> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stateset.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Give the agent an API-call tool

> The tool

### Path parameters

<ParamField path="id" type="string (uuid)" required>
  The agent id.
</ParamField>

### Headers

<ParamField header="Idempotency-Key" type="string">
  Optional client-generated key that makes the POST safe to retry: a repeat with the same key and body replays the original response instead of creating a duplicate.
</ParamField>

### Request body

`CreateFunction`

<ParamField body="function_name" type="string" required>
  Minimum length: `1`. Maximum length: `200`.
</ParamField>

<ParamField body="endpoint" type="string" required>
  Public http(s) URL. Private and metadata addresses are rejected. Minimum length: `1`. Maximum length: `2000`.
</ParamField>

<ParamField body="method" type="string" required>
  Minimum length: `1`. Maximum length: `20`.
</ParamField>

<ParamField body="description" type="string">
  Maximum length: `5000`.
</ParamField>

<ParamField body="activated" type="boolean" />

<ParamField body="parameters" type="object[]">
  Maximum items: `100`.

  <Expandable title="parameters">
    <ParamField body="name" type="string" required>
      Minimum length: `1`. Maximum length: `100`.
    </ParamField>

    <ParamField body="type" type="string" required>
      Minimum length: `1`. Maximum length: `50`.
    </ParamField>

    <ParamField body="description" type="string">
      Maximum length: `1000`.
    </ParamField>

    <ParamField body="required" type="boolean" />
  </Expandable>
</ParamField>

<ParamField body="headers" type="object">
  Additional keys map to values of type `string`.
</ParamField>

<ParamField body="timeout" type="integer">
  Minimum: `1000`. Maximum: `300000`.
</ParamField>

### Response

`Function`

<ResponseField name="object" type="string">
  Fixed value: `'function'`.
</ResponseField>

<ResponseField name="id" type="string" />

<ResponseField name="name" type="string,null" />

<ResponseField name="endpoint" type="string,null" />

<ResponseField name="method" type="string,null" />

<ResponseField name="description" type="string,null" />

<ResponseField name="activated" type="boolean" />

<ResponseField name="agent_id" type="string,null" />

### Status codes

| Code | Meaning |
| - | - |
| `201` | The tool |
| `400` | Invalid request. `issues` names the offending field(s). |
| `401` | Missing, invalid, or expired API key. |
| `403` | The key lacks a required scope. |
| `404` | Not found, or not in the organization that owns the key. |
| `409` | Conflict — either the creation ceiling was reached for this organization (`agent_limit_reached`), or a request with the same Idempotency-Key is still in flight (`idempotency_in_progress`); retry the latter after the first attempt settles. |
| `422` | The Idempotency-Key was already used with a DIFFERENT request body (`idempotency_key_reused`). Reuse a key only to retry the identical request. |
| `429` | Rate limit exceeded. |

### Access

| | |
| - | - |
| Required scope | `agents:write` |
| Rate limit | 30 requests per minute |

### Using this contract

Read the [source OpenAPI document](/spec/responsecx.json) for declared schemas and alternatives.
This page also includes documented corrections from the [spec overlays](https://github.com/stateset/docs/tree/main/spec/overlays).
Example IDs and values are illustrative; replace them with records from your workspace.

<RequestExample>
  ```bash cURL theme={null}
  curl --silent --show-error --fail-with-body --request POST \
    --url 'https://response.stateset.com/api/v1/agents/{id}/functions' \
    --header "Authorization: Bearer $RESPONSECX_API_KEY" \
    --header "Idempotency-Key: ${IDEMPOTENCY_KEY:?Set a unique key for this operation; preserve it on retries}" \
    --header 'Content-Type: application/json' \
    --data '{
    "function_name": "string",
    "endpoint": "https://example.com/webhooks/stateset",
    "method": "string",
    "description": "Two-person tent, green — replacement for damaged pole set.",
    "activated": true,
    "parameters": [
      {
        "name": "Two-Person Tent",
        "type": "standard",
        "description": "Two-person tent, green — replacement for damaged pole set.",
        "required": true
      }
    ],
    "headers": {},
    "timeout": 1000
  }'
  ```
</RequestExample>

<ResponseExample>
  ```json 201 theme={null}
  {
    "object": "function",
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "name": "Two-Person Tent",
    "endpoint": "https://example.com/webhooks/stateset",
    "method": "string",
    "description": "Two-person tent, green — replacement for damaged pole set.",
    "activated": true,
    "agent_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
  }
  ```
</ResponseExample>


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