Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/uipath/coder_eval/antigravitygit clone --depth 1 https://github.com/UiPath/coder_evalWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00040 | $0.02459 |
| Opus 5 | $0.00020 | $0.01229 |
| Sonnet 5 | $0.00008 | $0.00492 |
| Haiku 4.5 | $0.00004 | $0.00246 |
Grade A, and why
ANTIGRAVITY scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 221 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Running Google Antigravity (Gemini) in Coder Eval
Overview
Coder Eval can run Google's Antigravity agent — powered by Gemini — as the
agent under evaluation. Set agent.type: antigravity in a task and the rest of the
framework (sandbox, scoring, telemetry, reports) works unchanged.
Under the hood AntigravityAgent drives the Antigravity SDK's local harness
(the localharness binary bundled in the wheel) rather than the branded agy CLI
or the remote Interactions API. The local harness is the only surface that can (a)
authenticate headlessly with an API key and (b) make edits land in the sandbox
working directory — both required for an unattended eval.
Setup
1. Install the Antigravity SDK
pip install 'coder-eval[antigravity]'
This pulls in google-antigravity (pinned to 0.1.7), whose wheel bundles the
platform localharness binary. As with the other agents the SDK is imported lazily
— a base install without the extra still runs end-to-end; Antigravity tasks fail at
dispatch with a clear hint to install the extra.
2. Authentication
Antigravity authenticates against the Gemini Developer API with a single credential:
GEMINI_API_KEY=<your-gemini-api-key>
Set it in .env (or the environment). That is the only credential Antigravity
reads — there is no base-URL, project, or region override for this agent
(unlike Codex's CODEX_BASE_URL / Azure routing). If GEMINI_API_KEY is unset the
SDK raises a clear error on first use.
The
--backendflag (direct/bedrock) governs Claude routing only; it has no effect on the Antigravity agent.
Usage
Command line
coder-eval run tasks/agents/antigravity_hello_world.yaml --type antigravity
Or override the agent type for every task in an experiment:
coder-eval run experiments/model-comparison.yaml --type antigravity
Task definition (YAML)
agent:
type: antigravity
model: gemini-3.1-pro-preview # optional; see "Model selection" below
thinking_level: medium # minimal | low | medium | high (default: medium)
plugins:
- type: local
path: "$SKILLS_PLUGIN_PATH" # a directory of skills (SKILL.md), env-expanded
run_limits:
max_turns: 5
task_timeout: 360
turn_timeout: 300
success_criteria:
- type: file_exists
path: "hello.py"
description: "hello.py must be created"
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 221 lines · 40 tokens per session scan A 0ac5e36cbda8
ANTIGRAVITY is an agent published in the GitHub repository UiPath/coder_eval (119 stars, last pushed 3d ago), licensed Apache-2.0. It adds 40 tokens to every session and 2,459 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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