Plan Mode Timeout (Unexpected EOF) While creating artifacts with Claude Opus on WOA

Google Antigravity
,
1

Environment:

  • Client: Windows on ARM (Snapdragon 8CX Gen 3)

  • Model: Claude 4.6 Opus / Sonnet (Plan Mode)

Issue: Frequent generation failures when creating Artifacts in Plan Mode. The stream consistently cuts off around the 45s mark with an unexpected EOF error.

Error Snippet:

Error: agent executor error: stream reading error: unexpected EOF Tags: [streaming_duration: 45.0148626s] Trajectory ID: 8627550e-f89b-4d56

Raw Log:

Trajectory ID: 8627550e-f89b-4d56-
Error: agent executor error: stream reading error: unexpected EOF: stream reading error: unexpected EOF
(1) attached stack trace
– stack trace:
| google3/third_party/jetski/cortex/cortex.(*CascadeManager).executeHelper.func1
| third_party/jetski/cortex/cascade_manager.go:2096
| […repeated from below…]
Wraps: (2) agent executor error
Wraps: (3) tags: map[stream_receive_count:4 streaming_duration:45.0148626s]
Wraps: (4) attached stack trace
– stack trace:
| google3/third_party/gemini_coder/framework/generator/generator.(*streamResponseHandler).processStream
| third_party/gemini_coder/framework/generator/stream_handler.go:353
| google3/third_party/gemini_coder/framework/generator/generator.(*PlannerGenerator).attemptGenerate
| third_party/gemini_coder/framework/generator/planner_generator.go:454
| google3/third_party/gemini_coder/framework/generator/generator.(*PlannerGenerator).generateWithAPIRetry
| third_party/gemini_coder/framework/generator/planner_generator.go:288
| google3/third_party/gemini_coder/framework/generator/generator.(*PlannerGenerator).generateWithModelOutputRetry
| third_party/gemini_coder/framework/generator/planner_generator.go:156
| google3/third_party/gemini_coder/framework/generator/generator.(*PlannerGenerator).Generate
| third_party/gemini_coder/framework/generator/planner_generator.go:94
| google3/third_party/gemini_coder/framework/executor/executor.(*Executor).executeLoop
| third_party/gemini_coder/framework/executor/executor.go:355
| google3/third_party/gemini_coder/framework/executor/executor.(*Executor).Execute
| third_party/gemini_coder/framework/executor/executor.go:277
| google3/third_party/jetski/cortex/cortex.(*CascadeManager).executeHelper.func1
| third_party/jetski/cortex/cascade_manager.go:2061
| google3/third_party/jetski/cortex/cortex.(*CascadeManager).executeHelper.func2
| third_party/jetski/cortex/cascade_manager.go:2144
| runtime.goexit
| third_party/go/gc/src/runtime/asm_arm64.s:1447
Wraps: (5) stream reading error: unexpected EOF
Wraps: (6) stream reading error
Wraps: (7) unexpected EOF
Error types: (1) *withstack.withStack (2) *errutil.withPrefix (3) *go_utils.withTags (4) *withstack.withStack (5) *errutil.withPrefix (6) *fmt.wrapError (7) *errors.errorString

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