consciousness-mcp: forward to daemon socket instead of direct calls

Now connects to ~/.consciousness/mcp.sock and forwards tool calls to
the consciousness daemon instead of calling tool handlers directly.

Requires the consciousness daemon to be running with MCP server.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

Cargo.lock

@@ -550,12 +550,13 @@ dependencies = [
  "redb",
  "regex",
  "rkyv",
+ "rusqlite",
  "rustls",
  "rustls-native-certs",
  "serde",
  "serde_json",
  "serde_urlencoded",
- "skillratings",
+ "textwrap",
  "tokenizers",
  "tokio",
  "tokio-rustls",
@@ -985,6 +986,18 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "fallible-iterator"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2acce4a10f12dc2fb14a218589d4f1f62ef011b2d0cc4b3cb1bba8e94da14649"
+
+[[package]]
+name = "fallible-streaming-iterator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
+
 [[package]]
 name = "fancy-regex"
 version = "0.11.0"
@@ -1283,6 +1296,15 @@ version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4f467dd6dccf739c208452f8014c75c18bb8301b050ad1cfb27153803edb0f51"
 
+[[package]]
+name = "hashlink"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7382cf6263419f2d8df38c55d7da83da5c18aef87fc7a7fc1fb1e344edfe14c1"
+dependencies = [
+ "hashbrown 0.15.5",
+]
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -1592,6 +1614,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "libsqlite3-sys"
+version = "0.35.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "133c182a6a2c87864fe97778797e46c7e999672690dc9fa3ee8e241aa4a9c13f"
+dependencies = [
+ "cc",
+ "pkg-config",
+ "vcpkg",
+]
+
 [[package]]
 name = "line-clipping"
 version = "0.3.7"
@@ -2489,6 +2522,20 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "rusqlite"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "165ca6e57b20e1351573e3729b958bc62f0e48025386970b6e4d29e7a7e71f3f"
+dependencies = [
+ "bitflags 2.11.0",
+ "fallible-iterator",
+ "fallible-streaming-iterator",
+ "hashlink",
+ "libsqlite3-sys",
+ "smallvec",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"
@@ -2752,12 +2799,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b2aa850e253778c88a04c3d7323b043aeda9d3e30d5971937c1855769763678e"
 
-[[package]]
-name = "skillratings"
-version = "0.28.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a6ee7559737c1adcd9184f168a04dc360c84878907c3ecc5c33c2320be1d47a"
-
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -2770,6 +2811,12 @@ version = "1.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
 
+[[package]]
+name = "smawk"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7c388c1b5e93756d0c740965c41e8822f866621d41acbdf6336a6a168f8840c"
+
 [[package]]
 name = "socket2"
 version = "0.6.3"
@@ -2949,6 +2996,17 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "textwrap"
+version = "0.16.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c13547615a44dc9c452a8a534638acdf07120d4b6847c8178705da06306a3057"
+dependencies = [
+ "smawk",
+ "unicode-linebreak",
+ "unicode-width",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"
@@ -3469,6 +3527,12 @@ version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
 
+[[package]]
+name = "unicode-linebreak"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b09c83c3c29d37506a3e260c08c03743a6bb66a9cd432c6934ab501a190571f"
+
 [[package]]
 name = "unicode-normalization-alignments"
 version = "0.1.12"
@@ -3537,6 +3601,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "vcpkg"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
+
 [[package]]
 name = "version_check"
 version = "0.9.5"

src/mcp-server.rs

@@ -1,13 +1,16 @@
 // mcp-server — MCP server for Claude Code integration
 //
-// Speaks JSON-RPC over stdio. Exposes memory tools and channel
+// Speaks JSON-RPC over stdio (to Claude). Forwards tool calls to the
-// operations. Replaces the Python MCP bridge entirely.
+// consciousness daemon over Unix socket (~/.consciousness/mcp.sock).
 //
 // Protocol: https://modelcontextprotocol.io/specification
 
 use serde::{Deserialize, Serialize};
 use serde_json::{json, Value};
 use std::io::{self, BufRead, Write};
+use std::os::unix::net::UnixStream;
+use std::io::{BufReader, BufWriter};
+use std::path::PathBuf;
 
 // ── JSON-RPC types ──────────────────────────────────────────────
 
@@ -35,6 +38,16 @@ struct ErrorResponse {
     id: Value,
 }
 
+#[derive(Deserialize)]
+struct DaemonResponse {
+    #[allow(dead_code)]
+    jsonrpc: String,
+    result: Option<Value>,
+    error: Option<Value>,
+    #[allow(dead_code)]
+    id: Value,
+}
+
 fn respond(id: Value, result: Value) {
     let resp = Response { jsonrpc: "2.0".into(), result, id };
     let json = serde_json::to_string(&resp).unwrap();
@@ -55,52 +68,83 @@ fn respond_error(id: Value, code: i64, message: &str) {
     let _ = stdout.flush();
 }
 
-fn notify(method: &str, params: Value) {
+// ── Daemon connection ───────────────────────────────────────────
-    let json = serde_json::to_string(&json!({
+
-        "jsonrpc": "2.0",
+fn socket_path() -> PathBuf {
-        "method": method,
+    dirs::home_dir()
-        "params": params,
+        .unwrap_or_default()
-    })).unwrap();
+        .join(".consciousness/mcp.sock")
-    let mut stdout = io::stdout().lock();
-    let _ = writeln!(stdout, "{json}");
-    let _ = stdout.flush();
 }
 
-// ── Tool definitions ────────────────────────────────────────────
+struct DaemonClient {
-
+    reader: BufReader<UnixStream>,
-fn tool_definitions() -> Vec<Value> {
+    writer: BufWriter<UnixStream>,
-    consciousness::agent::tools::tools().into_iter()
+    next_id: u64,
-        .map(|t| json!({
-            "name": t.name,
-            "description": t.description,
-            "inputSchema": serde_json::from_str::<Value>(t.parameters_json).unwrap_or(json!({})),
-        }))
-        .collect()
 }
 
-// ── Tool dispatch ───────────────────────────────────────────────
+impl DaemonClient {
+    fn connect() -> Result<Self, String> {
+        let path = socket_path();
+        let stream = UnixStream::connect(&path)
+            .map_err(|e| format!("connect to {:?}: {}", path, e))?;
+        let reader = BufReader::new(stream.try_clone().map_err(|e| e.to_string())?);
+        let writer = BufWriter::new(stream);
+        Ok(Self { reader, writer, next_id: 0 })
+    }
 
-fn dispatch_tool(name: &str, args: &Value) -> Result<String, String> {
+    fn request(&mut self, method: &str, params: Option<Value>) -> Result<Value, String> {
-    let tools = consciousness::agent::tools::tools();
+        self.next_id += 1;
-    let tool = tools.iter().find(|t| t.name == name);
+        let req = json!({
-    let Some(tool) = tool else {
+            "jsonrpc": "2.0",
-        return Err(format!("unknown tool: {name}"));
+            "id": self.next_id,
-    };
+            "method": method,
+            "params": params
+        });
+        let mut line = serde_json::to_string(&req).map_err(|e| e.to_string())?;
+        line.push('\n');
+        self.writer.write_all(line.as_bytes()).map_err(|e| e.to_string())?;
+        self.writer.flush().map_err(|e| e.to_string())?;
 
-    // Run async handler on a blocking runtime
+        let mut buf = String::new();
-    let rt = tokio::runtime::Builder::new_current_thread()
+        self.reader.read_line(&mut buf).map_err(|e| e.to_string())?;
-        .enable_all()
+        let resp: DaemonResponse = serde_json::from_str(&buf)
-        .build()
+            .map_err(|e| format!("parse response: {}", e))?;
-        .map_err(|e| e.to_string())?;
+
-    let local = tokio::task::LocalSet::new();
+        if let Some(err) = resp.error {
-    local.block_on(&rt, (tool.handler)(None, args.clone()))
+            return Err(format!("daemon error: {}", err));
-        .map_err(|e| e.to_string())
+        }
+        Ok(resp.result.unwrap_or(Value::Null))
+    }
 }
 
 // ── Main loop ───────────────────────────────────────────────────
 
 fn main() {
     eprintln!("consciousness-mcp: starting");
+
+    // Connect to daemon
+    let mut client = match DaemonClient::connect() {
+        Ok(c) => c,
+        Err(e) => {
+            eprintln!("consciousness-mcp: failed to connect to daemon: {}", e);
+            eprintln!("consciousness-mcp: is consciousness running?");
+            std::process::exit(1);
+        }
+    };
+
+    // Initialize with daemon
+    if let Err(e) = client.request("initialize", Some(json!({
+        "protocolVersion": "2024-11-05",
+        "capabilities": {},
+        "clientInfo": {"name": "consciousness-mcp", "version": "0.4.0"}
+    }))) {
+        eprintln!("consciousness-mcp: daemon initialize failed: {}", e);
+        std::process::exit(1);
+    }
+    let _ = client.request("notifications/initialized", None);
+
+    eprintln!("consciousness-mcp: connected to daemon");
+
     let stdin = io::stdin();
     let reader = stdin.lock();
 
@@ -132,7 +176,7 @@ fn main() {
                         "tools": {}
                     },
                     "serverInfo": {
-                        "name": "consciousness",
+                        "name": "consciousness-mcp",
                         "version": "0.4.0"
                     }
                 }));
@@ -143,8 +187,10 @@ fn main() {
             }
 
             "tools/list" => {
-                let tools = tool_definitions();
+                match client.request("tools/list", None) {
-                respond(req.id, json!({ "tools": tools }));
+                    Ok(result) => respond(req.id, result),
+                    Err(e) => respond_error(req.id, -32000, &e),
+                }
             }
 
             "tools/call" => {
@@ -155,12 +201,11 @@ fn main() {
                     .cloned()
                     .unwrap_or(json!({}));
 
-                match dispatch_tool(name, &args) {
+                match client.request("tools/call", Some(json!({
-                    Ok(text) => {
+                    "name": name,
-                        respond(req.id, json!({
+                    "arguments": args
-                            "content": [{"type": "text", "text": text}]
+                }))) {
-                        }));
+                    Ok(result) => respond(req.id, result),
-                    }
                     Err(e) => {
                         respond(req.id, json!({
                             "content": [{"type": "text", "text": e}],