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On this page

Request
Response
SessionEvent
ResourceMeta
Message
ToolCall
ToolResult
Approval
StatusChange
FileChange
TurnResult
ErrorEvent
ContentPart
TurnTokenUsage
Errors
Examples

Reference

List session events

Lists a session's events in sequence order.

Checked 2026-09-28

Lists a session's events in sequence order. To follow a session, call again with the filter sequence > N, N the last sequence read; wait holds the call open until a newer event is appended or the wait ends.

Not available yet. Sylphx Agents is declared in the registry but no backend serves it: every call answers 501 with the problem code UNIMPLEMENTED.

Path GET https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/agent_sessions/agent-session/session_events
Scope agents:sessions
Effect read — nothing is written.
Collection session_events
Query page_size, page_token, filter, wait
Pagination the answer carries session_events and, when there is more, next_page_token

#Request

Field	Type	What it is
`parent`	`string`	The session to list in. Required.
`page_size`	`int32`	At most this many; default 50, clamped to 1000.
`page_token`	`string`	`next_page_token` of the previous page.
`filter`	`string`	AIP-160 filter, limited to `type` and `sequence`; for example `sequence > 42`.
`wait`	`duration`	When no event matches the filter, wait up to this long for one, at most 60s; unset answers at once.

#Response

Field	Type	What it is
`session_events`	`SessionEvent[]`	The page.
`next_page_token`	`string`	The token of the next page; empty on the last page.

#SessionEvent

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`.
`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.
`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.

#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.

#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 runs it (a ClientTool). 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`.
`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.

#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.

#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.

#Errors

RESOURCE_NOT_FOUND — The named Resource does not exist or is not visible.
UNAUTHENTICATED — No valid key or token was presented.
PERMISSION_DENIED — The key lacks the method's permission.
INVALID_FIELD — A field failed validation.
PAGE_TOKEN_MISMATCH — A page token was reused with different parameters.

Every error arrives in the body Errors describes.

#Examples

curl "https://api.sylphx.com/v1/orgs/acme/projects/shop/envs/production/agent_sessions/agent-session/session_events" \
  -H "Authorization: Bearer $SYLPHX_API_KEY"

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