feat: auto-execute on slash command completion functions

[jackwotherspoon]

Summary

This is the third PR in the auto-execute saga. This PR allows slash commands with completion functions that take a single argument to auto-execute.

Think /mcp auth where you then are suggested which server to auth too:

This PR let's the command auto-execute once you hit Enter on the completion function suggestion.

Previous work:

1. Auto-execute simple built-in slash commands: feat: auto-execute simple slash commands on Enter #13985
2. Auto-execute argumentless MCP prompts: feat: add auto-execute on Enter behavior to argumentless MCP prompts #14510

Details

Allow built-in slash commands with completion functions to auto-execute when a completion suggestion is selected with Enter.

Before: /mcp auth → select server → autocompletes to /mcp auth my-server → requires Enter again to execute

After: /mcp auth → select server → executes immediately

Changes

• Exposed isArgumentCompletion and leafCommand from the slash completion hooks
• Modified Enter key handler to auto-execute argument completions when the command has autoExecute: true
• Set autoExecute: true on 6 single-arg completion commands: /mcp auth, /chat resume, /chat delete, /hooks enable, /hooks disable, /restore
• Multi-arg completion commands (/extensions enable, /extensions disable) keep autoExecute: false

Test Plan

• Added 3 new tests for argument completion auto-execute behavior
• Verified all existing tests pass

Related Issues

How to Validate

Hit enter on completion suggestion for arg for command like /chat resume or /mcp auth --> should auto-execute.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello @jackwotherspoon, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the user experience for slash commands in the CLI by enabling auto-execution for commands that require a single argument selected via a completion function. This change streamlines interaction by eliminating an extra step, making the command input process more efficient and intuitive. It builds upon previous work to enhance command auto-execution, focusing specifically on argument completions.

Highlights

• Auto-execution for single-argument completion commands: Slash commands with completion functions that take a single argument will now auto-execute upon selection of a completion suggestion, removing the need for a second 'Enter' press.
• Updated Enter key handler logic: The InputPrompt component's Enter key handler has been modified to check for isArgumentCompletion and leafCommand to correctly trigger auto-execution for argument completions.
• Enabled auto-execute for specific commands: The autoExecute: true property has been set for eight built-in slash commands: /mcp auth, /chat resume, /chat delete, /hooks enable, /hooks disable, /extensions update, /extensions restart, and /restore.
• New completion hook properties: The useCommandCompletion and useSlashCompletion hooks now expose isArgumentCompletion and leafCommand to provide more context about the current completion state.
• New test cases: Three new tests have been added to verify the correct behavior of argument completion auto-execution, ensuring functionality for both auto-executing and non-auto-executing scenarios.

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[gemini-code-assist]

Code Review

This pull request introduces a great enhancement by allowing slash commands with single-argument completion functions to auto-execute, improving user experience. The implementation is well-structured, with clear logic changes in InputPrompt.tsx and good test coverage for the new behavior. However, I've found a critical issue where two of the updated commands, /extensions update and /extensions restart, are incorrectly marked for auto-execution. These commands support multiple arguments, and auto-executing them after the first argument would break the ability to specify more than one extension.

[github-actions]

Size Change: +709 B (0%)

Total Size: 21.5 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	21.5 MB	+709 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

_{compressed-size-action}

[abhipatel12]

LGTM thanks!