Matt Van Horn
a1afbce84c
U2 of the Claude Desktop .mcpb bundle plan. - internal/engine/embed.go embeds the vendored Python tree at build time via //go:embed all:vendored. The engine package owns the embed because Go's directive cannot reach outside its own package directory; sync and gitignore paths are updated to match (internal/engine/vendored/ in place of mcp/vendored/). - internal/engine/extract.go materializes the embed into <cache>/last30days-pp-mcp/<version>/ with a .version sentinel that short-circuits re-extraction. Atomic rename from a .tmp sibling means a partial extraction can never be mistaken for complete. Concurrent first-call extractions serialize behind a per-cache-dir sync.Once. - EnsureUserCache honors a LAST30DAYS_CACHE_DIR env override for locked-down filesystems; the override is named in extract errors. - internal/engine/extract_test.go covers happy path, sentinel skip, version bump, 10-goroutine race, empty-version rejection, unwritable cache parent, and the env override (7 tests, all passing). - A tracked vendored/.gitkeep anchors the embed path so the directive matches even before scripts/sync-engine.sh runs.
last30days-pp-mcp
Go MCP server that wraps the last30days Python engine for Claude Desktop. Packaged as a .mcpb bundle (drag-drop install into Claude Desktop).
The MCP server exposes a single research tool that mirrors the /last30days <topic> slash command available in Claude Code. At runtime the binary extracts the vendored Python engine into a per-user cache and shells out to python3 to produce the synthesis input Claude renders.
Architecture
cmd/last30days-pp-mcp/- server entry pointinternal/engine/-embed.FSof the Python engine + cache extractor + subprocess wrapperinternal/tools/- MCP tool handlers (currentlyresearch)internal/engine/vendored/- mirror ofskills/last30days/scripts/, generated byscripts/sync-engine.sh(gitignored). Lives inside the engine package because//go:embedcannot reach files outside its own package directory.manifest.json- MCPB v0.3 manifest consumed by Claude Desktop andprinting-press bundle
Local build
# Mirror the Python engine into vendored/.
bash scripts/sync-engine.sh
# Build for the current host.
go build -ldflags "-X main.Version=dev" -o build/last30days-pp-mcp ./cmd/last30days-pp-mcp
# Package as a .mcpb (requires the printing-press binary on PATH).
printing-press bundle . --skip-build --binary build/last30days-pp-mcp
The output .mcpb lands at build/last30days-pp-mcp-<os>-<arch>.mcpb. Drag it into Claude Desktop's Extensions panel to install.
Runtime requirements
End users need Python 3.12+ on PATH. The bundle ships the engine source but relies on the host interpreter.
Versioning
The MCPB manifest.json version is hand-bumped in the same PR that ships engine changes worth releasing. Release CI stamps the Go binary's main.Version from the tag.