Pp Ebay — Workflow

Overview

How the pp-ebay skill works, step by step.

Source Workflow

Codex skill workflow.

Step-by-step Workflow

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:

   npx -y @mvanhorn/printing-press install ebay --cli-only
   

2. Verify: ebay-pp-cli --version
3. Ensure $GOPATH/bin (or $HOME/go/bin) is on $PATH.

If the npx install fails (no Node, offline, etc.), fall back to a direct Go install (requires Go 1.26.3 or newer):

go install github.com/mvanhorn/printing-press-library/library/commerce/ebay/cmd/ebay-pp-cli@latest

If --version reports "command not found" after install, the install step did not put the binary 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.

  ebay-pp-cli auctions "Steph Curry rookie" --has-bids --ending-within 1h --json --select item_id,price,bids,time_left
  

• 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.

  ebay-pp-cli comp "Cooper Flagg /50 Topps Chrome" --trim --json --select mean,median,sample_size
  

• comp outlier trim — 1.5x IQR outlier trim on sold-comp results. Surfaces the realistic price band buyers should anchor on, with stddev and quartiles.

  Tells you what a normal buyer actually paid versus a record sale or a fire-sale outlier.

  ebay-pp-cli comp "Rolex Submariner 116610LN" --trim --json --select p25,median,p75,std_dev
  

• comp --dedupe-variants — Collapse near-duplicate sold listings to one exemplar per fingerprint (token-bag, order-insensitive).

  Without dedupe, the comp distribution is biased toward whichever seller listed the same card 5 times.

  ebay-pp-cli comp "Cooper Flagg /50" --dedupe-variants
  

• listings — Active listing search filtered by auction/BIN, condition, and price band.

  ebay-pp-cli listings --nkw "PSA Mariners Griffey" --lh-bin 1 --udlo 10 --udhi 30
  

When to use

• User asks "what did this card / watch / item sell for" → ebay-pp-cli comp "<title>" --trim
• User asks "find auctions ending soon with bids" → ebay-pp-cli auctions "<query>" --has-bids --ending-within 1h
• User asks "find Buy It Now listings under $X for ..." → ebay-pp-cli listings --nkw "<query>" --lh-bin 1 --udhi <max>
• User asks "watch this listing" / "show my watchlist" → ebay-pp-cli watch list
• User asks to bid programmatically → explain the limitation (eBay step-ups auth on /bfl/placebid); link them to bid in the browser. Do not run bid or snipe on their behalf.

Anti-triggers

This CLI is NOT the right tool for:

• Placing bids. bid/snipe/bid-group are experimental and fail end-to-end. Direct the user to bid in their browser.
• Listing items as a seller (use the eBay Sell APIs / Seller Hub directly).
• Order fulfillment or shipping label generation.
• Bulk inventory management for sellers.

Known Limitations

• Bid placement (bid, snipe, bid-group) cannot complete end-to-end because eBay step-ups auth on /bfl/placebid for cookie-only sessions. These commands are hidden from default --help and print a warning when invoked. Users should bid in the browser.
• Rate limiting: Sustained scraping triggers eBay 403s. Recovery: ebay-pp-cli auth refresh and back off.
• Stub commands: Watchlist write paths, saved-search CRUD, feed, offer-hunter ship as "not yet implemented" stubs.

HTTP Transport

This CLI uses Chrome-compatible HTTP transport for browser-facing endpoints. It does not require a resident browser process for normal API calls.

Discovery Signals

This CLI was generated with browser-observed traffic context.

• Capture coverage: 15 API entries from 25 total network entries
• Protocols: html_scraping (95% confidence), rest_json (90% confidence)
• Auth signals: — cookies: cid, s, nonsession, dp1, ebaysid, ds1, ds2, shs, npii
• Generation hints: requires_browser_auth, requires_protected_client, uses_chrome_cookie_import, has_per_request_csrf, has_per_request_fraud_token
• Caveats: placebid_step_up: eBay redirects /bfl/placebid/<id> to sign-in for cookie-only sessions, so bid placement cannot complete from this CLI today; akamai_active: Akamai bot manager active — Surf must use Chrome TLS fingerprint or stdlib HTTP will be blocked; rate_limit: sustained scraping triggers 403s, recover with auth refresh and back off

Command Reference

deal — eBay Deals feed

• ebay-pp-cli deal — Browse the eBay Deals feed

item — Item details

• ebay-pp-cli item <itemId> — Get item detail by listing id

listings — Active listing search (HTML scrape of /sch/i.html)

• ebay-pp-cli listings — Search active eBay listings by keyword

sold — Sold/completed listings (last 90 days, HTML scrape)

• ebay-pp-cli sold — Search sold completed listings by keyword (90 day window)

watch — Watchlist (authenticated, read-only)

• ebay-pp-cli watch — List items in the user's watchlist

Hand-written commands

• ebay-pp-cli comp <query> — Sold-comp intelligence: average sale price, distribution, trendline for items matching the query over the last 90 days.
• ebay-pp-cli auctions <query> — Search active auctions filtered by bid count, ending window, condition. The 'has bids ending in next hour' query.
• ebay-pp-cli feed <saved-search> — Stream new listings matching a saved search, with sold-comp context appended to each item.
• ebay-pp-cli history — Buying history (won, lost, paid) over a configurable window.
• ebay-pp-cli saved-search — Local saved-search CRUD.

Hidden experimental commands

These commands exist in the binary but are excluded from --help because they currently fail end-to-end. Reach them by name (e.g. ebay-pp-cli snipe --help) for details.

• ebay-pp-cli bid — Place bids (experimental; eBay step-up auth blocks).
• ebay-pp-cli snipe <itemId> --max <amount> — Sniper bid (experimental; depends on bid flow).
• ebay-pp-cli bid-group — Coordinated multi-item snipe groups (experimental; depends on snipe).

Finding the right command

When you know what you want to do but not which command does it, ask the CLI directly:

ebay-pp-cli which "<capability in your own words>"

which resolves a natural-language capability query to the best matching command from this CLI's curated feature index. Exit code 0 means at least one match; exit code 2 means no confident match — fall back to --help or use a narrower query.

Auth Setup

This CLI uses a browser session. Log in to .ebay.com in Chrome, then:

ebay-pp-cli auth login --chrome

Requires a cookie extraction tool (pycookiecheat via pip, or cookies via Homebrew).

Run ebay-pp-cli doctor to verify setup.

Agent Mode

Add --agent to any command. Expands to: --json --compact --no-input --no-color --yes.

• Pipeable — JSON on stdout, errors on stderr

• Filterable — --select keeps a subset of fields. Dotted paths descend into nested structures; arrays traverse element-wise. Critical for keeping context small on verbose APIs:

  ebay-pp-cli deal --agent --select id,name,status
  

• Previewable — --dry-run shows the request without sending

• Offline-friendly — sync/search commands can use the local SQLite store when available

• Non-interactive — never prompts, every input is a flag

Response envelope

Commands that read from the local store or the API wrap output in a provenance envelope:

{
  "meta": {"source": "live" | "local", "synced_at": "...", "reason": "..."},
  "results": <data>
}

Parse .results for data and .meta.source to know whether it's live or local. A human-readable N results (live) summary is printed to stderr only when stdout is a terminal — piped/agent consumers get pure JSON on stdout.

Agent Feedback

When you (or the agent) notice something off about this CLI, record it:

ebay-pp-cli feedback "the --since flag is inclusive but docs say exclusive"
ebay-pp-cli feedback --stdin < notes.txt
ebay-pp-cli feedback list --json --limit 10

Entries are stored locally at ~/.ebay-pp-cli/feedback.jsonl. They are never POSTed unless EBAY_FEEDBACK_ENDPOINT is set AND either --send is passed or EBAY_FEEDBACK_AUTO_SEND=true. Default behavior is local-only.

Write what surprised you, not a bug report. Short, specific, one line: that is the part that compounds.

Output Delivery

Every command accepts --deliver <sink>. The output goes to the named sink in addition to (or instead of) stdout, so agents can route command results without hand-piping. Three sinks are supported:

Unknown schemes are refused with a structured error naming the supported set. Webhook failures return non-zero and log the URL + HTTP status on stderr.

Named Profiles

A profile is a saved set of flag values, reused across invocations. Use it when a scheduled agent calls the same command every run with the same configuration - HeyGen's "Beacon" pattern.

ebay-pp-cli profile save briefing --json
ebay-pp-cli --profile briefing deal
ebay-pp-cli profile list --json
ebay-pp-cli profile show briefing
ebay-pp-cli profile delete briefing --yes

Explicit flags always win over profile values; profile values win over defaults. agent-context lists all available profiles under available_profiles so introspecting agents discover them at runtime.

Exit Codes

Argument Parsing

Parse $ARGUMENTS:

1. Empty, help, or --help → show ebay-pp-cli --help output
2. Starts with install → ends with mcp → MCP installation; otherwise → see Prerequisites above
3. Anything else → Direct Use (execute as CLI command with --agent)

MCP Server Installation

1. Install the MCP server:

   go install github.com/mvanhorn/printing-press-library/library/commerce/ebay/cmd/ebay-pp-mcp@latest
   

2. Register with Claude Code:

   claude mcp add ebay-pp-mcp -- ebay-pp-mcp
   

3. Verify: claude mcp list

Direct Use

1. Check if installed: which ebay-pp-cli If not found, offer to install (see Prerequisites at the top of this skill).
2. Match the user query to the best command from the Unique Capabilities and Command Reference above.
3. Execute with the --agent flag:

   ebay-pp-cli <command> [subcommand] [args] --agent
   

4. If ambiguous, drill into subcommand help: ebay-pp-cli <command> --help.

Execution Logic

The skill executes when its trigger fires (slash command, natural-language match, or direct invocation). It reads its references, applies its rules, and produces the documented outputs.

Edge Cases

See the source skill's references/ and scripts/ folders for edge-case handling.

Failure Handling

A skill failure surfaces as a tool error or a partial output; never a silent skip. Re-run with --verbose (where applicable) for diagnostics.

Integration Notes

• Claude — invoked via the Skill tool with skill: "pp-ebay".
• Codex — referenced from AGENTS.md if mirrored.
• Antigravity — referenced from the workspace agent rules if mirrored.
• HQ Project — listed on the landing page Skills section + post-login sidebar.
• MD Project (md.sgnk.ai) — file rendered from Skills/Pp Ebay/workflow.md.
• Obsidian — file rendered with frontmatter + tags.

Usage Examples

Invoke via slash command or natural language matching the skill description.

Source: (none)