Borrowing it
Nothing to install: this file belongs to jonathondouglasyager-debug/claude-error-learning. 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/jonathondouglasyager-debug/claude-error-learning/master/CLAUDE.mdgit clone --depth 1 https://github.com/jonathondouglasyager-debug/claude-error-learningWrote 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/instructions/jonathondouglasyager-debug/claude-error-learning/claude-md)<a href="https://agentmods.dev/instructions/jonathondouglasyager-debug/claude-error-learning/claude-md"><img src="https://agentmods.dev/badge/instructions/jonathondouglasyager-debug/claude-error-learning/claude-md/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/instructions/jonathondouglasyager-debug/claude-error-learning/claude-md"><img src="https://agentmods.dev/badge/instructions/jonathondouglasyager-debug/claude-error-learning/claude-md.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 | $0.02188 | $0.02188 |
| Opus 5.5 | $0.00875 | $0.00875 |
| Sonnet 5.5 | $0.00438 | $0.00438 |
| Haiku 4.5 | $0.00219 | $0.00219 |
Grade A, and why
claude-error-learning CLAUDE.md 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.
How it starts
The opening of the file, as written. The whole thing — 248 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Error Learning Plugin
Automated error detection, fix tracking, and prevention for Claude Code via hooks.
Repo: https://github.com/jonathondouglasyager-debug/claude-error-learning
The Complete Loop
ERROR OCCURS FIX APPLIED FUTURE SESSIONS
│ │ │
▼ ▼ ▼
┌──────────┐ ┌──────────┐ ┌──────────┐
│ Capture │ │ Capture │ │ Prevent │
│ Error │────────────────▶│ Fix │─────────────────▶ │ + Teach │
│ │ same session │ │ curator pairs │ │
└──────────┘ same tool type └──────────┘ error → fix └──────────┘
Result: Claude makes mistake once → learns the fix → never makes that mistake again. 70-90% token reduction per prevented error.
Smart Detection (v2)
The curator analyzes error messages to create precise blocking rules:
| Error Type | Signature | Blocked | Example |
|---|---|---|---|
| Bad flag | bad_flag_ls_--xyz |
Only that flag | ls --xyz blocked, ls -la works |
| Command not found | cmd_not_found_choco |
Only that command | choco blocked |
| Path not found | path_not_found_* |
SKIPPED | Won't learn (environmental) |
| Permission denied | permission_* |
SKIPPED | Won't learn (environmental) |
This prevents false positives like blocking all ls commands when only one bad flag failed.
Plugin Architecture
| Component | File | Hook | Purpose |
|---|---|---|---|
| Error Logger | hooks/error-logger.py |
PostToolUseFailure | Captures errors with awaiting_fix flag |
| Fix Tracker | hooks/fix-tracker.py |
PostToolUse (Bash) | Links fixes to prior errors |
| Command Validator | hooks/command-validator.py |
PreToolUse (Bash) | Blocks + shows learned fix |
| Error Curator | hooks/error-curator.py |
SessionEnd | Pairs errors with fixes |
| Slash Command | commands/error-learning.md |
- | Management interface |
| Pattern Injector | hooks/pattern-injector.py |
UserPromptSubmit | TF-IDF ranking + natural-language injection |
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.
- 2mo ago First seen · 248 lines · 2,188 tokens per session scan A 2f2aabed848d
claude-error-learning CLAUDE.md is an instructions file published in the GitHub repository jonathondouglasyager-debug/claude-error-learning (3 stars, last pushed 6mo ago), licensed MIT. It adds 2,188 tokens to every session, about $0.0088 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.