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tokencost-dev: Instructions file for Claude Code

CLAUDE.md

tokencost-dev CLAUDE.md is an instructions file for Claude Code from atriumn/tokencost-dev. It costs 288 tokens per session, scanned A, original, MIT.

Project instructions for tokencost, an MCP server that looks up current language-model prices and estimates usage costs.

In plain words
What is it for?
Use it when developing or running tokencost, looking up model pricing, estimating token costs, comparing models, or refreshing its price data.
Why use it?
It gives an agent the project structure, available operations, data source, build commands, and caching details needed to work on the server.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is atriumn/tokencost-dev's own configuration. It tells Claude Code how to work on tokencost-dev itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything tokencost-dev configures →

not rated 1repo 3d ago A scan 288 tokens original MIT
View source ↗ atriumn/tokencost-dev tokencost.dev
Reuse

Borrowing it

Nothing to install: this file belongs to atriumn/tokencost-dev. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/atriumn/tokencost-dev/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/atriumn/tokencost-dev

Made for: Claude Code.

Wrote this? Show the measurements

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Per session 288 This file is loaded in full into every session.
When invoked 288 The same file — it is already loaded in full.
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 $0.00288 $0.00288
Opus 5.5 $0.00115 $0.00115
Sonnet 5.5 $0.00058 $0.00058
Haiku 4.5 $0.00029 $0.00029

Measured 2mo ago against content hash a955f42a8965, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tokencost-dev 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.

CLAUDE.md · 34 lines

What it actually says

tokencost — LLM Pricing Oracle MCP Server

Overview

Lightweight MCP server that pulls real LLM pricing data from LiteLLM's community-maintained registry and exposes it as tools any MCP-compatible client can query.

Architecture

  • TypeScript, ESM ("type": "module")
  • @modelcontextprotocol/sdk with stdio transport
  • Data source: LiteLLM model_prices_and_context_window.json
  • Fuzzy model name matching via fuse.js

File Structure

  • src/index.ts — Server setup, stdio transport, handler wiring
  • src/tools.ts — Tool definitions (inputSchema) + executeTool dispatch
  • src/pricing.ts — Fetch, cache, normalize LiteLLM data
  • src/search.ts — Fuzzy model name matching

Tools Exposed

  1. get_model_details — Look up pricing/capabilities for a model
  2. calculate_estimate — Estimate cost for a given token count
  3. compare_models — Filter and compare models by provider/context/mode
  4. refresh_prices — Force re-fetch pricing data

Build & Run

npm run build
npm start

Cache

  • In-memory with 24h TTL
  • Disk fallback at .cache/prices.json
  • Background refresh on startup
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. 2mo ago First seen · 34 lines · 288 tokens per session scan A a955f42a8965

Subscribe to this mod's changes

tokencost-dev CLAUDE.md is an instructions file published in the GitHub repository atriumn/tokencost-dev (1 stars, last pushed 3d ago), licensed MIT. It adds 288 tokens to every session, about $0.0012 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.

LLMclaudelitellmmcpmodel-context-protocolopenai
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