pp-shopper - SKILL.md Agent Skill

name: pp-shopper description: "The first CLI for Shopper — every catalog, cart Trigger phrases: search shopper for arroz, what's in my shopper basket, when is my shopper charge, did my shopper prices go up, what should I restock on shopper, use shopper, run shopper." author: "educrvz" license: "Apache-2.0" argument-hint: " [args] | install cli|mcp" allowed-tools: "Read Bash" metadata: openclaw: requires: bins: - shopper-pp-cli install: - kind: go bins: [shopper-pp-cli] module: github.com/mvanhorn/printing-press-library/library/commerce/shopper/cmd/shopper-pp-cli

Shopper — Printing Press CLI

Prerequisites: Install the CLI

This skill drives the shopper-pp-cli binary. You must verify the CLI is installed before invoking any command from this skill. If it is missing, install it first:

Install via the Printing Press installer:

npx -y @mvanhorn/printing-press-library install shopper --cli-only

Verify: shopper-pp-cli --version
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/shopper/cmd/shopper-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.

Shopper's recurring basket, fixed charge-7-days-before clock, and drifting prices produce a time series the official app discards every cycle. This CLI keeps it in a local SQLite store, unlocking charge-calendar, basket diff, price-watch, restock prediction, catalog-drift detection, and cashback optimization — none of which any Shopper interface offers.

When to Use This CLI

Use this CLI to inspect and reason about a Shopper grocery subscription: search the catalog, read the recurring basket and delivery schedule, and answer cross-cycle questions about price changes, charge dates, restock timing, and cashback. It shines for questions the web UI can't answer because it only shows the current cycle.

Anti-triggers

Do not use this CLI for:

Do not use this CLI to place or pay for an order — checkout/payment is intentionally out of scope.
Do not use it for non-Shopper grocery services (iFood, Daki, Rappi, Carrefour).
Do not use it to change account passwords or payment cards.

Unique Capabilities

These capabilities aren't available in any other tool for this API.

Time & Money Clock

charge-calendar — Every upcoming cycle's charge date, edit-lock deadline, and delivery date in one timeline so you never miss an edit window or get surprised by a charge.

Reach for this before any basket edit to answer 'can I still change the order / when does money leave the account'.
```
shopper charge-calendar --weeks 8 --locking-soon --agent
```

Basket Intelligence

basket diff — Compares your current recurring basket against a previous cycle's snapshot to show exactly what was added, dropped, or re-quantified before the template locks.

Reach for this to audit what changed before confirming a cycle, or to explain why this charge differs from the last.
```
shopper basket diff --from last-cycle --to current --agent --select added,removed,price_changed
```
restock predict — Predicts when you'll run out of each staple from your historical buying cadence and suggests what to add to the upcoming basket.

Reach for this to proactively fill the next basket so the household doesn't run out of cafe/arroz/fralda mid-cycle.
```
shopper restock predict --horizon 14d --suggest-adds --agent
```

Price & Catalog Drift

price-watch — Tracks the price history of the SKUs you actually buy and alerts when one rises or drops meaningfully versus your own purchase baseline.

Reach for this before confirming a cycle to catch staples that quietly got pricier, or find real drops worth stocking up on.
```
shopper price-watch --threshold 8% --since 60d --only-basket --agent
```
catalog drift — Flags products you buy that were discontinued, silently swapped, or kept their price while shrinking the pack, surfacing the real R$/kg or R$/L change.

Reach for this when the user asks 'why is my bill the same but I have less', or to auto-find replacements for staples that vanished.
```
shopper catalog drift --metric per-unit --kind shrinkflation,discontinued --since 90d --agent
```

Cashback Optimization

cashback optimize — Computes the cheapest set of items to add (or whether to wait) to cross the next cashback tier, favoring things you'll need anyway.

Reach for this near the edit deadline to decide whether topping up the basket earns net-positive cashback without buying junk.
```
shopper cashback optimize --tier 2399 --reward 100 --prefer-restock --agent
```

Command Reference

address — Operations on address

shopper-pp-cli address — GET /address/

cart — Operations on summary

shopper-pp-cli cart add — Add a product to the cart or increase its quantity
shopper-pp-cli cart summary — GET /cart/summary
shopper-pp-cli cart remove — Remove a product from the cart or decrease its quantity

catalog — Operations on departments

shopper-pp-cli catalog count — POST /catalog/search/count
shopper-pp-cli catalog filters — POST /catalog/search/filters
shopper-pp-cli catalog search — POST /catalog/search
shopper-pp-cli catalog banner-view — GET /catalog/banners/{banner_id}/view
shopper-pp-cli catalog banners — GET /catalog/banners
shopper-pp-cli catalog departments — GET /catalog/departments
shopper-pp-cli catalog news — GET /catalog/products/news
shopper-pp-cli catalog suggest — GET /catalog/search/suggest

delivery — Operations on summary

shopper-pp-cli delivery calendar — GET /delivery/v2/calendar
shopper-pp-cli delivery summary — GET /delivery/summary

features — Operations on toggle

shopper-pp-cli features select — POST /features/stores/select
shopper-pp-cli features start — POST /features/timer/start
shopper-pp-cli features view — POST /features/toggle/view
shopper-pp-cli features stores — GET /features/stores
shopper-pp-cli features tick — GET /features/timer/tick
shopper-pp-cli features toggle — GET /features/toggle

session — Session and social-login validation

shopper-pp-cli session — GET /auth/validation/social

Finding the right command

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

shopper-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.

Recipes

Find a staple and check your price baseline

shopper catalog search 'cafe pilao' --agent --select results.name,results.price && shopper price-watch --only-basket --threshold 5%

Search the catalog, then see whether your tracked staples drifted in price.

Pre-deadline cycle review

shopper charge-calendar --locking-soon --agent && shopper basket diff --from last-cycle --to current --agent

Check which cycle locks soon and audit what changed before it does.

Hit the cashback tier efficiently

shopper cashback optimize --tier 2399 --reward 100 --prefer-restock --agent

Decide the cheapest useful top-up to earn cashback.

Auth Setup

Shopper uses a Bearer JWT. Sign in at shopper.com.br in your browser, copy the token from the Authorization header of any siteapi.shopper.com.br request (DevTools > Network), and set SHOPPER_TOKEN. The CLI also sends app-os-x-version and your store context automatically.

Run shopper-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:
```
shopper-pp-cli address --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
Explicit retries — use --idempotent only when an already-existing create should count as success

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 AND no machine-format flag (--json, --csv, --compact, --quiet, --plain, --select) is set — piped/agent consumers and explicit-format runs get pure JSON on stdout.

Agent Feedback

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

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

Entries are stored locally at ~/.local/share/shopper-pp-cli/feedback.jsonl. They are never POSTed unless SHOPPER_FEEDBACK_ENDPOINT is set AND either --send is passed or SHOPPER_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:

Sink	Effect
`stdout`	Default; write to stdout only
`file:<path>`	Atomically write output to `<path>` (tmp + rename)
`webhook:<url>`	POST the output body to the URL (`application/json` or `application/x-ndjson` when `--compact`)

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.

shopper-pp-cli profile save briefing --json
shopper-pp-cli --profile briefing address
shopper-pp-cli profile list --json
shopper-pp-cli profile show briefing
shopper-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

Code	Meaning
0	Success
2	Usage error (wrong arguments)
3	Resource not found
4	Authentication required
5	API error (upstream issue)
7	Rate limited (wait and retry)
10	Config error

Argument Parsing

Parse $ARGUMENTS:

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

MCP Server Installation

Install the MCP server:

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

claude mcp add shopper-pp-mcp -- shopper-pp-mcp

Verify: claude mcp list

Direct Use

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

Execute with the --agent flag:

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

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