diff --git a/README.md b/README.md
index 3e64122..b641b56 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,27 @@ bash run_config/tw/opus-4p6_claude-code.sh
 
 To create your own config, copy an existing one and modify the agent, model, and parameters.
 
+### Gemini via the Antigravity CLI
+
+`run_config/*/gemini-3p6-flash_antigravity.sh` runs Gemini under Google's own
+Antigravity CLI (`agy`) instead of Claude Code or mini-swe-agent. Set
+`GEMINI_API_KEY` in `.env`; the allowed agent host is
+`generativelanguage.googleapis.com`.
+
+Two things to know before trusting the numbers:
+
+- Harbor's `antigravity-cli` agent needs
+  [harbor#2776](https://github.com/harbor-framework/harbor/pull/2776) and
+  [harbor#2687](https://github.com/harbor-framework/harbor/pull/2687), both open
+  but unmerged as of 2026-08-18. Without them, settings are written where `agy`
+  does not read them, `GEMINI_API_KEY` is ignored in favour of an interactive
+  login that hangs headless, no trajectory is collected, and — absent
+  `--add-dir` — file-producing tasks can write outside the workdir and score
+  zero. Test Writing is the track most exposed to that last one.
+- `agy` rejects model ids outside its client-side allowlist before any request
+  leaves the process, so `--model` failures are not quota or auth problems.
+  Which ids are accepted depends on your key's entitlement.
+
 ## Citation
 
 If you use SWE Atlas in your research, please cite our paper:
diff --git a/run_config/qa/gemini-3p6-flash_antigravity.sh b/run_config/qa/gemini-3p6-flash_antigravity.sh
new file mode 100755
index 0000000..48ddc98
--- /dev/null
+++ b/run_config/qa/gemini-3p6-flash_antigravity.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+# Gemini under Google's own Antigravity CLI (agy) rather than Claude Code or
+# mini-swe-agent. Requires GEMINI_API_KEY in .env.
+#
+# The model id is what agy's client-side allowlist accepts in Gemini Developer
+# API mode; newer ids depend on your key's entitlement and are rejected before
+# any request is sent, so change it only if you have verified yours.
+set -euo pipefail
+
+# Load credentials
+set -a
+source "$(dirname "$0")/../../.env"
+set +a
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+: "${GEMINI_API_KEY:?Set GEMINI_API_KEY in .env}"
+
+harbor run \
+  -p ./data/qa \
+  -a antigravity-cli \
+  -m "google/gemini-3.6-flash" \
+  -e modal \
+  --ek 'keepalive=["-c","sleep infinity"]' \
+  -k 1 \
+  -n 12 \
+  --ae "GEMINI_API_KEY=${GEMINI_API_KEY}" \
+  --allow-agent-host generativelanguage.googleapis.com \
+  --agent-include-logs '**' \
+  -o results/qa/ \
+  --job-name "gemini-3p6-flash_antigravity"
diff --git a/run_config/rf/gemini-3p6-flash_antigravity.sh b/run_config/rf/gemini-3p6-flash_antigravity.sh
new file mode 100755
index 0000000..c1826e2
--- /dev/null
+++ b/run_config/rf/gemini-3p6-flash_antigravity.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+# Gemini under Google's own Antigravity CLI (agy) rather than Claude Code or
+# mini-swe-agent. Requires GEMINI_API_KEY in .env.
+#
+# The model id is what agy's client-side allowlist accepts in Gemini Developer
+# API mode; newer ids depend on your key's entitlement and are rejected before
+# any request is sent, so change it only if you have verified yours.
+set -euo pipefail
+
+# Load credentials
+set -a
+source "$(dirname "$0")/../../.env"
+set +a
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+: "${GEMINI_API_KEY:?Set GEMINI_API_KEY in .env}"
+
+harbor run \
+  -p ./data/rf \
+  -a antigravity-cli \
+  -m "google/gemini-3.6-flash" \
+  -e modal \
+  --ek modal_vm_runtime=true \
+  -k 1 \
+  -n 12 \
+  --ae "GEMINI_API_KEY=${GEMINI_API_KEY}" \
+  --allow-agent-host generativelanguage.googleapis.com \
+  --agent-include-logs '**' \
+  -o results/rf/ \
+  --job-name "gemini-3p6-flash_antigravity"
diff --git a/run_config/tw/gemini-3p6-flash_antigravity.sh b/run_config/tw/gemini-3p6-flash_antigravity.sh
new file mode 100755
index 0000000..7112fd8
--- /dev/null
+++ b/run_config/tw/gemini-3p6-flash_antigravity.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+# Gemini under Google's own Antigravity CLI (agy) rather than Claude Code or
+# mini-swe-agent. Requires GEMINI_API_KEY in .env.
+#
+# The model id is what agy's client-side allowlist accepts in Gemini Developer
+# API mode; newer ids depend on your key's entitlement and are rejected before
+# any request is sent, so change it only if you have verified yours.
+#
+# TW runs with network access restricted to an allowlist, so the agent's own
+# API host has to be named explicitly -- see HARBOR_AGENT_ALLOWED_HOST in the
+# README. For agy that host is generativelanguage.googleapis.com.
+set -euo pipefail
+
+# Load credentials
+set -a
+source "$(dirname "$0")/../../.env"
+set +a
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+HARBOR_BIN="${HARBOR_BIN:-harbor}"
+: "${GEMINI_API_KEY:?Set GEMINI_API_KEY in .env}"
+
+"$HARBOR_BIN" run \
+  -p ./data/tw \
+  -a antigravity-cli \
+  -m "google/gemini-3.6-flash" \
+  -e modal \
+  --ek 'keepalive=["-c","sleep infinity"]' \
+  -k 1 \
+  -n 12 \
+  --ae "GEMINI_API_KEY=${GEMINI_API_KEY}" \
+  --allow-agent-host "${HARBOR_AGENT_ALLOWED_HOST:-generativelanguage.googleapis.com}" \
+  --agent-include-logs '**' \
+  -o results/tw/ \
+  --job-name "gemini-3p6-flash_antigravity"