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MCP server report

Postlia MCP server

com.postlia/postlia

We checked this server on 2 November 2026 with McpStamp Check engine 1.2.0. It scored 56 of 100 (grade D), higher than 8.1% of the 33,003 registry servers that responded over HTTPS that day. Ready for MCP Registry. Not ready for Claude, ChatGPT and Gemini.

Measured facts

Score
56D
Sign-in
API key or other
Tools listed
15
Protocol version
2025-11-25
Stores

Store readiness

StoreStatusReason
Claude Connectors Directory Not ready Blocked by readOnlyHint or destructiveHint on every tool and Human-readable title on every tool.
ChatGPT app directory Not ready Blocked by Sign-in method the store supports (OAuth or none), Protected resource metadata (RFC 9728), Authorization server metadata (RFC 8414 / OIDC), readOnlyHint or destructiveHint on every tool, Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT) and Human-readable title on every tool.
Gemini Connected Apps Not ready Blocked by Sign-in method the store supports (OAuth or none) and Authorization server metadata (RFC 8414 / OIDC).
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

11 checks to fix

  1. Fails

    readOnlyHint or destructiveHint on every tool

    tool_annotations

    Blocks Claude and ChatGPT.

    Measured 15/15 tools set neither readOnlyHint nor destructiveHint: list_accounts, list_scheduled_posts, create_post, cancel_post, upload_media and 10 more

    Set annotations.readOnlyHint: true on read-only tools and destructiveHint: true on tools that modify or delete data (Claude needs one of them on every tool; ChatGPT needs all three hints, see tool_open_world).

  2. Fails

    Protected resource metadata (RFC 9728)

    auth_prm

    Blocks ChatGPT.

    Measured Not found: https://postlia.com/.well-known/oauth-protected-resource/api/mcp -> 404; https://postlia.com/.well-known/oauth-protected-resource -> 404

    Serve RFC 9728 metadata at /.well-known/oauth-protected-resource (plus the path-suffixed form) with "resource" and "authorization_servers".

  3. Fails

    Authorization server metadata (RFC 8414 / OIDC)

    auth_as_metadata

    Blocks ChatGPT and Gemini.

    Measured Not found: https://postlia.com/.well-known/oauth-authorization-server -> 404; https://postlia.com/.well-known/openid-configuration -> 404

    Serve RFC 8414 metadata at <issuer>/.well-known/oauth-authorization-server with authorization_endpoint, token_endpoint and response_types_supported ["code"].

  4. Fails

    Sign-in method the store supports (OAuth or none)

    auth_method

    Blocks ChatGPT and Gemini.

    Measured unknown method: HTTP 401 and no working OAuth discovery: the server expects a credential such as an API key or static token

    ChatGPT and Gemini cannot send a static API key or token: add MCP OAuth (protected resource metadata and authorization server metadata), or serve the tools without auth. Claude accepts a static credential in a request header only in a beta

  5. Fails

    Explicit readOnlyHint, destructiveHint and openWorldHint (ChatGPT)

    tool_open_world

    Blocks ChatGPT.

    Measured 15/15 tools miss an explicit hint: list_accounts, list_scheduled_posts, create_post, cancel_post, upload_media and 10 more

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

  6. Fails

    Human-readable title on every tool

    tool_titles

    Blocks Claude and ChatGPT.

    Measured 15/15 without title: list_accounts, list_scheduled_posts, create_post, cancel_post, upload_media and 10 more

    Add a short human-readable "title" to every tool (shown in store UIs and consent screens).

  7. Fails

    401 carries WWW-Authenticate resource_metadata

    auth_challenge

    Measured unknown method: HTTP 401 without WWW-Authenticate

    On 401, send WWW-Authenticate: Bearer resource_metadata="<protected resource metadata URL>".

  8. 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.

  9. Warning

    Tool descriptions

    tool_descriptions

    Measured 5 under 60 chars: list_scheduled_posts, cancel_post, list_drafts, create_draft, delete_draft

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

  10. Warning

    initialize latency

    latency

    Measured 1913 ms

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

  11. Warning

    JSON-RPC error for unknown method

    jsonrpc_errors

    Measured HTTP 401 instead of a JSON-RPC error

    Route the method first and answer unknown methods with JSON-RPC error -32601 before the auth check, or return a JSON-RPC error body with the 401.

10 checks passed, 6 did not run

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, tools capability declared, tools/list returns tools, inputSchema is an object schema, Tool names are valid and portable.

Not run. Resource metadata "resource" equals the server URL, 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. These need an OAuth sign-in flow the check could not reach.

Run a fresh check

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McpStamp score for Postlia

Markdown

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

HTML

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

About this server

Schedule and publish social posts to 7 networks from AI agents. Postlia API key (Pro) required.
Registry name
com.postlia/postlia
Remote URL
https://postlia.com/api/mcp
Version
1.0.0
Website
postlia.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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