---
# @generated by sylphx-gen. Do not edit.
title: "Resume an agent session"
description: "`agents.agent_sessions.resume` (POST /v1/{name}:resume): Consumes all ready owners atomically with fresh exact-next-turn authority."
type: reference
product: agents
summary: "Consumes all ready owners atomically with fresh exact-next-turn authority."
updated: 2026-09-28
nav: false
---

Consumes all ready owners atomically with fresh exact-next-turn authority.

- **Path** `POST https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/agent_sessions/agent-session:resume`
- **Scope** `agents:sessions`
- **Effect** `write` — a successful call changes state.
- **Collection** [agent_sessions](/docs/api/agent_sessions)

## Request

| Field | Type | What it is |
| --- | --- | --- |
| `name` | `string` | Existing owning Session, which must be idle or failed. Required. |
| `operation_id` | `string` | Permanent caller mutation identity, at most 128 bytes. Required. |
| `waits` | `string[]` | Exact ready owners, 1 to 16; must include all outstanding Session waits. Required. |
| `execution` | `SessionTurnExecution` | Fresh handles captured for this exact next turn; no Task is required. Required. |
| `queued_execution_generation` | `int64` | Nonzero for automatic continuation: require this exact queued authority generation, caller, Goal terms and execution. Zero is explicit fresh caller admission. A delayed automatic callback never selects a replacement. |

### SessionTurnExecution

| Field | Type | What it is |
| --- | --- | --- |
| `turn` | `int64` | The expected next turn. A concurrent admission never changes this pin. Required. |
| `runtime_credential_handle` | `string` | Same-turn captured caller authority for Workflows and lazy Sandbox APIs. Required. Never returned again. |
| `credentials` | `map<string, CredentialBinding>` | Same-turn execution handles by alias, including inference and any pinned tool or repository capabilities. Each retains its existing permission gate. |

### CredentialBinding

| Field | Type | What it is |
| --- | --- | --- |
| `secret` | `string` | A Kernel Secret of this environment, by name. One of the `source` group. |
| `connection` | `string` | A Kernel Connection (a third-party OAuth installation), by name. One of the `source` group. |
| `end_user_provider` | `string` | The end user's own grant in Sylphx Auth's agent token vault, by provider id; the session's end user must hold it. One of the `source` group. |
| `placement` | `string` | How the value is sent: `bearer` (default), `header:<Name>` or `query:<name>`. |
| `handle` | `string` | An opaque credential handle issued for this session, resolved only at egress. This is never a credential value. Never returned again. One of the `source` group. |

## Response

| Field | Type | What it is |
| --- | --- | --- |
| `name` | `string` | `orgs/{org}/projects/{project}/envs/{env}/agent_sessions/{agent_session}/session_events/{session_event}`. |
| `uid` | `string` | `sevt_<cell><ulid>`; never reused. Output only. |
| `meta` | `ResourceMeta` | Resource metadata. |
| `sequence` | `int64` | The position in the session's log, from 1, with no gaps. Output only. |
| `type` | `SessionEventType` | What the event is. Output only. One of `user_message`, `steer`, `agent_message`, `tool_call`, `tool_result`, `approval_requested`, `approval_decided`, `status`, `compaction`, `thought`, `file_change`, `response`, `error`, `usage`, `sandbox`, `wait_changed`, `wait_continuation`. |
| `turn` | `int64` | The turn it belongs to, from 1; 0 for an event outside a turn. Output only. |
| `step` | `int64` | The step within the turn, from 1, assigned by the runtime; 0 for an event that is not a step. Output only. |
| `create_time` | `timestamp` | When it was appended. Output only. |
| `usage` | `StepUsage` | Observed accounting for this step; absent values are unknown, never zero. Output only. |
| `step_key` | `string` | Stable runtime-assigned effect key, independent of invocation attempts. Output only. |
| `message` | `Message` | For USER_MESSAGE, STEER and AGENT_MESSAGE. One of the `payload` group. |
| `tool_call` | `ToolCall` | For TOOL_CALL. One of the `payload` group. |
| `tool_result` | `ToolResult` | For TOOL_RESULT. One of the `payload` group. |
| `approval` | `Approval` | For APPROVAL_REQUESTED and APPROVAL_DECIDED. One of the `payload` group. |
| `status_change` | `StatusChange` | For STATUS. One of the `payload` group. |
| `thought` | `Message` | For THOUGHT: a reasoning summary, never private model reasoning. One of the `payload` group. |
| `file_change` | `FileChange` | For FILE_CHANGE. One of the `payload` group. |
| `response` | `TurnResult` | For RESPONSE: the completed turn's answer and usage. One of the `payload` group. |
| `error` | `ErrorEvent` | For ERROR. One of the `payload` group. |
| `sandbox` | `SandboxActivity` | For SANDBOX: authoritative allocation/release history, including replacements. One of the `payload` group. |
| `wait` | `AgentSessionWait` | For WAIT_CHANGED: a durable wait fact, without execution authority. One of the `payload` group. |
| `wait_continuation` | `SessionWaitContinuation` | For WAIT_CONTINUATION: ready owners consumed by exact turn admission. One of the `payload` group. |

### ResourceMeta

| Field | Type | What it is |
| --- | --- | --- |
| `generation` | `int64` | Increases by one on every change to `spec`. Output only. |
| `etag` | `string` | Strong ETag (AIP-154): changes on any change to spec, status, or metadata. Send it back as `If-Match` or `etag` to make Update and Delete conditional; a mismatch fails with ABORTED / 409 `ETAG_MISMATCH`. Output only. |
| `create_time` | `timestamp` | When the Resource was created. Output only. |
| `update_time` | `timestamp` | When the Resource last changed. Output only. |
| `delete_time` | `timestamp` | Set while the Resource is being deleted. Output only. |
| `labels` | `map<string, string>` | Caller-writable, indexed labels (AIP-122 label rules). |
| `annotations` | `map<string, string>` | Caller-writable, unindexed annotations. |
| `display_name` | `string` | Caller-writable human-readable name. |
| `creator` | `string` | The principal that created the Resource. Output only. |

### StepUsage

| Field | Type | What it is |
| --- | --- | --- |
| `input_tokens` | `uint64` | Uncached input tokens the step was charged for; absent when unknown. Output only. |
| `cached_tokens` | `uint64` | Input tokens served from the provider cache; absent when unknown. Output only. |
| `output_tokens` | `uint64` | Output tokens; absent when unknown. Output only. |
| `cost_usd` | `string` | The exact decimal USD charge the gateway reported; absent when unknown. Output only. |
| `model` | `string` | The catalog id the step ran on; empty for a step with no inference. Output only. |
| `kind` | `string` | `model`, `tool`, `compaction` or `subcall`. Output only. |
| `first_delta_time` | `timestamp` | For a model step: when the runtime received the stream's first non-empty assistant text or tool-call delta (not a role-only or empty chunk), on the runtime's clock, from the attempt that produced the recorded step. Output only. |

### Message

| Field | Type | What it is |
| --- | --- | --- |
| `parts` | `ContentPart[]` | The content, in order; 1 to 64 parts. Required. |

### ToolCall

| Field | Type | What it is |
| --- | --- | --- |
| `id` | `string` | The call's id within the session, `(turn, step)` based. Output only. |
| `tool` | `string` | The tool name. Output only. |
| `input` | `struct` | The input, as the model sent it. Output only. |
| `model_call_id` | `string` | The model's own id for the call, as sent; never used as a key. Output only. |
| `client` | `bool` | Whether the client must execute this pending call. Calls rejected before dispatch remain in history with this false and a corresponding ToolResult. Output only. |
| `deadline` | `timestamp` | The client call's fixed deadline. A reconnecting client never starts a call after this time; retries retain the original deadline and call id. Output only. |

### ToolResult

| Field | Type | What it is |
| --- | --- | --- |
| `call_id` | `string` | The ToolCall's `id`. Output only. |
| `output` | `value` | The output. Output only. |
| `error` | `bool` | Whether the call failed; `output` then holds the error. Output only. |
| `duration` | `duration` | How long the call took. Output only. |

### Approval

| Field | Type | What it is |
| --- | --- | --- |
| `call_id` | `string` | The ToolCall's `id`. Output only. |
| `decision` | `ApprovalDecision` | The answer, once given; unset while it waits. Output only. One of `approve`, `reject`. |
| `remember` | `bool` | Whether the answer covers later calls of the same tool in this session ("always allow"). Output only. |
| `principal` | `string` | Who answered. Output only. |
| `reason` | `string` | The reason given, if any. Output only. |

### StatusChange

| Field | Type | What it is |
| --- | --- | --- |
| `state` | `SessionState` | The state after the change. Output only. One of `idle`, `running`, `awaiting_approval`, `awaiting_client`, `failed`, `archived`. |
| `reason` | `string` | Why, for FAILED and INTERRUPTED: a registry error code and message. Output only. |

### FileChange

| Field | Type | What it is |
| --- | --- | --- |
| `path` | `string` | The path relative to the session's repository root. Output only. |
| `change` | `string` | `added`, `modified`, `deleted`, `renamed` or `copied`. Output only. |
| `added` | `int64` | Lines added, when reported by the harness. Output only. |
| `removed` | `int64` | Lines removed, when reported by the harness. Output only. |
| `old_path` | `string` | The previous path, for a rename or copy. Output only. |
| `source` | `string` | `edit` for an incremental edit or `final` for the turn's final diff. Output only. |

### TurnResult

| Field | Type | What it is |
| --- | --- | --- |
| `text` | `string` | The final response's text. Output only. |
| `is_error` | `bool` | Whether the turn ended with an error. Output only. |
| `usage` | `TurnTokenUsage` | Model token usage reported by the harness. Output only. |
| `cost_micros` | `int64` | The reported cost, in micro-USD. Output only. |
| `duration` | `duration` | How long the turn ran. Output only. |
| `first_delta_time` | `timestamp` | The first non-empty assistant text or tool-call delta of the turn: the earliest `first_delta_time` of its recorded model steps. Output only. |

### ErrorEvent

| Field | Type | What it is |
| --- | --- | --- |
| `kind` | `string` | The registry error code or harness error kind. Output only. |
| `message` | `string` | A safe error description. Output only. |

### SandboxActivity

| Field | Type | What it is |
| --- | --- | --- |
| `lease` | `string` | The lease's resource name. Output only. |
| `state` | `string` | `allocated` or `released` (the release was read back as ENDED). Output only. |
| `sandbox_seconds` | `string` | On `released`: exact decimal seconds from allocation to release. Output only. |

### AgentSessionWait

| Field | Type | What it is |
| --- | --- | --- |
| `name` | `string` | Exact name; the final segment is the conserved wait UUID. |
| `uid` | `string` | Immutable platform Resource UID. Output only. |
| `meta` | `ResourceMeta` | Standard metadata. Output only. |
| `goal` | `string` | Optional exact Goal in this Session, never a current-Goal selector. |
| `type` | `string` | time or signal. Other producer types require their own admitted adapter. Required. |
| `reference` | `string` | Exact source reference for a signal; empty for a timer. |
| `deadline` | `timestamp` | Actual future due time; required only for a timer. |
| `resume_prompt` | `string` | What to do after observing this wait's evidence, at most 16 KiB. Required. |
| `state` | `string` | active, ready, resolved or cancelled. Ready still requires turn admission. Output only. |
| `evidence` | `struct` | Original bounded observed evidence, retained through delivery and restart. Output only. |
| `resumed_turn` | `int64` | The only turn that consumed this wait; unset until resolved. Output only. |
| `create_time` | `timestamp` | Creation time. Output only. |
| `update_time` | `timestamp` | Last state change time. Output only. |

### SessionWaitContinuation

| Field | Type | What it is |
| --- | --- | --- |
| `waits` | `AgentSessionWait[]` | Conserved wait snapshots and observed evidence for this exact turn. Output only. |

### ContentPart

| Field | Type | What it is |
| --- | --- | --- |
| `text` | `string` | Text. One of the `part` group. |
| `file` | `FileRef` | A file, by Sylphx Data object URL or an https URL. One of the `part` group. |

### TurnTokenUsage

| Field | Type | What it is |
| --- | --- | --- |
| `input_tokens` | `int64` | Input tokens. Output only. |
| `output_tokens` | `int64` | Output tokens. Output only. |
| `cache_read_tokens` | `int64` | Input tokens read from the model's cache. Output only. |
| `cache_write_tokens` | `int64` | Input tokens written to the model's cache. Output only. |

### FileRef

| Field | Type | What it is |
| --- | --- | --- |
| `uri` | `string` | Where the file is. Required. |
| `media_type` | `string` | Its media type, for example `image/png`. |
| `filename` | `string` | Its display name. |

## Errors

- [`UNAUTHENTICATED`](/docs/api/errors/UNAUTHENTICATED) — No valid key or token was presented.
- [`PERMISSION_DENIED`](/docs/api/errors/PERMISSION_DENIED) — The key lacks the method's permission.
- [`RESOURCE_NOT_FOUND`](/docs/api/errors/RESOURCE_NOT_FOUND) — The named Resource does not exist or is not visible.
- [`INVALID_FIELD`](/docs/api/errors/INVALID_FIELD) — A field failed validation.
- [`INVALID_STATE`](/docs/api/errors/INVALID_STATE) — The Resource is in a state that forbids the call.
- [`IDEMPOTENCY_KEY_REUSED`](/docs/api/errors/IDEMPOTENCY_KEY_REUSED) — An Idempotency-Key was reused with another body.
- [`IDEMPOTENCY_IN_PROGRESS`](/docs/api/errors/IDEMPOTENCY_IN_PROGRESS) — The first call with this Idempotency-Key is still running.

Every error arrives in the body [Errors](/docs/platform/errors) describes.

## Examples

**cURL**

```curl
curl -X POST "https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/agent_sessions/agent-session:resume" \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"execution":{"runtime_credential_handle":"…","turn":1},"operation_id":"…","waits":["…"]}'
```

**TypeScript**

```ts
const response = await sylphx.agents.agentSessions.resume({ execution: { runtimeCredentialHandle: '…', turn: 1 }, name: 'orgs/acme/projects/shop/envs/production/agent_sessions/agent-session', operationId: '…', waits: ['…'] })
```

**Rust**

```rust
let mut req = sylphx::agents::ResumeAgentSessionRequest::default();
req.execution = Some(sylphx::agents::SessionTurnExecution {
    runtime_credential_handle: "…".to_string(),
    turn: 1,
    ..Default::default()
});
req.name = "orgs/acme/projects/shop/envs/production/agent_sessions/agent-session".to_string();
req.operation_id = "…".to_string();
req.waits = vec!["…".to_string()];
let response = sx.agents().agent_sessions().resume(req).await?;
```

**CLI**

```bash
sylphx agents agent-sessions resume orgs/acme/projects/shop/envs/production/agent_sessions/agent-session
```

**MCP**

```json
{ "method_id": "agents.agent_sessions.resume", "args": {"execution":{"runtime_credential_handle":"…","turn":1},"name":"orgs/acme/projects/shop/envs/production/agent_sessions/agent-session","operation_id":"…","waits":["…"]} }
```