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MCP server report

Signal8 MCP server

ai.signal8/mcp

We checked this server on 2 November 2026 with McpStamp Check engine 1.2.0. It scored 90 of 100 (grade A), higher than 61.4% of the 33,003 registry servers that responded over HTTPS that day. Ready for Claude, Gemini and MCP Registry. Not ready for ChatGPT.

Measured facts

Score
90A
Sign-in
OAuth
Tools listed
109
Protocol version
2025-11-25
Stores

Store readiness

StoreStatusReason
Claude Connectors Directory Ready No blocking check failed.
ChatGPT app directory Not ready Blocked by issuer equals the authorization_servers entry; token_endpoint_auth_methods_supported (ChatGPT) and Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT).
Gemini Connected Apps Ready No blocking check failed.
Official MCP Registry Ready No blocking check failed.

MCP Registry ready means a valid public remote for the registry, not that the server is listed in a store.

Fixes

5 checks to fix

  1. Fails

    Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT)

    tool_open_world

    Blocks ChatGPT.

    Measured 109/109 tools miss an explicit hint: search_companies, get_company_profile, get_quote, get_market_metrics, get_short_interest and 104 more

    Set readOnlyHint, destructiveHint and openWorldHint to explicit true/false on every tool (OpenAI app review requires all three).

  2. Fails

    issuer equals the authorization_servers entry; token_endpoint_auth_methods_supported (ChatGPT)

    auth_chatgpt_metadata

    Blocks ChatGPT.

    Measured issuer "https://api.signal8.ai/" is not exactly the authorization_servers entry "https://api.signal8.ai"

    Use the exact metadata "issuer" string in the protected resource metadata authorization_servers list (no trailing-slash or case differences), and list token_endpoint_auth_methods_supported (for example ["none"] for public clients) in the au

  3. Warning

    Tool descriptions

    tool_descriptions

    Measured 16 over 2000 chars: get_float, search_sec_filings, get_filing_structured, search_filing_text, get_ownership and 11 more

    Keep each tool description between 60 and 2000 characters: when to use it, what it returns, key limits.

  4. Warning

    initialize latency

    latency

    Measured 1521 ms

    Bring initialize under 1.5 s: avoid cold starts and upstream calls in the handshake.

  5. Warning

    JSON-RPC error for unknown method

    jsonrpc_errors

    Measured JSON-RPC error -32001 instead of -32601

    Return JSON-RPC error code -32601 (Method not found) for unknown methods.

22 checks passed

Passed. Served over HTTPS, initialize over Streamable HTTP, Supported protocol version negotiated, JSON or SSE response Content-Type, GET answers SSE or 405, serverInfo name and version, Server instructions, tools capability declared, Sign-in method the store supports (OAuth or none), 401 carries WWW-Authenticate resource_metadata, Protected resource metadata (RFC 9728), Resource metadata "resource" equals the server URL, Authorization server metadata (RFC 8414 / OIDC), First metadata URL Gemini tries answers 200 with the required fields, PKCE S256 advertised, Client registration (DCR or Client ID Metadata Documents), refresh_token grant advertised, tools/list returns tools, inputSchema is an object schema, Tool names are valid and portable, readOnlyHint or destructiveHint on every tool, Human-readable title on every tool.

Run a fresh check

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McpStamp score for Signal8

Markdown

[![McpStamp score](https://www.mcpstamp.com/badge?url=https%3A%2F%2Fmcp.signal8.ai%2Fmcp)](https://www.mcpstamp.com/r/ai-signal8-mcp/)

HTML

<a href="https://www.mcpstamp.com/r/ai-signal8-mcp/"><img src="https://www.mcpstamp.com/badge?url=https%3A%2F%2Fmcp.signal8.ai%2Fmcp" alt="McpStamp score" height="20"></a>
Registry entry

About this server

SEC filings, dilution, insider & institutional ownership, and political-trade data for AI agents.
Registry name
ai.signal8/mcp
Remote URL
https://mcp.signal8.ai/mcp
Version
0.19.0
Source
github.com/signal8ai/signal8-mcp
Website
signal8.ai/mcp
Checked
2 November 2026, engine 1.2.0, no credentials

The description above is the server's own text from the official MCP Registry. If a result looks wrong, run a fresh check and email support@zovo.one with the report link.

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