chore: update external connector deployment flow

app-instance/backend/beaver/coordinator/registry/store.py

@@ -15,7 +15,9 @@ class AgentRegistry:
         self.path = self.workspace / "agents" / "registry.json"
         self.path.parent.mkdir(parents=True, exist_ok=True)
         if not self.path.exists():
-            self._write_agents(_builtin_agents())
+            self._write_agents([])
+        else:
+            self._drop_legacy_builtin_agents()
 
     def list_agents(self, *, include_disabled: bool = True) -> list[RegisteredAgent]:
         agents = self._read_agents()
@@ -125,72 +127,14 @@ class AgentRegistry:
         payload = {"version": 1, "agents": [agent.to_dict() for agent in agents]}
         self.path.write_text(json.dumps(payload, ensure_ascii=False, indent=2, sort_keys=True) + "\n", encoding="utf-8")
 
+    def _drop_legacy_builtin_agents(self) -> None:
+        agents = self._read_agents()
+        migrated = [agent for agent in agents if agent.source != "builtin"]
+        if len(migrated) != len(agents):
+            self._write_agents(migrated)
+
 
 def _terms(text: str) -> set[str]:
     normalized = "".join(ch.lower() if ch.isalnum() else " " for ch in text)
     return {part for part in normalized.split() if part}
 
-
-def _builtin_agents() -> list[RegisteredAgent]:
-    return [
-        RegisteredAgent(
-            agent_id="researcher",
-            name="researcher",
-            display_name="Researcher",
-            role="research",
-            description="Finds facts, references, constraints, and implementation options.",
-            system_prompt="You are a research specialist. Gather concise evidence and tradeoffs for the parent task.",
-            capabilities=["research", "analysis", "source review", "requirements"],
-            tags=["planning", "research"],
-            priority=50,
-            source="builtin",
-        ),
-        RegisteredAgent(
-            agent_id="implementer",
-            name="implementer",
-            display_name="Implementer",
-            role="implementation",
-            description="Builds scoped implementation slices and proposes concrete changes.",
-            system_prompt="You are an implementation specialist. Produce practical, scoped implementation output.",
-            capabilities=["implementation", "coding", "refactor", "integration"],
-            tags=["coding", "build"],
-            priority=45,
-            source="builtin",
-        ),
-        RegisteredAgent(
-            agent_id="reviewer",
-            name="reviewer",
-            display_name="Reviewer",
-            role="review",
-            description="Reviews plans, code, outputs, and risks before final synthesis.",
-            system_prompt="You are a review specialist. Focus on defects, missing requirements, and risks.",
-            capabilities=["review", "quality", "risk", "verification"],
-            tags=["review", "quality"],
-            priority=45,
-            source="builtin",
-        ),
-        RegisteredAgent(
-            agent_id="tester",
-            name="tester",
-            display_name="Tester",
-            role="testing",
-            description="Designs and executes verification checks for task outputs.",
-            system_prompt="You are a testing specialist. Identify focused checks and report pass/fail evidence.",
-            capabilities=["testing", "verification", "regression", "qa"],
-            tags=["test", "quality"],
-            priority=40,
-            source="builtin",
-        ),
-        RegisteredAgent(
-            agent_id="documenter",
-            name="documenter",
-            display_name="Documenter",
-            role="documentation",
-            description="Writes and reconciles user-facing and internal documentation updates.",
-            system_prompt="You are a documentation specialist. Produce concise docs aligned with the implementation.",
-            capabilities=["documentation", "explanation", "migration notes", "release notes"],
-            tags=["docs", "communication"],
-            priority=35,
-            source="builtin",
-        ),
-    ]

app-instance/backend/beaver/interfaces/channels/connections/external.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import os
 from typing import Any
 
 from .models import ChannelRuntimeSpec, ValidationResult
@@ -37,6 +38,7 @@ class ExternalConnectorBase:
         self.credential_store = credential_store
         self.sidecar_client = sidecar_client
         self.sidecar_base_url = sidecar_base_url
+        self.callback_base_url = _callback_base_url()
 
     async def start_session(
         self,
@@ -63,7 +65,7 @@ class ExternalConnectorBase:
             "connectionId": connection.connection_id,
             "channelId": connection.channel_id,
             "displayName": connection.display_name,
-            "callbackBaseUrl": "",
+            "callbackBaseUrl": self.callback_base_url,
             "options": dict(options),
         }
         view = dict(await self.sidecar_client.start_session(payload))
@@ -176,6 +178,14 @@ def _policy_runtime_config(options: dict[str, Any]) -> dict[str, Any]:
     return result
 
 
+def _callback_base_url() -> str:
+    for name in ("EXTERNAL_CONNECTOR_CALLBACK_BASE_URL", "BEAVER_CONNECTOR_CALLBACK_BASE_URL"):
+        value = os.environ.get(name, "").strip()
+        if value:
+            return value.rstrip("/")
+    return ""
+
+
 def _string_list(value: Any) -> list[str]:
     if isinstance(value, str):
         raw_items = value.replace("\n", ",").split(",")