Yahoo Finance — Printing Press CLI

Prerequisites: Install the CLI

This skill drives the yahoo-finance-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 yahoo-finance --cli-only
   

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2. Verify: yahoo-finance-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):

go install github.com/mvanhorn/printing-press-library/library/commerce/yahoo-finance/cmd/yahoo-finance-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.

When to Use This CLI

Reach for this CLI when an agent needs Yahoo Finance market data with deterministic JSON output, a local store that compounds across calls (portfolio, watchlist, history cache), or a working session from a rate-limited host. It is the only Yahoo Finance tool that joins your cost basis with live data and survives a 429 via a Chrome cookie fallback.

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.

Local state that compounds

• portfolio perf — Track YTD / 1Y / all-time returns on your holdings with cost basis, dividends, and current price baked in.

  Reach for this when an agent needs to report 'how is my user's portfolio doing this year' — no single Yahoo Finance endpoint encodes cost basis.

  yahoo-finance-pp-cli portfolio perf --agent
  

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• digest — One command: overnight news + biggest movers + earnings today + ex-div dates for everything on your watchlist.

  Use as a single agent call for a 'daily market briefing' across a named set of tickers — replaces 4+ separate endpoint calls.

  yahoo-finance-pp-cli digest --watchlist tech --agent
  

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• portfolio dividends — See total dividend income for the year, per-holding breakdown, and yield on cost.

  Reach for this when the user asks 'how much have I earned in dividends this year' or 'what's my real yield on my JNJ position'.

  yahoo-finance-pp-cli portfolio dividends --year 2026 --agent
  

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• insiders-net-buying — Surface companies where insiders are net buyers in the last N days, filtered to your watchlist.

  Use when an agent needs a 'who's insiders actually buying' signal layer across the user's watchlist.

  yahoo-finance-pp-cli insiders-net-buying --recent 30d --watchlist tech --agent
  

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Agent-native compute

• options-chain — Filter an options chain to ATM/OTM/ITM contracts within a days-to-expiration window.

  Use when an agent needs to surface 'OTM weekly puts on AAPL near earnings' without parsing a thousand-row chain.

  yahoo-finance-pp-cli options-chain AAPL --moneyness otm --max-dte 45 --agent
  

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• screen-local — Run arbitrary P/E, P/B, yield, margin, and growth filters against the data you've synced locally.

  Use to compose custom value/growth screens an agent can apply to a synced universe, far beyond Yahoo's 12 canned screens.

  yahoo-finance-pp-cli screen-local --pe-max 15 --roe-min 0.15 --agent
  

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• compare — Multi-symbol price-plus-dividend total return ranked over a range.

  Use when comparing actual holding-period returns rather than price-only deltas — the only Yahoo CLI that does this offline.

  yahoo-finance-pp-cli compare AAPL MSFT NVDA --range 1y --include-divs --agent
  

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• options-covered-calls — Scan your holdings for covered-call candidates by annualized yield and DTE.

  Use to surface 'wheel-strategy' covered-call candidates from the user's actual stock positions.

  yahoo-finance-pp-cli options-covered-calls --min-yield-annualized 0.10 --max-dte 45 --agent
  

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• watchlist correlate — Pairwise Pearson correlation across the symbols in a named watchlist over a date range.

  Use when an agent needs to flag concentration risk inside a watchlist — 'is this 'tech' watchlist actually 80% AAPL exposure'.

  yahoo-finance-pp-cli watchlist correlate tech --range 6m --agent
  

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Reachability mitigation

• auth login --chrome — Import your live Chrome session cookies when Yahoo's crumb handshake is blocked from your IP.

  Reach for this when an agent's doctor reports 429 from the host's IP — Chrome's session cookies unblock the crumb handshake.

  yahoo-finance-pp-cli auth login --chrome
  

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Command Reference

autocomplete — Legacy autocomplete (faster than search)

• yahoo-finance-pp-cli autocomplete — Autocomplete symbols and company names

chart — Historical OHLCV price data

• yahoo-finance-pp-cli chart <symbol> — Historical price chart data for a symbol

fundamentals — Time series of fundamentals (quarterly/annual)

• yahoo-finance-pp-cli fundamentals <symbol> — Fundamentals time series (EPS, revenue, margin, cash flow, etc.)

insights — Company insights, valuation, and technical events

• yahoo-finance-pp-cli insights — Insights for a symbol: technical events, valuation, research reports

lookup — Symbol search and lookup

• yahoo-finance-pp-cli lookup — Search for symbols, news, and funds matching a query

options — Options chains for equities and ETFs

• yahoo-finance-pp-cli options <symbol> — Options chain for a symbol (calls and puts)

quote — Real-time quotes and quote summaries

• yahoo-finance-pp-cli quote list — Get current quotes for one or more symbols
• yahoo-finance-pp-cli quote summary — Deep quote summary including price, fundamentals, ownership, and filings

recommendations — Symbols related by analyst recommendation

• yahoo-finance-pp-cli recommendations <symbol> — Symbols that share recommendations with the given symbol

screener — Predefined and custom stock screeners

• yahoo-finance-pp-cli screener — Run a predefined screener by ID

trending — Trending symbols by region

• yahoo-finance-pp-cli trending <region> — Top trending symbols in a region right now

Finding the right command

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

yahoo-finance-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

Daily market briefing across your watchlist

yahoo-finance-pp-cli digest --watchlist tech --agent

Single command returns overnight news, biggest movers, earnings today, and ex-div dates for the symbols in the named watchlist.

Year-to-date portfolio performance

yahoo-finance-pp-cli portfolio perf --agent --select symbol,unrealized_pl,total_return_pct

Joins cost basis with live quotes and reinvested dividends. The --select narrows the payload so an agent doesn't burn context on every row.

Find OTM puts on AAPL near 30 DTE

yahoo-finance-pp-cli options-chain AAPL --moneyness otm --max-dte 45 --type puts --agent

Filters the full chain client-side by moneyness and DTE; Yahoo's endpoint doesn't filter.

Custom SQL screen for cheap large caps

yahoo-finance-pp-cli screen-local --pe-max 15 --roe-min 0.15 --market-cap-min 10000000000 --agent

Runs against locally-synced fundamentals; Yahoo's remote screener has only 12 predefined IDs.

Raw SQL over the local store

yahoo-finance-pp-cli sql "SELECT symbol, ROUND(AVG(close), 2) AS avg_close FROM history WHERE date > date('now','-30 days') GROUP BY symbol ORDER BY avg_close DESC LIMIT 10"

Demonstrates the SQLite path; useful when an agent needs aggregations that no canned command covers.

Auth Setup

Yahoo Finance has no API key — it requires a crumb+cookie handshake. The CLI auto-fetches the crumb on first call and persists cookies to ~/.config/yahoo-finance-pp-cli/. If your IP is rate-limited (cloud hosts and many international IPs are), run auth login --chrome to import a logged-in Chrome session so the crumb dance succeeds.

Run yahoo-finance-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:

  yahoo-finance-pp-cli autocomplete --query example-value --agent --select id,name,status
  

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• 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

• Read-only — do not use this CLI for create, update, delete, publish, comment, upvote, invite, order, send, or other mutating requests

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:

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

Entries are stored locally at ~/.local/share/yahoo-finance-pp-cli/feedback.jsonl. They are never POSTed unless YAHOO_FINANCE_FEEDBACK_ENDPOINT is set AND either --send is passed or YAHOO_FINANCE_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.

yahoo-finance-pp-cli profile save briefing --json
yahoo-finance-pp-cli --profile briefing autocomplete --query example-value
yahoo-finance-pp-cli profile list --json
yahoo-finance-pp-cli profile show briefing
yahoo-finance-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 yahoo-finance-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/yahoo-finance/cmd/yahoo-finance-pp-mcp@latest
   

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2. Register with Claude Code:

   claude mcp add yahoo-finance-pp-mcp -- yahoo-finance-pp-mcp
   

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3. Verify: claude mcp list

Direct Use

1. Check if installed: which yahoo-finance-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:

   yahoo-finance-pp-cli <command> [subcommand] [args] --agent
   

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