Harness: MCP server, CLI and agent surfaces
Sign-in required, tools not seen, not counted. No source names an endpoint for Harness; the connector's guess at mcp.harness.io 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 | Harness (registry title: harness.io) |
|---|---|
| Domain | harness.io |
| Category | Developer Tools (Ora leaderboard category) |
| MCP server | Sign-in required (OAuth with client registration) |
| Tranco rank | 8,533 on the list of 4 November 2026 |
| Ora score | 75, grade B; Ora scanned the domain on 1 November 2026 and the cached score was read on 5 November 2026 from its score API (Ora's score page for harness.io, a vendor-published score) |
| Company found through | Ora's public leaderboard |
| Last verified | 4 November 2026 |
MCP server
| Endpoint | https://mcp.harness.io/mcp |
|---|---|
| How it was found | endpoint found by subdomain guess; it answered with a sign-in challenge and was not verified |
| Transport | streamable-http |
| HTTP status | 401 |
| Connected | 4 November 2026, 20:01 UTC |
| Handshake time | 1,270 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
- 19:56:15Z https://mcp.harness.io/mcp sent initialize result auth-required (HTTP 401) 1226 ms
- 20:01:54Z https://mcp.harness.io/mcp sent initialize result auth-required (HTTP 401) 1270 ms
Authentication
| Auth type | OAuth with client registration |
|---|---|
| Protected resource metadata | mcp.harness.io |
| Authorization server metadata | id.harness.io |
| Registration endpoint | https://id.harness.io/oauth/register |
The sign-in route, step by step
- Request
https://mcp.harness.io/mcpwithout a token. It answers 401 and aWWW-Authenticateheader. - Read the protected resource metadata at
https://mcp.harness.io/.well-known/oauth-protected-resource/mcpto find the authorization server. - Register a client at the registration endpoint
https://id.harness.io/oauth/register(dynamic client registration), so no human has to create an app first. - 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 for how each route works.
CLI
No CLI is on record for Harness. 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.
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 | No |
| 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. |