---
title: elicitation
sidebarTitle: elicitation
---

# `fastmcp.server.elicitation`

## Functions

### `parse_elicit_response_type` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L132" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
parse_elicit_response_type(response_type: Any, response_title: str | None = None, response_description: str | None = None) -> ElicitConfig
```


Parse response_type into schema and handling configuration.

Supports multiple syntaxes:
- None: Empty object schema, expect empty response
- dict: `{"low": {"title": "..."}}` -> single-select titled enum
- list patterns:
    - `[["a", "b"]]` -> multi-select untitled
    - `[{"low": {...}}]` -> multi-select titled
    - `["a", "b"]` -> single-select untitled
- `list[X]` type annotation: multi-select with type
- Scalar types (bool, int, float, str, Literal, Enum): single value
- Other types (dataclass, BaseModel): use directly

The ``response_title`` and ``response_description`` arguments customize the
label and description of the wrapped ``value`` property for the scalar/dict/list
shorthand forms. They are only valid when FastMCP is wrapping the response
type; passing them with a full BaseModel/dataclass (or ``None``) raises
``TypeError``, because in those cases the user already controls field
metadata via ``Field(title=..., description=...)``.


### `handle_elicit_accept` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L309" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
handle_elicit_accept(config: ElicitConfig, content: Any) -> AcceptedElicitation[Any]
```


Handle an accepted elicitation response.

**Args:**
- `config`: The elicitation configuration from parse_elicit_response_type
- `content`: The response content from the client

**Returns:**
- AcceptedElicitation with the extracted/validated data


### `get_elicitation_schema` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L368" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
get_elicitation_schema(response_type: type[T]) -> dict[str, Any]
```


Get the schema for an elicitation response.

**Args:**
- `response_type`: The type of the response


### `validate_elicitation_json_schema` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L387" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
validate_elicitation_json_schema(schema: dict[str, Any]) -> None
```


Validate that a JSON schema follows MCP elicitation requirements.

This ensures the schema is compatible with MCP elicitation requirements:
- Must be an object schema
- Must only contain primitive field types (string, number, integer, boolean)
- Must be flat (no nested objects or arrays of objects)
- Allows const fields (for Literal types) and enum fields (for Enum types)
- Only primitive types and their nullable variants are allowed

**Args:**
- `schema`: The JSON schema to validate

**Raises:**
- `TypeError`: If the schema doesn't meet MCP elicitation requirements


## Classes

### `ElicitationJsonSchema` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L36" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Custom JSON schema generator for MCP elicitation that always inlines enums.

MCP elicitation requires inline enum schemas without $ref/$defs references.
This generator ensures enums are always generated inline for compatibility.
Optionally adds enumNames for better UI display when available.


**Methods:**

#### `generate_inner` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L44" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
generate_inner(self, schema: core_schema.CoreSchema) -> JsonSchemaValue
```

Override to prevent ref generation for enums and handle list schemas.


#### `list_schema` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L57" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
list_schema(self, schema: core_schema.ListSchema) -> JsonSchemaValue
```

Generate schema for list types, detecting enum items for multi-select.


#### `enum_schema` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L94" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
enum_schema(self, schema: core_schema.EnumSchema) -> JsonSchemaValue
```

Generate inline enum schema.

Always generates enum pattern: `{"enum": [value, ...]}`
Titled enums are handled separately via dict-based syntax in ctx.elicit().


### `AcceptedElicitation` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L105" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Result when user accepts the elicitation.


### `ScalarElicitationType` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L113" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

### `ElicitConfig` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/server/elicitation.py#L118" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


Configuration for an elicitation request.

**Attributes:**
- `schema`: The JSON schema to send to the client
- `response_type`: The type to validate responses with (None for raw schemas)
- `is_raw`: True if schema was built directly (extract "value" from response)

