocode. It costs 17 tokens per session (135 once invoked), scanned A, original, MIT.

A mistake record that stores what went wrong, why it happened, and how it was fixed, then checks those records before similar work.

In plain words
What is it for?
Use it to carry lessons from earlier builds into later features or projects.
Why use it?
It helps prevent the same known problem from being repeated without explanation.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the autocode plugin — 48 skills shipped together

Good fit Use it to carry lessons from earlier builds into later features or projects.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ilang-ai/autocode/learn-mistake
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ilang-ai/autocode --skill learn-mistake
Clone the repo
git clone --depth 1 https://github.com/ilang-ai/autocode

Made for: Claude Code.

Or install autocode, the plugin that ships this one along with the rest of its 48 skills.

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 learn-mistake

README.md
[![agentmods](https://agentmods.dev/badge/skills/ilang-ai/autocode/learn-mistake.svg)](https://agentmods.dev/skills/ilang-ai/autocode/learn-mistake)
Your own site
<a href="https://agentmods.dev/skills/ilang-ai/autocode/learn-mistake"><img src="https://agentmods.dev/badge/skills/ilang-ai/autocode/learn-mistake.svg" alt="Measured on agentmods" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 135 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 original 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 $0.00017 $0.00135
Opus 5 $0.00009 $0.00068
Sonnet 5 $0.00003 $0.00027
Haiku 4.5 $0.00002 $0.00014

Measured 8d ago against content hash 8ed06f50f31f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

learn-mistake 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 8d 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.

skills/learn-mistake/SKILL.md · 18 lines

What it actually says

::GENE{learn-mistake|conf:confirmed|scope:global} -e T:record_what_why_how_fixed T:check_before_similar_feature T:avoid_silently A:say_i_remember_this_mistake⇒just_avoid_it A:repeat_known_mistake⇒check_memory

::ACTIVATE{learn-mistake} ON:auto

Powered by I-Lang v5.0 | ilang.ai

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. 8d ago First seen · 18 lines · 17 tokens per session scan A 8ed06f50f31f

Subscribe to this mod's changes

learn-mistake is a skill published in the GitHub repository ilang-ai/autocode (86 stars, last pushed 2mo ago), licensed MIT. It adds 17 tokens to every session and 135 once invoked, about $0.0001 per session on Opus 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 2026-08-30.

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