`sessionStart` hook is never fired

[ytx]

Describe the bug

Title: sessionStart hook is never fired

Description:

The sessionStart hook defined in .github/hooks/*.json is never executed, regardless of how the session is started (copilot fresh start, copilot --continue, or /resume).

Environment:

• Copilot CLI on macOS
• Hook config: .github/hooks/parallela.json

Expected behavior:
sessionStart fires when a new session begins or an existing session is resumed, as documented at https://docs.github.com/en/copilot/concepts/agents/coding-agent/about-hooks

Actual behavior:

• sessionEnd fires correctly on /exit
• userPromptSubmitted, preToolUse, agentStop all fire correctly
• sessionStart never fires — the hook script is never called

Verification:
Added logging to the hook script. Logs from all other hooks appear, but sessionStart produces no output at all, confirming the hook is not being invoked.

Workaround:
Currently detecting session start inside the userPromptSubmitted hook by checking for the absence of a session marker file.

Affected version

No response

Steps to reproduce the behavior

No response

Expected behavior

No response

Additional context

No response

[QuinnBast]

You must be doing something wrong. It works for me. I think your problem is that you think it is .github/hooks/*.json. The file HAS to be titled hooks.json as per the docs:

https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/use-hooks

The file accepts an array to configure multiple hooks if needed.

[ytx]

Thank you very much.
I confirmed it.