What is twist-ai AGENTS.md?

Project-specific instructions for developing Twist AI’s MCP server, a service that lets language models call tools. They describe where new tools must be registered and what testing and documentation they require.

Use them when adding or changing MCP tools in the Twist AI project. They cover tool files, registration points, parameter tests, build and type checks, documentation, and direct tool execution.

They reduce the chance that a new tool is registered in one place but missed in another, or shipped without the expected tests and documentation.

How Doist/twist-ai configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Doist/twist-ai. 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/Doist/twist-ai/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Doist/twist-ai

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/doist/twist-ai/agents-md/github.svg)](https://agentmods.dev/instructions/doist/twist-ai/agents-md)

Your own site

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

Per session 419 This file is loaded in full into every session.

When invoked 419 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	$0.00419	$0.00419
Opus 5.5	$0.00168	$0.00168
Sonnet 5.5	$0.00084	$0.00084
Haiku 4.5	$0.00042	$0.00042

Measured 2mo ago against content hash fde59a0404a0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

twist-ai 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 · 52 lines

What it actually says

Twist AI MCP Server - Development Guidelines

Adding a New Tool

When adding a new tool, it must be registered in all of these locations:

src/utils/tool-names.ts — add tool name constant
src/tools/<tool-name>.ts — create tool definition
src/mcp-server.ts — import, register with registerTool(), and add to LLM instructions string
src/index.ts — import and add to both the tools object and the named exports
scripts/run-tool.ts — import and add to the tools record
src/tools/__tests__/tool-annotations.test.ts — add annotation expectation entry
src/tools/__tests__/<tool-name>.test.ts — create test file

Testing Requirements

When adding new tool parameters:

Add comprehensive test coverage for new fields
Test setting values
Test clearing values (if applicable)
Verify build and type checking pass
Run full test suite (all tests must pass)

Documentation Requirements

When adding new tool features:

Update tool schema descriptions in the source file
Update src/mcp-server.ts tool usage guidelines
Add tests demonstrating the feature
Include examples in descriptions where helpful

Running Tools Directly

Use scripts/run-tool.ts to execute any tool without the MCP server:

npx tsx scripts/run-tool.ts <tool-name> '<json-args>'
npx tsx scripts/run-tool.ts --list  # list all tools

Examples:

npx tsx scripts/run-tool.ts user-info '{}'
npx tsx scripts/run-tool.ts search-content '{"query":"project update"}'
npx tsx scripts/run-tool.ts fetch-inbox '{"workspaceId":12345}'

Requires TWIST_API_KEY in .env (and optionally TWIST_BASE_URL).

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.

2mo ago First seen · 52 lines · 419 tokens per session scan A fde59a0404a0

Subscribe to this mod's changes

twist-ai AGENTS.md is an instructions file published in the GitHub repository Doist/twist-ai (3 stars, last pushed yesterday), licensed MIT. It adds 419 tokens to every session, about $0.0017 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.

twist-ai AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
twist-ai AGENTS.mdDoist/twist-ai	Instructions file	3	yesterday	MIT	A	419	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,649	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode ai-customization.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	1,907	GitHub Copilot

twist-ai: Instructions file for Codex