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The Market Calendar

by marketcalendar.tech · remote · no sign-in to list tools · v1.1.0 · published by tech.marketcalendar

Seasonality by month for 9 markets, S&P 500 day by day this month, and US economic release dates.

Changes · 7
CompareRegistry entry

8 tools: 7 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http seasonality https://marketcalendar.tech/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

8 tools

Changes things 7Claude Code: ask
  • day_seasonalityHow an asset has done on a calendar date across all years: average return, share of years up, rank among all days.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    How an asset has done on a calendar date across all years: average return, share of years up, rank among all days. Free for the S&P 500 in the current month; other assets/months return that month's free numbers and a Pro link (pro_required).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • economic_calendarScheduled US economic releases (FOMC, CPI, jobs, PCE, GDP, PPI, retail sales, ISM, JOLTS) in a date range, with US Eastern times.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Scheduled US economic releases (FOMC, CPI, jobs, PCE, GDP, PPI, retail sales, ISM, JOLTS) in a date range, with US Eastern times.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • month_detailDeep dive on one month for one asset: average, median, % of years up, rank among the 12 months, recent years, the cumulative seasonal path through the month, and its strongest/weak…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Deep dive on one month for one asset: average, median, % of years up, rank among the 12 months, recent years, the cumulative seasonal path through the month, and its strongest/weakest days.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • monthly_seasonalityAverage and median return, share of years up, best and worst year for each calendar month of an asset.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Average and median return, share of years up, best and worst year for each calendar month of an asset. Use for 'what's the best month for X', 'is September bad for stocks'.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • seasonal_patternStatistics for well-known S&P 500 calendar effects: santa-claus-rally, sell-in-may, september-effect, best-days-of-the-year, worst-days-of-the-year, turn-of-the-month, presidential…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Statistics for well-known S&P 500 calendar effects: santa-claus-rally, sell-in-may, september-effect, best-days-of-the-year, worst-days-of-the-year, turn-of-the-month, presidential-cycle, january-barometer, options-expiration, pre-holiday, day-of-the-week, midterm-year.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • window_seasonalityEvery past year's return over a calendar window (start and end MM-DD), with average, median, % of years up, best and worst years.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Every past year's return over a calendar window (start and end MM-DD), with average, median, % of years up, best and worst years. Free for S&P 500 windows inside the current month; otherwise returns the covered months' free numbers and a Pro link (pro_required).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
Only reads 1Claude Code: allow
  • list_assetsList the markets covered (S&P 500, Nasdaq, Nasdaq-100, Dow, Russell 2000, Bitcoin, Ethereum, Crude Oil, Gold) with their data start dates.No findings

    Why it is in this group

    • The name "list_assets" says "list": a word for reading.
    Description, as the server wrote it
    List the markets covered (S&P 500, Nasdaq, Nasdaq-100, Dow, Russell 2000, Bitcoin, Ethereum, Crude Oil, Gold) with their data start dates.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http seasonality https://marketcalendar.tech/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__seasonality__list_assets"
    ],
    "ask": [
      "mcp__seasonality__monthly_seasonality",
      "mcp__seasonality__month_detail",
      "mcp__seasonality__day_seasonality",
      "mcp__seasonality__window_seasonality",
      "mcp__seasonality__seasonal_trends",
      "mcp__seasonality__seasonal_pattern",
      "mcp__seasonality__economic_calendar"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as seasonality. Review it before you use it.