Description
The Copilot CLI terminal renderer corrupts streamed output, producing doubled characters, truncated tokens, and repeated lines. This affects both the thinking/reasoning phase output and the final assistant response output.
Steps to Reproduce
- Ask Copilot CLI any question that produces a moderately long response
- Observe the output as it streams to the terminal
Observed Behavior
Output is visibly corrupted during streaming. Examples seen:
- Partial tokens rendered before full token is available (e.g.
apil instead of apiVersion)
- Characters doubled mid-word (e.g.
obserrvability, permpermissions)
- Words repeated mid-sentence (e.g.
New ReliNew Relic, useruser)
- Lines repeated (e.g.
metadata: block appearing twice)
- Thinking/reasoning tokens streamed visibly with same corruption artifacts
Example corrupted output observed:
apil
apiVersion: rbac.authorization.k8s.io/v1
...
- apiGroups: [piGroups: [""]
Expected Behavior
Output should render cleanly with no corruption, doubled characters, or repeated lines.
Environment
- Copilot CLI version: 1.0.61
- OS: Darwin (macOS)
Notes
The underlying content being generated is correct — the issue is purely in how the CLI streams and renders tokens to the terminal.
Description
The Copilot CLI terminal renderer corrupts streamed output, producing doubled characters, truncated tokens, and repeated lines. This affects both the thinking/reasoning phase output and the final assistant response output.
Steps to Reproduce
Observed Behavior
Output is visibly corrupted during streaming. Examples seen:
apilinstead ofapiVersion)obserrvability,permpermissions)New ReliNew Relic,useruser)metadata:block appearing twice)Example corrupted output observed:
Expected Behavior
Output should render cleanly with no corruption, doubled characters, or repeated lines.
Environment
Notes
The underlying content being generated is correct — the issue is purely in how the CLI streams and renders tokens to the terminal.