feat: add Antigravity IDE module

registry/coder/modules/antigravity/README.md

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+---
+display_name: Antigravity IDE
+description: Add a one-click button to launch Antigravity IDE
+icon: ../../../../.icons/antigravity.svg
+verified: false
+tags: [ide, antigravity, ai]
+---
+
+# Antigravity IDE
+
+Add a button to open any workspace with a single click in [Antigravity IDE](https://antigravity.google).
+
+Uses the [Coder Remote VS Code Extension](https://github.com/coder/vscode-coder).
+
+```tf
+module "antigravity" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder/antigravity/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.example.id
+}
+```
+
+## Examples
+
+### Open in a specific directory
+
+```tf
+module "antigravity" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder/antigravity/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.example.id
+  folder   = "/home/coder/project"
+}
+```
+
+### Configure MCP servers for Antigravity
+
+Provide a JSON-encoded string via the `mcp` input. When set, the module writes the value to `~/.gemini/antigravity/mcp_config.json` using a `coder_script` on workspace start.
+
+The following example configures Antigravity to use the GitHub MCP server with authentication facilitated by the [`coder_external_auth`](https://coder.com/docs/admin/external-auth#configure-a-github-oauth-app) resource.
+
+```tf
+module "antigravity" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder/antigravity/coder"
+  version  = "1.0.0"
+  agent_id = coder_agent.example.id
+  folder   = "/home/coder/project"
+  mcp = jsonencode({
+    mcpServers = {
+      "github" : {
+        "url" : "https://api.githubcopilot.com/mcp/",
+        "headers" : {
+          "Authorization" : "Bearer ${data.coder_external_auth.github.access_token}",
+        },
+        "type" : "http"
+      }
+    }
+  })
+}
+
+data "coder_external_auth" "github" {
+  id = "github"
+}
+```

registry/coder/modules/antigravity/main.test.ts

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+import { describe, it, expect } from "bun:test";
+import {
+  runTerraformApply,
+  runTerraformInit,
+  testRequiredVariables,
+  runContainer,
+  execContainer,
+  removeContainer,
+  findResourceInstance,
+  readFileContainer,
+} from "~test";
+
+describe("antigravity", async () => {
+  await runTerraformInit(import.meta.dir);
+
+  testRequiredVariables(import.meta.dir, {
+    agent_id: "foo",
+  });
+
+  it("default output", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+    });
+    expect(state.outputs.antigravity_url.value).toBe(
+      "antigravity://coder.coder-remote/open?owner=default&workspace=default&url=https://mydeployment.coder.com&token=$SESSION_TOKEN",
+    );
+
+    const coder_app = state.resources.find(
+      (res) => res.type === "coder_app" && res.name === "antigravity",
+    );
+
+    expect(coder_app).not.toBeNull();
+    expect(coder_app?.instances.length).toBe(1);
+    expect(coder_app?.instances[0].attributes.order).toBeNull();
+  });
+
+  it("adds folder", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      folder: "/foo/bar",
+    });
+    expect(state.outputs.antigravity_url.value).toBe(
+      "antigravity://coder.coder-remote/open?owner=default&workspace=default&folder=/foo/bar&url=https://mydeployment.coder.com&token=$SESSION_TOKEN",
+    );
+  });
+
+  it("adds folder and open_recent", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      folder: "/foo/bar",
+      open_recent: "true",
+    });
+    expect(state.outputs.antigravity_url.value).toBe(
+      "antigravity://coder.coder-remote/open?owner=default&workspace=default&folder=/foo/bar&openRecent&url=https://mydeployment.coder.com&token=$SESSION_TOKEN",
+    );
+  });
+
+  it("adds folder but not open_recent", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      folder: "/foo/bar",
+      openRecent: "false",
+    });
+    expect(state.outputs.antigravity_url.value).toBe(
+      "antigravity://coder.coder-remote/open?owner=default&workspace=default&folder=/foo/bar&url=https://mydeployment.coder.com&token=$SESSION_TOKEN",
+    );
+  });
+
+  it("adds open_recent", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      open_recent: "true",
+    });
+    expect(state.outputs.antigravity_url.value).toBe(
+      "antigravity://coder.coder-remote/open?owner=default&workspace=default&openRecent&url=https://mydeployment.coder.com&token=$SESSION_TOKEN",
+    );
+  });
+
+  it("expect order to be set", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+      order: "22",
+    });
+
+    const coder_app = state.resources.find(
+      (res) => res.type === "coder_app" && res.name === "antigravity",
+    );
+
+    expect(coder_app).not.toBeNull();
+    expect(coder_app?.instances.length).toBe(1);
+    expect(coder_app?.instances[0].attributes.order).toBe(22);
+  });
+
+  it("writes ~/.gemini/antigravity/mcp_config.json when mcp provided", async () => {
+    const id = await runContainer("alpine");
+    try {
+      const mcp = JSON.stringify({
+        servers: { demo: { url: "http://localhost:1234" } },
+      });
+      const state = await runTerraformApply(import.meta.dir, {
+        agent_id: "foo",
+        mcp,
+      });
+      const script = findResourceInstance(
+        state,
+        "coder_script",
+        "antigravity_mcp",
+      ).script;
+      const resp = await execContainer(id, ["sh", "-c", script]);
+      if (resp.exitCode !== 0) {
+        console.log(resp.stdout);
+        console.log(resp.stderr);
+      }
+      expect(resp.exitCode).toBe(0);
+      const content = await readFileContainer(
+        id,
+        "/root/.gemini/antigravity/mcp_config.json",
+      );
+      expect(content).toBe(mcp);
+    } finally {
+      await removeContainer(id);
+    }
+  }, 10000);
+});

registry/coder/modules/antigravity/main.tf

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+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 2.5"
+    }
+  }
+}
+
+variable "agent_id" {
+  type        = string
+  description = "The ID of a Coder agent."
+}
+
+variable "folder" {
+  type        = string
+  description = "The folder to open in Antigravity IDE."
+  default     = ""
+}
+
+variable "open_recent" {
+  type        = bool
+  description = "Open the most recent workspace or folder. Falls back to the folder if there is no recent workspace or folder to open."
+  default     = false
+}
+
+variable "order" {
+  type        = number
+  description = "The order determines the position of app in the UI presentation. The lowest order is shown first and apps with equal order are sorted by name (ascending order)."
+  default     = null
+}
+
+variable "group" {
+  type        = string
+  description = "The name of a group that this app belongs to."
+  default     = null
+}
+
+variable "slug" {
+  type        = string
+  description = "The slug of the app."
+  default     = "antigravity"
+}
+
+variable "display_name" {
+  type        = string
+  description = "The display name of the app."
+  default     = "Antigravity IDE"
+}
+
+variable "mcp" {
+  type        = string
+  description = "JSON-encoded string to configure MCP servers for Antigravity. When set, writes ~/.gemini/antigravity/mcp_config.json."
+  default     = ""
+}
+
+data "coder_workspace" "me" {}
+
+data "coder_workspace_owner" "me" {}
+
+locals {
+  mcp_b64 = var.mcp != "" ? base64encode(var.mcp) : ""
+}
+
+resource "coder_app" "antigravity" {
+  agent_id     = var.agent_id
+  external     = true
+  icon         = "/icon/antigravity.svg"
+  slug         = var.slug
+  display_name = var.display_name
+  order        = var.order
+  group        = var.group
+  url = join("", [
+    "antigravity://coder.coder-remote/open",
+    "?owner=",
+    data.coder_workspace_owner.me.name,
+    "&workspace=",
+    data.coder_workspace.me.name,
+    var.folder != "" ? join("", ["&folder=", var.folder]) : "",
+    var.open_recent ? "&openRecent" : "",
+    "&url=",
+    data.coder_workspace.me.access_url,
+    "&token=$SESSION_TOKEN",
+  ])
+}
+
+resource "coder_script" "antigravity_mcp" {
+  count              = var.mcp != "" ? 1 : 0
+  agent_id           = var.agent_id
+  display_name       = "Antigravity MCP"
+  icon               = "/icon/antigravity.svg"
+  run_on_start       = true
+  start_blocks_login = false
+  script             = <<-EOT
+    #!/bin/sh
+    set -eu
+    mkdir -p "$HOME/.gemini/antigravity"
+    echo -n "${local.mcp_b64}" | base64 -d > "$HOME/.gemini/antigravity/mcp_config.json"
+    chmod 600 "$HOME/.gemini/antigravity/mcp_config.json"
+  EOT
+}
+
+output "antigravity_url" {
+  value       = coder_app.antigravity.url
+  description = "Antigravity IDE URL."
+}
+