What is pcp-mcp AGENTS.md?

Project instructions for developing pcp-mcp, an MCP server that exposes Performance Co-Pilot system metrics such as CPU, memory, disk, network, and processes. They describe the project structure, important files, and coding conventions.

Use them when adding MCP tools, changing the HTTP client or configuration, updating models and errors, modifying the command-line interface, or working on server setup.

They help an agent find the right files and follow the project's existing organization when making changes.

How major/pcp-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to major/pcp-mcp. 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/major/pcp-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/major/pcp-mcp

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/major/pcp-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/major/pcp-mcp/agents-md)

Your own site

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

Per session 1,278 This file is loaded in full into every session.

When invoked 1,278 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	$0.01278	$0.01278
Opus 5.5	$0.00511	$0.00511
Sonnet 5.5	$0.00256	$0.00256
Haiku 4.5	$0.00128	$0.00128

Measured 1mo ago against content hash 02e54def693f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pcp-mcp 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 1mo 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 · 144 lines

How it starts

The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.

PROJECT KNOWLEDGE BASE

Generated: 2026-01-18 Commit: bb3250e Branch: main

OVERVIEW

MCP server for Performance Co-Pilot (PCP) metrics. Exposes system performance data (CPU, memory, disk, network, processes) via Model Context Protocol tools and resources. Built on FastMCP 3.1+ with httpx async client for pmproxy REST API.

STRUCTURE

pcp-mcp/
├── src/pcp_mcp/           # Core package (see src/pcp_mcp/AGENTS.md)
│   ├── tools/             # MCP tools (see src/pcp_mcp/tools/AGENTS.md)
│   ├── utils/             # Extractors, builders
│   └── prompts/           # LLM system prompts
├── tests/                 # Test suite (see tests/AGENTS.md)
├── docs/                  # MkDocs source
└── site/                  # Generated docs (gitignored)

See subdirectory AGENTS.md files for detailed guidance on each module.

WHERE TO LOOK

Task	Location
Add new tool	`src/pcp_mcp/tools/`
Modify HTTP client	`src/pcp_mcp/client.py`
Change config	`src/pcp_mcp/config.py`
Add response model	`src/pcp_mcp/models.py`
Map exceptions	`src/pcp_mcp/errors.py`
CLI changes	`src/pcp_mcp/__init__.py`
Server setup	`src/pcp_mcp/server.py`

CONVENTIONS

Code Style

Line length: 100 chars
Docstrings: Google-style (enforced by ruff D rules)
Imports: from __future__ import annotations at top
Async: Default for I/O operations

Ruff Rules

E, F, I, UP, B, SIM, ASYNC, D — tests exempt from D rules

Type Checking

Tool: ty (not pyright, not mypy)
Target: Python 3.14
Mode: standard

Environment Variables

All prefixed with PCP_:

PCP_HOST, PCP_PORT — pmproxy connection
PCP_TARGET_HOST — remote pmcd host
PCP_USE_TLS, PCP_TIMEOUT — connection options
PCP_USERNAME, PCP_PASSWORD — auth (optional)

ANTI-PATTERNS

Counter Metrics (CRITICAL)

These are CUMULATIVE (since boot), NOT per-second rates:

kernel.all.cpu.*
disk.all.read_bytes, disk.all.write_bytes
network.interface.in.bytes, network.interface.out.bytes
proc.psinfo.utime, proc.psinfo.stime

Read the full file on GitHub · 144 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.

1mo ago First seen · 144 lines · 1,278 tokens per session scan A 02e54def693f

Subscribe to this mod's changes

pcp-mcp AGENTS.md is an instructions file published in the GitHub repository major/pcp-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 1,278 tokens to every session, about $0.0051 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 2026-08-31.

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

pcp-mcp: Instructions file for Codex