mcp-server: handle channel tools locally

Hybrid approach: forward memory/journal tools to daemon via socket,
but dispatch channel tools locally. Avoids extra daemon hop for
channel operations.

Adds channel_tool_definitions(), is_channel_tool(), dispatch_channel_tool()
and merges channel tools into tools/list response.

Co-Authored-By: Kent Overstreet <kent.overstreet@linux.dev>

src/mcp-server.rs

@@ -1,7 +1,7 @@
 // mcp-server — MCP server for Claude Code integration
 //
-// Speaks JSON-RPC over stdio (to Claude). Forwards tool calls to the
-// consciousness daemon over Unix socket (~/.consciousness/mcp.sock).
+// Speaks JSON-RPC over stdio (to Claude). Forwards memory/journal tool calls
+// to the consciousness daemon. Handles channel tools locally.
 //
 // Protocol: https://modelcontextprotocol.io/specification
 
@@ -12,6 +12,8 @@ use std::os::unix::net::UnixStream;
 use std::io::{BufReader, BufWriter};
 use std::path::PathBuf;
 
+use consciousness::agent::tools::channels;
+
 // ── JSON-RPC types ──────────────────────────────────────────────
 
 #[derive(Deserialize)]
@@ -68,6 +70,39 @@ fn respond_error(id: Value, code: i64, message: &str) {
     let _ = stdout.flush();
 }
 
+// ── Channel tools (handled locally) ─────────────────────────────
+
+fn channel_tool_definitions() -> Vec<Value> {
+    channels::tools().into_iter()
+        .map(|t| json!({
+            "name": t.name,
+            "description": t.description,
+            "inputSchema": serde_json::from_str::<Value>(t.parameters_json).unwrap_or(json!({})),
+        }))
+        .collect()
+}
+
+fn is_channel_tool(name: &str) -> bool {
+    name.starts_with("channel_")
+}
+
+fn dispatch_channel_tool(name: &str, args: &Value) -> Result<String, String> {
+    let tools = channels::tools();
+    let tool = tools.iter().find(|t| t.name == name);
+    let Some(tool) = tool else {
+        return Err(format!("unknown channel tool: {name}"));
+    };
+
+    // Run async handler on a blocking runtime
+    let rt = tokio::runtime::Builder::new_current_thread()
+        .enable_all()
+        .build()
+        .map_err(|e| e.to_string())?;
+    let local = tokio::task::LocalSet::new();
+    local.block_on(&rt, (tool.handler)(None, args.clone()))
+        .map_err(|e| e.to_string())
+}
+
 // ── Daemon connection ───────────────────────────────────────────
 
 fn socket_path() -> PathBuf {
@@ -187,14 +222,44 @@ fn main() {
             }
 
             "tools/list" => {
+                // Merge daemon tools with local channel tools
                 match client.request("tools/list", None) {
-                    Ok(result) => respond(req.id, result),
+                    Ok(mut result) => {
+                        // Add channel tools to the list
+                        if let Some(tools) = result.get_mut("tools").and_then(|t| t.as_array_mut()) {
+                            tools.extend(channel_tool_definitions());
+                        }
+                        respond(req.id, result);
+                    }
                     Err(e) => respond_error(req.id, -32000, &e),
                 }
             }
 
             "tools/call" => {
-                // Forward params directly - daemon expects same structure
+                let name = req.params.get("name")
+                    .and_then(|v| v.as_str())
+                    .unwrap_or("");
+                let args = req.params.get("arguments")
+                    .cloned()
+                    .unwrap_or(json!({}));
+
+                if is_channel_tool(name) {
+                    // Handle channel tools locally
+                    match dispatch_channel_tool(name, &args) {
+                        Ok(text) => {
+                            respond(req.id, json!({
+                                "content": [{"type": "text", "text": text}]
+                            }));
+                        }
+                        Err(e) => {
+                            respond(req.id, json!({
+                                "content": [{"type": "text", "text": e}],
+                                "isError": true
+                            }));
+                        }
+                    }
+                } else {
+                    // Forward to daemon
                     match client.request("tools/call", Some(req.params.clone())) {
                         Ok(result) => respond(req.id, result),
                         Err(e) => {
@@ -205,6 +270,7 @@ fn main() {
                         }
                     }
                 }
+            }
 
             _ => {
                 respond_error(req.id, -32601, &format!("unknown method: {}", req.method));