Agent skill · software engineering · mvanhorn
pp-pcgs
The first CLI for the PCGS Public API — cert lookup, full CoinFacts extraction, and the 1,000-call-per-day budget... Trigger phrases: `verify a pcgs cert`, `look up a pcgs cert number`, `extract pcgs coinfacts`, `pcgs population report`, `pcgs price guide`, `use pcgs`, `run pcgs`.
Why this skill is useful
Adds a CLI tool with unique commands for interacting with the PCGS API, enabling batch processing and quota management not available elsewhere.
What it needs
Requires pcgs-pp-cli installed locally. About 14k tokens when loaded. Last updated 2026-08-06. 1,890 stars on the source repository.
What this skill does
PCGS — Printing Press CLI Prerequisites: Install the CLI This skill drives the pcgs-pp-cli binary. You must verify the CLI is installed before invoking any command from this skill. If it is missing, install it first: 1. Install via the Printing Press installer. It defaults binaries to $HOME/.local/bin on macOS/Linux and %LOCALAPPDATA%\Programs\PrintingPress\bin on Windows: 2. Verify: pcgs-pp-cli --version 3. Ensure the reported install directory is on $PATH for the agent/runtime that will invoke this skill. If the npx install fails (no Node, offline, etc.), fall back to a direct Go install (requires Go 1.26.6 or newer): If --version reports "command not found" after install, the runtime cannot see the binary directory on $PATH. Do not proceed with skill commands until verification succeeds. When to Use This CLI Use this CLI when you need to verify PCGS certs at scale, extract full CoinFacts metadata for downstream import, or keep a local snapshot of population / price-guide / auction data refreshed under a tight 1,000-call daily budget. It is upstream of any personal collection system, not a replacement for one. Reach for it when an agent needs the raw PCGS record, not a curated subset. When Not to Use This CLI Do not activate this CLI for requests that require creating, updating, deleting, publishing, commenting, upvoting, inviting, ordering, sending messages, booking, purchasing, or changing remote state. This printed CLI exposes read-only commands for inspection, export, sync, and analysis. Unique Capabilities These capabilities aren't available in any other tool for this API. Quota-aware orchestration coin batch — Parse a CSV / JSON wrapper / JSONL / plain-text cert list and look up every cert against PCGS. --dry-run forecasts cost (live calls, cache hits, %-of-quota) without spending a single call. --resumable + --checkpoint split a list larger than the 1,000/day cap across UTC days. --list-certs emits the parsed cert list to stdout without calling. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills mvanhorn/pp-pcgs--9e01ae