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/cloud-ru-tech/mcp-server-mattermost/agents-mdgit clone --depth 1 https://github.com/cloud-ru-tech/mcp-server-mattermostWhat 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 | $0.02355 | $0.02355 |
| Opus 5 | $0.01177 | $0.01177 |
| Sonnet 5 | $0.00471 | $0.00471 |
| Haiku 4.5 | $0.00235 | $0.00235 |
Grade A, and why
mcp-server-mattermost 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 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.
How it starts
The opening of the file, as written. The whole thing — 267 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
MCP server for Mattermost integration. Exposes Mattermost REST API operations as MCP tools for AI assistants (Claude Desktop, Cursor).
Architecture:
MCP Client (Claude Desktop, Cursor)
↓ (stdio JSON-RPC)
FastMCP Server
├── Tools Layer (channels, messages, posts, users, teams, files, bookmarks)
├── Pydantic Models (validation + schema generation)
└── MattermostClient (async HTTP with retry)
↓ (HTTPS)
Mattermost Server (REST API v4)
Documentation References
- FastMCP: https://gofastmcp.com/llms.txt - Use for implementation details when working with FastMCP
- Mattermost API: https://api.mattermost.com/ - REST API v4 reference
Commands
# Install dependencies
uv sync
# Run tests
uv run pytest
# Run specific test file
uv run pytest tests/test_config.py -v
# Lint
uv run ruff check src tests
# Format
uv run ruff format src tests
# Type check
uv run mypy src
# Run the server
uv run mcp-server-mattermost
Code Style
- Python 3.10+ (use
list[],dict[],X | Nonesyntax) - 120-character line length
- Google-style docstrings
- Type hints required (mypy strict mode)
- Two blank lines after imports
- Ruff with ALL rules enabled (see pyproject.toml for exceptions)
Key Source Files
src/mcp_server_mattermost/__init__.py- Package entry, exportsmain()and__version__src/mcp_server_mattermost/server.py- FastMCP instance creation, lifespan, FileSystemProvidersrc/mcp_server_mattermost/deps.py- Dependency injection providers (get_client)src/mcp_server_mattermost/auth.py- MattermostTokenVerifier for per-client token authsrc/mcp_server_mattermost/client.py- Async HTTP client with retry logicsrc/mcp_server_mattermost/config.py- Settings via pydantic-settings (env vars prefixedMATTERMOST_)src/mcp_server_mattermost/exceptions.py- Exception hierarchy (MattermostMCPErrorbase)src/mcp_server_mattermost/logging.py- Logging setup (stderr per MCP spec)src/mcp_server_mattermost/middleware.py- FastMCP middleware for error handlingsrc/mcp_server_mattermost/enums.py- Capability and ToolTag enums for tool metadatasrc/mcp_server_mattermost/tools/- MCP tool implementations by categorysrc/mcp_server_mattermost/models/- Pydantic models for validation
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 · 267 lines · 2,355 tokens per session scan A 7e9357daf264
mcp-server-mattermost AGENTS.md is an instructions file published in the GitHub repository cloud-ru-tech/mcp-server-mattermost (42 stars, last pushed 17d ago), licensed MIT. It adds 2,355 tokens to every session, about $0.0118 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 2026-08-30.
Other instructions, from other repositories
Basecamp-MCP-Server CLAUDE.md
Instructions for georgeantonopoulos/Basecamp-MCP-Server, covering claude.md, development commands, setup (one-time) - requires python 3.10+, option 2: using pip (if python 3.10+ already installed) and oauth authentication.
KingdeeMCP CLAUDE.md
Instructions for WaHaiLong/KingdeeMCP, covering claude.md, commands, install in development mode, run the mcp server directly and run with uvx (no install needed).
reddit-mcp-server AGENTS.md
Instructions for ismailsaoulaj/reddit-mcp-server, covering agents.md, commands, architecture, gotchas and git workflow.
skills-registry AGENTS.md
Instructions for nikships/skills-registry, covering repository guidance, layout and contracts and build and test.
bigquery-mcp CLAUDE.md
Instructions for pvoo/bigquery-mcp, covering claude.md, project overview, development commands, setup (recommended approach) and or manual setup.
mcp copilot-instructions.md
Copilot instructions for smplkit/mcp, covering using smplkit — write against it and operate it, the author + operate loop, writing code with the smplkit sdks, operating tools and how the management tools think.