diff --git a/.gitignore b/.gitignore
index 6b8d554b1..ec83ebfe7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,7 @@ extension/lib/xterm-addon-fit.js
 .env.*
 !.env.example
 supabase/.temp/
+.copilot/
 
 # Throughput analysis — local-only, regenerate via scripts/garry-output-comparison.ts
 docs/throughput-*.json
diff --git a/README.md b/README.md
index d89b8d998..30e323ac4 100644
--- a/README.md
+++ b/README.md
@@ -101,7 +101,7 @@ These are conversational skills. Your OpenClaw agent runs them directly via chat
 
 ### Other AI Agents
 
-gstack works on 10 AI coding agents, not just Claude. Setup auto-detects which
+gstack works on 11 AI coding agents, not just Claude. Setup auto-detects which
 agents you have installed:
 
 ```bash
@@ -120,6 +120,7 @@ Or target a specific agent with `./setup --host <name>`:
 | Slate | `--host slate` | `~/.slate/skills/gstack-*/` |
 | Kiro | `--host kiro` | `~/.kiro/skills/gstack-*/` |
 | Hermes | `--host hermes` | `~/.hermes/skills/gstack-*/` |
+| GitHub Copilot | `--host copilot` | `~/.copilot/skills/gstack-*/` |
 | GBrain (mod) | `--host gbrain` | `~/.gbrain/skills/gstack-*/` |
 
 **Want to add support for another agent?** See [docs/ADDING_A_HOST.md](docs/ADDING_A_HOST.md).
diff --git a/hosts/index.ts b/hosts/index.ts
index cc1c213b5..0cb763fb2 100644
--- a/hosts/index.ts
+++ b/hosts/index.ts
@@ -16,9 +16,10 @@ import cursor from './cursor';
 import openclaw from './openclaw';
 import hermes from './hermes';
 import gbrain from './gbrain';
+import copilot from './copilot';
 
 /** All registered host configs. Add new hosts here. */
-export const ALL_HOST_CONFIGS: HostConfig[] = [claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain];
+export const ALL_HOST_CONFIGS: HostConfig[] = [claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain, copilot];
 
 /** Map from host name to config. */
 export const HOST_CONFIG_MAP: Record<string, HostConfig> = Object.fromEntries(
@@ -65,4 +66,4 @@ export function getExternalHosts(): HostConfig[] {
 }
 
 // Re-export individual configs for direct import
-export { claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain };
+export { claude, codex, factory, kiro, opencode, slate, cursor, openclaw, hermes, gbrain, copilot };
diff --git a/test/host-config.test.ts b/test/host-config.test.ts
index 577057033..0a25c0fde 100644
--- a/test/host-config.test.ts
+++ b/test/host-config.test.ts
@@ -31,7 +31,7 @@ const ROOT = path.resolve(import.meta.dir, '..');
 
 describe('hosts/index.ts', () => {
   test('ALL_HOST_CONFIGS has 10 hosts', () => {
-    expect(ALL_HOST_CONFIGS.length).toBe(10);
+    expect(ALL_HOST_CONFIGS.length).toBe(11);
   });
 
   test('ALL_HOST_NAMES matches config names', () => {