Free MCP, API auth, webhook and schema diagnostics with bounded checks and safe quote routing.
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First seen 6 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
1
Directories
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4
Tools
From an anonymous probe
-
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Tools
| Tool | Description | Behaviour |
|---|---|---|
| diagnose_api_auth_401 | Diagnose a sanitized HTTP 401 authentication failure without accepting credentials or contacting the target endpoint. | Changes data |
| diagnose_json_schema_failure | Diagnose a bounded JSON Schema or MCP input-schema type mismatch using only sanitized paths and types; no raw payload is required. | Changes data |
| diagnose_mcp_failure | Diagnose sanitized MCP initialize, discovery, transport, capability and tool-schema failures. Returns bounded free checks and never performs a repair or payment. | Changes data |
| diagnose_webhook_signature | Diagnose a sanitized webhook signature/delivery failure without accepting the raw payload, signature value or signing secret. | Changes data |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | NAIF Gravity Diagnostic — Free MCP/API/Webhook Triage | - | 6 Oct 2026 |