tfmcp: Instructions file for Codex

AGENTS.md

tfmcp AGENTS.md is an instructions file for Codex, OpenCode from nwiizo/tfmcp. It costs 668 tokens per session, scanned A, original, MIT.

A repository guide for coding agents working on tfmcp, a Rust server that lets Terraform operations be used through the MCP protocol. It documents the project layout, coding rules, and commands for checking changes.

In plain words
What is it for?
Use it to understand where Rust components belong, follow implementation rules, and run formatting, linting, and test checks before commits.
Why use it?
It gives an agent the project-specific rules and verification steps before it edits or commits code. This reduces mistakes such as ignored warnings, unsafe error handling, or broken links in the documentation structure.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is nwiizo/tfmcp's own configuration. It tells Codex and OpenCode how to work on tfmcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything tfmcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to nwiizo/tfmcp. 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/nwiizo/tfmcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/nwiizo/tfmcp

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.

agentmods badge for tfmcp AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/nwiizo/tfmcp/agents-md/github.svg)](https://agentmods.dev/instructions/nwiizo/tfmcp/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/nwiizo/tfmcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nwiizo/tfmcp/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.

agentmods 80×15 button for tfmcp AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/nwiizo/tfmcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nwiizo/tfmcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 668 This file is loaded in full into every session.
When invoked 668 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00668 $0.00668
Opus 5.5 $0.00267 $0.00267
Sonnet 5.5 $0.00134 $0.00134
Haiku 4.5 $0.00067 $0.00067

Measured 26d ago against content hash 477f251ea56e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tfmcp 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 26d 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 · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

tfmcp is a Rust-based MCP server for Terraform operations using the RMCP SDK.

Quick Reference

# Quality checks (run before commits)
rtk cargo fmt --all -- --check
rtk proxy env RUSTFLAGS=-Dwarnings cargo clippy --all-targets --all-features
rtk cargo test --locked --all-features

Project Structure

Module Purpose
src/core/ Main application logic
src/mcp/ RMCP server, tool routing, protocol handling, and transports
src/terraform/ Terraform CLI integration
src/registry/ Terraform Registry API client

Key Rules

  • No mocks: Use real implementations only
  • No dead code: Remove unused code immediately
  • No warnings: RUSTFLAGS="-Dwarnings" in CI
  • No .unwrap(): Use proper error handling

Documentation

The .agents/rules, .agents/skills, and .agents/docs directories are symlinks to the shared files under .claude/. Keep these links when updating the content. Apply the development guidelines to implementation work and the signal integrity rules to structural analysis and review.

File Contents
rules/quality-commands.md Build, test, CI commands
rules/development-guidelines.md Code style, security rules
rules/grading-integrity.md Comparable diagnostics and evidence-based interpretation
docs/architecture.md Module structure, features
docs/configuration.md Environment variables, Docker
docs/mcp-tools.md Tool and resource reference
docs/troubleshooting.md Known issues, debugging
skills/release/SKILL.md Release process

Development Skills

Skill Use
analyze Coupling reports, health, hotspots, and comparisons
review Module boundaries and shared-knowledge review
refactor Behavior-preserving structural changes
similarity Duplicate-code assessment
e2e-test Isolated MCP and Terraform verification

Read the full file on GitHub · 65 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.

  1. 26d ago First seen · 65 lines · 668 tokens per session scan A 477f251ea56e

Subscribe to this mod's changes

tfmcp AGENTS.md is an instructions file published in the GitHub repository nwiizo/tfmcp (372 stars, last pushed 7d ago), licensed MIT. It adds 668 tokens to every session, about $0.0027 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 2026-10-03.

Related

Other instructions, from other repositories

flow-like copilot-instructions.md

Copilot instructions for Rheosoph/flow-like, covering flow-like wasm node development — rust, project overview, build & test, architecture and pin types.

Rheosoph/flow-like · 1,349 tokens

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

next.js AGENTS.md

AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

vercel/next.js · 7,461 tokens

vscode oss-third-party-notices.instructions.md

Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).

microsoft/vscode · 5,262 tokens

langchain AGENTS.md

AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.

langchain-ai/langchain · 4,680 tokens

vscode copilot-instructions.md

Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).

microsoft/vscode · 2,731 tokens