feat(config): add background task circuit breaker settings

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

assets/oh-my-opencode.schema.json

@@ -3699,6 +3699,32 @@
         "syncPollTimeoutMs": {
           "type": "number",
           "minimum": 60000
+        },
+        "maxToolCalls": {
+          "type": "integer",
+          "minimum": 10,
+          "maximum": 9007199254740991
+        },
+        "circuitBreaker": {
+          "type": "object",
+          "properties": {
+            "maxToolCalls": {
+              "type": "integer",
+              "minimum": 10,
+              "maximum": 9007199254740991
+            },
+            "windowSize": {
+              "type": "integer",
+              "minimum": 5,
+              "maximum": 9007199254740991
+            },
+            "repetitionThresholdPercent": {
+              "type": "number",
+              "exclusiveMinimum": 0,
+              "maximum": 100
+            }
+          },
+          "additionalProperties": false
         }
       },
       "additionalProperties": false

src/config/schema/background-task-circuit-breaker.test.ts

@@ -0,0 +1,59 @@
+import { describe, expect, test } from "bun:test"
+import { ZodError } from "zod/v4"
+import { BackgroundTaskConfigSchema } from "./background-task"
+
+describe("BackgroundTaskConfigSchema.circuitBreaker", () => {
+  describe("#given valid circuit breaker settings", () => {
+    test("#when parsed #then returns nested config", () => {
+      const result = BackgroundTaskConfigSchema.parse({
+        circuitBreaker: {
+          maxToolCalls: 150,
+          windowSize: 10,
+          repetitionThresholdPercent: 70,
+        },
+      })
+
+      expect(result.circuitBreaker).toEqual({
+        maxToolCalls: 150,
+        windowSize: 10,
+        repetitionThresholdPercent: 70,
+      })
+    })
+  })
+
+  describe("#given windowSize below minimum", () => {
+    test("#when parsed #then throws ZodError", () => {
+      let thrownError: unknown
+
+      try {
+        BackgroundTaskConfigSchema.parse({
+          circuitBreaker: {
+            windowSize: 4,
+          },
+        })
+      } catch (error) {
+        thrownError = error
+      }
+
+      expect(thrownError).toBeInstanceOf(ZodError)
+    })
+  })
+
+  describe("#given repetitionThresholdPercent is zero", () => {
+    test("#when parsed #then throws ZodError", () => {
+      let thrownError: unknown
+
+      try {
+        BackgroundTaskConfigSchema.parse({
+          circuitBreaker: {
+            repetitionThresholdPercent: 0,
+          },
+        })
+      } catch (error) {
+        thrownError = error
+      }
+
+      expect(thrownError).toBeInstanceOf(ZodError)
+    })
+  })
+})

src/config/schema/background-task.ts

@@ -1,5 +1,11 @@
 import { z } from "zod"
 
+const CircuitBreakerConfigSchema = z.object({
+  maxToolCalls: z.number().int().min(10).optional(),
+  windowSize: z.number().int().min(5).optional(),
+  repetitionThresholdPercent: z.number().gt(0).max(100).optional(),
+})
+
 export const BackgroundTaskConfigSchema = z.object({
   defaultConcurrency: z.number().min(1).optional(),
   providerConcurrency: z.record(z.string(), z.number().min(0)).optional(),
@@ -13,6 +19,7 @@ export const BackgroundTaskConfigSchema = z.object({
   syncPollTimeoutMs: z.number().min(60000).optional(),
   /** Maximum tool calls per subagent task before circuit breaker triggers (default: 200, minimum: 10). Prevents runaway loops from burning unlimited tokens. */
   maxToolCalls: z.number().int().min(10).optional(),
+  circuitBreaker: CircuitBreakerConfigSchema.optional(),
 })
 
 export type BackgroundTaskConfig = z.infer<typeof BackgroundTaskConfigSchema>