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excalidraw-mcp: Instructions file for Codex

AGENTS.md

excalidraw-mcp AGENTS.md is an instructions file for Codex, OpenCode from cmd8/excalidraw-mcp. It costs 327 tokens per session, scanned A, original, MIT.

A project instruction file for an Excalidraw MCP server, a program that lets AI tools work with Excalidraw diagrams. It records coding preferences and rules for writing and testing TypeScript changes.

In plain words
What is it for?
Use it when changing the server or adding tests around its public API. It guides choices such as avoiding unnecessary type casts and running the project's formatting and changed-test commands.
Why use it?
It keeps code changes consistent with the repository's style and reminds contributors which checks must run after completing work. It also prevents tests from being written for code paths that real callers cannot reach.

Instructions file for CodexOpenCode

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

This is cmd8/excalidraw-mcp's own configuration. It tells Codex and OpenCode how to work on excalidraw-mcp 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 excalidraw-mcp configures →

not rated 5repo 11mo ago A scan 327 tokens original MIT
View source ↗ cmd8/excalidraw-mcp npmjs.com
Reuse

Borrowing it

Nothing to install: this file belongs to cmd8/excalidraw-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/cmd8/excalidraw-mcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/cmd8/excalidraw-mcp

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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Per session 327 This file is loaded in full into every session.
When invoked 327 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 $0.00327 $0.00327
Opus 5.5 $0.00131 $0.00131
Sonnet 5.5 $0.00065 $0.00065
Haiku 4.5 $0.00033 $0.00033

Measured 2mo ago against content hash 118f6e9d1875, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

excalidraw-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 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 · 31 lines

What it actually says

IMPORTANT

  • PREFER to keep things in one function unless composable or reusable
  • DO NOT do unnecessary destructuring of variables
  • DO NOT use else statements unless necessary
  • DO NOT use try/catch if it can be avoided
  • AVOID using as Type casting
  • AVOID try/catch where possible
  • AVOID else statements
  • AVOID using any type
  • AVOID let statements
  • AVOID typeof x === 'string' checks when TypeScript already knows the type; use x != null for optional fields
  • USE typeof checks only for defensive parsing of untrusted JSON or when checking optional number/boolean fields (where truthiness fails for 0/false)
  • PREFER single word variable names where possible
  • ALWAYS run pnpm fix and pnpm test:changed after you finish the task
  • ALWAYS check with the user to approve the commit message before you run git commit

TESTING

  • PREFER testing the public API over internal helper functions
  • ALWAYS analyze actual call sites to understand what inputs are possible before writing tests
  • DO NOT test unreachable code paths (e.g., input validation for formats that callers never produce)
  • PREFER meaningful coverage over 100% coverage
  • ALWAYS follow this example file and folder structure when creating tests:
src/some_dir
├── moduleToTest.ts
└── tests
    └── moduleToTest.tests.ts
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. 2mo ago First seen · 31 lines · 327 tokens per session scan A 118f6e9d1875

Subscribe to this mod's changes

excalidraw-mcp AGENTS.md is an instructions file published in the GitHub repository cmd8/excalidraw-mcp (5 stars, last pushed 11mo ago), licensed MIT. It adds 327 tokens to every session, about $0.0013 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.

excalidrawmcpmcp-servermcpservermodelcontextprotocol
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