Borrowing it
Nothing to install: this file belongs to isartor-ai/Isartor. 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/isartor-ai/Isartor/main/CLAUDE.mdgit clone --depth 1 https://github.com/isartor-ai/IsartorWrote 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/isartor-ai/isartor/claude-md)<a href="https://agentmods.dev/instructions/isartor-ai/isartor/claude-md"><img src="https://agentmods.dev/badge/instructions/isartor-ai/isartor/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/isartor-ai/isartor/claude-md"><img src="https://agentmods.dev/badge/instructions/isartor-ai/isartor/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 | $0.02383 | $0.02383 |
| Opus 5 | $0.01192 | $0.01192 |
| Sonnet 5 | $0.00477 | $0.00477 |
| Haiku 4.5 | $0.00238 | $0.00238 |
Grade A, and why
Isartor CLAUDE.md scanned grade A with 1 finding 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 10d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://localhost:8080/health How it starts
The opening of the file, as written. The whole thing — 307 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Isartor — Claude Code Guide
This file helps Claude Code understand the Isartor codebase quickly and make safe changes.
What Isartor is
Isartor is a pure-Rust LLM gateway / prompt firewall. It sits in front of coding tools and SDKs, tries to resolve requests locally, and only sends the hard ones to a cloud model.
Main request flow:
L1a exact cache -> L1b semantic cache -> L2 SLM triage -> L3 cloud provider
Supported client surfaces:
- Native API:
POST /api/chat - OpenAI-compatible API:
POST /v1/chat/completions - Anthropic-compatible API:
POST /v1/messages - Gemini-compatible API:
POST /v1beta/models/*:generateContent - Cursor / Kiro compatibility on
/v1/chat/completionsvia header-based format detection - CONNECT proxy for Copilot-style traffic:
src/proxy/connect.rs - MCP server for tool integrations:
isartor mcp
What matters most architecturally
1. src/main.rs is the real boot sequence
src/main.rs loads config, initializes telemetry, builds shared AppState, wires the Axum router, and optionally starts the CONNECT proxy.
Authenticated routes are wired in src/main.rs and intentionally go through the full middleware stack.
2. Middleware ordering is critical
The intended request execution order is:
body buffer -> monitoring -> auth -> cache -> slm triage -> context optimizer -> handler
Axum middleware wraps inside-out, so the last .layer(...) added runs first. Do not reorder casually.
3. BufferedBody is required
src/middleware/body_buffer.rs reads the request body once and stores a clone in request extensions. Downstream layers are expected to read from BufferedBody, not consume the stream directly.
This is especially important for:
- cache key extraction
- Anthropic/OpenAI compatibility handlers
- monitoring
- retries and middleware composition
4. AppState is the runtime wiring hub
src/state.rs owns:
- the shared
reqwest::Client - the L1 exact cache
- the semantic vector cache
- the in-process text embedder
- the configured L3 provider via
AppLlmAgent - the SLM client
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.
- 10d ago First seen · 307 lines · 2,383 tokens per session scan A ac3d4d3af30c
Isartor CLAUDE.md is an instructions file published in the GitHub repository isartor-ai/Isartor (21 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 2,383 tokens to every session, about $0.0119 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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