port-from-python - SKILL.md Agent Skill

name: port-from-python description: Port a source file from the upstream google-antigravity/antigravity-sdk-python SDK into idiomatic Go, then diff the public API surface for parity. Use when adding or updating functionality that mirrors the Python SDK.

Port from the Python SDK

This repo is a Go port of google-antigravity/antigravity-sdk-python. Use this workflow to port a piece of upstream functionality into idiomatic Go while keeping the public API at parity.

Inputs

$ARGUMENTS is the upstream Python path or symbol to port (e.g. agents/runner.py or Runner). If empty, ask which upstream module to port.

Steps

Fetch the current upstream source. Track main (no releases yet). Use the GitHub API so you read the live file, not a guess:
- gh api repos/google-antigravity/antigravity-sdk-python/contents/<path>?ref=main --jq .content | base64 -d
- If you only have a symbol name, find the file first (code search requires auth): gh api -X GET search/code -f q='<symbol> repo:google-antigravity/antigravity-sdk-python' --jq '.items[].path' Fallback if search is unavailable: list the tree and grep — gh api repos/google-antigravity/antigravity-sdk-python/git/trees/main?recursive=1 --jq '.tree[].path' | grep -i <symbol>
- Record the upstream commit you ported against: gh api repos/google-antigravity/antigravity-sdk-python/commits/main --jq .sha
Port into idiomatic Go — do NOT mirror the Python file layout. Map the Python module onto a sensible Go package. Preserve the public API surface (same operations and semantics), but use Go conventions for naming, error handling, and types. Follow all rules in ~/.claude/instructions/Go.md (formatting, any over interface{}, generics, json-experiment, table-driven map[string]struct{...} tests, b.Loop(), etc.).
Diff the API surface for parity. List the exported Python symbols (classes, functions, constants) from the source and confirm each has a Go counterpart, or note deliberate omissions with a reason. Use gopls (MCP) to inspect the resulting Go package API.
Verify. go build ./... and go test ./... must pass. Write table-driven tests per the global Go conventions. Run modernize -fix -test ./... and confirm formatting is clean.
Report the upstream commit SHA ported against, the Go package(s) created/changed, and any API-parity gaps.