# Toolpin (toolpin.dev)

Probes public MCP servers daily and pins hashes of their tool definitions to flag silent changes.

- Atlas card: https://inite.ai/en/atlas/toolpin.dev
- Site: https://toolpin.dev
- For: Developers and teams who depend on public MCP servers and need to know when their tool definitions change
- Categories: dev
- Use 0/100 · alive 100/100

## Used for

- Check whether a public MCP server's tools have changed
- Get alerted when a watched server goes unreachable or recovers
- Verify an MCP server's tool claims before installing it

## Price

- from 9 USD/month, free plan (read 2026-10-26 on https://toolpin.dev/pricing)

## For developers

- OpenAPI: https://toolpin.dev/openapi.json (13 paths)
- API docs: https://toolpin.dev/api
- MCP server: dev.toolpin/toolpin (namespace; open on 2026-10-26, 6 tools)
- Read 2026-10-26

## MCP server, measured daily

Server: https://toolpin.dev/mcp, checked every day since 2026-10-26 (1 checks).

- Answered: measuring, 1 daily checks so far
- Median first answer: 139 ms
- Sign-in: none
- Context its tool definitions take: about 679 tokens (6 tools)
- Tool definitions: C, 69/100
- Failing "params_described": 5 of 6 tools
- Failing "annotations": 6 of 6 tools
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-26

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Source: INITE Atlas, https://inite.ai/en/atlas/toolpin.dev. JSON: https://inite.ai/api/atlas/toolpin.dev. MCP: https://inite.ai/api/mcp (atlas_lookup).