Borrowing it
Nothing to install: this file belongs to Jaace/claude-model-advisor. 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/Jaace/claude-model-advisor/main/CLAUDE.mdgit clone --depth 1 https://github.com/Jaace/claude-model-advisorWrote 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/jaace/claude-model-advisor/claude-md)<a href="https://agentmods.dev/instructions/jaace/claude-model-advisor/claude-md"><img src="https://agentmods.dev/badge/instructions/jaace/claude-model-advisor/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/jaace/claude-model-advisor/claude-md"><img src="https://agentmods.dev/badge/instructions/jaace/claude-model-advisor/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 | $0.00584 | $0.00584 |
| Opus 5.5 | $0.00234 | $0.00234 |
| Sonnet 5.5 | $0.00117 | $0.00117 |
| Haiku 4.5 | $0.00058 | $0.00058 |
Grade A, and why
claude-model-advisor 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 1mo 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 — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
What this repo is
A Claude Code plugin that injects model/effort guidance at session start. It has no build system, no dependencies, and no tests — it's a shell script and a set of prompt/config files.
Plugin structure
.claude-plugin/plugins/model-advisor/
├── .claude-plugin/plugin.json # Plugin metadata (name, version, author)
├── hooks/hooks.json # Registers the SessionStart hook
├── hooks-handlers/session-start.sh # Core logic: outputs JSON with additionalContext
└── commands/model-check.md # Prompt for the /model-check skill
The marketplace.json at the root registers this repo as a marketplace source pointing to ./.claude-plugin/plugins/model-advisor.
How it works
hooks.jsonregisters aSessionStarthook that runssession-start.sh(5s timeout)session-start.shemits a JSON blob withhookSpecificOutput.additionalContext— this is the text Claude receives at session startmodel-check.mdis a skill prompt used for mid-session reassessment via/model-check
The model/effort guidance matrix
The core content this plugin delivers (defined in session-start.sh and model-check.md):
Model — what capability is needed?
haiku: simple lookups, quick edits, boilerplate, single-fact questionssonnet: coding, debugging, refactoring, explanations, any question with tradeoffs or nuanced judgmentopus: novel multi-system architecture, hard math, genuinely ambiguous open-ended design problems
Effort — how much reasoning is needed? (not applicable to Haiku; max is Opus only)
auto: Claude decides based on the task (default)low: established knowledge retrieval/explanation; shape of answer is knownmedium: some reasoning required; path is clearhigh: ambiguous problems, hard tradeoffs, novel synthesis, many interdependent constraintsmax(Opus 4.6 only): maximum thinking budget; for the hardest problems where cost is no concern
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.
- 1mo ago First seen · 56 lines · 584 tokens per session scan A 4fc7d2d8cc38
claude-model-advisor CLAUDE.md is an instructions file published in the GitHub repository Jaace/claude-model-advisor (2 stars, last pushed 6mo ago), licensed MIT. It adds 584 tokens to every session, about $0.0023 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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.