dejavu

dejavu is a skill for Claude Code from cmg8431/claude-dejavu. It costs 51 tokens per session (441 once invoked), scanned A, original, MIT.

A review workflow for learned rules that help a coding assistant avoid repeating mistakes. It displays each rule's state, evidence, confidence, and how often it has been triggered.

In plain words
What is it for?
Use it to inspect learned antipatterns, approve proposed rules, apply accepted rules, and review their sources and effectiveness.
Why use it?
It makes proposed and existing rules easier to judge before applying them to CLAUDE.md. You can decide which rules to keep, edit, or remove.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: mentions CLAUDE.md.

Part of the claude-dejavu plugin — 6 skills, 4 hooks shipped together

Good fit Use it to inspect learned antipatterns, approve proposed rules, apply accepted rules, and review their sources and effectiveness.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cmg8431/claude-dejavu/dejavu
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 cmg8431/claude-dejavu --skill dejavu
Clone the repo
git clone --depth 1 https://github.com/cmg8431/claude-dejavu

Made for: Claude Code.

Or install claude-dejavu, the plugin that ships this one along with the rest of its 6 skills, 4 hooks.

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 dejavu

README.md
[![agentmods](https://agentmods.dev/badge/skills/cmg8431/claude-dejavu/dejavu/github.svg)](https://agentmods.dev/skills/cmg8431/claude-dejavu/dejavu)
Your own site
<a href="https://agentmods.dev/skills/cmg8431/claude-dejavu/dejavu"><img src="https://agentmods.dev/badge/skills/cmg8431/claude-dejavu/dejavu/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 dejavu

Your own site · 80×15
<a href="https://agentmods.dev/skills/cmg8431/claude-dejavu/dejavu"><img src="https://agentmods.dev/badge/skills/cmg8431/claude-dejavu/dejavu.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 441 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 $0.00051 $0.00441
Opus 5 $0.00026 $0.00220
Sonnet 5 $0.00010 $0.00088
Haiku 4.5 $0.00005 $0.00044

Measured 11d ago against content hash 2db341985df1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

dejavu 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 11d 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.

plugin/skills/dejavu/SKILL.md · 58 lines

What it actually says

claude-dejavu: Review Learned Rules

You are helping the user review antipattern rules that claude-dejavu has detected from past sessions.

Steps

  1. First, run the dejavu binary to get current status:
claude-dejavu stats --path "$(pwd)"
  1. Then list all rules:
claude-dejavu list --path "$(pwd)"
  1. Present the rules to the user in a clear format:

For each rule, show:

  • Rule ID and status (active/proposed/dead)
  • Rule text — what Claude should do differently
  • Detector type — how it was discovered (revert cycle / repeated error / silent fix)
  • Confidence and fire count
  • Action options: keep, edit, or remove
  1. If there are proposed rules, ask the user to approve them:
┌─ Proposed rule r-001 ─ [repeated error] ─────────┐
│ "This project uses pnpm, not npm."                │
│ Evidence: 4 sessions, last 2 weeks                │
│ Confidence: 0.91                                  │
│ Apply? [y/n/edit]                                 │
└───────────────────────────────────────────────────┘
  1. If the user approves, apply rules to CLAUDE.md:
claude-dejavu scan --path "$(pwd)"
  1. After applying, show a summary of what changed in CLAUDE.md.

Important

  • Never modify rules without user confirmation
  • Dead rules (no fires in 14+ days) should be suggested for removal
  • Rules with high fire counts are valuable — highlight them
  • If no rules exist yet, explain that dejavu needs more sessions to detect patterns
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. 11d ago First seen · 58 lines · 51 tokens per session scan A 2db341985df1

Subscribe to this mod's changes

dejavu is a skill published in the GitHub repository cmg8431/claude-dejavu (2 stars, last pushed 3mo ago), licensed MIT. It adds 51 tokens to every session and 441 once invoked, about $0.0003 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 2026-08-31.

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