Agent skill · data analytics · mvanhorn
pp-ebay
Printing Press CLI for eBay. Discovery and intelligence: sold-comp pricing (average sale price over 90 days with outlier trim), auctions filtered by bid count and ending window (the query the eBay site can no longer answer), watchlists, saved searches, and a local SQLite store for cross-listing analytics. Trigger phrases: 'comp this card', 'find ebay auctions ending soon', 'what did this sell for', 'find listings under $X for ...'. Bid placement (bid, snipe, bid-group) is experimental and currently fails because eBay step-ups auth on /bfl/placebid -- direct the user to bid in the browser.
Why this skill is useful
Adds a CLI tool with unique commands for eBay auction intelligence and pricing analytics that aren't available elsewhere.
What it needs
Requires ebay-pp-cli installed locally. About 8k tokens when loaded. Last updated 2026-08-06. 1,890 stars on the source repository.
What this skill does
<!-- GENERATED FILE — DO NOT EDIT. This file is a verbatim mirror of library/commerce/ebay/SKILL.md, regenerated post-merge by tools/generate-skills/. Hand-edits here are silently overwritten on the next regen. Edit the library/ source instead. See the repository agent guide, section "Generated artifacts: registry.json, cli-skills/". --> eBay — Printing Press CLI Prerequisites: Install the CLI This skill drives the ebay-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: ebay-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. Unique Capabilities These capabilities aren't available in any other tool for this API. Discovery and intelligence auctions — Search active auctions filtered by bid count and ending window (e.g. "Steph Curry cards with at least 3 bids ending in next hour"). The eBay site can no longer answer this query since the Finding API was retired in February 2025. Finds price-discoverable competition windows where last-second bidding actually moves the price. comp — Average sale price for any item over the last 90 days with smart matching, condition normalization, outlier trim, and percentile distribution. When pricing a bid (or deciding whether to even bother), you need the realistic distribution of recent sales, not a single anchor. Trim handles outliers; dedupe handles title variants. comp outlier trim — 1.5x IQR outlier trim on sold-comp results. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills mvanhorn/pp-ebay