agy-p

Use this skill when the task is not “how do I use the Antigravity TUI manually?”, but rather:

• “How do I call agy from code?”
• “Can another agent/script use my Google-backed Antigravity subscription?”
• “How do I run Antigravity headlessly?”
• “How do I resume an agy conversation programmatically?”
• “Why is agy -p hanging / asking for permissions / printing weird extra output?”

This skill is about the CLI subprocess integration path.

Mental model

agy has two distinct modes:

1. Interactive TUI mode — plain agy
2. Headless one-shot print mode — agy -p / agy --print

For programmatic integrations, prefer print mode unless you truly need the live TUI.

The key idea: agy authenticates using the same user’s local Antigravity credentials, so a script can usually reuse the existing Google-backed login without needing a separate API key.

Fast answer

For a one-shot scripted call, start here:

bash
agy \
  --dangerously-skip-permissions \
  --print-timeout 10m \
  -p "Summarise the repo and suggest the next 3 actions"

Good defaults for integrations:

• set the working directory deliberately
• add --dangerously-skip-permissions if the task may use tools
• set --print-timeout explicitly
• optionally set --model
• capture stdout and stderr
• treat the command as a subprocess, not an API

Verified local facts

These were verified locally on this machine with agy 1.0.6:

• Binary path: <AGY_BIN>
• agy --help exposes: --print, --prompt, --dangerously-skip-permissions, --print-timeout, --model, --conversation, --continue, --sandbox, --add-dir, --log-file, --prompt-interactive
• agy --help also lists shell subcommands: changelog, help, install, models, plugin, plugins, update
• agy models works non-interactively and currently lists:
• Gemini 3.5 Flash (Medium)
• Gemini 3.5 Flash (High)
• Gemini 3.5 Flash (Low)
• Gemini 3.1 Pro (Low)
• Gemini 3.1 Pro (High)
• Claude Sonnet 4.6 (Thinking)
• Claude Opus 4.6 (Thinking)
• GPT-OSS 120B (Medium)
• A fresh print call like agy -p "Reply with exactly: AGY_OK" returned clean stdout
• Output redirection to a file worked locally on Linux in testing
• --conversation <id> and --continue both worked for follow-up turns
• Important integration caveat (local observation, not promised contract): in local testing, resumed print-mode calls emitted prior assistant replies on stdout before the newest reply. Do not assume resumed output is only the latest turn.

Core invocation patterns

1) Fresh one-shot call

bash
agy --dangerously-skip-permissions -p "Explain what this directory does"

2) Explicit timeout

bash
agy --dangerously-skip-permissions --print-timeout 15m -p "Run the tests, explain the failures, and suggest a fix"

3) Explicit model

bash
agy --dangerously-skip-permissions \
  --model "Gemini 3.5 Flash (Medium)" \
  -p "Summarise the architecture"

4) Resume a known conversation

bash
agy --dangerously-skip-permissions \
  --conversation <conversation-id> \
  -p "Continue from the previous context and propose the next step"

5) Continue the most recent conversation

bash
agy --dangerously-skip-permissions --continue -p "What should I do next?"

6) Hybrid start-then-interactive mode

bash
agy -i "Open the repo and inspect the auth flow"

Use -i only when you want to stay interactive after seeding the prompt.

Programmatic subprocess recipes

Bash

bash
#!/usr/bin/env bash
set -euo pipefail

export PATH="/path/to/agy/bin:$PATH"

PROMPT="Summarise the purpose of this repository in 5 bullets."
OUTPUT=$(agy --dangerously-skip-permissions --print-timeout 5m -p "$PROMPT")
printf '%s\n' "$OUTPUT"

Node.js

javascript
import { spawn } from "node:child_process";

function runAgy({ prompt, cwd, model, conversationId, useContinue = false, timeout = "10m" }) {
  return new Promise((resolve, reject) => {
    const args = ["--dangerously-skip-permissions", "--print-timeout", timeout];

    if (model) args.push("--model", model);
    if (conversationId) args.push("--conversation", conversationId);
    if (useContinue) args.push("--continue");

    args.push("-p", prompt);

    const proc = spawn("agy", args, {
      cwd,
      env: process.env,
      stdio: ["ignore", "pipe", "pipe"],
    });

    let stdout = "";
    let stderr = "";

    proc.stdout.on("data", (d) => { stdout += d.toString(); });
    proc.stderr.on("data", (d) => { stderr += d.toString(); });

    proc.on("error", reject);
    proc.on("close", (code) => {
      if (code === 0) {
        resolve({ stdout, stderr });
      } else {
        reject(new Error(`agy exited ${code}\nSTDERR:\n${stderr}\nSTDOUT:\n${stdout}`));
      }
    });
  });
}

Python

python
import subprocess


def run_agy(prompt, cwd, model=None, conversation_id=None, use_continue=False, timeout="10m"):
    cmd = [
        "agy",
        "--dangerously-skip-permissions",
        "--print-timeout",
        timeout,
    ]

    if model:
        cmd += ["--model", model]
    if conversation_id:
        cmd += ["--conversation", conversation_id]
    if use_continue:
        cmd += ["--continue"]

    cmd += ["-p", prompt]

    return subprocess.run(
        cmd,
        cwd=cwd,
        capture_output=True,
        text=True,
        check=True,
    )

Authentication and subscription reuse

For scripted usage, agy usually reuses the current user’s local login state.

Relevant files/locations:

• Global settings: ~/.gemini/settings.json
• Antigravity app data: ~/.gemini/antigravity-cli/
• Antigravity settings: ~/.gemini/antigravity-cli/settings.json
• Keybindings: ~/.gemini/antigravity-cli/keybindings.json
• OAuth credentials commonly present on the machine: ~/.gemini/oauth_creds.json
• Token file also observed locally: ~/.gemini/antigravity-cli/antigravity-oauth-token
• Logs: ~/.gemini/antigravity-cli/log/cli-*.log

Do not print or expose credential file contents in logs, user-facing traces, or telemetry.

Practical guidance:

• Run the subprocess as the same OS user who already authenticated in Antigravity.
• Do not invent an API-key flow if the goal is “reuse my CLI subscription/auth state”.
• If auth is missing, agy may attempt browser-based sign-in.
• On remote/SSH setups, official docs say it can print a login URL/code flow instead of opening a browser.

Workspace scoping matters

Antigravity scopes work to the launch directory and workspace context.

For integrations, always set cwd intentionally.

Why this matters:

• tool access and repo understanding depend on the launch directory
• recent conversation visibility is workspace-sensitive
• project identity may differ between directories
• official Antigravity docs surfaced during research indicate conversation history is scoped to the current working directory

If the integration needs more than one directory in scope, add extra roots with repeated --add-dir flags.

Example:

bash
agy --dangerously-skip-permissions \
  --add-dir /repo/backend \
  --add-dir /repo/shared \
  -p "Check the backend and shared package for duplicated types"

Conversation continuity

agy exposes two follow-up mechanisms:

• --conversation <id> — resume a specific conversation
• --continue / -c — continue the most recent conversation

What is a conversation ID?

Locally, Antigravity stores conversations under:

text
~/.gemini/antigravity-cli/conversations/

Observed local format: one SQLite DB per conversation, with filenames like:

text
24342cb9-f218-4788-b349-5acde3c5df33.db

That UUID is usable as the --conversation value.

Important caveat for custom integrations

In local testing on agy 1.0.6, resuming with --conversation or --continue caused stdout to include earlier assistant final replies before the newest one. Treat this as an observed behaviour, not a documented stable contract.

Example shape observed:

text
PREVIOUS_REPLY
PREVIOUS_REPLY_2
NEWEST_REPLY

So if you are building a multi-turn wrapper:

• do not assume resumed stdout is a single clean answer
• parse defensively
• consider taking the last non-empty block/line as the newest answer if your prompt format guarantees that shape
• better yet, ask the model to wrap the final answer in a delimiter you can parse reliably

Example prompt pattern:

text
Return your final answer only inside:
<AGY_FINAL>
...
</AGY_FINAL>

Then parse the last tagged block from stdout.

Discovering the new conversation ID

There is no verified JSON event stream documented for agy -p yet. In practice, an integration may need to:

1. snapshot ~/.gemini/antigravity-cli/conversations/ before the call
2. run a fresh agy -p ...
3. inspect the newest/newly-created *.db file afterward

Treat this as a pragmatic filesystem-based workaround, not a guaranteed formal API.

Permissions and safety

Why --dangerously-skip-permissions matters

Without it, headless runs can stall when the agent wants approval for:

• running commands
• editing files
• reading outside the default workspace
• other tool actions

For automation, this flag is often necessary.

But it is genuinely dangerous

It effectively auto-approves tool actions. Only use it when:

• the workspace is controlled
• the prompt is trusted
• the execution environment is appropriately isolated

Sandbox warning

The docs present --sandbox as a way to restrict terminal execution, but public issue tracker research found an open issue showing that combining:

bash
--sandbox --dangerously-skip-permissions

may undermine sandbox guarantees by auto-approving sandbox bypass prompts.

As of June 2026, treat this combination as not a strong security boundary unless you have independently verified the behaviour in your exact environment/version.

If you need real isolation, prefer external containment such as:

• a container
• a VM
• a locked-down dedicated workspace user
• filesystem/network restrictions outside Antigravity itself

Headless reliability notes

Public issue tracker research shows at least one open 1.0.6 bug report for agy -p hanging in some non-TTY headless environments, especially Windows / redirected subprocess scenarios.

Local Linux testing here did succeed for:

• plain agy -p
• redirected stdout to file
• resumed conversations via --conversation

So the right guidance is:

• test in the exact target environment
• do not assume Linux and Windows behave the same
• add watchdog timeouts at the parent-process level even if you also set --print-timeout

A robust wrapper should enforce both:

1. agy --print-timeout ...
2. an outer subprocess timeout from the parent language/runtime

Models

List models dynamically with:

bash
agy models

Do not hardcode the full model catalogue forever; it can change.

If the integration accepts a model name from a user, either:

• validate it against agy models, or
• provide a controlled allowlist sourced from a recent agy models check.

Logs and debugging

When scripted runs fail, inspect:

• stderr from the subprocess
• latest CLI logs in ~/.gemini/antigravity-cli/log/cli-*.log

Useful commands:

bash
agy --version
agy --help
agy models
agy plugin list
ls -lt ~/.gemini/antigravity-cli/log/cli-*.log | head

If you need per-run logfile isolation, pass --log-file /absolute/path/to/agy.log and archive that alongside stdout/stderr in your wrapper.

Useful things to read:

• ~/.gemini/settings.json
• ~/.gemini/antigravity-cli/settings.json
• ~/.gemini/antigravity-cli/keybindings.json
• the latest log file

Look for signs of:

• auth failure
• missing workspace access
• permission-review blocking
• model lookup failure
• sandbox behaviour surprises

Plugins and related commands

Programmatic wrappers may also need these shell-level commands:

• agy help
• agy plugin list
• agy plugins (alias surface)
• agy plugin install <target>
• agy plugin enable <name>
• agy plugin disable <name>
• agy plugin validate [path]
• agy update
• agy changelog
• agy install --help

This is still all shell CLI surface, not an HTTP API.

Recommended wrapper policy

If you are designing a reusable integration layer, prefer this policy:

1. Verify binary first with agy --version
2. Verify auth state indirectly with a trivial agy -p smoke test
3. Pin cwd explicitly
4. Set --print-timeout explicitly
5. Use --dangerously-skip-permissions only when needed
6. Capture stdout, stderr, exit code, duration
7. Inspect logs on failure
8. Treat resumed-conversation stdout as parseable-but-messy
9. Add an outer timeout in the parent process
10. Use external sandboxing if risk matters

Suggested smoke tests

Minimal

bash
agy -p "Reply with exactly: OK"

Tool-using

bash
agy --dangerously-skip-permissions -p "List the files in the current directory and summarise what kind of project this is"

Resume-specific

bash
agy --dangerously-skip-permissions -p "Reply with exactly: TURN1"
# detect newest conversation ID
agy --dangerously-skip-permissions --conversation <id> -p "Reply with exactly: TURN2"

Check whether the second stdout contains only TURN2 or accumulated prior replies too.

What to say when advising a user

When the user wants a custom integration, the default recommendation is:

• yes, agy has a programmatic path via -p / --print
• yes, it can usually reuse the same user’s local Antigravity/Google subscription login
• yes, another script/agent can spawn it as a subprocess
• but it is CLI automation, not a stable formal SDK/API
• you must handle permissions, timeouts, cwd/workspace scoping, and resume-output quirks carefully

If the user needs a more durable machine interface than subprocess wrapping, say so plainly.

Verification checklist

Before concluding an integration design is sound, verify all of these:

• agy --version works
• agy models works
• a fresh agy -p call works
• auth is already available for the target OS user
• the chosen cwd is correct
• any required extra roots are passed with --add-dir
• permission behaviour is understood
• timeout behaviour is tested
• resumed conversation parsing is tested
• --log-file behaviour is tested if you rely on custom run logs
• logs are readable on failure
• security boundaries do not rely solely on --sandbox + --dangerously-skip-permissions

If you need to inspect behaviour rather than guess, run the real command and look at the latest files in ~/.gemini/antigravity-cli/.