`apm install pm-skills@awesome-copilot` invokes `git clone --depth=1 --branch=<ref>` against the source repo. `git clone --branch` rejects `refs/tags/v2.1.0` ("Remote branch not found in upstream origin") and only accepts the plain tag name.
Matches the convention used by the other entries in this file - `chrome-devtools-plugin` uses `chrome-devtools-mcp-v1.0.1`, `ai-ready` uses a SHA. `pm-skills` was the only entry with the `refs/tags/` prefix, inherited from the placeholder example in the external-plugin issue form.
Tested locally: with the fix applied, `apm install pm-skills@awesome-copilot --target claude` resolves cleanly (12 skills + MCP server + 2 hooks integrated).
Original submission: github/awesome-copilot#1767 / github/awesome-copilot#1770
Parth Sangani
7fbf75ae85