Revert "Merge pull request #1951 from edxeth/feat/custom-agents"

This reverts commit 47e300b17e, reversing
changes made to 243ce1b7e8.

src/tools/delegate-task/subagent-resolver.test.ts

@@ -79,56 +79,4 @@ describe("resolveSubagentExecution", () => {
       error: "network timeout",
     })
   })
-
-  test("uses inherited model for custom agents without explicit model", async () => {
-    //#given
-    const args = createBaseArgs({ subagent_type: "translator" })
-    const executorCtx = createExecutorContext(async () => ({
-      data: [{ name: "translator", mode: "subagent" }],
-    }))
-
-    //#when
-    const result = await resolveSubagentExecution(
-      args,
-      executorCtx,
-      "sisyphus",
-      "deep",
-      "openai/gpt-5.3-codex",
-      "anthropic/claude-opus-4-6",
-    )
-
-    //#then
-    expect(result.error).toBeUndefined()
-    expect(result.agentToUse).toBe("translator")
-    expect(result.categoryModel).toEqual({
-      providerID: "openai",
-      modelID: "gpt-5.3-codex",
-    })
-  })
-
-  test("uses system default model when inherited model is unavailable", async () => {
-    //#given
-    const args = createBaseArgs({ subagent_type: "translator" })
-    const executorCtx = createExecutorContext(async () => ({
-      data: [{ name: "translator", mode: "subagent" }],
-    }))
-
-    //#when
-    const result = await resolveSubagentExecution(
-      args,
-      executorCtx,
-      "sisyphus",
-      "deep",
-      undefined,
-      "anthropic/claude-opus-4-6",
-    )
-
-    //#then
-    expect(result.error).toBeUndefined()
-    expect(result.agentToUse).toBe("translator")
-    expect(result.categoryModel).toEqual({
-      providerID: "anthropic",
-      modelID: "claude-opus-4-6",
-    })
-  })
 })

src/tools/delegate-task/subagent-resolver.ts

@@ -15,9 +15,7 @@ export async function resolveSubagentExecution(
   args: DelegateTaskArgs,
   executorCtx: ExecutorContext,
   parentAgent: string | undefined,
-  categoryExamples: string,
-  inheritedModel?: string,
-  systemDefaultModel?: string,
+  categoryExamples: string
 ): Promise<{ agentToUse: string; categoryModel: { providerID: string; modelID: string; variant?: string } | undefined; fallbackChain?: FallbackEntry[]; error?: string }> {
   const { client, agentOverrides } = executorCtx
 
@@ -126,16 +124,6 @@ Create the work plan directly - that's your job as the planning agent.`,
     if (!categoryModel && matchedAgent.model) {
       categoryModel = matchedAgent.model
     }
-
-    if (!categoryModel) {
-      const fallbackModel = inheritedModel ?? systemDefaultModel
-      if (fallbackModel) {
-        const parsedFallback = parseModelString(fallbackModel)
-        if (parsedFallback) {
-          categoryModel = parsedFallback
-        }
-      }
-    }
   } catch (error) {
     const errorMessage = error instanceof Error ? error.message : String(error)
     log("[delegate-task] Failed to resolve subagent execution", {

src/tools/delegate-task/tools.ts

@@ -226,14 +226,7 @@ export function createDelegateTask(options: DelegateTaskToolOptions): ToolDefini
           return executeUnstableAgentTask(args, ctx, options, parentContext, agentToUse, categoryModel, systemContent, actualModel)
         }
       } else {
-        const resolution = await resolveSubagentExecution(
-          args,
-          options,
-          parentContext.agent,
-          categoryExamples,
-          inheritedModel,
-          systemDefaultModel,
-        )
+        const resolution = await resolveSubagentExecution(args, options, parentContext.agent, categoryExamples)
         if (resolution.error) {
           return resolution.error
         }