Enum McpEvent 

pub enum McpEvent {
    ServerStarted {
        addr: String,
    },
    ToolListRequested {
        client_addr: String,
    },
    ToolListReturned {
        client_addr: String,
        tool_count: usize,
    },
    ToolCallReceived {
        client_addr: String,
        tool_name: String,
        parameters: Value,
    },
    ToolCallCompleted {
        client_addr: String,
        tool_name: String,
        success: bool,
        error: Option<String>,
        duration_ms: u64,
    },
    ToolError {
        source: String,
        tool_name: String,
        error: String,
        duration_ms: u64,
    },
    RequestRejected {
        client_addr: String,
        reason: String,
    },
    ConnectionInitialized {
        endpoint: String,
        tool_count: usize,
    },
    ConnectionClosed {
        endpoint: String,
    },
    ToolsDiscovered {
        endpoint: String,
        tool_count: usize,
        tool_names: Vec<String>,
    },
    CacheHit {
        endpoint: String,
        tool_count: usize,
    },
    CacheExpired {
        endpoint: String,
    },
    RemoteToolCallStarted {
        endpoint: String,
        tool_name: String,
        parameters: Value,
    },
    RemoteToolCallCompleted {
        endpoint: String,
        tool_name: String,
        success: bool,
        error: Option<String>,
        duration_ms: u64,
    },
}

Events emitted by MCP servers and MCP clients. Events emitted by MCP servers and MCP HTTP clients.

Variants

ServerStarted

The HTTP server started listening on the supplied address.

Fields

addr: String

Bound socket address.

ToolListRequested

A tool-list request was received from a client.

Fields

client_addr: String

Client IP address.

ToolListReturned

A tool-list response was returned to the client.

Fields

client_addr: String

Client IP address.

tool_count: usize

Number of tools returned.

ToolCallReceived

A tool execution request was received from a client.

Fields

client_addr: String

Client IP address.

tool_name: String

Requested tool name.

parameters: Value

Raw JSON parameters.

ToolCallCompleted

A server-side tool execution completed.

Fields

client_addr: String

Client IP address.

tool_name: String

Tool name.

success: bool

Whether execution succeeded.

error: Option<String>

Optional error message.

duration_ms: u64

Execution duration in milliseconds.

ToolError

A tool call failed at the transport or protocol layer.

Fields

source: String

Client IP or remote endpoint URL.

tool_name: String

Tool name.

error: String

Error message.

duration_ms: u64

Elapsed time in milliseconds.

RequestRejected

A request was rejected before tool execution.

Fields

client_addr: String

Client IP address.

reason: String

Human-readable rejection reason.

ConnectionInitialized

An MCP client initialized successfully.

Fields

endpoint: String

Remote endpoint URL.

tool_count: usize

Number of discovered tools.

ConnectionClosed

An MCP client connection was closed.

Fields

endpoint: String

Remote endpoint URL.

ToolsDiscovered

The tool cache was refreshed from the remote endpoint.

Fields

endpoint: String

Remote endpoint URL.

tool_count: usize

Number of discovered tools.

tool_names: Vec<String>

Discovered tool names.

CacheHit

Cached tool metadata was used.

Fields

endpoint: String

Remote endpoint URL.

tool_count: usize

Number of cached tools.

CacheExpired

Cached tool metadata expired.

Fields

endpoint: String

Remote endpoint URL.

RemoteToolCallStarted

A remote tool call is being dispatched.

Fields

endpoint: String

Remote endpoint URL.

tool_name: String

Tool name.

parameters: Value

JSON parameters.

RemoteToolCallCompleted

A remote tool call completed.

Fields

endpoint: String

Remote endpoint URL.

tool_name: String

Tool name.

success: bool

Whether the tool result succeeded.

error: Option<String>

Optional error message.

duration_ms: u64

Round-trip duration in milliseconds.

Trait Implementations

impl Clone for McpEvent

fn clone(&self) -> McpEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for McpEvent

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

Formats the value using the given formatter.