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Add MCP server orchestration so configured stdio tools can be discovered and called

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The runtime crate already had typed MCP config parsing, bootstrap metadata,
and stdio JSON-RPC transport primitives, but it lacked the stateful layer
that owns configured subprocesses and routes discovered tools back to the
right server. This change adds a thin lazy McpServerManager in mcp_stdio,
keeps unsupported transports explicit, and locks the behavior with
subprocess-backed discovery, routing, reuse, shutdown, and error tests.

Constraint: Keep the change narrow to the runtime crate and stdio transport only
Constraint: Reuse existing MCP config/bootstrap/process helpers instead of adding new dependencies
Rejected: Eagerly spawn all configured servers at construction | unnecessary startup cost and failure coupling
Rejected: Spawn a fresh process per request | defeats lifecycle management and tool routing cache
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: Keep higher-level runtime/session integration separate until a caller needs this manager surface
Tested: cargo fmt --all; cargo clippy -p runtime --all-targets -- -D warnings; cargo test -p runtime
Not-tested: Integration into conversation/runtime flows outside direct manager APIs
This commit is contained in:
Yeachan-Heo
2026-03-31 23:31:37 +00:00
parent d5d99af2d0
commit 1e5002b521
2 changed files with 767 additions and 7 deletions
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9
rust/crates/runtime/src/lib.rs
View File

@@ -46,10 +46,11 @@ pub use mcp_client::{
};
pub use mcp_stdio::{
spawn_mcp_stdio_process, JsonRpcError, JsonRpcId, JsonRpcRequest, JsonRpcResponse,
McpInitializeClientInfo, McpInitializeParams, McpInitializeResult, McpInitializeServerInfo,
McpListResourcesParams, McpListResourcesResult, McpListToolsParams, McpListToolsResult,
McpReadResourceParams, McpReadResourceResult, McpResource, McpResourceContents,
McpStdioProcess, McpTool, McpToolCallContent, McpToolCallParams, McpToolCallResult,
ManagedMcpTool, McpInitializeClientInfo, McpInitializeParams, McpInitializeResult,
McpInitializeServerInfo, McpListResourcesParams, McpListResourcesResult, McpListToolsParams,
McpListToolsResult, McpReadResourceParams, McpReadResourceResult, McpResource,
McpResourceContents, McpServerManager, McpServerManagerError, McpStdioProcess, McpTool,
McpToolCallContent, McpToolCallParams, McpToolCallResult, UnsupportedMcpServer,
};
pub use oauth::{
code_challenge_s256, generate_pkce_pair, generate_state, loopback_redirect_uri,