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MCP client: spawn external tool servers, dispatch via JSON-RPC

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New mcp_client.rs: McpRegistry manages MCP server connections.
Spawns child processes, speaks JSON-RPC 2.0 over stdio. Discovers
tools via tools/list, dispatches calls via tools/call.

dispatch_with_agent falls through to MCP after checking internal
tools. McpRegistry lives on Agent (shared across forks).

Still needs: config-driven server startup, system prompt integration.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>
This commit is contained in:
Kent Overstreet 2026-04-09 11:45:39 -04:00
parent ec7e11db56
commit 8b5614ba99
4 changed files with 241 additions and 3 deletions
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14
src/config.rs
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@ -107,6 +107,8 @@ pub struct Config {
pub scoring_response_window: usize,
pub api_reasoning: String,
pub agent_types: Vec<String>,
#[serde(default)]
pub mcp_servers: Vec<McpServerConfig>,
/// Surface agent timeout in seconds.
#[serde(default)]
pub surface_timeout_secs: Option<u32>,
@ -164,6 +166,7 @@ impl Default for Config {
surface_timeout_secs: None,
surface_conversation_bytes: None,
surface_hooks: vec![],
mcp_servers: vec![],
}
}
}
@ -346,6 +349,16 @@ pub struct AppConfig {
pub models: HashMap<String, ModelConfig>,
#[serde(default = "default_model_name")]
pub default_model: String,
#[serde(default)]
pub mcp_servers: Vec<McpServerConfig>,
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct McpServerConfig {
pub name: String,
pub command: String,
#[serde(default)]
pub args: Vec<String>,
}
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
@ -436,6 +449,7 @@ impl Default for AppConfig {
system_prompt_file: None,
models: HashMap::new(),
default_model: String::new(),
mcp_servers: Vec::new(),
}
}
}