> ## Documentation Index > Fetch the complete documentation index at: https://docs.hookie.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get a proof-of-work challenge to register an agent > Public: no cookie, no key. Issues a signed, stateless challenge that expires in ten minutes. Solve it by finding a `nonce` — a decimal string of at most 32 digits, found by counting up from 0 — such that SHA-256(`challenge` + `":"` + `nonce`) starts with `difficulty_bits` zero bits, then POST /v1/agents/register. The cost is small for one agent and large for a script creating accounts in bulk. `difficulty_bits` is the operator's setting (20 by default), plus 2, 4 or 6 bits once today's registrations pass 50, 75 or 90% of the daily cap: solve at the difficulty the challenge states. Refused when the operator has switched registration off. ## OpenAPI ````yaml /openapi.json get /v1/agents/register/challenge openapi: 3.1.0 info: title: Hookie API version: 1.0.0 summary: Capture, route and deliver webhooks. description: >- Hookie exposes three HTTP surfaces. **Ingest + streaming** is the public plane. A path-form endpoint URL authenticates by its own high-entropy slug — there is no key, token or cookie — and an `ik_live_…` ingest key authenticates the `/v1/*` routes. An endpoint URL files each payload into the endpoint's own dataset through the endpoint's own criteria and mappings (none means the whole payload, as one record); `/v1/ingest/{ingest_key}/{dataset}` stores the payload whole into the named dataset. Project mapping rules are evaluated on exactly one shape, `POST /v1/ingest/{ingest_key}` with no dataset segment, and never on an endpoint URL. **The customer portal API** is a separate, token-authed surface for your end customers, scoped to one portal and one customer. **The admin API** drives the console. It accepts either a browser session or an OAuth bearer token from a connected coding agent — the same routes, the same validation, the same audit trail. An agent's authority is its user's workspace role narrowed to the scopes granted in the console. It also accepts an **admin API key** (`hk_…`, Settings → API keys) for CI, infrastructure-as-code and vendor backends: the key acts as the member who created it, capped at the key's role (viewer, developer or admin — never billing or platform administration), optionally limited to one project, with an optional expiry and IP allowlist. Keys are stored as a SHA-256 hash and shown once; if their creator leaves the workspace they stop working. The same key works on the hosted MCP server at `/mcp`. **A refused agent is told how to proceed.** An agent's grant is one rung of a ladder — `hookie:read` < `hookie:write` < `hookie:manage` — and a call above it answers 403 with `code: "agent_scope_insufficient"`, the `required_scope`, the `granted_scopes` and a `manage_url` to the console page where its user widens it. When the user's own role is the limit the code is `insufficient_role` and there is no link, because no grant can exceed the user; billing, platform admin, managing connected agents and destination signing secrets answer `agent_not_permitted` at every scope. A human in the console still reads `Insufficient role`. **A suspended workspace** (an operator action, for abuse or non-payment) answers every surface with 403 and `reason: "workspace_suspended"`: ingest (endpoint URLs and ingest keys), `/v1/data` and `/v1/stream` refuse before anything is stored or counted, and every admin API write — console, OAuth agent or hosted MCP alike — is refused except billing, platform admin, connected-agent management, revoking an API key, revoking an invite, removing a member or leaving, accepting an invite to another workspace, switching workspaces and the POST-bodied searches. The customer portal API is read-only in the same way: destination writes answer 403 `workspace_suspended`. Reads keep working. Nothing is sent while it is suspended: pending deliveries are paused, workflow runs already under way are paused, open `/v1/stream` connections are closed, and cron triggers, database sources and WebSocket listeners stop. Reinstating sends the paused deliveries, resumes the paused workflow runs where they stopped, and resumes the rest; no stored data is lost. **Rate limits.** `/admin/api/*` and `/mcp` allow about 100 requests every 10 seconds per credential — per API key, per connected agent, or per signed-in person. Over that, the answer is 429 with `Retry-After` (seconds). Like every burst limit here, ingest's included, it is a best-effort guard rather than an exact count: it is counted separately at each Cloudflare location and catches up within seconds, so a short burst can get through above it. The monthly event quota is the exact count. **Idempotency.** A `POST` to `/admin/api/*` may carry an `Idempotency-Key` header (1–255 printable characters, e.g. a UUID). The first request runs and its response is stored for 24 hours; a retry with the same key from the same credential, with the same path and body, gets that response back with `Idempotent-Replayed: true` and runs nothing. The same key with a different path, body or credential is refused with 422; a retry while the first request is still running gets 409. 5xx responses are not stored. `POST /admin/api/api-keys` refuses the header, because its response is a secret shown once and is never stored. **Versioning.** Every `/admin/api/*` and `/mcp` response carries `Hookie-Version` (currently `2026-09-29`). Additive changes — a new route, a new response field, a new optional parameter — ship under the current version, so clients must ignore fields they do not know. A breaking change gets a new dated version, announced in the changelog, and the previous version stays available for at least 12 months; a client pins one by sending `Hookie-Version` on its requests. A version this deployment does not serve is refused with 400 and the list of `supported_versions`. **Agent self-registration.** An AI agent can create its own account with no person involved (#331): `GET /v1/agents/register/challenge` returns a signed proof-of-work challenge, and `POST /v1/agents/register` with the solution, the agent's name, an optional operator contact and `accept_terms` set to the current Terms version creates a WorkOS identity for the agent, a workspace on the Free plan with its Default project, and an admin API key (`hk_…`, role admin) returned once, with a one-time claim token a person uses later to take ownership (`POST /admin/api/agent-accounts/claim`). The key works on `/admin/api/*`, on the hosted MCP server at `/mcp` and with the CLI (`HOOKIE_TOKEN`). Until a person claims the workspace, billing, SSO and organization requests, invites, Google Workspace linking and creating more API keys are refused to it (`agent_not_permitted`), and Free-plan quotas apply in full. The registration is rate limited per IP (an IPv6 address by its /64), capped per day across the platform with no one network taking more than a tenth of the cap, asks for more proof of work as the day's cap fills, and can be switched off by the operator. This document is generated from the request handlers and adversarially verified against them. contact: name: Hookie url: https://hookie.ai license: name: Proprietary url: https://hookie.ai/legal/terms servers: - url: https://app.hookie.ai description: Production - url: https://app.preview.hookie.ai description: Preview security: [] tags: - name: Ingest description: Send events to Hookie. - name: Streaming description: Tail events in real time over SSE or WebSocket. - name: Portal description: Token-authed surface for your end customers. - name: Projects description: Projects and their settings. - name: Routing description: Rules, endpoints, datasets and records. - name: Delivery description: Destinations, deliveries and replay. - name: Workflows description: Multi-step workflows, triggers and AI agents. - name: Observability description: Search, correlation, stats and the audit log. - name: Workspace description: >- The workspace itself: its name and slug, its members and their roles, shareable-link invites, ownership transfer, the switcher between the workspaces a person belongs to, admin API keys, data export and closure. - name: Data API description: >- Read-only access to the datasets and columns a project exposes, with per-project keys. - name: Broadcast Logs description: >- Forward a project's logs and traces over OTLP/HTTP (JSON) to Datadog, Grafana Cloud, an OpenTelemetry Collector, PostHog or Sentry. - name: Status description: >- Whether the API can answer at all: the public health check that hookie.ai/status reads. - name: Agents description: >- Agent self-registration (#331): an AI agent creates its own Hookie account, with no person involved, and gets an admin API key for the admin API, the hosted MCP server and the CLI. The account starts on the Free plan; a person can later claim it with the one-time claim token. See docs.hookie.ai → Agents and the design note docs/design/agent-self-registration.md. paths: /v1/agents/register/challenge: get: tags: - Agents summary: Get a proof-of-work challenge to register an agent description: >- Public: no cookie, no key. Issues a signed, stateless challenge that expires in ten minutes. Solve it by finding a `nonce` — a decimal string of at most 32 digits, found by counting up from 0 — such that SHA-256(`challenge` + `":"` + `nonce`) starts with `difficulty_bits` zero bits, then POST /v1/agents/register. The cost is small for one agent and large for a script creating accounts in bulk. `difficulty_bits` is the operator's setting (20 by default), plus 2, 4 or 6 bits once today's registrations pass 50, 75 or 90% of the daily cap: solve at the difficulty the challenge states. Refused when the operator has switched registration off. operationId: getAgentRegistrationChallenge responses: '200': description: A challenge. content: application/json: schema: type: object required: - challenge - algorithm - difficulty_bits - expires_at - solve - register_url - terms_version - terms_url properties: challenge: type: string description: >- `v1..`, signed by Hookie. Send it back unchanged as `pow.challenge`. Single use: one challenge registers at most one account. algorithm: type: string enum: - sha256 difficulty_bits: type: integer description: >- Leading zero bits SHA-256(challenge + ":" + nonce) must have. 20 by default (about a million hashes on average: one to three seconds of CPU with Node's crypto.createHash or Python's hashlib); the operator can set 12–26. expires_at: type: string format: date-time description: Ten minutes after issue. solve: type: string description: The puzzle and the next request, in words. register_url: type: string format: uri terms_version: type: string description: >- The current Terms of Use version (currently `2026-10-01`): the value `accept_terms` must have. terms_url: type: string format: uri '405': description: Only GET. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: >- Too many requests from this address (`reason: rate_limited`, the AGENT_RL limiter: about 5 a minute per IP, an IPv6 address counted by its /64, best-effort and counted per Cloudflare location), or, on POST, today's platform-wide registration cap is reached (`reason: daily_cap_reached`) or this network (an IPv4 address or an IPv6 /48) has made its share of it, a tenth (`reason: source_daily_limit`); both retry after midnight UTC. content: application/json: schema: $ref: '#/components/schemas/Error' headers: Retry-After: description: >- Seconds to wait before retrying. Same value as retry_after in the body. schema: type: integer '503': description: >- `agent_registration_disabled`: the operator has switched agent self-registration off. `agent_registration_unavailable`: this environment has no WorkOS API key, so the agent's identity cannot be made. On POST also `registration_incomplete`: retry the SAME request after `retry_after` seconds; it finishes the registration rather than making another. content: application/json: schema: $ref: '#/components/schemas/Error' security: [] components: schemas: Error: type: object required: - error properties: error: type: string description: Human-readable reason. retry_after: type: integer description: Seconds to wait. Present on 429. upgrade_url: type: string format: uri description: >- Present on a monthly-quota 429, and on a `member_limit_reached` 403 (the console's Settings → Plan & billing). reason: type: string description: >- Machine-readable reason, where the status alone is ambiguous. `workspace_suspended` (403): the workspace is suspended; `delivery_allowance_exhausted` (429): a replay was refused because the monthly delivery allowance is used. `endpoint_disabled` (503): the endpoint is switched off; `handshake_failed`: a provider URL-verification challenge could not be answered (#193). `missing_header`, `bad_signature`, `stale_timestamp` (401): an endpoint's provider signature check failed; `scheme` names the check. `portal_customer_mismatch` (409): a portal token was requested for, or the vendor switched on the endpoint of, a customer other than the one the portal now serves (PORT-2g); `customer_id` and `customer_name` name that customer. Agent self-registration (#331), on /v1/agents/register: `rate_limited` (429), `agent_registration_disabled` and `agent_registration_unavailable` (503), `invalid_body`, `invalid_agent_name`, `invalid_operator_contact`, `terms_not_accepted` (with `terms_version`), `proof_of_work_required`, `invalid_challenge`, `challenge_expired`, `invalid_proof_of_work`, `invalid_idempotency_key` (400), `body_too_large` (413), `already_registered`, `registration_in_progress`, `challenge_spent` (409, with `account_id`), `daily_cap_reached`, `source_daily_limit` (429), `identity_provider_error` (502), `registration_incomplete` (503). code: type: string enum: - agent_scope_insufficient - insufficient_role - agent_not_permitted - member_limit_reached description: >- Present on a 403 to an OAuth-connected agent, and on a member-limit 403 to anyone. `agent_scope_insufficient`: the agent's grant is below what the call needs, and widening it would let the call through (see `required_scope` and `manage_url`). `insufficient_role`: the user's OWN workspace role does not allow the call, so no grant can — a workspace owner or admin has to change the user's role first, in the console under Settings → Members. `agent_not_permitted`: no connected agent or API key may do this at any scope (billing, platform admin, managing connected agents, a destination's signing secret, invites of any kind, changing a role, removing a member, transferring ownership, listing or switching a person's workspaces, and creating API keys). To a self-registered agent account nobody has claimed yet (#331) it also carries `claim_required: true`: a person must claim the workspace with the claim link from registration before anyone can do it. `member_limit_reached` (#308): the workspace already has as many members as its plan allows, so an invite cannot be created or accepted; `max_members`, `members` and `upgrade_url` say how many and where to upgrade. required_scope: type: string enum: - hookie:read - hookie:write - hookie:manage description: 'With `code`: the scope the refused call needs.' granted_scopes: type: array items: type: string description: 'With `code`: the scopes the agent''s grant holds now.' manage_url: type: string format: uri description: >- With `code: "agent_scope_insufficient"` only: the console's Settings → Connected agents page, opened on this agent (`…/#/settings/agents?client=`), where its user widens the grant. The change applies on the agent's next request. scheme: type: string description: 'Present on a signature 401: the endpoint''s verification scheme.' max_members: type: integer description: 'With `code: "member_limit_reached"`: the plan''s member limit.' members: type: integer description: 'With `code: "member_limit_reached"`: the workspace''s members now.' customer_id: type: - string - 'null' description: >- On a `portal_customer_mismatch` 409: the customer the portal already serves. customer_name: type: - string - 'null' description: >- On a `portal_customer_mismatch` 409: that customer's display name, if one was given. account_id: type: string description: >- On a 409 from POST /v1/agents/register: the agent account the earlier request created (or is creating). Never accompanied by a credential. terms_version: type: string description: >- On a `terms_not_accepted` 400: the Terms version `accept_terms` must equal. claim_required: type: boolean description: >- With `code: "agent_not_permitted"`, to a self-registered agent account nobody has claimed (#331): the refused action needs a person, who first claims the workspace with the claim link from the registration response (`claim.url`). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.