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Antigravity (Google's `agy` CLI) installs the existing Superpowers plugin
directly:
agy plugin install https://github.com/obra/superpowers
agy imports the bundled skills and runs the plugin's SessionStart hook, so
using-superpowers bootstraps from the first message — verified on agy 1.0.3:
a fresh session given "Let's make a react todo list" auto-triggers the
brainstorming skill instead of writing code. agy discovers skills natively
and, having no Skill tool, loads them by reading SKILL.md with view_file.
No scaffold, installer, or generated context file is needed. This adds only:
- README.md: an Antigravity install section + Quickstart link
- skills/using-superpowers/SKILL.md: reference to the agy tool mapping
- skills/using-superpowers/references/antigravity-tools.md: action->tool
mapping for agy (view_file, write_to_file, invoke_subagent, manage_task,
and skill loading via view_file on SKILL.md)
- tests/antigravity/: structural test for the tool mapping, mirroring
tests/pi/
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Antigravity CLI (agy) Tool Mapping
Skills speak in actions ("dispatch a subagent", "create a todo", "read a file"). On the Antigravity CLI (agy) these resolve to the tools below.
| Action skills request | Antigravity CLI equivalent |
|---|---|
| Read a file | view_file |
| Create a new file | write_to_file |
| Edit a file | replace_file_content |
| Edit a file in several places at once | multi_replace_file_content |
| Run a shell command | run_command |
| Search file contents | grep_search |
| Find files by name / list a directory | list_dir (no dedicated glob tool — combine list_dir with grep_search) |
| Fetch a URL | read_url_content |
| Search the web | search_web |
| Pose a structured question to your human partner | ask_question |
Dispatch a subagent (Subagent (general-purpose): template) |
invoke_subagent with a built-in TypeName — self for full-capability work, research for read-only (see Subagent support) |
| Multiple parallel dispatches | Multiple entries in one invoke_subagent call's Subagents array |
| Task tracking ("create a todo", "mark complete") | a task artifact — write_to_file with IsArtifact: true and ArtifactType: "task" (see Task tracking). Not manage_task, which manages background processes. |
Invoking a skill — read its SKILL.md
Antigravity surfaces every installed skill's name + description to you at the
start of each session, but it has no Skill/activate_skill tool. To load a
skill, read its SKILL.md with view_file, setting IsSkillFile: true when
the skill applies — e.g. view_file on
.../plugins/superpowers/skills/<skill-name>/SKILL.md with IsSkillFile: true.
(IsSkillFile is agy's own signal that you're reading a file to execute its
instructions, not to edit or preview it — set it whenever you load a skill.)
This is the blessed skill-loading mechanism on this harness. The general rule
"never read skill files manually" means "don't bypass your platform's
skill-loading mechanism" — and on Antigravity, reading SKILL.md is that
mechanism. Reading it honors the rule rather than breaking it.
You already know which skills exist and what they're for: their names and
descriptions are in front of you at session start. When a description matches
what you're about to do, read that skill's SKILL.md before acting.
Subagent support
Antigravity dispatches subagents with invoke_subagent, passing each one a
TypeName in the Subagents array. Two TypeNames are built in — use them
directly, no define_subagent needed:
self— a full clone of you, with every tool you have (includingwrite_to_file/replace_file_content/run_command). The safe default for general-purpose work: implementing, fixing, anything that edits files or runs commands.research— read-only (file reading,grep_search, web/URL fetch; no write or command access). Use it when you specifically want a subagent that can't make changes — investigation and read-only review.
Call define_subagent only for a custom system prompt or capability mix: set
enable_write_tools: true to grant file edits and run_command,
enable_subagent_tools for nested dispatch, enable_mcp_tools for MCP. Then
invoke it by the name you gave it. (manage_subagents lists/kills running
subagents.)
Skills dispatch with Subagent (general-purpose): and either reference a
prompt-template file (e.g. superpowers:subagent-driven-development's
./implementer-prompt.md) or supply an inline prompt. On Antigravity:
| Skill dispatch form | Antigravity equivalent |
|---|---|
An implementer-style *-prompt.md template (writes code, runs tests) |
Fill the template, then invoke_subagent with TypeName: "self" and the filled prompt |
A read-only reviewer template (spec-reviewer, code-quality-reviewer, code-reviewer, requesting-code-review's ./code-reviewer.md) |
invoke_subagent with TypeName: "research" and the filled review template |
| Inline prompt (no template referenced) | invoke_subagent with TypeName: "self" (or "research" if the task only reads) and your inline prompt |
Prompt filling
Skills provide prompt templates with placeholders like {WHAT_WAS_IMPLEMENTED} or
[FULL TEXT of task]. Fill all placeholders before passing the complete prompt to
invoke_subagent. The prompt template itself contains the agent's role, review
criteria, and expected output format — the subagent will follow it.
Parallel dispatch
Put multiple entries in a single invoke_subagent call's Subagents array to run
independent subagent work in parallel. Keep dependent tasks sequential, but do not
serialize independent subagent tasks just to preserve a simpler history.
Task tracking
Antigravity has no todo / TodoWrite tool (manage_task manages background
processes — list/kill/status/send_input — it is not a checklist). When a
skill says to create a todo list or track tasks, maintain a task artifact: a
markdown checklist saved with write_to_file (IsArtifact: true,
ArtifactMetadata.ArtifactType: "task"), edited with replace_file_content /
multi_replace_file_content as you go.
At the start of any multi-step task, create the task artifact listing every step of
your plan. As you complete each step, edit the artifact to mark it done (- [x]).
If the plan changes, update the checklist. Keep it current — it is your source of
truth for what remains; once the conversation gets long, re-read it before starting
each step.