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.
npx agentmods add instructions/vk0dev/agent-cost-mcp/claude-mdgit clone --depth 1 https://github.com/vk0dev/agent-cost-mcpWrote 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/vk0dev/agent-cost-mcp/claude-md)<a href="https://agentmods.dev/instructions/vk0dev/agent-cost-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/vk0dev/agent-cost-mcp/claude-md.svg" alt="Measured on agentmods" 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 | $0.00273 | $0.00273 |
| Opus 5 | $0.00137 | $0.00137 |
| Sonnet 5 | $0.00055 | $0.00055 |
| Haiku 4.5 | $0.00027 | $0.00027 |
Grade A, and why
agent-cost-mcp 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 3d 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.
What it actually says
AgentCost MCP
Stack
- TypeScript,
@modelcontextprotocol/sdk, Zod - Vitest for unit tests
Commands
- Install:
npm ci - Build:
npm run build - Test:
npm test - Lint:
npm run lint - Smoke test:
npm run smoke
Publishing
- See PUBLISHING.md for full marketplace playbook
- Version sync:
package.json,.claude-plugin/plugin.json,server.json,src/createServer.ts - Release:
git tag -a vX.Y.Z && git push --follow-tags→ CI publishes to npm
Architecture
src/createServer.ts— McpServer factory, exportscreateServer()andcreateSandboxServer()(Smithery)src/server.ts— CLI/stdio entry point, usescreateServer()src/tools/index.ts— 4 MCP tools registrationsrc/parser.ts— JSONL session log parsersrc/pricing.ts— config-driven pricing table
Notes
- Parses Claude Code JSONL session logs from
~/.claude/projects/... - Cost estimation is approximate and config-driven
- Local-first, zero network egress
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.
- 3d ago First seen · 30 lines · 273 tokens per session scan A d12d8f3b64eb
agent-cost-mcp CLAUDE.md is an instructions file published in the GitHub repository vk0dev/agent-cost-mcp (0 stars, last pushed 4d ago), licensed MIT. It adds 273 tokens to every session, about $0.0014 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.
Other instructions, from other repositories
manifest CLAUDE.md
Claude Code instructions for mnfst/manifest, covering manifest development guidelines, what manifest is, important: cloud mode always, 1. ensure the postgresdb container is running and 2. create a pristine database with a unique name.
manifest AGENTS.md
AGENTS.md instructions for mnfst/manifest, covering manifest agent guidelines and domain terminology.
openclaw-dashboard CLAUDE.md
Claude Code instructions for mudrii/openclaw-dashboard, covering go development standards, project constraints, internal packages, environment and commands.
openclaw-dashboard AGENTS.md
AGENTS.md instructions for mudrii/openclaw-dashboard, covering openclaw dashboard — codex instructions, default behavior, go development standards, project constraints and internal packages.
openclaw-dashboard GEMINI.md
Gemini CLI instructions for mudrii/openclaw-dashboard: This project has a knowledge graph at graphify-out/ with god nodes, community structure, and cross-file relationships.
voicegateway AGENTS.md
Instructions for mahimailabs/voicegateway, covering agents.md, project, commands, install (editable, with dev dependencies) and run tests.