huskies: merge 769

server/src/http/gateway/mcp.rs

@@ -19,6 +19,7 @@ const GATEWAY_TOOLS: &[&str] = &[
     "gateway_health",
     "init_project",
     "aggregate_pipeline_status",
+    "agents.list",
 ];
 
 /// Gateway tool definitions.
@@ -84,6 +85,14 @@ pub(crate) fn gateway_tool_definitions() -> Vec<Value> {
                 "properties": {}
             }
         }),
+        json!({
+            "name": "agents.list",
+            "description": "List all alive build agents currently registered with this gateway. Returns an array of agent objects with id, label, address, registered_at, last_seen, and assigned_project fields.",
+            "inputSchema": {
+                "type": "object",
+                "properties": {}
+            }
+        }),
     ]
 }
 
@@ -245,6 +254,7 @@ async fn handle_gateway_tool(
         "gateway_health" => handle_gateway_health_tool(state, id).await,
         "init_project" => handle_init_project_tool(params, state, id).await,
         "aggregate_pipeline_status" => handle_aggregate_pipeline_status_tool(state, id).await,
+        "agents.list" => handle_agents_list_tool(id),
         _ => JsonRpcResponse::error(id, -32601, format!("Unknown gateway tool: {tool_name}")),
     }
 }
@@ -426,6 +436,22 @@ async fn handle_aggregate_pipeline_status_tool(
     )
 }
 
+/// Handle the `agents.list` gateway tool — returns all alive build agents from the CRDT.
+fn handle_agents_list_tool(id: Option<Value>) -> JsonRpcResponse {
+    let agents = gateway::list_agents();
+    let agents_json = serde_json::to_value(&agents).unwrap_or(json!([]));
+    JsonRpcResponse::success(
+        id,
+        json!({
+            "content": [{
+                "type": "text",
+                "text": serde_json::to_string_pretty(&agents).unwrap_or_default()
+            }],
+            "agents": agents_json,
+        }),
+    )
+}
+
 /// Handle the `pipeline.get` read-RPC — returns the same shape as the old
 /// `GET /api/gateway/pipeline` endpoint: `{ "active": "...", "projects": {...} }`.
 async fn handle_pipeline_get(state: &GatewayState, id: Option<Value>) -> JsonRpcResponse {