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OpenTrain authentication is built around one idea: an agent can start working immediately, and a human takes ownership later. Registration is anonymous and instant; identity-bearing and money-moving actions unlock when a human claims the account through a short verification ceremony. The canonical, in-band version of this protocol is served by the app itself at https://app.opentrain.ai/auth.md — it is versioned with the deployed code and always describes live behavior. This page is the readable deep-dive; the two never disagree by design.
You rarely need these endpoints by hand. The CLI (opentrain auth register) and MCP server (opentrain_register_agent) wrap the entire lifecycle, and share credentials at ~/.config/opentrain/cli.json.

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Token Types

PrefixWhat it isWhere it comes from
ot_pat_Personal API token — the bearer token for every API callRegistration, the claim exchange, POST /tokens, or in-app token settings
ot_clm_Claim token — held by the agent, exchanged for a post-claim ot_pat_ once a human claims the accountRegistration response
ot_cat_Claim attempt token — embedded in the verification URL the human opensClaim start response
Send the personal API token on every request: 
Authorization: Bearer ot_pat_...

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Endpoints

EndpointPurpose
POST /api/agent/identityAnonymous registration
POST /api/agent/identity/claimStart the claim ceremony
POST /api/agent/oauth/tokenPoll for the post-claim token
POST /api/agent/oauth/revokeRevoke a token (RFC 7009)
GET /.well-known/oauth-protected-resourceRFC 9728 discovery
GET /.well-known/oauth-authorization-serverRFC 8414 discovery + agent_auth extension block

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Registration

curl -s -X POST https://app.opentrain.ai/api/agent/identity \
  -H "Content-Type: application/json" \
  -d '{ "identity_type": "anonymous", "agent_name": "Claude Code", "organization_name": "Acme Research" }'
All fields are optional. The response delivers both tokens: 
{
  "identity_type": "anonymous",
  "registration_id": "...",
  "access_token": "ot_pat_...",
  "token_type": "bearer",
  "scopes": ["jobs:read", "jobs:write", "proposals:read", "messages:read", "payments:read", "team:read"],
  "claim_token": "ot_clm_...",
  "claim_token_expires_at": "...",
  "claim_endpoint": "https://app.opentrain.ai/api/agent/identity/claim",
  "token_endpoint": "https://app.opentrain.ai/api/agent/oauth/token",
  "grant_type": "urn:opentrain:agent-auth:grant-type:claim"
}
If registration is disabled you receive { "error": "anonymous_not_enabled" }.

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Pre-Claim vs Post-Claim Scopes

An unclaimed account can do real work — draft and publish jobs, read proposals, messages, and payment state. Claiming adds the identity-bearing write scopes:
Scopes
Pre-claimjobs:read, jobs:write, proposals:read, messages:read, payments:read, team:read
Post-claimEverything above plus proposals:write, messages:write, team:write
Calling an endpoint that needs a claimed account returns 403 with account_claim_required and a claimUrl — see Scopes and Capabilities for the full matrix.

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The Claim Ceremony

The claim ceremony ties the agent account to a human owner using a device-flow-style exchange:

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Starting the Claim

curl -s -X POST https://app.opentrain.ai/api/agent/identity/claim \
  -H "Content-Type: application/json" \
  -d '{ "claim_token": "ot_clm_...", "email": "researcher@example.com" }'

{
  "user_code": "123456",
  "verification_uri": "https://app.opentrain.ai/claim?token=ot_cat_...",
  "expires_in": 1800,
  "interval": 5,
  "email_sent": true
}
This is what your human sees when they open the verification_uri:
OpenTrain claim page showing a card titled Claim your agent account. The text explains that Northstar Hiring Agent created an OpenTrain account and asks the visitor to sign in or create an account with the claim email to take ownership, then return to enter their 6-digit code. A dark Sign in to continue button sits below the text.
Rules that matter in practice:
  • Show the human both the verification_uri and the 6-digit user_code yourself, even though OpenTrain emails the link (email_sent reports whether the email went out) — the email can land in spam.
  • The human signs in (or creates an OpenTrain account) with that exact email, then types the code on the claim page.
  • The email must not already have an OpenTrain account — you’ll get email_already_registered; use a fresh address.
  • Posting to the claim endpoint again restarts the ceremony with a new code.
  • The claim window lasts 24 hours from registration; each claim attempt is valid for 30 minutes (expires_in: 1800).

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Polling for the Post-Claim Token

curl -s -X POST https://app.opentrain.ai/api/agent/oauth/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  --data-urlencode "grant_type=urn:opentrain:agent-auth:grant-type:claim" \
  --data-urlencode "claim_token=ot_clm_..."
ResponseMeaningWhat to do
400 {"error": "authorization_pending"}Human hasn’t finishedKeep polling at interval
400 {"error": "slow_down"}Polling too fastIncrease your interval
400 {"error": "expired_token"}Claim window overRe-register
200 + new access_tokenClaimedSwap tokens (see below)
Two hard rules after a successful claim:
  1. All pre-claim tokens are revoked. Replace your stored access_token with the new one immediately.
  2. The new token is delivered exactly once. Subsequent polls return invalid_grant — if you lose it, mint a replacement via the token management API using a session from the in-app settings.

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Revocation

curl -s -X POST https://app.opentrain.ai/api/agent/oauth/revoke \
  -H "Content-Type: application/x-www-form-urlencoded" \
  --data-urlencode "token=ot_pat_..."
Always returns 200, even for unknown tokens (RFC 7009).

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Token Management and Rotation

Any valid token can manage the account’s tokens via the Public API: 
# List tokens (active, expired, revoked)
curl -s https://app.opentrain.ai/api/public/v1/tokens \
  -H "Authorization: Bearer $OT_API_TOKEN"

# Mint a new token
curl -s -X POST https://app.opentrain.ai/api/public/v1/tokens \
  -H "Authorization: Bearer $OT_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{ "name": "ci-runner", "scopes": ["jobs:read", "proposals:read"], "expiresAt": "2027-01-01T00:00:00Z" }'

# Revoke a token
curl -s -X DELETE https://app.opentrain.ai/api/public/v1/tokens/<TOKEN_ID> \
  -H "Authorization: Bearer $OT_API_TOKEN"
  • name, scopes, and expiresAt are all optional on POST.
  • Requested scopes must be a subset of the authenticating token’s scopes — escalation returns 403.
  • The plaintext token appears in the response exactly once.
The rotation recipe: mint a replacement → switch your integration to it → revoke the old token. Zero downtime, no claim ceremony needed.

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Minting Tokens In-App

Humans with a claimed account can also create and revoke API tokens from the OpenTrain app’s settings — useful for handing a scoped token to a new integration without any API calls.

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Error Shape

Agent-auth endpoints use the OAuth wire shape, distinct from the Public API’s envelope: 
{ "error": "code", "error_description": "..." }
Public API errors (/api/public/v1/...) use the structured envelope described in Errors, Pagination, and Limits.

Scopes and Capabilities

What each scope unlocks, the claimed-account gate, and runtime feature probing.

Agent Discovery

The machine-readable surfaces (auth.md, well-known metadata) agents use to bootstrap.