Events - Anchor Browser Docs

Event names follow <entity>.<action>.

Envelope

All events share the same outer envelope:

{
  "id": "evt_<unique>",
  "type": "<event_type>",
  "created": "<ISO 8601 timestamp>",
  "project_id": "<your project id>",
  "text": "<one-line human-readable summary>",
  "data": { "...event-specific fields..." }
}

The text field is a one-line summary of the event built from data. It’s intended for two use cases:

Slack incoming webhooks — Slack expects { "text": "..." } at the top level, so registering a Slack webhook URL as your receiver renders each event as a chat message with no relay needed.
Logs / CLI tools — gives an at-a-glance description without per-type formatting.

The structured data you should integrate against still lives in data; treat text as presentation only. The headers are described in Overview → Receive events and signed per Signature verification.

Tasks

Event	Fired when
`task.completed`	A task execution finishes successfully. Carries artifacts and a recording link if a session was used.
`task.failed`	A task execution fails (any reason). The `data.error.type` field tells you whether it was `automation_failure`, `invalid_credentials`, `timeout`, `agent_error`, or `system_error`.
`task.cancelled`	A task execution was cancelled (e.g. via the API or dashboard).
`task.healed`	Anchor’s self-heal produced a new task version after a failure. The notification points at the new `healed_task_version_id` so your CI/ops can review or auto-promote the fix.

completed
failed
cancelled
healed

completed, failed, and cancelled all include the same rich-output fields:

artifacts[] — task artifacts and per-session downloads, each with a name, url, and (when known) size and content_type. Empty when nothing was captured.
recording_url — short-lived presigned link to the primary session recording. Often missing on task.failed because the recording uploads asynchronously; subscribe to session.recording.ready if you need a stable signal that the recording is ready (then fetch it via the Recordings API).
session_dashboard_url — direct link into the Anchor dashboard for the underlying session.

{
  "type": "task.completed",
  "data": {
    "task_id": "tsk_4f8w9n2b-3d5a-45e7-89ab-cdef0123456f",
    "task_version_id": "tv_demo_v3",
    "execution_id": "exr_8d2c1fda-7b6e-4a3d-9c1f-0e2b3a4c5d6e",
    "session_id": "ses_8d2c1fda",
    "execution_mode": "deterministic",
    "duration_ms": 4218,
    "cost": { "amount": 0.012, "currency": "USD" },
    "output": { "value": { "order_id": "8421", "status": "confirmed" } },
    "artifacts": [
      {
        "name": "order-confirmation.pdf",
        "url": "https://api.anchorbrowser.io/v1/executions/exr_8d2c1fda/artifacts/art_1/fetch",
        "size": 38421,
        "content_type": "application/pdf"
      }
    ],
    "recording_url": "https://anchor-recordings.s3.amazonaws.com/sessions/ses_8d2c1fda/videos/recording.mp4?...",
    "session_dashboard_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

Same shape as task.completed plus an error object. The error.type lets you route programmatically — one of agent_error, timeout, automation_failure, invalid_credentials, system_error.

{
  "type": "task.failed",
  "data": {
    "task_id": "tsk_4f8w9n2b",
    "task_version_id": "tv_demo_v3",
    "execution_id": "exr_8d2c1fda",
    "session_id": "ses_8d2c1fda",
    "duration_ms": 1834,
    "cost": { "amount": 0.005, "currency": "USD" },
    "error": {
      "type": "automation_failure",
      "message": "Submit button selector did not match after 30s",
      "root_cause": "Selector drift after target site redesign"
    },
    "artifacts": [],
    "recording_url": "https://anchor-recordings.s3.amazonaws.com/sessions/ses_8d2c1fda/videos/recording.mp4?...",
    "session_dashboard_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

Same shape as task.completed, with no output and type: "task.cancelled".

{
  "type": "task.cancelled",
  "data": {
    "task_id": "tsk_4f8w9n2b-3d5a-45e7-89ab-cdef0123456f",
    "task_version_id": "tv_demo_v3",
    "execution_id": "exr_8d2c1fda-7b6e-4a3d-9c1f-0e2b3a4c5d6e",
    "session_id": "ses_8d2c1fda",
    "execution_mode": "deterministic",
    "duration_ms": 2103,
    "cost": { "amount": 0.007, "currency": "USD" },
    "artifacts": [],
    "session_dashboard_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

{
  "type": "task.healed",
  "data": {
    "task_id": "tsk_4f8w9n2b",
    "healed_task_version_id": "tv_demo_v4",
    "source_execution_id": "exr_8d2c1fda",
    "error_explanation": "Submit button moved into a new container.",
    "fix_suggestion": "Use accessible label selector instead of XPath.",
    "confidence_score": 0.82,
    "published_as_draft": true
  }
}

Sessions

Event	Fired when
`session.completed`	A browser session finished cleanly. Includes duration and resource-usage breakdown (proxy bytes, network bytes, steps, screenshots, visited domains).
`session.failed`	A browser session was terminated abnormally — pod gone, browser unreachable, or any other non-clean termination.
`session.recording.ready`	The session recording finished uploading. Carries the recording duration, size, and a dashboard URL — fetch the actual recording via the Recordings API to get a fresh presigned link.
`intervention.requested`	The agent paused and is waiting for a human (CAPTCHA, MFA, custom confirm). Includes a `live_view_url` for one-click takeover.
`intervention.resolved`	The intervention was responded to (by your code or a teammate).

session.completed
session.failed
session.recording.ready
intervention.requested
intervention.resolved

{
  "type": "session.completed",
  "data": {
    "session_id": "ses_8d2c1fda",
    "duration_ms": 27540,
    "proxy_bytes": 2581234,
    "network_bytes_total": 4891204,
    "steps": 12,
    "domains": ["example.com", "api.example.com"],
    "session_dashboard_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

reason is a coarse machine-readable category (e.g. browser_unreachable, browser_pod_not_found); use it for routing, not user-facing messages.

{
  "type": "session.failed",
  "data": {
    "session_id": "ses_8d2c1fda",
    "duration_ms": 6789,
    "reason": "browser_unreachable",
    "session_dashboard_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

Minimal payload — the event is a “recording is ready, go fetch it” signal. To download the file, call the Recordings API with the session_id to get a fresh presigned URL.

{
  "type": "session.recording.ready",
  "data": {
    "session_id": "ses_8d2c1fda",
    "duration_ms": 45000,
    "size_bytes": 1823456,
    "session_dashboard_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

{
  "type": "intervention.requested",
  "data": {
    "session_id": "ses_8d2c1fda",
    "request_id": "req_4d2e9c6a",
    "message": "Solve the captcha to continue",
    "input_type": "confirm",
    "live_view_url": "https://app.anchorbrowser.io/sessions/ses_8d2c1fda"
  }
}

Carries just session_id and request_id. The user’s actual response is never included in the payload.

{
  "type": "intervention.resolved",
  "data": {
    "session_id": "ses_8d2c1fda",
    "request_id": "req_4d2e9c6a"
  }
}

Batches

Event	Fired when
`batch.completed`	All sessions in a batch reached a terminal state and at least one succeeded.
`batch.failed`	Every session in the batch failed (or the batch produced zero sessions).

Both events carry the same payload shape — only the type and status field differ.

{
  "type": "batch.completed",
  "data": {
    "batch_id": "bat_92ab7de1",
    "total_requests": 25,
    "completed_requests": 25,
    "failed_requests": 0,
    "status": "completed"
  }
}

{
  "type": "batch.failed",
  "data": {
    "batch_id": "bat_92ab7de1",
    "total_requests": 25,
    "completed_requests": 18,
    "failed_requests": 7,
    "status": "failed"
  }
}

Identity

Event	Fired when
`identity.authenticated`	An identity successfully authenticated and is now usable for subsequent runs. Use this if you need positive confirmation that a credential rotation or first-time login worked.
`identity.authentication_failed`	An identity-based login attempt failed. The `failure_type` field distinguishes `invalid_credentials` (the password was wrong) from `automation_failure`.

authenticated
authentication_failed

{
  "type": "identity.authenticated",
  "data": {
    "identity_id": "idn_acme_orders",
    "application_id": "app_acme",
    "session_id": "ses_8d2c1fda",
    "execution_id": "exr_8d2c1fda"
  }
}

{
  "type": "identity.authentication_failed",
  "data": {
    "identity_id": "idn_acme_orders",
    "application_id": "app_acme",
    "execution_id": "exr_8d2c1fda",
    "failure_type": "invalid_credentials",
    "error_message": "login_succeeded was false"
  }
}

​Envelope

​Tasks

​Sessions

​Batches

​Identity

Envelope

Tasks

Sessions

Batches

Identity