Three cold-start cuts, measured with .venv python, PYTHONPATH=worktree,
median of 3-5 fresh subprocesses:
1. tools/mcp_oauth.py — availability now via importlib.util.find_spec("mcp");
SDK classes (OAuthClientProvider et al.) import lazily on first use via
_ensure_sdk_loaded(). Module-level names kept as None placeholders so the
test-patch surface (patch.object(mcp_oauth, "OAuthClientProvider", ...))
still works. import tools.mcp_oauth: 242ms -> 56ms (mcp SDK no longer
loaded at import time).
2. tools/registry.py — discover_builtin_tools AST scan memoized in an
mtime_ns+size-keyed disk cache at ~/.hermes/cache/tool_discovery_cache.json
(atomic write via utils.atomic_json_write, best-effort/never raises;
corrupt or missing cache -> full rescan + rewrite; per-file stat mismatch
-> rescan just that file). Scan of 100 files: 158ms cold -> 3ms warm.
3. tools/browser_tool.py — top-level `import requests` and
agent.auxiliary_client.call_llm moved to lazy first-use (PEP 562
__getattr__ preserves patch("tools.browser_tool.requests.get") and
patch("tools.browser_tool.call_llm") surfaces; internal call sites go
through _lazy_call_llm which reads module globals so patches are honored).
Entry-point imports (median ms, before -> after):
import model_tools 392 -> 245 (warm discovery cache)
import cli 152 -> 151 (unchanged; cli doesn't hit these paths)
import gateway.run 234 -> 230
Functional verification:
- get_tool_definitions(quiet_mode=True) under temp HERMES_HOME: identical
sorted 30-tool name set before vs after (empty diff).
- Discovery cache: delete cache -> 158ms, second run -> 3ms; corrupt cache
-> clean full rescan; touching one file -> single-file rescan (12ms).
- Tests green: tests/tools/test_registry.py, all test_mcp_oauth*,
test_mcp_dashboard_oauth, test_mcp_tool_401_handling, all
tests/tools/test_browser*.py, tests/hermes_cli/test_mcp_{config,startup,
dashboard_oauth}.py, test_skills_tool_discovery_cache.py.
teknium1
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