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hack-house/cmd_chat
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feat(ai): native host-side tool-calling harness (Phase 2)
Implement the bounded native harness from docs/spec-native-harness.md §1.3 and
make it the default granted-!task path. The model runs host-side (no container→
host Ollama hop); only its tool calls exec in the sandbox.

providers.py:
- OllamaProvider.complete_with_tools(system, messages, tools) -> (text, calls):
  one non-streaming /api/chat turn with a `tools` schema; parses message.tool_calls
  (dict or JSON-string arguments). Caches tool capability (_tools_ok / supports_tools).
- ToolsUnsupported raised when the model rejects `tools` ("does not support tools").

bridge.py:
- NATIVE_SYSTEM + a 3-tool schema (run_shell / write_file / read_file), turn/byte caps.
- _run_native: seed transcript window + task → loop up to max_turns; exec each tool
  call in the sandbox, feed captured output back as a `tool` message; stop on a plain
  answer or the cap; stream per-call progress to chat. Degrades to _run_simple when the
  provider has no complete_with_tools or the model rejects tools.
- _exec_prefix/_exec_capture/_exec_tool: <engine> exec into docker/podman/multipass/local;
  paths passed as positional args + content via stdin (no shell interpolation); combined
  stdout+stderr byte-capped + time-bounded. run_shell is the only intentional shell.
- Guards: DESTRUCTIVE run_shell commands are blocked (not run — no human in the loop;
  use simple + /ai confirm for destructive intent); MAX_COMMANDS budget per task.
- _run_in_sandbox dispatches native|simple; default harness flipped to native.

__main__.py: default harness native (self-degrades to simple, so safe).

Offline-tested: full write/run/read loop on the local backend; destructive block
(rm -rf never executed); ToolsUnsupported → simple fallback. Live Ollama wire
validation deferred to Phase 3 bench (daemon was down). py_compile clean.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-06-08 13:17:21 -07:00
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