A Model Context Protocol server that provides access to the C++26 reference used by the cpp26-adapter add-on. Model Context Protocol is a standard way for an AI assistant to use external tools or data sources.

It supports C++26 guidance through a local Python service, provided the required environment setup is available.

It gives the assistant a configured reference service for C++26-related work instead of relying only on its built-in knowledge.

cpp26-ref — MCP server by parasxos

Install

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.

agentmods

npx agentmods add mcp/parasxos/cpp26-adapter/cpp26-ref

Clone the repo

git clone --depth 1 https://github.com/parasxos/cpp26-adapter

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

cpp26-ref 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 yesterday.

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.

.mcp.json · 13 lines

What it actually says

{
  "cpp26-ref": {
    "command": "python3",
    "args": [
      "-m",
      "cpp26_ref.server"
    ],
    "cwd": "${CLAUDE_PLUGIN_ROOT}/mcp-server/src",
    "env": {
      "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/mcp-server/src"
    }
  }
}

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.

yesterday First seen · 13 lines scan A 3b1d8e155300

Subscribe to this mod's changes

cpp26-ref is an MCP server published in the GitHub repository parasxos/cpp26-adapter (3 stars, last pushed 3mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. 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.

Code Generation Data and AI Languages ai-coding-assistant c-plus-plus claude-code claude-code-plugin cpp

cpp26-ref

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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