fix(core): continue after unavailable tool calls

packages/core/src/session/runner/llm.ts

@@ -365,6 +365,15 @@ const layer = Layer.effect(
               return
             }
             needsContinuation = true
+            if (!advertisedTools.has(event.name)) {
+              yield* serialized(
+                publisher.failUnsettledTools({
+                  type: "tool.execution",
+                  message: `Tool is not available for this request: ${event.name}`,
+                }),
+              )
+              return
+            }
             const assistantMessageID = yield* publisher.assistantMessageID(event.id)
             ownedToolFibers.push(
               yield* Effect.uninterruptibleMask((restore) =>

packages/core/test/config/plugin.test.ts

@@ -273,9 +273,9 @@ function withLocation<A, E, R>(
 function mutablePlugin(description: string) {
   const plugin = pathToFileURL(path.join(import.meta.dir, "../../../plugin/src/v2/promise/index.ts")).href
   return `
-import { define } from ${JSON.stringify(plugin)}
+import { Plugin } from ${JSON.stringify(plugin)}
 
-export default EffectPlugin.define({
+export default Plugin.define({
   id: "mutable-plugin",
   setup: async (ctx) => {
     await ctx.agent.transform((agents) => {

packages/core/test/session-runner.test.ts

@@ -2674,7 +2674,10 @@ describe("SessionRunnerLLM", () => {
             {
               type: "tool",
               id: "call-missing",
-              state: { status: "error", error: { message: "Unknown tool: missing" } },
+              state: {
+                status: "error",
+                error: { type: "tool.execution", message: "Tool is not available for this request: missing" },
+              },
             },
           ],
         },