Pp Discogs

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Discogs — Printing Press CLI

Prerequisites: Install the CLI

This skill drives the discogs-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:

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

2. Verify: discogs-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). This installs into $GOPATH/bin (default $HOME/go/bin), so add that directory to $PATH instead:

go install github.com/mvanhorn/printing-press-library/library/media-and-entertainment/discogs/cmd/discogs-pp-cli@latest

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.

A single Go binary over the full Discogs API — database, collection, wantlist, and marketplace — with an offline SQLite mirror and an MCP server. Because Discogs keeps no price history, this CLI snapshots prices locally, which unlocks fills (wantlist limit orders), undervalued detection, portfolio value over time, and condition-matched comps that no other Discogs tool offers.

When to Use This CLI

Use this CLI when an agent or script needs to work with Discogs data programmatically: searching the database, managing a collection or wantlist, pricing or listing records on the marketplace, or answering value/deal questions that need price history. It is the right tool when the task benefits from a local mirror, structured JSON output, or repeated queries under the rate limit.

Anti-triggers

Do not use this CLI for:

• Fetching cover-art images (Discogs image URLs are Cloudflare-gated and unreliable server-side)
• Multi-user OAuth app authentication (this CLI is single-user personal-token only)
• Editing another user's collection or wantlist (only your own account)
• eBay or Gixen auction sniping (this CLI is Discogs-only)

Unique Capabilities

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

Local price history (the moat)

• fills — Treat each wantlist entry as a standing limit order and surface the ones now selling at or below the max price you set.

  Reach for this to answer 'which of my wants are buyable right now' without checking hundreds of listings by hand under the 60/min limit.

  discogs-pp-cli fills --agent

• portfolio — Chart your collection's value over time with per-record contribution to the change and cost-basis P&L.

  Use it when the question is 'is my collection up or down, and because of what' rather than 'what is it worth today'.

  discogs-pp-cli portfolio --since 90d --agent

• undervalued — Flag releases whose current asking price sits below their own trailing/suggested baseline.

  Pick this for market-wide mispricing where no preset limit exists; use 'fills' when the trigger is a limit you set.

  discogs-pp-cli undervalued --scope wantlist --agent

• comps — The condition-by-condition price picture for one release, with local snapshot history the API can't provide.

  Use it to price or value a single specific release; use 'pressings' to compare different versions of the same album.

  discogs-pp-cli comps 249504 --agent

• pressings — Rank all versions/pressings of a master release by value and liquidity so you know which pressing to buy, want, or sell.

  Use it to choose among pressings of an album; use 'comps' for the condition breakdown of one specific pressing.

  discogs-pp-cli pressings 96559 --agent

Collector decisioning

• sell-plan — Rank your inventory or collection by net-after-fee proceeds and liquidity so you know what to sell now.

  Reach for this to decide what to list this week; use 'comps' to price one release.

  discogs-pp-cli sell-plan --source collection --agent

• identify — Resolve a physical record's catalog number or barcode to the exact release and show if you own it, want it, and what it's worth.

  Use it crate-digging in a shop to make a buy/skip call fast; use 'search' for open-ended text queries.

  discogs-pp-cli identify --barcode 0720642442524 --agent

Command Reference

collection — Browse and manage your Discogs collection (requires a token).

• discogs-pp-cli collection add — Add a release to a collection folder.
• discogs-pp-cli collection create-folder — Create a new collection folder.
• discogs-pp-cli collection delete-folder — Delete a collection folder (must be empty).
• discogs-pp-cli collection fields — List the custom fields defined on your collection.
• discogs-pp-cli collection find — Find a release's instances in your collection.
• discogs-pp-cli collection folder — Get one collection folder (0 = All).
• discogs-pp-cli collection folders — List your collection folders.
• discogs-pp-cli collection items — List releases in a collection folder (0 = All).
• discogs-pp-cli collection rate-instance — Set the rating on a collection instance.
• discogs-pp-cli collection remove — Remove a release instance from a folder.
• discogs-pp-cli collection rename-folder — Rename a collection folder.
• discogs-pp-cli collection value — Get the min/median/max market value of your collection.

database — Search Discogs and look up releases, masters, artists, and labels (public; a token raises the rate limit).

• discogs-pp-cli database artist — Get an artist by ID.
• discogs-pp-cli database artist-releases — List an artist's releases.
• discogs-pp-cli database community-rating — Get the community rating for a release.
• discogs-pp-cli database label — Get a label by ID.
• discogs-pp-cli database label-releases — List releases on a label.
• discogs-pp-cli database master — Get a master release (the canonical version group).
• discogs-pp-cli database master-versions — List all versions (pressings) of a master release.
• discogs-pp-cli database rate — Set your rating (1-5) for a release.
• discogs-pp-cli database release — Get a specific release by ID.
• discogs-pp-cli database search — Search the Discogs database. Public data; a token raises the rate limit from 25 to 60/min.
• discogs-pp-cli database unrate — Delete your rating for a release.
• discogs-pp-cli database user-rating — Get a specific user's rating for a release.

identity — Your Discogs identity, profile, and contributions (requires a token).

• discogs-pp-cli identity contributions — List a user's database contributions.
• discogs-pp-cli identity profile — Get a user's public profile.
• discogs-pp-cli identity submissions — List a user's database submissions.
• discogs-pp-cli identity whoami — Show the authenticated user's identity (username, id).

inventory — Request and download CSV exports of your marketplace inventory (requires a token).

• discogs-pp-cli inventory export — Request a new CSV export of your inventory.
• discogs-pp-cli inventory export-download — Download a finished inventory export CSV.
• discogs-pp-cli inventory export-get — Get the status of an inventory export.
• discogs-pp-cli inventory exports — List your recent inventory exports.
• discogs-pp-cli inventory upload-get — Get the status of an inventory CSV upload.
• discogs-pp-cli inventory uploads — List recent inventory CSV uploads.

lists — User lists (curated collections of database items).

• discogs-pp-cli lists get — Get one list and its items.
• discogs-pp-cli lists user — List a user's public lists.

marketplace — Marketplace listings, orders, fees, price suggestions, and per-release stats (requires a token).

• discogs-pp-cli marketplace add-order-message — Post a message to an order.
• discogs-pp-cli marketplace create-listing — Create a new marketplace listing.
• discogs-pp-cli marketplace delete-listing — Delete a marketplace listing.
• discogs-pp-cli marketplace fee — Calculate the Discogs marketplace fee for a sale price (USD).
• discogs-pp-cli marketplace fee-currency — Calculate the marketplace fee for a price in a specific currency.
• discogs-pp-cli marketplace inventory — List a seller's marketplace inventory.
• discogs-pp-cli marketplace listing — Get one marketplace listing.
• discogs-pp-cli marketplace order — Get one marketplace order.
• discogs-pp-cli marketplace order-messages — List messages on an order.
• discogs-pp-cli marketplace orders — List your marketplace orders (as seller).
• discogs-pp-cli marketplace price-suggestions — Get suggested marketplace prices per media condition for a release (seller token).
• discogs-pp-cli marketplace stats — Get marketplace stats for a release (lowest price, number for sale).
• discogs-pp-cli marketplace update-listing — Edit an existing marketplace listing.
• discogs-pp-cli marketplace update-order — Update an order's status or shipping.

wantlist — Browse and manage your Discogs wantlist (requires a token).

• discogs-pp-cli wantlist add — Add a release to your wantlist.
• discogs-pp-cli wantlist edit — Edit the notes/rating on a wantlist item.
• discogs-pp-cli wantlist list — List your wantlist.
• discogs-pp-cli wantlist remove — Remove a release from your wantlist.

Finding the right command

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

discogs-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

Deals on your wantlist

discogs-pp-cli fills --agent

Lists wantlist items whose lowest marketplace asking has reached the max price you set, with the change since last check.

Narrow a verbose release payload

discogs-pp-cli database release 249504 --agent --select id,title,year,labels.name,formats.descriptions,lowest_price

A Discogs release is tens of KB; dotted --select paths return only the fields you need so an agent doesn't burn context.

What to sell this week

discogs-pp-cli sell-plan --source collection --agent

Ranks your records by net-after-fee proceeds and liquidity.

Identify a record in-hand

discogs-pp-cli identify --barcode 0720642442524 --agent

Resolves the barcode to a release and tells you if you own it, want it, and its current value.

Value trend over the last quarter

discogs-pp-cli portfolio --since 90d --agent

Charts collection value change and the records that drove it, against cost basis.

Auth Setup

Database search and lookups are public. Everything tied to a user — collection, wantlist, marketplace, identity — needs a free personal access token from discogs.com/settings/developers, set as DISCOGS_TOKEN. The client sends it as Authorization: Discogs token=<token> and always sends a descriptive User-Agent (Discogs returns 403 without one).

Run discogs-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:

  discogs-pp-cli database search mock-value --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, and use --ignore-missing only when a missing delete target 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.

Paths and state

Agents should treat the CLI's path resolver as part of the runtime contract:

• Use --home <dir> for one invocation, or set DISCOGS_HOME=<dir> to relocate all four path kinds under one root.

• Use per-kind env vars only when a specific kind must diverge: DISCOGS_CONFIG_DIR, DISCOGS_DATA_DIR, DISCOGS_STATE_DIR, DISCOGS_CACHE_DIR.

• Resolution order is per-kind env var, --home, DISCOGS_HOME, XDG (XDG_CONFIG_HOME, XDG_DATA_HOME, XDG_STATE_HOME, XDG_CACHE_HOME), then platform defaults.

• config contains settings like config.toml and profiles. data contains credentials.toml, data.db, cookies, and auth sidecars. state contains persisted queries, jobs, and teach.log. cache contains regenerable HTTP/cache files.

• Stored secrets live in credentials.toml under the data dir. Existing legacy config.toml secrets are read for compatibility and leave config.toml on the first auth write.

• Run discogs-pp-cli doctor --fail-on warn to surface path and credential-location warnings. agent-context exposes a schema v4 paths block for agents that need the resolved dirs.

• For MCP, pass relocation through the MCP host config. The MCP binary does not inherit CLI flags:

  {
    "mcpServers": {
      "discogs": {
        "command": "discogs-pp-mcp",
        "env": {
          "DISCOGS_HOME": "/srv/discogs"
        }
      }
    }
  }

Fleet precedence: an inherited per-kind env var overrides an explicit --home for that kind. Use DISCOGS_HOME or per-kind vars as durable fleet levers, and use --home only for a single invocation. Relocation is not reversible by unsetting env vars; move files manually before clearing DISCOGS_HOME, or doctor will not find credentials left under the former root.

Automatic learning

This CLI ships a self-capturing learning loop. The CLI does its own bookkeeping: every invocation is journaled locally, a failed flag followed by a corrected retry auto-derives a flag_alias candidate, and a teach on a query family without a playbook auto-synthesizes a playbook_candidate from the session's journal. Your job is judgment only: recall first, act on surfaced candidates, teach the final answer, playbook amend when you observe a correction. You never record failures by hand.

Step 1: recall before any discovery

Before list/search/drill commands on a new user question, run:

discogs-pp-cli recall "<user's question>" --agent

The response envelope:

{
  "query": "...",
  "normalized": "<normalized form>",
  "query_entities": ["..."],
  "found": true | false,
  "match_score": 0.0,
  "results": [
    { "resource_id": "...", "resource_type": "...", "venue": "...",
      "confidence": 2, "entity_match": "exact|partial|unknown",
      "source": "taught|preseed|pattern", "warnings": ["..."] }
  ],
  "mismatches": [ /* only when --debug-mismatches */ ],
  "warnings": [ /* top-level */ ],
  "candidates": [
    { "id": 12, "class": "flag_alias | playbook_candidate",
      "summary": "...", "sightings": 3, "last_seen": "...",
      "rationale": "...",
      "next_action": ["<trial command>", "discogs-pp-cli learnings confirm 12"] }
  ],
  "playbook": {
    "query_family": "...",
    "playbook": {
      "steps": [ { "cmd": "<command with {slot} substitution>", "purpose": "..." } ],
      "entity_slots": ["$ENTITY"],
      "expected_tool_calls": 3
    },
    "slots_resolved": { "$ENTITY": { "token": "<live token>", "canonical": "<canonical>" } },
    "notes": "<workarounds + gotchas for this query family>"
  },
  "notes": "<duplicate surface for non-playbook callers>"
}

Empty-store short-circuit: if the store has no learnings, playbooks, or candidates yet (recall finds nothing and learnings list and learnings candidates are both empty), skip recall for the rest of this session instead of taxing every query; resume recall-first once something has been taught.

Step 2: decision tree

Read candidates, playbook, notes, results[0], and warnings in that order:

if Candidates present (warnings include "candidates_present"):
    -> candidates are try-then-confirm, never facts. Follow each candidate's
       two-step next_action verbatim: run the trial command first, then run
       `learnings confirm <id>` only after the trial verified the behavior.
       Reject a wrong candidate with `learnings reject <id>`.
    -> NEVER re-teach something recall surfaced as a candidate; confirm or
       reject that candidate instead of teaching a duplicate.
    -> candidates ride alongside playbooks and resource hits, not instead of
       them; continue with the branches below after acting on them.

if Playbook present:
    -> READ Playbook.notes verbatim FIRST (workarounds + gotchas the CLI surface doesn't expose)
    -> replay Playbook.steps in order, substituting Playbook.slots_resolved entries
       for the entity slot tokens. If a step's slot is unresolved, fall back to
       discovery for that step only.
    -> the Playbook's expected_tool_calls is a budget; if you find yourself running
       materially more, record the divergence via `discogs-pp-cli playbook amend`
       at end-of-session.

elif Notes present (no Playbook):
    -> read Notes verbatim before any discovery step; they carry known gotchas
       for this query family even when no structured choreography exists yet.

elif Found AND Results[0].EntityMatch == "exact" AND Results[0].Confidence >= 2:
    -> skip discovery; fetch live data for Results[*].ResourceID in parallel

elif Found AND Results[0].EntityMatch == "partial":
    -> candidate hint, NOT a hit; read the resource title to validate before trusting

elif (any row in Mismatches[] when --debug-mismatches was passed):
    -> treat as cold start; the stored learning is for a different entity
       (different canonical resolved from query_entities)

else:  // Found == false, no playbook, no notes
    -> cold start; run discovery normally; teach the answer afterward (Step 4).
       If the family has no playbook yet, that teach auto-synthesizes a
       playbook candidate from this session's journal - you do not need to
       record one by hand.

Playbook and Notes are orthogonal to the per-resource path. A recall response can carry both a Playbook AND a Results[] hit - use both: the Playbook tells you which choreography to run; the resource hits short-circuit specific steps. Default to skipping mismatches; pass --debug-mismatches only when investigating cold-start surprises.

Candidate judgment details: learnings confirm <id> prints the candidate's full payload before materializing it - check that the printed payload matches the behavior you verified. learnings reject <id> tombstones the derivation signature so the same candidate does not resurface. The envelope carries only the few candidates worth acting on now; discogs-pp-cli learnings candidates lists the full open set.

Graceful degradation: if learnings confirm is an unknown command, you are driving an older binary - ignore the candidates guidance and follow the rest of the protocol.