Harnesses

Antigravity CLI

Google's second CLI, sharing ~/.gemini with Gemini CLI. Native audio and video attachments, conversations as Protocol Buffers, hooks in JSON.

getHarness: getHarness("antigravity")
binary: agy
invoke modes: 2 of 6 · official
model listing: no
mcp config: json · antigravity
agents file: ~/.gemini/config/AGENTS.md

Antigravity lives under ~/.gemini/ next to Gemini CLI but keeps its own subtree: config/ for the shared customization root with AGENTS.md, skills, plugins and hooks, antigravity-cli/ for the CLI's own settings, conversations, history and a SQLite summary index. Conversations are Protocol Buffers, which is why there is no session schema for it here yet.

It is the only harness with both audio and video verified: attachments go into model context natively, with documented audio formats and direct video pasting. Its binary is agy, and the headless mode is --print. No environment variable marks a session, so detection is by the .antigravitycli marker only. MCP servers use their own dialect in ~/.gemini/config/mcp_config.json.

Capabilities and invocation

mcp: yesvision: yesaudio: yesvideo: yestools: yesstreaming: yes

Binary agy, evidence official. Non-interactive print mode. Model selection appends --model {model}.

advisor

{}

rejected

advisor · json

{ structured: true }

rejected

read-only

{ readOnly: true }

rejected

read-only · json

{ readOnly: true, structured: true }

rejected

agent

{ tools: true }

--print {prompt}

agent · json

{ tools: true, structured: true }

--print --output-format json {prompt}

Paths

Templates as the registry stores them. ~, ${HOME} and %VAR% expand in resolve(); entries tagged with a platform are dropped on the others. Open in the explorer to see them expanded for a home directory of your choice.

config

~/.gemini/config/config.jsonuser · official · allShared Antigravity configuration and user settings.
~/.gemini/antigravity-cli/settings.jsonuser · official · allCLI-specific settings, including trusted workspaces.
~/.gemini/config/skills.jsonuser · official · allExplicit registrations of skill directories outside the default locations.
~/.gemini/config/plugins.jsonuser · official · allExplicit registrations of plugin directories outside the default locations.
.agents/skills.jsonproject · official · allWorkspace registrations of skill directories outside .agents/skills/.
.agents/plugins.jsonproject · official · allWorkspace registrations of plugin directories outside .agents/plugins/.

sessions

~/.gemini/antigravity-cli/conversations/data · official · allPersisted CLI conversations.
~/.gemini/antigravity-cli/history.jsonldata · official · allCLI prompt history.
~/.gemini/antigravity-cli/conversation_summaries.dbdata · official · allConversation summary index.

instructions

~/.gemini/config/AGENTS.mduser · official · allGlobal rules in the shared Antigravity customization root.
AGENTS.mdproject · official · allWorkspace instructions; GEMINI.md is also supported.
GEMINI.mdproject · official · allWorkspace instructions compatible with Gemini CLI.

skills