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mcp-tailscale: Instructions file for Codex

AGENTS.md

mcp-tailscale AGENTS.md is an instructions file for Codex, OpenCode from aplaceforallmystuff/mcp-tailscale. It costs 442 tokens per session, scanned A, original, MIT.

Repository instructions for a read-only MCP server that manages and monitors a Tailscale tailnet, which is a private network of connected devices.

In plain words
What is it for?
Use them when building, compiling, watching, or configuring the server, or when working with tools that list devices, show their status, check updates, and summarize the network.
Why use it?
They explain the required API credentials, development commands, architecture, and the six available device-monitoring tools.

Instructions file for CodexOpenCode

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

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

not rated 7repo 2mo ago A scan 442 tokens original MIT
View source ↗ aplaceforallmystuff/mcp-tailscale
Reuse

Borrowing it

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

Made for: Codex, OpenCode.

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Per session 442 This file is loaded in full into every session.
When invoked 442 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 $0.00442 $0.00442
Opus 5.5 $0.00177 $0.00177
Sonnet 5.5 $0.00088 $0.00088
Haiku 4.5 $0.00044 $0.00044

Measured 2mo ago against content hash 1e8dddaf0d48, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-tailscale 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 · 55 lines

What it actually says

AGENTS.md - mcp-tailscale

MCP server for managing and monitoring a Tailscale network (tailnet). Read-only.

Tech Stack

  • Language: TypeScript
  • Runtime: Node.js (ES modules)
  • Protocol: Model Context Protocol (MCP)
  • Build: TypeScript compiler (tsc)

Architecture

src/
  index.ts          # Server, Tailscale API client, all tool handlers inline

Development Commands

npm run build       # tsc
npm run watch       # tsc --watch

Environment Variables

Variable Required Description
TAILSCALE_API_KEY Yes API key from login.tailscale.com (starts with tskey-api-)
TAILSCALE_TAILNET No Tailnet name (defaults to - for current user)

Tools (6)

tailscale_list_devices, tailscale_get_device, tailscale_list_online_devices, tailscale_list_offline_devices, tailscale_check_updates, tailscale_device_summary

Key Patterns

  • Uses Server class from MCP SDK (low-level API with setRequestHandler)
  • Tools defined inline in the ListToolsRequestSchema handler
  • callTailscaleAPI() helper with Bearer token auth
  • tailscale_get_device searches by ID, name, or hostname
  • tailscale_device_summary aggregates by OS, online/offline, updates
  • TailscaleDevice interface for typed API responses

Constraints

  • Read-only: no device modifications, only queries
  • Exits at startup if TAILSCALE_API_KEY is not set
  • API keys expire (1-90 days configurable at Tailscale)

Pre-Publish

Run /publish-mcp before any npm publish — mandatory pipeline that handles tests, secret scan, sanitize, docs check, version bump, tag, push, and publish in strict order. Do not run npm publish directly.

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 · 55 lines · 442 tokens per session scan A 1e8dddaf0d48

Subscribe to this mod's changes

mcp-tailscale AGENTS.md is an instructions file published in the GitHub repository aplaceforallmystuff/mcp-tailscale (7 stars, last pushed 2mo ago), licensed MIT. It adds 442 tokens to every session, about $0.0018 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.

aiclaudemcpmesh-networkmodel-context-protocoltailscale
Related

mcp-tailscale AGENTS.md compared with instructions from other repositories

mcp-tailscale AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
mcp-tailscale AGENTS.mdaplaceforallmystuff/mcp-tailscaleInstructions file72mo agoMITA442Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode