Agent of the Day – May 28, 2026

May 28, 2026

Every codebase accumulates sediment. A helper function that made sense six months ago. A wrapper that lost its reason to exist after a refactor. Nobody deletes it on purpose — it just lingers. In Go, that lingering costs you: extra surface area to maintain, test coverage for code that does nothing new, and cognitive overhead for every engineer who reads the file.

The Dead Code Removal Agent is a scheduled GitHub Actions workflow that runs daily on the gh-aw repository. Its job is simple: find unused code, verify nothing breaks, and open a pull request. No human intervention required until review time.

Agent of the Day

Run #100 — A Quiet Milestone

On May 27, 2026, the agent completed run #100. Not a fanfare moment — just another daily run doing exactly what it was built to do. It finished in 11.4 minutes across 5 turns, consumed 14.6M effective tokens, and used 12 GitHub Actions minutes.

The target this time was NewValidationErrorWithLocation in pkg/workflow/workflow_errors.go. The function was a constructor wrapper around WorkflowValidationError — originally a convenience, but over time it became redundant as callers could initialize the struct directly. The agent identified it, confirmed it had no remaining callers, and started working.

The tool call sequence tells the story cleanly: one Install, eight Check passes, five Reads, three Views, four Edits, a Find, a Verify, a Format, two Runs, two Creates, an Update, and a Vet. That’s methodical, not mechanical. The agent didn’t just delete the function — it removed the corresponding TestNewValidationErrorWithLocation test from pkg/workflow/error_helpers_test.go and updated compiler_error_formatting_test.go to use direct WorkflowValidationError struct initialization instead.

Verification was thorough. Before touching the PR, the agent ran go build ./..., go vet ./..., go vet -tags=integration ./..., and make fmt. Everything passed. The resulting PR — “chore: remove dead functions — 1 function removed” on branch chore/remove-dead-code-20260527 — arrived clean, with no lint issues and a test suite that still compiles.

What Five Runs Look Like

Zoom out a week and the picture gets more interesting. Across five runs in the last seven days, the agent logged:

35.5 minutes total duration
38.9M effective tokens
38 GitHub Actions minutes
21 turns across all five runs
5 out of 5 high-confidence episodes

Run classification across that window: two normal runs, one risky, one failure, one in-progress. The failure and the risky classification matter as much as the successes. The agent doesn’t always find something safe to remove, and when it can’t complete cleanly, it doesn’t force a PR. That restraint is a feature, not a gap.

Why Automation Fits This Problem

Dead code removal is well-suited to an agent for a specific reason: the feedback loop is entirely mechanical. Does it build? Does go vet pass? Does the test suite still run? Those questions have definitive answers. The agent never has to speculate about intent — it just has to be rigorous about verification, which it is.

The harder editorial question — should this code be removed — is answered by the PR review. The agent does the investigation and the grunt work. Engineers do the judgment call. That division feels right.

There’s also something useful about the daily cadence. A function doesn’t become dead overnight. But catching it the morning after the last caller disappears, rather than six months later during a refactor, is the difference between a one-line deletion and an archaeology project.

Get Involved

If you’re curious about how the Dead Code Removal Agent is built, or if you want to run something similar against your own Go codebase, the workflow lives at github/gh-aw. The patterns here — schedule-triggered agents, structured verification steps, PR-as-output — are composable. Start there.

Run #100 was just another Tuesday. That’s the point.