Enum UserErrorCategory 

#[non_exhaustive]
pub enum UserErrorCategory {
    WorkflowDependency,
    MissingContext,
    NotFound,
    Duplicate,
    Validation,
    Technical,
}

User-facing error categories for conversation flow control.

When a tool execution fails, this category helps the LLM understand how to respond to the user and what actions might help.

Example

use multi_llm::{ToolResult, error::UserErrorCategory};

// User needs to complete a prerequisite first
let result = ToolResult {
    tool_call_id: "call_123".to_string(),
    content: "Please log in first".to_string(),
    is_error: true,
    error_category: Some(UserErrorCategory::WorkflowDependency),
};

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

WorkflowDependency

User needs to complete a prerequisite action.

Example: “You need to log in before accessing your profile.”

MissingContext

Request is missing required context/parameters.

Example: “Please specify which city you want weather for.”

NotFound

Requested item/resource not found.

Example: “I couldn’t find a user with that email address.”

Duplicate

Attempting to create something that already exists.

Example: “An account with that email already exists.”

Validation

Input validation failed.

Example: “That doesn’t look like a valid email address.”

Technical

Technical/system error - don’t expose details to user.

Example: “Something went wrong. Please try again later.”

Trait Implementations

impl Clone for UserErrorCategory

fn clone(&self) -> UserErrorCategory

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UserErrorCategory

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for UserErrorCategory

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for UserErrorCategory

fn eq(&self, other: &UserErrorCategory) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for UserErrorCategory

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for UserErrorCategory

impl Eq for UserErrorCategory

impl StructuralPartialEq for UserErrorCategory