smg_mcp/
error.rs

1//! MCP error types.
2//!
3//! Defines error variants for MCP operations including connection, tool execution,
4//! configuration errors, and approval errors.
5
6use thiserror::Error;
7
8pub type McpResult<T> = Result<T, McpError>;
9
10#[derive(Debug, Error)]
11pub enum McpError {
12    #[error("Server not found: {0}")]
13    ServerNotFound(String),
14
15    #[error("Server disconnected: {0}")]
16    ServerDisconnected(String),
17
18    #[error("Tool not found: {0}")]
19    ToolNotFound(String),
20
21    #[error("Tool name collision: '{tool_name}' exists on servers: {servers:?}")]
22    ToolCollision {
23        tool_name: String,
24        servers: Vec<String>,
25    },
26
27    #[error("Transport error: {0}")]
28    Transport(String),
29
30    #[error("Tool execution failed: {0}")]
31    ToolExecution(String),
32
33    #[error("Connection failed: {0}")]
34    ConnectionFailed(String),
35
36    #[error("Configuration error: {0}")]
37    Config(String),
38
39    #[error("Authentication error: {0}")]
40    Auth(String),
41
42    #[error("Resource not found: {0}")]
43    ResourceNotFound(String),
44
45    #[error("Prompt not found: {0}")]
46    PromptNotFound(String),
47
48    #[error("Invalid arguments: {0}")]
49    InvalidArguments(String),
50
51    #[error("Approval error: {0}")]
52    Approval(#[from] ApprovalError),
53
54    #[error("Server access denied: {0}")]
55    ServerAccessDenied(String),
56
57    #[error("Tool execution denied: {0}")]
58    ToolDenied(String),
59
60    #[error(transparent)]
61    Sdk(#[from] Box<rmcp::RmcpError>),
62
63    #[error(transparent)]
64    Io(#[from] std::io::Error),
65
66    #[error(transparent)]
67    Http(#[from] reqwest::Error),
68}
69
70/// Approval-specific errors.
71#[derive(Debug, Error)]
72pub enum ApprovalError {
73    /// Approval request not found (already resolved or expired).
74    #[error("Approval not found: {0}")]
75    NotFound(String),
76
77    /// Approval request already pending.
78    #[error("Approval already pending: {0}")]
79    AlreadyPending(String),
80
81    /// Response channel was closed.
82    #[error("Approval channel closed")]
83    ChannelClosed,
84
85    /// Approval request timed out.
86    #[error("Approval timed out: {0}")]
87    Timeout(String),
88
89    /// Policy evaluation failed.
90    #[error("Policy evaluation failed: {0}")]
91    PolicyError(String),
92}
smg_mcp/error.rs

smg_mcp/
error.rs
