tailscale-blade-mcp 0.7.0

MCP server for Tailscale network monitoring and security — devices, ACLs, DNS, keys, users, audit logs

tailscale-blade-mcp

An MCP server that gives AI agents structured access to Tailscale tailnets. Built for the Model Context Protocol with security visibility and token efficiency as first-class design goals.

Why this exists

Tailscale exposes a clean REST API (v2) for managing devices, ACL policies, DNS, auth keys, users, and audit logs. This MCP wraps it with the guardrails that automated agents need:

• Security-first tool set — 19 tools focused on what network security agents actually need: device inventory, key expiry auditing, ACL review + apply, route approval, DNS hygiene. Not a thin wrapper around every endpoint.
• Token-efficient output — compact pipe-delimited format. A 20-device tailnet in ~40 tokens per device. Devices flagged with KEY_EXPIRY_OFF, KEY_EXPIRED, UPDATE_AVAILABLE, UNAUTHORIZED, OFFLINE at a glance.
• Write-gated mutations — device authorization, tagging, key management, route approval, and ACL apply require explicit opt-in via TAILSCALE_WRITE_ENABLED=true. Destructive operations (delete device, revoke key) additionally require per-call confirm=true; ACL apply defaults to optimistic-concurrency (If-Match) so it won't silently clobber a concurrent edit.
• SecOps visibility — ACL policy summary shows groups, rules, SSH rules, and tag owners. Audit log shows who changed what. Key listing flags reusable keys and expiry status.

How this differs from other Tailscale MCPs

	tailscale-blade-mcp	HexSleeves/tailscale-mcp	jaxxstorm/tailscale-mcp
Focus	Monitoring + security (19 tools)	Management (~15 tools)	Read-only (~5 tools)
Design for	LLM agents (token-efficient)	Claude Code	General MCP
Output	Pipe-delimited, compact	Full JSON	Full JSON
Write safety	Dual-gated (env + confirm)	Direct writes	Read-only
Audit log	Yes	No	No
ACL summary	Parsed groups/rules/SSH/tags	Raw JSON	Raw JSON
Key hygiene	Flags reusable, expiry status	Basic listing	No
Marketplace	Sidereal certified	Standalone	Standalone

Quick start

# Install
uv pip install -e .

# Configure
export TAILSCALE_API_KEY="tskey-api-..."

# Run
tailscale-blade-mcp

19 tools, 5 categories

Info (1 tool)

Tool	Purpose	Token cost
ts_info	Health check — device counts, online/offline, key expiry warnings, settings, write gate	~100

Devices (3 tools)

Tool	Purpose	Token cost
ts_devices	All devices — hostname, OS, IP, online/offline, key expiry, tags, updates	~40/device
ts_device	Full detail — addresses, client version, key status, tags, user	~120
ts_device_routes	Routes — advertised subnets, approved/unapproved status	~30/route

Network (4 tools)

Tool	Purpose	Token cost
ts_dns	DNS — nameservers, MagicDNS, search paths, split DNS	~50
ts_acl	ACL policy — groups, rules, SSH rules, tag owners	~30/rule
ts_acl_validate	Validate a policy without applying it (write-gated)	~20
ts_acl_set	Apply a full ACL policy — validates first, optimistic-concurrency If-Match guard (write-gated; needs policy-file write scope)	~30

Users & Keys (3 tools)

Tool	Purpose	Token cost
ts_keys	Auth keys — ID, reusable/ephemeral/preauth flags, tags, expiry	~25/key
ts_users	Users — name, role, status, device count, online/last seen	~25/user
ts_webhooks	Webhooks — endpoint URL, event subscriptions	~25/webhook

Audit (1 tool)

Tool	Purpose	Token cost
ts_audit_log	Configuration changes — who, what, when	~25/entry

Write Operations (7 tools, gated)

ACL apply (ts_acl_set) is also write-gated; it's listed under Network with the other ACL tools.

Tool	Gate	Purpose
ts_authorize_device	write	Authorize or deauthorize a device
ts_set_tags	write	Set ACL tags on a device
ts_expire_device	write	Force key expiry — device must re-authenticate
ts_approve_routes	write	Approve advertised subnet routes
ts_create_key	write	Create an auth key (reusable/ephemeral/preauth)
ts_delete_key	write + confirm	Revoke an auth key permanently
ts_delete_device	write + confirm	Remove a device from the tailnet

Output format

macbook | os=mac | ip=100.100.1.1 | online | expires=2026-07-11 | id=n1234567890
nas | os=linux | ip=100.100.1.2 | online | KEY_EXPIRY_OFF | UPDATE_AVAILABLE | tags=server,infra | id=n9876543210
phone | os=iOS | ip=100.100.1.3 | OFFLINE | last=2d ago | expires=2026-05-01 | id=n5555555555

Authentication

Tailscale supports two auth methods:

Method	Token prefix	Best for
API access token	tskey-api-	Personal use, quick setup
OAuth client	Bearer token from client_credentials flow	Automation, scoped permissions

Both are passed via TAILSCALE_API_KEY. For OAuth, obtain a Bearer token first and pass that.

ACL write scope. Read tools work with any valid token. Applying an ACL (ts_acl_set) additionally requires the token to carry policy-file write scope — an OAuth client with the acl scope, or an API access token from an account that can edit the tailnet policy file. A read-only token will validate fine but return a 403 on apply, with a message pointing at the scope requirement.

Security model

Layer	Mechanism
Write gate	TAILSCALE_WRITE_ENABLED=true required for any mutation
Destructive confirm	ts_delete_key and ts_delete_device require confirm=true
ACL validate-before-apply	ts_acl_set always validates the policy and refuses to apply on failure
ACL optimistic concurrency	ts_acl_set sends If-Match (the current ETag) by default; a concurrent edit fails with a re-fetch message rather than clobbering. Bypass only via allow_overwrite_concurrent=true
Credential scrubbing	API keys, Bearer tokens, Authorization headers stripped from errors
Bearer auth	Optional TAILSCALE_MCP_API_TOKEN for HTTP transport
Tailnet auto-detect	Uses - shorthand by default — no tailnet name in config

Sidereal integration

{
  "mcpServers": {
    "tailscale": {
      "type": "stdio",
      "command": "uv",
      "args": ["--directory", "~/src/tailscale-blade-mcp", "run", "tailscale-blade-mcp"],
      "env": {
        "TAILSCALE_API_KEY": "tskey-api-...",
        "TAILSCALE_WRITE_ENABLED": "false"
      }
    }
  }
}

Webhook trigger patterns

• Key expiry approaching — ts_devices flags KEY_EXPIRY_OFF and expired keys for proactive rotation
• Unauthorized devices — ts_devices flags UNAUTHORIZED for approval workflows
• Route approval — ts_device_routes shows unapproved subnets for security review
• ACL changes — ts_audit_log tracks policy updates for compliance auditing
• Stale devices — ts_devices shows OFFLINE with last-seen time for cleanup workflows

Development

make install-dev    # Install with dev + test dependencies
make test           # Unit tests (mocked, no API access needed)
make check          # Lint + format + type-check
make run            # Start MCP server (stdio)

Architecture

src/tailscale_blade_mcp/
├── server.py       — FastMCP server, 19 @mcp.tool decorators
├── client.py       — TailscaleClient wrapping httpx async, credential scrubbing
├── formatters.py   — Token-efficient output (pipe-delimited, null omission, human units)
├── models.py       — TailscaleConfig, write gate, constants
└── auth.py         — Bearer token middleware for HTTP transport

Built with FastMCP and httpx.

License

MIT