browser action must be start, status, navigate, click…

Error message

browser action must be start, status, navigate, click, type, screenshot or stop (got ${JSON.stringify(args.action)})

What it means

resolveTool's browser case default: the action string matched no supported browser action, so the call is rejected with the accepted action list (start, status, navigate, click, type, screenshot, stop) in the message.

Solutions

Use one of the supported browser actions: start, status, navigate, click, type, screenshot, stop.
Check the action string for typos; the received value is echoed in the error.

Defensive patterns

Strategy: validation

When it happens

Trigger: Thrown at crates/tui/plugins/computer-use/src/tools.mjs:855 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Hmbown/CodeWhale@73e0f67d83 (2026-09-22). Data as JSON: /api/errors/68f211f50413a71c. Report an issue: GitHub.

Appendix: source

Thrown at crates/tui/plugins/computer-use/src/tools.mjs:855

        case "navigate":
          if (typeof rest.url !== "string" || !rest.url.trim()) throw bad('browser action "navigate" requires url');
          return { name: "browser_navigate", args: rest };
        case "click": {
          const hasSelector = typeof rest.selector === "string" && rest.selector.trim();
          const hasPoint = rest.point != null && Number.isFinite(rest.point?.x) && Number.isFinite(rest.point?.y);
          if (hasSelector && hasPoint) throw bad('browser action "click" takes selector or point, not both — pick one target');
          if (!hasSelector && !hasPoint) throw bad('browser action "click" needs selector (CSS) or point {x,y}');
          if (!hasSelector) delete rest.selector;
          if (!hasPoint) delete rest.point;
          return { name: "browser_click", args: rest };
        }
        case "type":
          if (typeof rest.text !== "string" || !rest.text.length) throw bad('browser action "type" requires text');
          return { name: "browser_type", args: rest };
        case "screenshot": return { name: "browser_screenshot", args: rest };
        case "stop": return { name: "browser_stop", args: rest };
        default:
          throw bad(`browser action must be start, status, navigate, click, type, screenshot or stop (got ${JSON.stringify(args.action)})`);
      }
    }
    case "trajectory": {
      const rest = { ...args };
      delete rest.action;
      switch (args.action) {
        case "start": return { name: "trajectory_start", args: rest };
        case "stop": return { name: "trajectory_stop", args: rest };
        case "status": return { name: "trajectory_status", args: rest };
        case "replay": return { name: "trajectory_replay", args: rest };
        default:
          throw bad(`trajectory action must be start, stop, status or replay (got ${JSON.stringify(args.action)})`);
      }
    }
    default:
      return { name, args };
  }
}

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