runtime: add execution concurrency limits

apps/mcp-server/src/main.rs

@@ -6,7 +6,7 @@ mod session;
 use std::{env, net::SocketAddr, time::Duration};
 
 use crank_registry::{PostgresPoolConfig, PostgresRegistry};
-use crank_runtime::SecretCrypto;
+use crank_runtime::{RuntimeExecutor, RuntimeLimits, SecretCrypto};
 use sqlx::postgres::PgConnectOptions;
 use tokio::net::TcpListener;
 use tracing::info;
@@ -31,16 +31,22 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         .unwrap_or_else(|| Duration::from_secs(5));
     let socket_addr: SocketAddr = bind_addr.parse()?;
     let pool_config = PostgresPoolConfig::from_env()?;
+    let runtime_limits = RuntimeLimits::from_env()?;
     let registry = PostgresRegistry::connect_with_options_and_pool_config(
         database_options_from_env()?,
         pool_config,
     )
     .await?;
     let secret_crypto = SecretCrypto::new(&env::var("CRANK_MASTER_KEY")?)?;
-    let app = build_app(registry, refresh_interval, base_url, secret_crypto);
+    let runtime = RuntimeExecutor::with_limits(runtime_limits);
+    let app = build_app(registry, refresh_interval, base_url, secret_crypto, runtime);
     let listener = TcpListener::bind(socket_addr).await?;
 
     info!(
+        runtime_max_concurrent_unary = runtime_limits.max_concurrent_unary,
+        runtime_max_concurrent_window = runtime_limits.max_concurrent_window,
+        runtime_max_concurrent_sessions = runtime_limits.max_concurrent_sessions,
+        runtime_max_concurrent_jobs = runtime_limits.max_concurrent_jobs,
         max_connections = pool_config.max_connections,
         min_connections = pool_config.min_connections,
         acquire_timeout_ms = pool_config.acquire_timeout_ms,
@@ -106,7 +112,7 @@ mod tests {
         CreateAgentRequest, CreatePlatformApiKeyRequest, ListInvocationLogsQuery, PostgresRegistry,
         PublishAgentRequest, PublishRequest,
     };
-    use crank_runtime::SecretCrypto;
+    use crank_runtime::{RuntimeExecutor, SecretCrypto};
     use crank_schema::{Schema, SchemaKind};
     use futures_util::stream;
     use serde_json::{Value, json};
@@ -173,6 +179,7 @@ mod tests {
             refresh_interval,
             public_base_url,
             SecretCrypto::new("test-master-key").unwrap(),
+            RuntimeExecutor::new(),
         )
     }