What is mcp-lite AGENTS.md?

A repository guide for mcp-lite, a TypeScript project managed as a Bun monorepo—a repository containing multiple related packages.

Use it when building, checking, linting, testing, or adding code to the core library, command-line tool, playground, or examples.

It tells agents where code and tests live and which commands and style rules apply across the packages.

How fiberplane/mcp-lite configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to fiberplane/mcp-lite. 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/fiberplane/mcp-lite/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/fiberplane/mcp-lite

Made for: Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/fiberplane/mcp-lite/agents-md/github.svg)](https://agentmods.dev/instructions/fiberplane/mcp-lite/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/fiberplane/mcp-lite/agents-md"><img src="https://agentmods.dev/badge/instructions/fiberplane/mcp-lite/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/fiberplane/mcp-lite/agents-md"><img src="https://agentmods.dev/badge/instructions/fiberplane/mcp-lite/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 622 This file is loaded in full into every session.

When invoked 622 The same file — it is already loaded in full.

Security scan A 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00622	$0.00622
Opus 5.5	$0.00249	$0.00249
Sonnet 5.5	$0.00124	$0.00124
Haiku 4.5	$0.00062	$0.00062

Measured 2mo ago against content hash c1a73fad502e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-lite AGENTS.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 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- PRs: include description, motivation, and any breaking changes. Link issues. Add before/after snippets or curl examples for protocol changes.

AGENTS.md · 46 lines

How it starts

The opening of the file, as written. The whole thing — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Guidelines

Project Structure & Module Organization

Root: Bun monorepo with workspaces in packages/* and playground.
Core library: packages/core
- Source: packages/core/src
- Tests: packages/core/tests/integration/*.test.ts
- Build scripts: packages/core/scripts
Create MCP Lite CLI: packages/create-mcp-lite
- Source: packages/create-mcp-lite/src
- Tests: packages/create-mcp-lite/tests/**/*.test.ts
- Build scripts: packages/create-mcp-lite/scripts
Playground app: playground/minimal-server.ts (Hono + MCP HTTP transport)
Examples: examples/*
- These can all run with bun, and test integration of packages/core (mcp-lite) with various other libraries.

Build, Test, and Development Commands

Install deps: bun install
Build all packages: bun run build
Type-check all: bun run typecheck
Lint/format (Biome): bun run lint
Test all (Bun): bun test
Per-package example: bun run --filter=core build (or cd packages/core && bun run build)

Coding Style & Naming Conventions

Language: TypeScript (ESM). Prefer explicit exports.
Formatting: enforced by Biome; run bun run lint before pushing.
Files: kebab-case for multi-word files (e.g., transport-http.ts).
Classes: PascalCase (e.g., McpServer). Functions/vars: camelCase.
Types/interfaces: PascalCase; constants SCREAMING_SNAKE_CASE.

Testing Guidelines

Framework: Bun.
Location: place tests under packages/<name>/tests/** and name as *.test.ts.
Run: bun test (all). Run all test files with "foo" or "bar" in the file name bun test foo bar. Run all test files, only including tests whose names includes "baz" bun test --test-name-pattern baz.
Write integration tests for public behavior (HTTP transport, JSON-RPC). Favor black-box tests over internals.

Commit & Pull Request Guidelines

Commits: concise, imperative subject; scope by package when relevant (e.g., core: add StreamableHttpTransport validation).
PRs: include description, motivation, and any breaking changes. Link issues. Add before/after snippets or curl examples for protocol changes.
Requirements: green tests, lint clean, typecheck clean. Update docs (README.md, examples) when APIs change.

Read the full file on GitHub · 46 lines

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.

2mo ago First seen · 46 lines · 622 tokens per session scan A c1a73fad502e

Subscribe to this mod's changes

mcp-lite AGENTS.md is an instructions file published in the GitHub repository fiberplane/mcp-lite (118 stars, last pushed 1y ago), licensed MIT. It adds 622 tokens to every session, about $0.0025 per session on Opus 5.5. 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.

mcp-lite AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mcp-lite AGENTS.mdfiberplane/mcp-lite	Instructions file	118	1y ago	MIT	A	622	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

mcp-lite: Instructions file for Codex