CLI cannot execute hooks shipped with plugins

Describe the bug

As of 1.0.57, I am unable to issue any prompts to GHCP CLI w/o them failing on preToolUse hook exceptions.

Logs show myriad failures like:

2026-06-03T18:51:15.906Z [DEBUG] [hook stderr] The argument '.github/hooks/governance-audit/audit-session-start.ps1' is not recognized as the name of a script file. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
2026-06-03T18:51:15.907Z [DEBUG] [hook stdout] 
Usage: pwsh[.exe] [-Login] [[-File] <filePath> [args]]
                  [-Command { - | <script-block> [-args <arg-array>]
                                | <string> [<CommandParameters>] } ]
                  [-CommandWithArgs <string> [<CommandParameters>]
                  [-ConfigurationName <string>] [-ConfigurationFile <filePath>]
                  [-CustomPipeName <string>] [-EncodedCommand <Base64EncodedCommand>]
                  [-ExecutionPolicy <ExecutionPolicy>] [-InputFormat {Text | XML}]
                  [-Interactive] [-MTA] [-NoExit] [-NoLogo] [-NonInteractive] [-NoProfile]
                  [-NoProfileLoadTime] [-OutputFormat {Text | XML}]
                  [-SettingsFile <filePath>] [-SSHServerMode] [-STA]
                  [-Version] [-WindowStyle <style>]
                  [-WorkingDirectory <directoryPath>]

       pwsh[.exe] -h | -Help | -? | /?

PowerShell Online Help https://aka.ms/powershell-docs

All parameters are case-insensitive.
2026-06-03T18:51:16.068Z [ERROR] Hook execution failed: HookExitCodeError: Hook command failed with code 1

across numerous hook files.

Affected version

1.0.57+

Steps to reproduce the behavior

Install one or more plugins (which ship hooks as part of their functionality) into the CLI.
Send a prompt to the CLI with the plugin active & loaded

Expected behavior

Prompt is processed

Additional context

I have my Copilot Home and cache dirs set to my dev drive (d:\.copilot and d:\.copilot\cache, respectively)

The root of this issue appears to be in the way plugins ship hooks and hooks get invoked by the CLI.

E.g. consider a plugin marketplace repo like:

.github
  plugin
    marketplace.json
plugins
  example-plugin
    .github
      hooks
        example-hook
          my-script.ps1
      plugin
        hooks.json

where the hooks.json would have a definition to point to something in the example-hook like:

{
  "version": 1,
  "hooks": {
    "sessionStart": [
      {
        "type": "command",
        "powershell": "pwsh -NoProfile -ExecutionPolicy Bypass -File .github/hooks/example-hook/my-script.ps1",
        "cwd": ".",
        "env": {
          "ENV_VAR": "sample_value"
        },
        "timeoutSec": 10
      }
    ]
  }
}

on session start, with this plugin active, the CLI:

reads the hooks.json
attempts to invoke the hook based on the path in the plugin which, of course, fails because the plugin - once installed into GHCP CLI - lives at $COPILOT_HOME/cache/marketplaces/<repo-slug>/plugins/example-plugin so it won't find the hook at simply .github/hooks/... resulting in the cited "not found" exception.

I tried removing the cwd property to no avail.

Setting cwd to ${PLUGIN_ROOT} (an as-yet-undocumented env var injected at runtime) appears to solve the problem.

Suggested fix(es):

Document PLUGIN_ROOT
Make it the default if cwd is not specified in the JSON (I tried removing it altogether and execution still failed)

Thanks for the report! This is the same issue as #2540, so I'm closing this one as a duplicate. Please follow that issue for updates and add any extra details there.

_{Triaged as part of a Copilot SDK backlog review, with help from GitHub Copilot.}

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CLI cannot execute hooks shipped with plugins #3659

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CLI cannot execute hooks shipped with plugins #3659

Description

Describe the bug

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Expected behavior

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brandonh-msft commented on Jun 3, 2026

brandonh-msft commented on Jun 3, 2026

brandonh-msft commented on Jun 4, 2026

patniko commented on Oct 26, 2026

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