# Analysis of server_sse.py Issues
Based on your description and the code in `server_sse.py`, here are the likely causes for the issues you are experiencing with Copilot tools in the SSE environment:
## 1. Stderr Noise / "Corrupted" Output
The function `filter_stderr` in `server_sse.py` is specifically designed to filter **Gemini CLI** noise (e.g., `[STARTUP]`, `Loading extension`).
GitHub Copilot CLI likely produces its own set of log messages, warnings, or status updates to `stderr`. Since `filter_stderr` does not match these Copilot-specific patterns, they are not filtered out.
The `process_gemini_output` function appends *any* remaining stderr content to the final output:
```python
if filtered_stderr:
if output:
output += f"\n\n[ERRORS]\n{filtered_stderr}"
```
This results in tools like `run_copilot_prompt` returning output that includes `[stderr] ...` followed by Copilot logs (like the file path to `index.js`), even if the command actually succeeded or the "error" was just a warning.
**Fix:** You need to update `filter_stderr` (or create a new `filter_copilot_stderr`) to ignore Copilot-specific noise patterns, or modify `process_gemini_output` to only append stderr if `result.returncode != 0`.
## 2. Minified JS Output (copilot_version)
The issue where `copilot_version` returns minified JS code is highly unusual for a CLI command like `--version`. However, combined with the fact that direct Python calls work, this suggests an **environment configuration issue** in the SSE process.
When `subprocess.run` executes the `copilot` executable (which is a Node.js script), it relies on the shebang `#!/usr/bin/env node`. This requires `node` to be in the system `PATH`.
In an SSE server context (especially if run via a service manager or a different shell environment), the `PATH` environment variable might **not include the NVM bin directory** where `node` resides.
If `node` is missing from `PATH`:
1. The kernel cannot execute the script via the shebang.
2. The shell (sh/bash) might attempt to execute it as a shell script.
3. Since it's a JS file, this execution fails.
4. Depending on the shell and configuration, it might output syntax errors or, in some rare misconfigurations, the content might be dumped (though this is less standard).
**More likely scenario:** The "Minified JS" is actually the **source code of the Copilot CLI** being printed to stdout/stderr because the Node process crashed or was invoked incorrectly (e.g. `node --print ...`).
**Fix:** Ensure the `PATH` environment variable in the SSE server process includes the directory containing `node`. You can do this by explicitly setting the path or activating the NVM environment in the Python script.
## Suggested Fixes
I have created a `server_sse_fixed.py` that includes:
1. **Generic Stderr Filtering**: Updates `process_gemini_output` to prioritize `stdout` and only show `stderr` if the return code indicates failure or if `stdout` is empty.
2. **Environment Check**: Adds a check to ensure `node` is in the `PATH` before running commands.
You should apply these patterns to your Copilot tools.
```
