Connect FactReason and your agent gets 11 tools, among them factreason_api_breaking_changes, factreason_api_schema, factreason_auth_playbook. It answers at https://www.factreason.com/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 11 September 2026; the last check, on 22 October 2026, succeeded.
Check exact npm/PyPI upgrades for evidence-backed breaking changes; query APIs and components.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
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. Inputs: service, fromVersion, toVersion |
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. Us Inputs: service, query |
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 guessin Inputs: service |
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 resp Inputs: partNumber, query, responseFormat |
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 Inputs: email |
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 i Inputs: amountUsd |
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 Inputs: service, endpoints |
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 k Inputs: capability |
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" f Inputs: service, endpoint, responseFormat |
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" Inputs: registry, name, from, to, responseFormat |
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 sign Inputs: serviceName, webhookUrl |
Every block below points at https://www.factreason.com/mcp. Pick your client and copy.
claude mcp add --transport http factreason https://www.factreason.com/mcp
{
"mcpServers": {
"factreason": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://www.factreason.com/mcp"]
}
}
}{
"mcpServers": {
"factreason": {
"url": "https://www.factreason.com/mcp"
}
}
}{
"servers": {
"factreason": {
"type": "http",
"url": "https://www.factreason.com/mcp"
}
}
}{
"context_servers": {
"factreason": {
"url": "https://www.factreason.com/mcp"
}
}
}{
"mcpServers": {
"factreason": {
"serverUrl": "https://www.factreason.com/mcp"
}
}
}{
"mcpServers": {
"factreason": {
"url": "https://www.factreason.com/mcp"
}
}
}name: FactReason
version: 0.0.1
schema: v1
mcpServers:
- name: FactReason
type: streamable-http
url: https://www.factreason.com/mcp{
"mcpServers": {
"factreason": {
"httpUrl": "https://www.factreason.com/mcp"
}
}
}{
"mcpServers": {
"factreason": {
"type": "http",
"url": "https://www.factreason.com/mcp"
}
}
}{
"mcpServers": {
"factreason": {
"url": "https://www.factreason.com/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fwww.factreason.com%2Fmcp&type=streamable_http&id=factreason&name=FactReason
It answered our last check on 22 October 2026 in 163 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
11, as returned by the server's own tools/list on 14 September 2026: factreason_api_breaking_changes, factreason_api_schema, factreason_auth_playbook, factreason_component_spec, factreason_create_key, factreason_create_topup_link, factreason_deprecation_scan, factreason_discover_api, and 3 more.
It answered our last check on 22 October 2026 in 163 ms. Over 6 checks since 11 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://www.factreason.com/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.github.factreason. Endpoint host: www.factreason.com. ARD identifier: urn:air:io.github.factreason:mcp:factreason.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.