What is cxxmcp AGENTS.md?

Repository-specific instructions for cxxmcp, a C++ software development kit for the Model Context Protocol. They define which documentation is authoritative, which files should not be changed casually, and how the package should be treated.

Use them when modifying, reviewing, building, or documenting the cxxmcp repository, especially around releases, dependencies, packaging, and conformance.

They help coding agents make changes that fit the project’s intended role and avoid editing generated files, vendored code, or other protected areas by mistake.

How caomengxuan666/cxxmcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to caomengxuan666/cxxmcp. 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/caomengxuan666/cxxmcp/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/caomengxuan666/cxxmcp

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/caomengxuan666/cxxmcp/agents-md/github.svg)](https://agentmods.dev/instructions/caomengxuan666/cxxmcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/caomengxuan666/cxxmcp/agents-md"><img src="https://agentmods.dev/badge/instructions/caomengxuan666/cxxmcp/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/caomengxuan666/cxxmcp/agents-md"><img src="https://agentmods.dev/badge/instructions/caomengxuan666/cxxmcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,073 This file is loaded in full into every session.

When invoked 2,073 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.

Model	Per session	Once invoked
Fable 5.1	$0.02073	$0.02073
Opus 5.5	$0.00829	$0.00829
Sonnet 5.5	$0.00415	$0.00415
Haiku 4.5	$0.00207	$0.00207

Measured 2mo ago against content hash b4d205e9e06c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cxxmcp AGENTS.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.

AGENTS.md · 196 lines

How it starts

The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Instructions

This repository is the cxxmcp C++ SDK for the Model Context Protocol. Treat it as an SDK and package project, not as a standalone MCP server, npm package, CLI, gateway, or hosted runtime.

Source Of Truth

Canonical documentation lives in README.md, README_zh.md, docs/, and the generated GitHub Pages site. Do not use GitHub Wiki as an authoritative documentation source.
Release gate details are in docs/release_gates.md; package consumption rules are in docs/package_consumption.md; conformance claims are in docs/conformance_evidence.md.
Dependency boundaries and update cadence are summarized in DEPENDENCY_POLICY.md; detailed release-time dependency review rules are in docs/dependency_policy.md.
Keep the repository root small. Prefer adding detailed material under docs/ unless a root file is a standard project file.

Do Not Touch Casually

Do not edit generated or local-output paths: out/, build*/, CMakeFiles/, Testing/, docs/doxygen/, .cache/, or IDE folders.
Do not change vendored dependencies under third_party/ unless the task is an explicit dependency upgrade. In third_party/httplib, treat httplib.h, LICENSE, and upstream README.md as the upstream payload; the minimal CMakeLists.txt and README.cxxmcp.md are cxxmcp-maintained wrapper notes.
Do not change .github/dependabot.yml casually. It is part of the dependency update policy, not a generic CI tuning file.
Do not change reference/ or RMCP fixture assumptions unless the work is about RMCP drift/conformance evidence.
Do not make SDK public headers expose runtime/gateway/tooling concepts such as app/runtime/gateway/CLI/profile/policy/discovery/import/export/trust types, or httplib. The sdk_boundary test enforces this.
Do not add FIXME, HACK, or XXX markers in first-party source, examples, templates, or tests. scripts/check_source_markers.py rejects them.

Public SDK Boundary

Read the full file on GitHub · 196 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 · 196 lines · 2,073 tokens per session scan A b4d205e9e06c

Subscribe to this mod's changes

cxxmcp AGENTS.md is an instructions file published in the GitHub repository caomengxuan666/cxxmcp (30 stars, last pushed 13d ago), licensed MIT. It adds 2,073 tokens to every session, about $0.0083 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 2026-08-30.

C and C++c-plus-plus cmake json-rpc mcp mcp-sdk

cxxmcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cxxmcp AGENTS.mdcaomengxuan666/cxxmcp	Instructions file	30	13d ago	MIT	A	2,073	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

cxxmcp: Instructions file for Codex