Append agent thread message

POST

/v1/actions/hospitality.action.append_agent_thread_message/apply

curl --request POST \
  --url https://api.aerandil.com/v1/actions/hospitality.action.append_agent_thread_message/apply \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{ "branch": "2489E9AD-2EE2-8E00-8EC9-32D5F69181C0", "params": { "content": "example", "parent_message_id": "example", "role": "user", "session_id": "example" }, "return_modified": false, "target": { "id": "2489E9AD-2EE2-8E00-8EC9-32D5F69181C0", "object_type": "hospitality.agent_thread" } }'

• Production API

Append one turn to an open agent_thread — the operator’s task (role = user) or the agent’s final reply (role = agent, correlated to its session trace via session_id). Appends into a closed thread are rejected; parent_message_id makes the thread branchable (the Snowflake parent-pointer pattern) and must name a message in the same thread. Refreshes the thread’s last_message_at / message_count projections.

Effects: create hospitality.agent_thread_message; modify hospitality.agent_thread; link hospitality.link.agent_thread_message_in_thread.

Authorizations

• aerandil_oauth
  actions:apply
• aerandil_oauth
  actions:hospitality.action.append_agent_thread_message:apply

Request Body^required

Media typeapplication/json

object

branch

Apply against an open branch’s overlay view instead of the canonical (main) plane. The action’s writes land in the branch’s copy-on-first-write overlay, its events in the branch’s own stream, and the invocation is journaled for merge-by-replay. Branch writes are action-only, so this is the write-side entry point to a branch (POST /v1/branches forks one).

string format: uuid

params

required

object

content

required

The turn's text

string

parent_message_id

Branch parent message id (same thread)

string

role

required

Who authored this turn

string

Allowed values: user agent

session_id

The runtime session (trace) behind an `agent` turn

string

return_modified

When true, the response carries modified_objects and modified_links projections — the engine reads the event log inside the same transaction so the projection observes the handler’s own writes.

boolean

target

required

object

id

required

string format: uuid

object_type

required

Allowed value: hospitality.agent_thread

Responses

200

Action applied. modified_objects and modified_links populated when return_modified: true was supplied.

Media typeapplication/json

ApplyActionResponse

Envelope returned by the Aerandil action engine. correlation_id ties every event emitted by this invocation; modified_objects and modified_links project the events the handler emitted (per the action’s declared effects); warnings carries any non-blocking soft-validator observations.

object

correlation_id

required

Per-invocation correlation id; matches events.correlation_id for every event this action appended.

string format: uuid

modified_links

required

Links established or removed by this invocation. Empty when the caller did not request return_modified.

Array<object>

object

from_id

required

string format: uuid

from_type

required

string

kind

required

Allowed values: linked

link_type

required

Allowed values: hospitality.link.agent_thread_message_in_thread

to_id

required

string format: uuid

to_type

required

string

modified_objects

required

Objects created, modified, or soft-deleted by this invocation. Empty when the caller did not request return_modified.

Array<object>

object

id

required

string format: uuid

kind

required

Allowed values: created modified

object_type

required

Allowed values: hospitality.agent_thread_message hospitality.agent_thread

warnings

Non-blocking soft-validator observations emitted during this invocation (e.g. comp-authority over-limit, recipe pour-cost over sell-price). Absent when no warnings were emitted.

Array<object>

object

message

required

Human-readable summary, suitable for logging or operator-UI surfacing.

string

object_type

required

Object type the warning was raised against.

string

property

Property the warning anchors to, when a single field is the locus. Absent for multi-field rules.

string

rule

required

Stable kebab-case rule identifier (e.g. comp-authority-over-limit).

string

Example

{
  "modified_links": [
    {
      "kind": "linked",
      "link_type": "hospitality.link.agent_thread_message_in_thread"
    }
  ],
  "modified_objects": [
    {
      "kind": "created",
      "object_type": "hospitality.agent_thread_message"
    }
  ]
}

409

Conflict — concurrent modification or unique constraint violation.

422

Validation error — parameter validation or business-rule violation.