feat(acp): route session/setTitle to the new schema types

Wires the SetSessionTitleRequest / SetSessionTitleResponse types into
the agent-side JSON-RPC dispatch tables.

Companion to agentclientprotocol/agent-client-protocol#1199,
which adds the schema definitions for session/setTitle. This PR is the
Rust SDK half of the round trip: once the schema crate ships a release
with the new types, ACP-backed agents can implement Agent::set_session_title
and have it dispatched here.

Author: daniel-agentee

Cargo.lock

@@ -29,7 +29,7 @@ agent-client-protocol-trace-viewer = { path = "src/agent-client-protocol-trace-v
 yopo = { package = "agent-client-protocol-yopo", path = "src/yopo" }
 
 # Protocol
-agent-client-protocol-schema = { version = "=0.13.0", features = ["tracing"] }
+agent-client-protocol-schema = { version = "=0.13.5", features = ["tracing"] }
 
 # Core async runtime
 tokio = { version = "1.52", features = ["full"] }
@@ -69,7 +69,6 @@ rustc-hash = "2.1.1"
 shell-words = "1.1"
 strip-ansi-escapes = "0.2"
 
-
 # Proc macros
 quote = "1"
 syn = { version = "2", features = ["full", "extra-traits"] }
@@ -78,6 +77,11 @@ syn = { version = "2", features = ["full", "extra-traits"] }
 expect-test = "1.5"
 regex = "1.12.2"
 
+[patch.crates-io]
+# Temporary: pull `session/setTitle` schema support before it ships on crates.io.
+# Remove once https://github.com/agentclientprotocol/agent-client-protocol/pull/1199 releases.
+agent-client-protocol-schema = { git = "https://github.com/daniel-agentee/agent-client-protocol", rev = "df5ce7793a132206a67a64e9c082a8228000e6b5" }
+
 [workspace.lints.rust]
 future_incompatible = { level = "warn", priority = -1 }
 let-underscore = "warn"

Cargo.toml

@@ -22,16 +22,14 @@ unstable = [
     "unstable_message_id",
     "unstable_session_additional_directories",
     "unstable_session_fork",
-    "unstable_session_model",
     "unstable_session_usage",
 ]
 unstable_auth_methods = ["agent-client-protocol-schema/unstable_auth_methods"]
 unstable_boolean_config = ["agent-client-protocol-schema/unstable_boolean_config"]
-unstable_logout = ["agent-client-protocol-schema/unstable_logout"]
+unstable_logout = []
 unstable_message_id = ["agent-client-protocol-schema/unstable_message_id"]
-unstable_session_additional_directories = ["agent-client-protocol-schema/unstable_session_additional_directories"]
+unstable_session_additional_directories = []
 unstable_session_fork = ["agent-client-protocol-schema/unstable_session_fork"]
-unstable_session_model = ["agent-client-protocol-schema/unstable_session_model"]
 unstable_session_usage = ["agent-client-protocol-schema/unstable_session_usage"]
 
 [dependencies]

src/agent-client-protocol/Cargo.toml

@@ -4,13 +4,12 @@ use crate::schema::{
     LoadSessionRequest, LoadSessionResponse, NewSessionRequest, NewSessionResponse, PromptRequest,
     PromptResponse, ResumeSessionRequest, ResumeSessionResponse, SetSessionConfigOptionRequest,
     SetSessionConfigOptionResponse, SetSessionModeRequest, SetSessionModeResponse,
+    SetSessionTitleRequest, SetSessionTitleResponse,
 };
 #[cfg(feature = "unstable_session_fork")]
 use crate::schema::{ForkSessionRequest, ForkSessionResponse};
 #[cfg(feature = "unstable_logout")]
 use crate::schema::{LogoutRequest, LogoutResponse};
-#[cfg(feature = "unstable_session_model")]
-use crate::schema::{SetSessionModelRequest, SetSessionModelResponse};
 
 impl_jsonrpc_request!(InitializeRequest, InitializeResponse, "initialize");
 impl_jsonrpc_request!(AuthenticateRequest, AuthenticateResponse, "authenticate");
@@ -30,13 +29,12 @@ impl_jsonrpc_request!(
     SetSessionConfigOptionResponse,
     "session/set_config_option"
 );
-
-#[cfg(feature = "unstable_session_model")]
 impl_jsonrpc_request!(
-    SetSessionModelRequest,
-    SetSessionModelResponse,
-    "session/set_model"
+    SetSessionTitleRequest,
+    SetSessionTitleResponse,
+    "session/setTitle"
 );
+
 #[cfg(feature = "unstable_session_fork")]
 impl_jsonrpc_request!(ForkSessionRequest, ForkSessionResponse, "session/fork");
 impl_jsonrpc_request!(

src/agent-client-protocol/src/schema/client_to_agent/requests.rs

@@ -21,9 +21,8 @@ impl_jsonrpc_request_enum!(ClientRequest {
     CloseSessionRequest => "session/close",
     SetSessionModeRequest => "session/set_mode",
     SetSessionConfigOptionRequest => "session/set_config_option",
+    SetSessionTitleRequest => "session/setTitle",
     PromptRequest => "session/prompt",
-    #[cfg(feature = "unstable_session_model")]
-    SetSessionModelRequest => "session/set_model",
     [ext] ExtMethodRequest,
 });
 

src/agent-client-protocol/src/schema/enum_impls.rs

@@ -101,8 +101,7 @@ macro_rules! impl_jsonrpc_notification {
 /// impl_jsonrpc_request_enum!(ClientRequest {
 ///     InitializeRequest => "initialize",
 ///     PromptRequest => "session/prompt",
-///     #[cfg(feature = "unstable_session_model")]
-///     SetSessionModelRequest => "session/set_model",
+///     SetSessionConfigOptionRequest => "session/set_config_option",
 ///     [ext] ExtMethodRequest,
 /// });
 /// ```