/mcp is the recommended product MCP endpoint and tracks the latest available implementation, currently v1. /mcp/v1 is supported for clients that explicitly pin v1. Neither endpoint is deprecated. If another major version is introduced, /mcp will follow it and the versioned endpoint will remain pinned. /v1 is the separate agent index. MCP protocol versions are negotiated during initialization, independently of these URL paths.

• Adding an endpoint, a response field, an optional parameter or a new MCP tool is not breaking, and happens without notice.
• Breaking changes to a pinned contract require a new version path. The unversioned /mcp endpoint follows the latest implementation; choose a versioned path when you need to stay on a particular major version.
• The OpenAPI document at /openapi.json always describes what is live right now.

A path being retired announces its deprecation with a Deprecation header and a Link header with rel="successor-version" naming what replaces it. Once a removal date is set, the same responses carry Sunset (RFC 8594) as an HTTP-date.

The commitment: at least 180 days between the first Sunset header and the path being removed, and a deprecated path keeps working unchanged for that whole window. Watch for the header rather than polling this page.

Deprecated today: the q parameter on /ask, an alias for query. It still works and has no removal date; it is marked deprecated in /openapi.json.

curl -sD - -o /dev/null https://youspot.com/mcp
# No Deprecation or Sunset header is sent for this supported endpoint.

Every limited endpoint answers with the RFC 9331 headers, so you can pace against the real budget instead of backing off blindly. The dashed triple is sent alongside for clients that parse it.

The sandbox MCP server allows 60 calls a minute per address. A 429 is a JSON-RPC error with code -32003 and a Retry-After header.

A dropped connection leaves an agent unable to tell a lost response from a refused request. Send Idempotency-Key on a write and the retry is safe: the first answer is replayed rather than the write repeating.

• The key is any unique string up to 255 characters. A UUID is the usual choice.
• A key is scoped to the credential that sent it, so it replays only your own answer. It does not need to be unguessable.
• While /mcp serves v1, it shares retry records with /mcp/v1 for the same credential, key and request body.
• A recorded answer is replayed for 24 hours, with Idempotency-Replayed: true.
• The same key with a different request body is a 422, because that is a client bug rather than a retry.
• Honoured on POST /oauth/register, POST /mcp, POST /mcp/v1 and POST /mcp/sandbox, and declared on those operations in /openapi.json.

curl -X POST https://youspot.com/oauth/register \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"redirect_uris":["https://example.com/callback"],"client_name":"My agent"}'

A tool that cannot finish inside one call enqueues instead and answers with task_id. Poll GET /api/jobs/<task_id> until terminal is true; while it is still going the response carries Retry-After with the interval to use. result is filled once state is succeeded.

curl https://youspot.com/api/jobs/8412 \
  -H "Authorization: Bearer $YOUSPOT_TOKEN"
# {"job_id":8412,"kind":"file_import","state":"running","terminal":false,...}

You can also start one over plain HTTP. POST /api/jobs with a kind answers 202 Accepted and a Location header naming the job, which is the same URL as poll in the body. Starting a kind that is already running reports the running job rather than queuing a second one, so a retry is safe on its own.

curl -i -X POST https://youspot.com/api/jobs \
  -H "Authorization: Bearer $YOUSPOT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"kind":"embed_objects"}'
# HTTP/1.1 202 Accepted
# Location: https://youspot.com/api/jobs/8413
# Retry-After: 5