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MCP server report

Plumbline MCP server

com.lattice-sys.plumbline/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
18
Protocol version
2025-11-25
Stores

Store readiness

StoreStatusReason
Claude Connectors Directory Ready No blocking check failed.
ChatGPT app directory Not ready Blocked by 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

4 checks to fix

  1. Fails

    Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT)

    tool_open_world

    Blocks ChatGPT.

    Measured 16/18 tools miss an explicit hint: ask_prepare, ask_result, compare_departments, cross_check, describe_fact_capabilities and 11 more

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

  2. Fails

    JSON-RPC error for unknown method

    jsonrpc_errors

    Measured HTTP 400 without a JSON-RPC error body

    Answer unknown methods with {"jsonrpc":"2.0","id":<id>,"error":{"code":-32601,"message":"Method not found"}}.

  3. Fails

    Server instructions

    instructions

    Measured No instructions in the initialize result

    Add an "instructions" string to the initialize result: what the server covers, for whom, and its limits.

  4. Fails

    GET answers SSE or 405

    get_stream

    Measured No response: timeout after 8000 ms

    Return HTTP 405 Method Not Allowed on GET (or a text/event-stream), not a page or 404.

22 checks passed, 1 did not run

Passed. Served over HTTPS, initialize over Streamable HTTP, Supported protocol version negotiated, JSON or SSE response Content-Type, initialize latency, serverInfo name and version, tools capability declared, Sign-in method the store supports (OAuth or none), 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, issuer equals the authorization_servers entry; token_endpoint_auth_methods_supported (ChatGPT), 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, Tool descriptions.

Not run. 401 carries WWW-Authenticate resource_metadata. These need an OAuth sign-in flow the check could not reach.

Run a fresh check

This page is the 2 November 2026 snapshot. If you maintain this server and have shipped fixes since then, re-check it. The live check and the badge show the current result, and the next snapshot will pick up the change.

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McpStamp score for Plumbline

Markdown

[![McpStamp score](https://www.mcpstamp.com/badge?url=https%3A%2F%2Fplumbline.lattice-sys.com%2Fmcp%2Fdemo)](https://www.mcpstamp.com/r/com-lattice-sys-plumbline-mcp/)

HTML

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

About this server

Every figure re-checked against SQL-computed facts; unsupported questions refused with the reason.
Registry name
com.lattice-sys.plumbline/mcp
Remote URL
https://plumbline.lattice-sys.com/mcp/demo
Version
0.1.0
Website
plumbline.lattice-sys.com/
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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