jackwener/OpenCLI · error · Error

Could not find antigravity.agentSidePanelInputBox

Error message

Could not find antigravity.agentSidePanelInputBox

What it means

In serve.js sendMessage's bounding-box computation, thrown when the #antigravity.agentSidePanelInputBox element is absent from the page DOM. The code needs the container to locate the Lexical editor's center coordinates for a physical mouse click.

Source

Thrown at clis/antigravity/serve.js:253

        // Fallback: use JS-based approach
        await page.evaluate(`
      (() => {
        const container = document.getElementById('antigravity.agentSidePanelInputBox');
        const editor = container?.querySelector('[data-lexical-editor="true"]');
        if (!editor) throw new Error('Could not find input box');
        editor.focus();
        document.execCommand('insertText', false, ${JSON.stringify(message)});
      })()
    `);
        await sleep(500);
        await page.pressKey('Enter');
        return;
    }
    // Get the bounding box of the Lexical editor for a physical mouse click
    const rect = await page.evaluate(`
    (() => {
      const container = document.getElementById('antigravity.agentSidePanelInputBox');
      if (!container) throw new Error('Could not find antigravity.agentSidePanelInputBox');
      const editor = container.querySelector('[data-lexical-editor="true"]');
      if (!editor) throw new Error('Could not find Antigravity input box');
      const r = editor.getBoundingClientRect();
      return JSON.stringify({ x: r.left + r.width / 2, y: r.top + r.height / 2 });
    })()
  `);
    const { x, y } = JSON.parse(String(rect));
    // Physical mouse click to give the element real browser focus
    await bridge.send('Input.dispatchMouseEvent', { type: 'mousePressed', x, y, button: 'left', clickCount: 1 });
    await sleep(50);
    await bridge.send('Input.dispatchMouseEvent', { type: 'mouseReleased', x, y, button: 'left', clickCount: 1 });
    await sleep(200);
    // Inject text at the CDP level (no deprecated execCommand)
    await bridge.send('Input.insertText', { text: message });
    await sleep(300);
    // Send Enter via native CDP key event
    await bridge.send('Input.dispatchKeyEvent', { type: 'keyDown', key: 'Enter', code: 'Enter', windowsVirtualKeyCode: 13, nativeVirtualKeyCode: 13 });
    await sleep(50);

View on GitHub (pinned to 49907e53dc)

Solutions

1. Open the Antigravity agent side panel before sending requests
2. Verify the CDP page handle points at the correct Antigravity window/target (list targets and pick the right one)
3. Wait for the input container to exist before computing the rect (waitForSelector)
4. Confirm the element id after any Antigravity update

Example fix

// before
const container = document.getElementById('antigravity.agentSidePanelInputBox');
if (!container) throw new Error('Could not find antigravity.agentSidePanelInputBox');
// after
await page.waitForSelector('#antigravity.agentSidePanelInputBox', { timeout: 10000 });
const container = document.getElementById('antigravity.agentSidePanelInputBox');

const containerExists = await page.evaluate(() => !!document.getElementById('antigravity.agentSidePanelInputBox'));
if (!containerExists) throw new Error('Open the Antigravity side panel first');

function hasInputContainer(doc) {
  return doc.getElementById('antigravity.agentSidePanelInputBox') instanceof Element;
}

try {
  await sendMessage(message);
} catch (err) {
  if (err.message.includes('Could not find antigravity.agentSidePanelInputBox')) {
    await openSidePanel();
    await sendMessage(message);
  } else throw err;
}

When it happens

Trigger: page.evaluate runs the rect-extraction IIFE and document.getElementById('antigravity.agentSidePanelInputBox') returns null.

Common situations: Antigravity side panel never opened or was closed between requests; wrong window/tab focused (CDP page handle points at a different target); Antigravity UI update renamed the input container id; connecting before the IDE fully loaded its workbench UI.

Related errors

• Could not find Antigravity input box
• Could not find input box
• Could not find Antigravity input box
• Timeout waiting for Antigravity reply after ${timeout / 1000
• LinkedIn connect blocked: ${opened?.reason || 'connect_contr

AI-assisted analysis of jackwener/OpenCLI@49907e53dc (2026-08-29). Data as JSON: /api/errors/2b8170d13f125573. Report an issue: GitHub.