FactGrid (Renamed to FactReason) MCP Server

by factgridai Your server? Claim it

answering

FactGrid (Renamed to FactReason) is answering right now. Last checked 7 min ago. It exposes 11 tools. Last commit 14 Aug 2026.

Renamed to FactReason. Now published as io.github.factreason/factreason — please use that entry.

Uptime history 28 days of history · worst day 26%

28 days agonow

100.0%

Uptime 24h

93 of 93 checks

Tools

read from the server

204 ms

Response time

average over 24h

Stars

last commit 14 Aug 2026

What changed 57

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 14 August 2026. No other catalogue keeps this.

26 Aug a tool description was rewritten factreason_api_breaking_changes

25 Aug a tool description was rewritten factreason_api_breaking_changes

19 Aug a tool appeared factreason_create_key

19 Aug a tool changed version

18 Aug a tool description was rewritten factreason_package_upgrade_advisory

18 Aug a tool changed version

16 Aug 3 tool descriptions were rewritten4 times that day factreason_component_spec, factreason_integration_brief, factreason_package_upgrade_advisory

16 Aug 3 tools changed the parameters they ask for factreason_component_spec, factreason_integration_brief, factreason_package_upgrade_advisory

16 Aug a tool changed version2 times that day

14 Aug 10 tools appeared factreason_api_breaking_changes, factreason_api_schema, factreason_auth_playbook and 7 more

and 34 more, back to 14 August 2026

FactGrid (Renamed to FactReason) does not always answer

Over the last week it answered 93.6% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add factgrid --transport http https://factgrid.co.uk/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "factgrid": {
      "url": "https://factgrid.co.uk/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.factgrid]
url = "https://factgrid.co.uk/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "factgrid": {
      "url": "https://factgrid.co.uk/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "factgrid": {
      "url": "https://factgrid.co.uk/mcp"
    }
  }
}

Available tools 11

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

factreason

factreason_api_breaking_changes

Compare two versions of a third-party API and return breaking changes, including removed endpoints, parameter type changes, removed request body fields, and migration guides. Use factreason_package_upgrade_advisory for npm or PyPI packages.

factreason_api_schema

Search exact request and response schemas for third-party API endpoints. Pass service alone to list its indexed endpoints, add query to narrow by path or operation, or use query alone across services; returns matches or nearest services. Uses metered access and does not modify source data. Prefer factreason_integration_brief for one callable request.

factreason_auth_playbook

Get publisher-declared authentication schemes, scopes, rate-limit headers, and error codes for one third-party API. Returns a structured playbook or nearest service suggestions, and marks undocumented details as unstated rather than guessing. Uses metered access. Prefer factreason_integration_brief when assembling a complete API call.

factreason_component_spec

Look up electronics component pin assignments, voltage range, package, and alternatives. Pass exact partNumber for one component or query for a capability search; partNumber takes precedence if both are supplied. For exact lookups, set responseFormat="compact" for tokenizer-measured context savings; the backward-compatible default is "full". Uses metered access and returns matches or suggestions. Confirm critical values against the manufacturer datasheet.

factreason_create_key

Get a FactReason API key for yourself, instantly, with no human, no signup and no card. Returns a key carrying one-off trial credit that you can spend immediately on any tool. CALL THIS FIRST if you have no key, or as soon as any FactReason tool returns HTTP 402 Payment Required — then retry the original call with the key. The tool is free and is never metered. Supplying an email is optional and only affects whether trial credit is granted; a key is always issued either way.

factreason_create_topup_link

Create a Stripe Checkout URL for adding prepaid credit to the calling Bearer API key. This creates an external checkout session but does not charge a card. You CANNOT COMPLETE THE PAYMENT YOURSELF, so return the URL to a human, and credit is applied only after they complete payment. Use after HTTP 402 or when balance is low; the tool itself is not metered.

factreason_deprecation_scan

Scan publisher specifications for deprecated endpoints or parameters, sunset dates, and replacement operations. Omit filters for the catalogue-wide view, pass service to limit one API, and add endpoints to check selected paths. Uses metered access when findings exist. Use factreason_api_breaking_changes for broader version-to-version changes.

factreason_discover_api

Find third-party APIs for a capability when the provider is unknown. Supply a concise capability such as "sms" or "manage DNS"; returns ranked services, example endpoints, and a next step. Uses metered access. When the provider is already known, call factreason_integration_brief instead.

factreason_integration_brief

Compile one callable third-party API brief: base URL, auth scheme, required parameters and types, request body, and documented response codes. Service is required and endpoint optionally narrows the operation. Set responseFormat="compact" for tokenizer-measured context savings; the backward-compatible default returns the full brief plus compact form. Uses metered access. Prefer factreason_api_schema when exploring multiple endpoints.

factreason_package_upgrade_advisory

Compare two exact published npm or PyPI versions and return publisher-declared registry metadata changes, including yanks, exports, module format, runtime floors, peers, and licences, with before/after evidence. Set responseFormat="compact" for tokenizer-measured context savings; the backward-compatible default is "full". This is a read-only metered lookup; misses are never billed and every API key carries one-off trial credit. Use it for package metadata; use factreason_api_breaking_changes for a third-party HTTP API, and consult changelogs for behavioural changes.

factreason_subscribe_spec_changes

Create a persistent specification watch for one service; a Bearer API key is required and each key may hold up to 50 watches. Without webhookUrl, read future events from the polling endpoint; with a public HTTP(S) URL, FactReason sends signed POST callbacks after later spec changes. Duplicate or unsafe webhook registrations are rejected. This does not ingest a specification immediately.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

factgrid_api_breaking_changes

removed 14 Aug 2026

factgrid_api_schema

removed 14 Aug 2026

factgrid_auth_playbook

removed 14 Aug 2026

factgrid_component_spec

removed 14 Aug 2026

factgrid_create_topup_link

removed 14 Aug 2026

factgrid_deprecation_scan

removed 14 Aug 2026

factgrid_discover_api

removed 14 Aug 2026

factgrid_integration_brief

removed 14 Aug 2026

factgrid_package_upgrade_advisory

removed 14 Aug 2026

factgrid_subscribe_spec_changes

removed 14 Aug 2026

Endpoints

URL	Transport	State	Latency	Checked
https://factgrid.co.uk/mcp	streamable-http	answering	185 ms	7 min ago

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FactGrid (Renamed to FactReason) — questions

Answers built from our own checks of this server.

What can FactGrid (Renamed to FactReason) do?

It exposes 11 tools, read directly from the server on our last check. Among them: factreason_api_breaking_changes, factreason_api_schema, factreason_auth_playbook, factreason_component_spec, factreason_create_key, factreason_create_topup_link and 5 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is FactGrid (Renamed to FactReason) working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 93 of 93 checks got a reply (100.0%), average response time 204 ms. The bar chart above shows every period we have measured.

Did FactGrid (Renamed to FactReason) ever remove tools?

Yes. factgrid_api_breaking_changes, factgrid_api_schema, factgrid_auth_playbook, factgrid_component_spec and 6 more are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.

How do I connect FactGrid (Renamed to FactReason)?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does FactGrid (Renamed to FactReason) need an API key?

No. FactGrid (Renamed to FactReason) completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 11 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is FactGrid (Renamed to FactReason)?

It answers our handshake in 204 ms on average, which is faster than 67% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is FactGrid (Renamed to FactReason) open source?

Yes — it is published under the MIT licence and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.