Fetching recursive tree could be inefficient for large repositories. Line 266 fetches the entire repository tree recursively (recursive: true), which can be very large for repositories with many files and deeply nested directories. This could cause performance issues or API rate limiting. Consider:

1. Fetching only the specific directory level needed based on the path prefix
2. Adding pagination or limiting the tree depth
3. Implementing client-side caching if this is called frequently

Debug print statements should be removed from production code. These statements at lines 79, 82, and 90 are logging debugging information to stdout. Consider using the project's logging utilities (pkg/log) with proper log levels if this information needs to be captured.

API call error is silently ignored. The error fromListBranches should be checked and handled. If the call fails, it could result in returning an empty list without informing the user of the failure. Consider handling the error similar to other completion functions or at minimum checking if branches is nil before iterating.

API call error is silently ignored. The error fromListTags should be checked and handled. If the call fails, it could result in returning an empty list without informing the user of the failure. Consider handling the error similar to how it's done incompletePRNumber or at minimum checking if tags is nil before iterating.

Generic error message loses context. The error fromclient.Search.Repositories should be wrapped or propagated to provide more specific failure information to the caller. Consider returning the original error withfmt.Errorf("failed to get repositories: %w", err) instead of creating a new generic error.

Tests mutate global variableRepositoryResourceArgumentResolvers. Lines 250-258, 290-296, and 333-337 directly modify the globalRepositoryResourceArgumentResolvers map, which can cause test failures when tests run in parallel or affect other tests. Consider either:

1. MakingRepositoryResourceArgumentResolvers non-exported and providing a way to inject custom resolvers for testing
2. Creating a copy of the map before modification and restoring after each test
3. Using t.Parallel() carefully or avoiding parallel execution for these tests

HasMore field is always false. Line 68 setsHasMore: false even when results are truncated to 100 items (line 60-62). If more than 100 results exist, HasMore should be set to true to indicate that additional results are available.

API call error is silently ignored. The error fromListCommits should be checked and handled. If the call fails, it could result in returning an empty list without informing the user of the failure. Consider handling the error similar to how it's done incompletePRNumber or at minimum checking if commits is nil before iterating.

[nitpick] Only returns open pull requests. The query on line 221 filters foris:open is:pr, which means closed PRs won't be included in completions. Consider whether this is the intended behavior or if closed/merged PRs should also be available for completion. If this is intentional, consider adding a comment explaining the rationale.

Search query may not work correctly for non-organization owners. Line 133 usesorg:%s in the search query, which will fail if the owner is a user rather than an organization. Consider usinguser:%s OR org:%s or checking the owner type first.