PreReason

Ask your AI where Treasury yields are. On its own, it reaches for a search result or a raw series and works out the rest by itself. When it prereasons, one get_context call brings back the context already worked out: the 30 year yield at 5.67% on 2026-10-07, the highest reading on the US Treasury's daily par yield curve since July 2001.

Why prereason?

• The analysis, and the data behind it. Each briefing arrives with the reading done: the trend over several windows, where a value sits in its own history, a company's rank among its peers and, where read, its own guidance.
• Every figure dated, every source named. Your agent can say when a number is from and where it came from.
• One call, a whole briefing. A briefing gathers the series a question needs, so the turns go to the answer rather than to lookups.
• The markets in one place. Rates and Treasuries, the Fed, FX, commodities, macro, listed companies in the USA, Japan, Korea and India, and Bitcoin.
• It describes; it never advises. Briefings say what the data shows. They never say what to buy, sell or hold.
• Quick to set up. One block of config for Claude, Cursor, Codex or VS Code, through the npm bridge or the remote server. The catalogue tools need no key; for the rest, the bridge gives you one link to approve in your browser and the key arrives in the running session; the remote server takes your API key as a header.

What it covers

PreReason gives an AI agent market context it can reason with. One call returns a briefing with the analysis already in it: a one line reading, trend direction over several windows, confidence scores, percentile ranks and correlations, and in the deeper briefings a regime label and a plain language narrative. The briefings cover macro, bonds, FX, commodities, Bitcoin, Ethereum and cross asset correlations. Company briefings cover listed companies in the USA, Japan, Korea, India, the UK, France, Austria, Belgium, Denmark, Finland, Iceland, Italy, Lithuania, the Netherlands, Slovenia and Slovakia, one company per call. The catalogue holds 33 live briefings and 293 individual metrics, among them Treasury yields, the latest FOMC statement, the macro release calendar, Treasury auctions, who holds US Treasuries, the Fed balance sheet, M2, net liquidity, the dollar, US crude and gas inventories, gold, silver, copper and wheat, oil, mining and agribusiness companies beside their commodity, AI compute and power demand, Bitcoin price and momentum, Bitcoin network and miner health, spot Bitcoin ETF flows and corporate Bitcoin treasuries. It is served over MCP (a remote server and an npm bridge) and over REST, as Markdown or JSON. Over MCP, the catalogue tools need no account, and a briefing needs a PreReason account, signed in through the connector or with an API key; a free account reads the free briefings. Over REST, a briefing takes an API key or, on the routes that take one, an x402 payment per call with no account.

Quick Start

Option 1: Claude Desktop, no key needed

Requires Node.js 18+, and nothing else: the bridge has no dependencies.

Add this to claude_desktop_config.json and restart Claude Desktop:

{
  "mcpServers": {
    "prereason": {
      "command": "npx",
      "args": ["-y", "@prereason/mcp"],
      "env": { "PREREASON_CLIENT": "claude-desktop" }
    }
  }
}

The catalogue tools work at once. To connect your account, tell Claude "connect me to PreReason", or ask for any briefing: either way Claude shows one link, https://www.prereason.com/claim/PR-XXXX-XXXX. Open it, sign in or create a free account, click Approve. The key arrives in the bridge on its own, is saved to ~/.prereason/credentials.json, and is never shown; ask Claude whether PreReason is connected and it names your plan. Nothing is created in your account until you click Approve, and the link is asked for when you need it, so it never runs out while Claude sits open. If your account already holds as many API keys as it allows, the answer says so instead of looping: revoke a key under Settings on prereason.com, then ask to connect again, or set PREREASON_API_KEY to a key you already have.

Config file location:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

Already have a key? Add it to the env block as "PREREASON_API_KEY": "pr_live_..." and the bridge never asks.

Option 2: Direct HTTP with an API key (Claude Code, Cursor, Windsurf, Codex, Gemini CLI, VS Code, scripts)

Clients that hold their own config can call the endpoint directly, with the key as a header:

# Claude Code
claude mcp add --transport http prereason https://api.prereason.com/api/mcp --header "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "prereason": {
      "type": "http",
      "url": "https://api.prereason.com/api/mcp",
      "headers": { "Authorization": "Bearer YOUR_API_KEY" }
    }
  }
}

Windsurf uses serverUrl instead of url; Gemini CLI uses httpUrl; Codex uses url plus bearer_token_env_var in config.toml. No key yet? Point the client at the endpoint without a header to browse the catalogue, then create a key on the website (below) and add the header.

Option 3: Claude.ai and Claude Desktop custom connector

Add PreReason as a custom connector, choose "No sign-in", and where the Request headers section is available add Authorization with the value Bearer YOUR_API_KEY (the word Bearer and the space are part of the value). Sign in support for connectors is being re-tested and is not offered until it is verified.

Get an API Key

Three ways, all free. The hosted server never hands out a key inside a session and never asks for one.

Through this bridge. Run it with no key set: when you ask your assistant to connect PreReason, or an answer needs a key, it asks PreReason for access on your behalf and shows one approve_url, in its log and in the answer. Open it, sign in or create your account, click Approve, and the bridge saves the key, attached to your account and named Agent: <client_name>.

From code, for an agent with no browser. POST https://api.prereason.com/api/agent/claims (no auth), show the human the approve_url, then poll GET https://api.prereason.com/api/agent/claims/{claim_code} with Authorization: Bearer <claim_token> until status is approved. Docs: prereason.com/docs#agent-access.

On the website. Sign up at prereason.com/signup, then Dashboard > Settings > API Keys. Keys start with pr_live_.

7 MCP Tools

Tool	Auth	Description
list_briefings	Open	List all 33 pre-reasoned market briefings with tier requirements; with search, only those that match a question, and the covered companies it names, each with the entity to pass
list_metrics	Open	List every available metric across the bitcoin, macro, calculated and eth categories
get_health	Open	API health check, version, account tier
get_context	Required	Fetch a pre-reasoned market briefing (markdown or JSON); for a company briefing, entity names the company and block reads one of its 11 parts (see Company Briefings)
get_metric	Required	Fetch a single metric with trend/signal/percentile
get_changes	Required (Basic and above)	What changed since your last call: change events after a cursor, no values
get_news	Required	Dated records of what companies filed and what federal agencies and the Federal Reserve published, newest first, each with its source, its date or time and a link; it states records, not reasons

The npm bridge and the Claude Desktop extension add one tool of their own, connect_account, which the bridge answers itself and the remote server does not offer: with no key yet it returns the one link to approve, and once approved it says the account is connected and on which plan. It never shows a key and never asks for one.

33 Market Briefings

Free (6 briefings)

Briefing	Description
btc.quick-check	Minimal fast context: BTC + Net Liquidity + correlation
btc.context	BTC + liquidity + hash ribbon + difficulty + momentum
macro.snapshot	Fed balance, M2, treasury yields, dollar strength, net liquidity
cross.correlations	BTC correlation matrix vs macro indicators
btc.pulse	Price, 24h change, Bitcoin dominance
btc.grid-stress	Epoch pace and difficulty adjustment forecast

Basic - $19.99/mo (14 briefings)

Briefing	Description
btc.momentum	200D MA support/resistance with 7d/30d/90d momentum and percentile rankings
macro.liquidity	Liquidity indicators with momentum analysis
btc.on-chain	Hash rate, difficulty, transactions, active addresses
cross.breadth	Breadth across SPY, QQQ and IWM, with Bitcoin's correlation to each
btc.miner-survival	Hashprice thermometer with miner stress scoring
btc.etf-flows	Spot BTC ETF net daily flows, aggregate AUM, and per-issuer breakdown
macro.auctions	Treasury auction demand: who bought at the latest auction of each note and bond maturity, against that maturity's own prior 12 auctions, with the auctions announced and scheduled next
bonds.context	Who holds US Treasuries, in short: foreign investors' net purchases (Treasury's TIC), primary dealers' 13 week change in positions (the New York Fed) and speculators' 10 year note futures position (the CFTC), each against its own history, with the 10 year yield and three bond funds
eth.context	Where Ether stands: its price and global 24 hour volume from CoinGecko, its distance from the 200 day average, Lido's stETH APR, the CFTC's CME Ether positioning and OKX's funding rate
commodities.gold	The gold fund (GLD) and gold's own monthly price from the World Bank, with the 10 year real rate, the dollar fund, the CFTC's COMEX gold positioning and the miners' fund, each with its measured relationship to GLD
commodities.silver	The silver fund (SLV) and silver's own monthly price from the World Bank, with the CFTC's COMEX silver positioning and the gold, dollar, copper and silver miners' funds and the 10 year real rate, each with its measured relationship to SLV
commodities.copper	A copper futures fund (CPER) and copper's own monthly price from the World Bank, with the CFTC's COMEX copper positioning and the dollar and gold funds, each with its measured relationship to CPER
commodities.wheat	A wheat futures fund (WEAT) and US soft red winter wheat's own monthly price from the World Bank, with the CFTC's CBOT wheat positioning, the dollar fund and the WTI spot price, each with its measured relationship to WEAT
macro.calendar	The scheduled dates ahead of the main US releases, the FOMC and ECB decisions, the FOMC minutes and the Treasury coupon auctions ahead (the week's, or the next one), each from its publisher's own calendar, with the latest US jobs report, CPI and weekly jobless claims as published and what each release revised

Pro - $49.99/mo (13 briefings)

Briefing	Description
btc.full	Full Bitcoin analysis: macro overlay, momentum, percentiles, correlations and narrative
btc.factors	Multi-factor attribution for BTC price movements
cross.regime	Regime classification (expansion, contraction, transition) with USDT dominance
fx.liquidity	EUR/USD, USD/CNY and dollar strength, with net liquidity and Bitcoin correlations
btc.energy	Production cost model with gas input pressure
btc.treasury	Corporate Bitcoin treasury intelligence from SEC filings
macro.rates	Treasury par yield curve at every maturity, 1M to 30Y, breakeven inflation, 5y5y forward, Germany 10Y
cross.ai-compute	AI compute and power chain: US grid demand against a year earlier, miners' AI hosting agreements from SEC filings, hosting against mining per megawatt
commodities.energy-basket	US oil and gas stocks against the five year norm from EIA's weekly reports, with WTI, Brent and Henry Hub spot prices, the Brent to WTI spread and WTI realised volatility
bonds.full	Who holds US Treasuries: foreign investors, primary dealers and speculators, each against its own history, with the Fed's own Treasury holdings, debt held by the public, the largest foreign holders, what would change each reading and the next reports
commodities.oil-producers	Crude oil beside its covered USA producers: the energy basket's state, WTI and Brent spot prices from EIA, then each integrated major, producer and refiner and two oil field service companies, with its share price, its 1, 3 and 12 month changes beside WTI and the measured 90 day correlation with WTI
commodities.gold-miners	The gold fund (GLD, a share price, not the gold price) and gold's own monthly price from the World Bank beside the covered USA gold and silver miners and royalty and streaming companies, each with its share price, its 1, 3 and 12 month changes beside GLD and the measured 90 day correlation with GLD
commodities.grains-agribusiness	The wheat futures fund (WEAT, not the wheat price) and US soft red winter wheat's own monthly price from the World Bank beside the covered USA grain merchandisers and processors, seed and crop nutrient companies, farm equipment makers and farmland REITs, each with its share price, its 1, 3 and 12 month changes beside WEAT and the measured 90 day correlation with WEAT

Company Briefings

equities.company reads one listed company per call, composed from its own reports (filings with its home market's regulator; for India, its own published results), each figure dated and sourced: USA companies on Basic and above, Japanese, Korean and Indian companies on Pro and above. It describes; it never says what to do.

• Name the company with entity: a USA ticker or CIK (NVDA), a Japanese securities code (7203), a Korean stock code (005930), an Indian company's ISIN (INE018A01030) or the LEI of a company filing in the UK or of a European company (2138002P5RNKC5W2JZ46).
• Not sure of the code? Call list_briefings with search, for example "Toyota earnings": the answer lists the matching covered companies, each with the entity to pass.
• Read one part with block, one of the 11 below, or leave it out for the whole briefing. A part counts one call; the whole briefing counts one for each part it carries. Parts are served for today only.

get_context(briefing="equities.company", entity="7203")
get_context(briefing="equities.company", entity="NVDA", block="valuation")

Part (block)	What it holds
header	Who the company is, the indexes that hold it with their dates, and a line on its peers
what_changed	Its recent filings
situations	Flagged conditions, each with its severity
against_guidance	The company's own stated expectations next to what it reported (USA companies only)
numbers	Income statement, balance sheet and cash flow history, with growth and the company's own history
segments	Business, product and geography splits (USA and Japan)
valuation	The close, market capitalisation, price to earnings, book and sales, enterprise value multiples and free cash flow yield, each with its value a year ago and its own history (closes from StockAnalysis.com)
capital_structure	Debt, liquidity and maturities
quality	Earnings quality and liquidity, including the accrual ratio, cash conversion, current, quick and cash ratios, working capital, asset turnover, and days sales, inventory and payables outstanding
profitability	Returns and cash generation, including free cash flow, its margin and per share, EBITDA, return on equity, assets and invested capital, the payout ratio and the effective tax rate
news	Filed news

Example Prompts

Once connected, try prompts like:

• "Connect me to PreReason"
• "Show me the macro snapshot"
• "Where are Treasury yields, and what did the Fed last decide?"
• "What did NVIDIA report, and how does it rank among its peers?"
• "How is Bitcoin moving with stocks and the dollar?"
• "List available briefings"

Troubleshooting

"Server disconnected" error

• Ensure Node.js 18+ is installed: node --version
• Check your API key starts with pr_live_
• Fully quit Claude Desktop (system tray > Quit) and reopen

Tools not appearing

• Restart Claude Desktop after editing config
• Verify JSON syntax: node -e "JSON.parse(require('fs').readFileSync('path/to/config','utf8'))"

Windows: "'C:\Program' is not recognized"

If you still see this error, ensure you're using the env block (not --header args) as shown in Quick Start above. If the issue persists, install globally and use node:

1. Run: npm install -g @prereason/mcp
2. Use this config (replace YOUR_USER with your Windows username):

{
  "mcpServers": {
    "prereason": {
      "command": "node",
      "args": [
        "C:\\Users\\YOUR_USER\\AppData\\Roaming\\npm\\node_modules\\@prereason\\mcp\\bin\\cli.js"
      ],
      "env": {
        "PREREASON_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Auth errors on get_context / get_metric

• list_briefings, list_metrics, and get_health work without a key
• get_context and get_metric require a valid API key, and get_changes a key on the Basic or Pro plan
• Get a free key at prereason.com/signup

Other MCP Clients

If your client supports remote HTTP servers, use Quick Start Option 2 above. The stdio bridge package is only needed for clients that require stdio transport (e.g. Claude Desktop).

CLI Usage

# No key: the bridge asks for access and prints one link to approve
npx @prereason/mcp

# Ask for access now, save the key, exit (useful before a first run)
npx @prereason/mcp --login

# Forget the saved key
npx @prereason/mcp --logout

# Use a key from the environment (never asks)
PREREASON_API_KEY=pr_live_... npx @prereason/mcp

# Name the app the bridge runs in, so your dashboard names the connection
PREREASON_CLIENT=claude-desktop npx @prereason/mcp

# --header (backward compatible), a custom credentials file, a custom endpoint
npx @prereason/mcp --header "Authorization:Bearer YOUR_API_KEY"
npx @prereason/mcp --credentials-file /path/to/credentials.json
PREREASON_URL=https://custom.endpoint/mcp npx @prereason/mcp

npx @prereason/mcp --help

Key precedence: PREREASON_API_KEY, then --header, then the credentials file (~/.prereason/credentials.json, or PREREASON_CREDENTIALS_FILE, or --credentials-file), then the claim flow. The file holds the key and which claim issued it, never a claim token. On macOS and Linux the directory is created 0700 and the file 0600; Windows has no mode bits, so the file relies on your profile directory's permissions like every other credential store there.

Claude Desktop extension (.mcpb)

mcpb/manifest.json describes the same bridge as a single click Claude Desktop extension, key optional. To build the bundle: npm install --omit=dev, then npx @anthropic-ai/mcpb pack . from the package directory, and install the resulting .mcpb by double clicking it. Submission to the Claude directory goes through the desktop extension form and is a publisher decision.

No dependencies

The bridge ships its own transports and installs nothing. npm ls on it is one line, npx @prereason/mcp fetches one 23 KB tarball and starts, and the code a security review has to read is the code in this repository.

It used to depend on @modelcontextprotocol/sdk for two classes, a stdio transport and a Streamable HTTP client. That pulled in 91 packages and 25 MB on disk, nearly all of it the SDK server half: Express, Hono, CORS, a rate limiter, an OAuth client and a schema validator, none of which a relay ever calls. lib/stdio.js and lib/streamable-http.js replace the two classes the bridge used, keep their framing and their callbacks, and are covered by the suite under test/.

Links

• Documentation
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Privacy Policy

See prereason.com/privacy for data handling practices.

License

MIT