copilot: discover and switch between all authorized models

README.md

@@ -68,17 +68,24 @@ model for one launch. OpenCode's `provider/model` form is also accepted.
 Unknown Databricks models produce an error; this option does not add models
 to discovery or change ug's saved default.
 
-`ug copilot` uses the Anthropic Messages API for Claude model IDs, the Responses
-API for GPT-5 and newer model IDs, and Chat Completions for other models. The
-model selected at launch (including `--model`) determines the API. An inherited `COPILOT_PROVIDER_WIRE_MODEL` takes precedence
-because it overrides the model sent to the gateway. Restart Copilot through `ug`
-to change the wire model or API; in-session model selection does not rebuild its
-provider configuration.
+`ug copilot` lists every Claude and GPT model you can use on the workspace in
+Copilot's `/model` picker, and you can switch between them mid-session. Claude
+models use the Anthropic Messages API, GPT-5 and newer use Responses, and older
+GPT models use Chat Completions. Gemini and open-source models aren't offered.
+`ug copilot --model claude-opus-5-5` (or `system.ai.claude-opus-5-5`, or Copilot's
+own `dbx-anthropic/system.ai.claude-opus-5-5`) picks the model a session starts on;
+an unknown or unsupported model fails before Copilot starts and lists the
+available ones. ug passes Copilot a per-session model registry, so your own
+`~/.copilot/providers.json` and `COPILOT_PROVIDER_*` settings apply only to plain
+`copilot`. Use plain `/model`, not `/model --global`, inside `ug copilot`: a
+global choice is saved for plain `copilot` too, where the Databricks models don't
+exist. Requires Copilot CLI 1.0.91 or newer.
 
 `ug copilot` runs Copilot against a loopback proxy for the session. Copilot holds only
-a random session secret; the proxy adds a fresh Databricks token to each gateway
-request, so OAuth sessions keep working past token expiry without a restart, and no
-token is written to `~/.copilot/ucode.env`. If the Databricks sign-in itself expires,
+a random session secret, kept in the session's `~/.copilot/ug-providers-<id>.json`
+registry (readable only by you, deleted when the session ends); the proxy adds a fresh Databricks token to
+each gateway request, so OAuth sessions keep working past token expiry without a
+restart, and no Databricks token is written to disk. If the Databricks sign-in itself expires,
 Copilot shows a "Databricks sign-in expired" error; run `databricks auth login` and
 restart `ug copilot`. Proxy errors are logged to `~/.ucode/logs/copilot-proxy.log`.
 

scripts/run_integration.py

@@ -759,6 +759,13 @@ def run(command, *, cwd=output, env=base_env, timeout=600) -> str:
         runtime_paths = [runtime_bin, agent_bin, tool_bin]
         if os.name == "nt":
             system_root = Path(base_env["SYSTEMROOT"])
+            # Copilot's shell tool tries pwsh first; Windows PowerShell alone can miss its 40s
+            # startup probe. pwsh loads pwsh.dll beside it, so it can't go in tool_bin; expose
+            # only a dedicated install dir, never a shared alias dir like WindowsApps.
+            pwsh = shutil.which("pwsh", path=base_env.get("PATH"))
+            pwsh_dir = Path(pwsh).resolve().parent if pwsh else None
+            if "copilot" in agents and pwsh_dir and (pwsh_dir / "pwsh.dll").is_file():
+                runtime_paths.append(pwsh_dir)
             runtime_paths.extend(
                 [
                     system_root / "System32",

src/ucode/agents/__init__.py

@@ -529,7 +529,7 @@ def check_gateway_endpoint(state: dict, tool: str) -> bool:
     if tool == "gemini":
         return bool(state.get("gemini_models"))
     if tool == "copilot":
-        return bool(state.get("claude_models")) or bool(state.get("codex_models"))
+        return bool(copilot.copilot_catalog(state))
     if tool == "pi":
         return (
             bool(state.get("claude_models"))
@@ -545,7 +545,7 @@ def check_gateway_endpoint(state: dict, tool: str) -> bool:
     "kilo": ("claude", "gemini", "oss"),
     "codex": ("codex",),
     "gemini": ("gemini",),
-    "copilot": ("claude", "codex"),
+    "copilot": ("copilot",),
     "pi": ("claude", "codex", "gemini"),
 }
 

src/ucode/agents/args.py

@@ -11,6 +11,7 @@ class LaunchOptions:
 
     launch_smart_routing: bool = False
     user_pinned_model: str | None = None
+    launch_model: str | None = None
 
 
 def explicit_model_arg_value(tool_args: list[str]) -> str | None: