---
name: clickthrough-http-control
description: Control a local computer through the Clickthrough HTTP server using screenshot grids, zoomed grids, and pointer/keyboard actions. Use when an agent must operate GUI apps by repeatedly capturing the screen, refining target coordinates, and executing precise interactions (click/right-click/double-click/scroll/type/hotkey) with verification.
---

# Clickthrough HTTP Control

Use a strict observe-decide-act-verify loop.

## Workflow

1. Call `GET /screen` with coarse grid (e.g., 12x12).
2. Identify likely cell/region for the target UI element.
3. If confidence is low, call `POST /zoom` centered on the candidate and use denser grid (e.g., 20x20).
4. Execute one minimal action via `POST /action`.
5. Re-capture with `GET /screen` and verify the expected state change.
6. Repeat until objective is complete.

## Precision rules

- Prefer grid targets first, then use `dx/dy` for subcell precision.
- Keep `dx/dy` in `[-1,1]`; start at `0,0` and only offset when needed.
- Use zoom before guessing offsets.

## Safety rules

- Respect `dry_run` and `allowed_region` restrictions from `/health`.
- Avoid destructive shortcuts unless explicitly requested.
- Send one action at a time unless deterministic; then use `/batch`.

## Reliability rules

- After every meaningful action, verify with a fresh screenshot.
- On mismatch, do not spam clicks: zoom, re-localize, and retry once.
- Prefer short, reversible actions over long macros.