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phernandez
0247ef0ead
Every basic-memory CLI invocation paid roughly 2 seconds of module-import cost before any work started, which blew the Claude Code plugin's SessionStart hook budget on cold machines (#886). The cost came from module-level imports that pulled the entire server stack into CLI startup: - mcp/async_client.py imported FastAPI at module level, so every consumer of get_client() loaded FastAPI even for cloud-routed or help-only paths. - mcp/clients/*.py imported call_* helpers from basic_memory.mcp.tools.utils, which executes the whole tools package __init__ — every MCP tool module plus fastmcp and the mcp SDK. - mcp/project_context.py imported fastmcp.Context and ToolError eagerly. - CLI command modules (tool, ci, schema) imported MCP tool functions at module level; db and the import_* commands pulled SQLAlchemy/Alembic and the markdown/file-service stack; status/doctor/orphans/command_utils imported ToolError (the mcp SDK) and basic_memory.db. - schemas/base.py imported dateparser (~0.13s) for one helper function. The fix only defers imports to the point of use (no behavior changes): FastAPI now loads inside _resolve_local_asgi_database alongside the existing lazy api.app import, so it is only paid when a request actually routes through the in-process ASGI transport; the typed clients import call_* per method; project_context uses PEP 563 annotations with Context under TYPE_CHECKING; the CLI command modules import their heavy dependencies inside the command bodies. Tests that patched the old module-level aliases now patch the source modules instead. Measured on a warm cache (python -X importtime / wall time): - import basic_memory.cli.main: 1.92s -> 0.45s - bm --help: 2.40s -> 0.52s - bm tool search-notes --help: 2.40s -> 0.86s A regression test asserts that importing the CLI entry module with full command registration leaves fastapi, sqlalchemy, alembic, fastmcp, mcp, basic_memory.api.app, basic_memory.db, basic_memory.markdown, basic_memory.mcp.tools, and basic_memory.services out of sys.modules. Fixes #886 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: phernandez <paul@basicmachines.co>