--- title: "Lingo.dev MCP server | Agent MCP Directory" description: "Lingo.dev: sign-in required (OAuth DCR), tools not seen, not counted as an MCP server. Directory entry with sources. Category: Developer Tools." canonical: https://agentmcpdirectory.com/directory/lingo-dev site: "Agent MCP Directory" last_updated: 2026-11-05 section: "Directory entries" --- # Lingo.dev MCP server | Agent MCP Directory > Lingo.dev: sign-in required (OAuth DCR), tools not seen, not counted as an MCP server. Directory entry with sources. Category: Developer Tools. Source: https://agentmcpdirectory.com/directory/lingo-dev Site: Agent MCP Directory Last reviewed: 2026-11-05 # Lingo.dev: MCP server, CLI and agent surfaces Sign-in required, tools not seen, not counted. The MCP endpoint listed for Lingo.dev at mcp.lingo.dev answered 401 with OAuth metadata on 4 November 2026. Its tools can be listed only after a person authorizes a client, and this directory never signs in. ## Fact sheet | Company | Lingo.dev | | --- | --- | | Domain | lingo.dev | | Category | Developer Tools (Ora leaderboard category) | | MCP server | Sign-in required (OAuth with client registration) | | Ora score | 50, grade C; Ora scanned the domain on 28 September 2026 and the cached score was read on 5 November 2026 from Ora's leaderboard (Ora's score page for lingo.dev, a vendor-published score) | | Company found through | Ora's public leaderboard | | Last verified | 4 November 2026 | ## MCP server | Endpoint | https://mcp.lingo.dev/main | | --- | --- | | How it was found | listed in Ora's public leaderboard | | Transport | streamable-http | | HTTP status | 401 | | Connected | 4 November 2026, 20:03 UTC | | Handshake time | 221 ms over 1 attempt | The endpoint answered the handshake with a sign-in challenge, so the tool list is not visible to this directory. It is not counted as an MCP server: a sign-in challenge is its own state, and the connector listed no tools. ### Connector log 2 connections on 4 November 2026, read-only methods only - 19:58:12Z https://mcp.lingo.dev/main sent initialize result auth-required (HTTP 401) 1002 ms - 20:03:30Z https://mcp.lingo.dev/main sent initialize result auth-required (HTTP 401) 221 ms ## Authentication | Auth type | OAuth with client registration | | --- | --- | | What the challenge said | Bearer resource_metadata="https://mcp.lingo.dev/.well-known/oauth-protected-resource/main" | | Protected resource metadata | mcp.lingo.dev | | Authorization server metadata | oauth.lingo.dev | | Registration endpoint | https://oauth.lingo.dev/register | ### The sign-in route, step by step 1. Request `https://mcp.lingo.dev/main` without a token. It answers 401 and a `WWW-Authenticate` header. 2. Read the protected resource metadata at `https://mcp.lingo.dev/.well-known/oauth-protected-resource/main` to find the authorization server. 3. Register a client at the registration endpoint `https://oauth.lingo.dev/register` (dynamic client registration), so no human has to create an app first. 4. Send a person through the authorization page, then retry the endpoint with the bearer token. The connector stops after step 2 and never authorizes. See [OAuth for MCP: client ID metadata documents and dynamic registration](https://agentmcpdirectory.com/guides/oauth-for-mcp-cimd-dcr/) for how each route works. ## CLI No CLI is on record for Lingo.dev. The directory checks a package only where a source names one, so this is a floor: a company can ship a command line that no source read for this edition mentions. See [shipping a CLI agents can use](https://agentmcpdirectory.com/guides/ship-a-cli-for-agents/). ## Other agent surfaces | Surface | Result | | --- | --- | | OpenAPI file | Not read: the site's robots.txt disallows the path for this crawler. | | WebMCP in the initial HTML | Not detected on the home page by the shared crawl. | | MCP discovery file | Not found (the crawl got a non-200 answer). | | A2A agent card | Not found (the crawl got a non-200 answer). | | A2A agent card (older path) | Not found (the crawl got a non-200 answer). | | agents.json | Not found (the crawl got a non-200 answer). | | OAuth authorization server metadata | Not found (the crawl got a non-200 answer). | | NLWeb endpoint | Not checked in this edition. | ## Registry listings | Registry | Listed | | --- | --- | | Official MCP Registry | Yes: dev.lingo/main | | GitHub MCP Registry | No | | awesome-remote-mcp-servers | No | | Smithery | Not checked: Smithery's listing pages and search API were unavailable on 4 November 2026. | | Glama | Not checked: Glama's API needs a key and attribution terms. | Edition 4 November 2026 Method [How rows are verified](https://agentmcpdirectory.com/method/) Data [CSV and JSON](https://agentmcpdirectory.com/data/) Markdown [This page as markdown](https://agentmcpdirectory.com/directory/lingo-dev/index.md) ## Sources - [Ora score page for lingo.dev](https://ora.ai/score/lingo.dev?utm_source=agentmcpdirectory.com&utm_medium=referral&utm_campaign=entry), read 5 November 2026 (vendor-published score, scanned 28 September 2026, read from GET /api/leaderboard) - [Where Lingo.dev was found](https://registry.modelcontextprotocol.io/v0/servers?search=dev.lingo%2Fmain), read 4 November 2026 - [Official MCP Registry search](https://registry.modelcontextprotocol.io/v0/servers?search=lingo), read 4 November 2026 - [Lingo.dev website](https://lingo.dev), read 4 November 2026 - [Official MCP Registry API, the registry read for this edition](https://registry.modelcontextprotocol.io/v0/servers), read 4 November 2026 Last reviewed 5 November 2026