systemprompt-identifiers 0.2.2

Typed newtype identifiers (UserId, TraceId, AgentId, McpServerId…) for systemprompt.io AI governance infrastructure. Enforces type-safe IDs across every boundary in the MCP governance pipeline.
Documentation 
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//! Validation error types for identifiers.

use std::fmt;

#[derive(Debug, Clone)]
pub enum IdValidationError {
    Empty {
        id_type: &'static str,
    },
    Invalid {
        id_type: &'static str,
        message: String,
    },
}

impl fmt::Display for IdValidationError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Empty { id_type } => write!(f, "{} cannot be empty", id_type),
            Self::Invalid { id_type, message } => write!(f, "{}: {}", id_type, message),
        }
    }
}

impl std::error::Error for IdValidationError {}

impl IdValidationError {
    #[must_use]
    pub const fn empty(id_type: &'static str) -> Self {
        Self::Empty { id_type }
    }

    #[must_use]
    pub fn invalid(id_type: &'static str, message: impl Into<String>) -> Self {
        Self::Invalid {
            id_type,
            message: message.into(),
        }
    }
}