Add Copilot CLI to agent detection

We have data from direct testing in Copilot CLI confirming it sets
COPILOT_CLI=1 in its environment. Add it to the canonical agent list.

Co-authored-by: Isaac

Author: simonfaltum

NEXT_CHANGELOG.md

@@ -3,7 +3,7 @@
 ## Release v0.101.0
 
 ### New Features and Improvements
-* Added automatic detection of AI coding agents (Claude Code, Cursor, Cline, Codex, Gemini CLI, OpenCode, Antigravity) in the user-agent string. The SDK now appends `agent/<name>` to HTTP request headers when running inside a known AI agent environment.
+* Added automatic detection of AI coding agents (Antigravity, Claude Code, Cline, Codex, Copilot CLI, Cursor, Gemini CLI, OpenCode) in the user-agent string. The SDK now appends `agent/<name>` to HTTP request headers when running inside a known AI agent environment.
 
 ### Bug Fixes
 

databricks-sdk-java/src/main/java/com/databricks/sdk/core/UserAgent.java

@@ -256,6 +256,7 @@ private static List<AgentDef> listKnownAgents() {
         new AgentDef("CLAUDECODE", "claude-code"), // https://github.com/anthropics/claude-code
         new AgentDef("CLINE_ACTIVE", "cline"), // https://github.com/cline/cline (v3.24.0+)
         new AgentDef("CODEX_CI", "codex"), // https://github.com/openai/codex
+        new AgentDef("COPILOT_CLI", "copilot-cli"), // https://github.com/features/copilot
         new AgentDef("CURSOR_AGENT", "cursor"), // Closed source
         new AgentDef("GEMINI_CLI", "gemini-cli"), // https://google-gemini.github.io/gemini-cli
         new AgentDef("OPENCODE", "opencode")); // https://github.com/opencode-ai/opencode

databricks-sdk-java/src/test/java/com/databricks/sdk/core/UserAgentTest.java

@@ -163,6 +163,17 @@ public void testAgentProviderCodex() {
     Assertions.assertTrue(UserAgent.asString().contains("agent/codex"));
   }
 
+  @Test
+  public void testAgentProviderCopilotCli() {
+    setupAgentEnv(
+        new HashMap<String, String>() {
+          {
+            put("COPILOT_CLI", "1");
+          }
+        });
+    Assertions.assertTrue(UserAgent.asString().contains("agent/copilot-cli"));
+  }
+
   @Test
   public void testAgentProviderCursor() {
     setupAgentEnv(