diff --git a/pyproject.toml b/pyproject.toml
index 9bcd8d5..5765fa1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,3 +54,7 @@ select = ["E", "F", "I", "UP", "B"]
 python_version = "3.11"
 strict = true
 warn_unused_configs = true
+
+[[tool.mypy.overrides]]
+module = ["chromadb", "chromadb.*"]
+ignore_missing_imports = true
diff --git a/src/tai/chroma_telemetry.py b/src/tai/chroma_telemetry.py
index 310c65e..0e81c3c 100644
--- a/src/tai/chroma_telemetry.py
+++ b/src/tai/chroma_telemetry.py
@@ -9,7 +9,6 @@ from __future__ import annotations
 
 from chromadb.config import System
 from chromadb.telemetry.product import ProductTelemetryClient, ProductTelemetryEvent
-from overrides import override
 
 
 class NoOpProductTelemetryClient(ProductTelemetryClient):
@@ -18,7 +17,6 @@ class NoOpProductTelemetryClient(ProductTelemetryClient):
     def __init__(self, system: System):
         super().__init__(system)
 
-    @override
     def capture(self, event: ProductTelemetryEvent) -> None:
         del event
         return None
\ No newline at end of file
diff --git a/src/tai/cli.py b/src/tai/cli.py
index 8dbd50e..22b048a 100644
--- a/src/tai/cli.py
+++ b/src/tai/cli.py
@@ -411,7 +411,7 @@ async def _interactive_loop(
             else:
                 line = sys.stdin.readline()  # non-TTY / piped mode
                 if not line:
-                    return
+                    return last_response
                 command = line.strip()
                 console.print(f"\n[bold cyan]tai[/bold cyan][dim] >[/dim] {command}")
         except (EOFError, KeyboardInterrupt):
diff --git a/src/tai/runbook_store.py b/src/tai/runbook_store.py
index 42778e6..4f34969 100644
--- a/src/tai/runbook_store.py
+++ b/src/tai/runbook_store.py
@@ -17,7 +17,7 @@ from __future__ import annotations
 import re
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 if TYPE_CHECKING:
     from tai.ai_client import AIClient
@@ -123,7 +123,7 @@ class RunbookStore:
             self._client = chromadb.PersistentClient(path=str(path))
         else:
             self._client = chromadb.PersistentClient(path=str(path), settings=settings)
-        self._collection = self._client.get_or_create_collection(
+        self._collection: Any = self._client.get_or_create_collection(
             name=_COLLECTION_NAME,
             metadata={"hnsw:space": "cosine"},
         )
@@ -241,11 +241,14 @@ class RunbookStore:
             return []
         results = self._collection.get(include=["metadatas"])
         metas = results.get("metadatas") or []
-        return [dict(m) for m in metas]
+        entries: list[dict[str, str]] = []
+        for meta in metas:
+            entries.append({str(k): str(v) for k, v in dict(meta).items()})
+        return entries
 
     def count(self) -> int:
         """Return the number of indexed runbook documents."""
-        return self._collection.count()
+        return int(self._collection.count())
 
 
 # ---------------------------------------------------------------------------
diff --git a/src/tai/session_store.py b/src/tai/session_store.py
index a2d3564..63ef633 100644
--- a/src/tai/session_store.py
+++ b/src/tai/session_store.py
@@ -5,7 +5,7 @@ from __future__ import annotations
 from dataclasses import dataclass
 from datetime import UTC, datetime
 from pathlib import Path
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 if TYPE_CHECKING:
     from tai.ai_client import AIClient
@@ -48,14 +48,14 @@ class SessionStore:
             self._client = chromadb.PersistentClient(path=str(path))
         else:
             self._client = chromadb.PersistentClient(path=str(path), settings=settings)
-        self._collection = self._client.get_or_create_collection(
+        self._collection: Any = self._client.get_or_create_collection(
             name=_COLLECTION_NAME,
             metadata={"hnsw:space": "cosine"},
         )
 
     def count(self) -> int:
         """Return number of indexed session summaries."""
-        return self._collection.count()
+        return int(self._collection.count())
 
     def index_session(self, host: str, issue: str, summary: str, ai: AIClient) -> str:
         """Embed and upsert one session summary into persistent storage."""