diff --git a/README.md b/README.md
index 658c2cfd..1e4716cc 100644
--- a/README.md
+++ b/README.md
@@ -333,6 +333,7 @@ Built-ins:
 | `kiro`     | native (`kiro-cli acp`)                                                | [Kiro CLI](https://kiro.dev)                                                                                    |
 | `opencode` | `npx -y opencode-ai acp`                                               | [OpenCode](https://opencode.ai)                                                                                 |
 | `qwen`     | native (`qwen --acp`)                                                  | [Qwen Code](https://github.com/QwenLM/qwen-code)                                                                |
+| `trae`     | native (`traecli acp serve`)                                           | [Trae CLI](https://docs.trae.cn/cli)                                                                            |
 
 `factory-droid` and `factorydroid` also resolve to the built-in `droid` adapter.
 
diff --git a/agents/README.md b/agents/README.md
index 2235c2fd..2059d5c1 100644
--- a/agents/README.md
+++ b/agents/README.md
@@ -16,6 +16,7 @@ Built-in agents:
 - `kiro -> kiro-cli acp`
 - `opencode -> npx -y opencode-ai acp`
 - `qwen -> qwen --acp`
+- `trae -> traecli acp serve`
 
 Harness-specific docs in this directory:
 
@@ -30,3 +31,4 @@ Harness-specific docs in this directory:
 - [Kiro](Kiro.md): built-in `kiro -> kiro-cli acp`
 - [OpenCode](OpenCode.md): built-in `opencode -> npx -y opencode-ai acp`
 - [Qwen](Qwen.md): built-in `qwen -> qwen --acp`
+- [Trae](Trae.md): built-in `trae -> traecli acp serve`
diff --git a/agents/Trae.md b/agents/Trae.md
new file mode 100644
index 00000000..ebb74394
--- /dev/null
+++ b/agents/Trae.md
@@ -0,0 +1,5 @@
+# Trae
+
+- Built-in name: `trae`
+- Default command: `traecli acp serve`
+- Upstream: https://docs.trae.cn/cli
diff --git a/skills/acpx/SKILL.md b/skills/acpx/SKILL.md
index 5ab7f435..52fff851 100644
--- a/skills/acpx/SKILL.md
+++ b/skills/acpx/SKILL.md
@@ -79,11 +79,13 @@ Friendly agent names resolve to commands:
 - `cursor` -> `cursor-agent acp`
 - `copilot` -> `copilot --acp --stdio`
 - `droid` -> `droid exec --output-format acp` (`factory-droid` and `factorydroid` also resolve to `droid`)
+- `iflow` -> `iflow --experimental-acp`
+- `kilocode` -> `npx -y @kilocode/cli acp`
 - `kimi` -> `kimi acp`
-- `opencode` -> `npx -y opencode-ai acp`
 - `kiro` -> `kiro-cli acp`
-- `kilocode` -> `npx -y @kilocode/cli acp`
+- `opencode` -> `npx -y opencode-ai acp`
 - `qwen` -> `qwen --acp`
+- `trae` -> `traecli acp serve`
 
 Rules:
 
diff --git a/src/agent-registry.ts b/src/agent-registry.ts
index 0ec23a0e..cbb191ab 100644
--- a/src/agent-registry.ts
+++ b/src/agent-registry.ts
@@ -19,6 +19,7 @@ export const AGENT_REGISTRY: Record<string, string> = {
   kiro: "kiro-cli acp",
   opencode: "npx -y opencode-ai acp",
   qwen: "qwen --acp",
+  trae: "traecli acp serve",
 };
 
 const AGENT_ALIASES: Record<string, string> = {
diff --git a/test/agent-registry.test.ts b/test/agent-registry.test.ts
index ad021b50..0e274470 100644
--- a/test/agent-registry.test.ts
+++ b/test/agent-registry.test.ts
@@ -32,6 +32,11 @@ test("resolveAgentCommand prefers explicit alias overrides over built-in alias m
   );
 });
 
+test("trae built-in uses the standard traecli executable", () => {
+  assert.equal(AGENT_REGISTRY.trae, "traecli acp serve");
+  assert.equal(resolveAgentCommand("trae"), "traecli acp serve");
+});
+
 test("listBuiltInAgents preserves the required example prefix and alphabetical tail", () => {
   const agents = listBuiltInAgents();
   assert.deepEqual(agents, Object.keys(AGENT_REGISTRY));
@@ -52,6 +57,7 @@ test("listBuiltInAgents preserves the required example prefix and alphabetical t
     "kiro",
     "opencode",
     "qwen",
+    "trae",
   ]);
 });