---

Tools

Nine tools across two GDELT APIs — DOC API for global print/web news (last 3 months, 65 languages, no auth) and TV API for US television transcripts (2009–Oct 2024, 150+ stations):

Tool	Description
gdelt_search_articles	Search the last 3 months of global news coverage (65 languages) with full-text and filter operators. Returns up to 250 articles.
gdelt_get_coverage_timeline	Retrieve a time series of coverage volume or average tone for a query. volume_with_articles mode includes top articles per spike timestep.
gdelt_get_tone_distribution	Get a tone histogram (bins ~−30 to +30) showing whether coverage is uniformly negative, bimodal, or clustered near neutral.
gdelt_get_coverage_breakdown	Break down coverage volume by source language or source country — a multi-series time series showing geographic propagation.
gdelt_search_tv	Search US television news closed captions (2009–Oct 2024) and return per-station airtime time series.
gdelt_get_tv_clips	Retrieve up to 3,000 matching TV clips with transcript excerpts and Internet Archive viewing links.
gdelt_get_tv_context	Get the 200 most frequent co-occurring words and phrases from TV clips matching a query.
gdelt_get_tv_trending	Retrieve trending topics currently dominating US television news (updated every 15 minutes; no query required).
gdelt_list_tv_stations	List all TV stations with market, network, and monitoring date ranges to verify station availability before querying.

gdelt_search_articles

Search the last 3 months of global news with GDELT's full query syntax.

• Keywords, phrases ("bird flu"), boolean OR, and exclusion (-sports)
• Filter operators: sourcecountry:, sourcelang:, domain:, theme: (GKG taxonomy), tone</tone>
• Proximity and repetition: near20:"flu virus", repeat3:"outbreak"
• Configurable sort (relevance, date) and result count (up to 250)
• Returns URL, title, publication date, domain, language, source country, and social image URL
• Query is echoed in response for chaining

---

gdelt_get_coverage_timeline

Retrieve when coverage of a topic spiked, with three modes:

• volume — normalized percentage of all global coverage per timestep
• volume_with_articles — volume plus top articles driving each spike; use for signal detection without a follow-up search call
• tone — average sentiment score per timestep (combine with gdelt_get_tone_distribution for the full picture)
• Configurable smoothing and time range

---

gdelt_get_tone_distribution

Snapshot tone histogram across all articles matching a query.

• Bins from approximately −30 to +30; each bin includes representative article URLs
• Summary fields: peakNegativeBin, peakPositiveBin, neutralPct (% of articles in the −2 to +2 range)
• Distinct from the tone timeline — distribution across all matching articles, not over time

---

gdelt_get_coverage_breakdown

Multi-series time series showing which countries or languages drove coverage.

• Break down by language or country
• Top 10 series by total volume; remaining series aggregated into an "Other" bucket
• Use to trace how a story propagated geographically

---

gdelt_search_tv

Search US television news transcripts (2009–Oct 2024) with per-station airtime analysis.

• Structured stations parameter (e.g. ["CNN", "FOXNEWS"]) — the server embeds station filters in the query string
• Normalize results to relative % or return raw counts
• TV-specific operators: market:, show:, context:
• Use gdelt_list_tv_stations to verify station active date ranges before querying recent events

---

gdelt_get_tv_clips

Retrieve actual TV news clips driving a coverage signal.

• Up to 3,000 clips per call
• Each clip: show name, station, air timestamp, 15-second transcript excerpt, direct Archive.org link, and optional thumbnail
• Sort by relevance, date descending, or date ascending

---

gdelt_get_tv_context

Vocabulary framing analysis for TV coverage of a topic.

• Returns the 200 most frequent non-stopword terms from matching clips
• Relative frequency scores (query term = 100)
• Use to identify narrative framing, related concepts, or follow-up search terms

---

gdelt_get_tv_trending

Zero-argument entry point for the current TV news cycle.

• Returns trending topics, keywords, and phrases dominating national networks
• Updated every 15 minutes
• Note: coverage data ends Oct 2024; results reflect the archive endpoint, not a live feed

---

gdelt_list_tv_stations

Station metadata lookup before querying.

• All available stations with market, network, monitoring start date, and end date
• isActive flag — true when end date is within the last 24 hours
• Use to verify a station was active during a target time period

Features

Built on @cyanheads/mcp-ts-core:

• Declarative tool definitions — single file per tool, framework handles registration and validation
• Unified error handling — handlers throw, framework catches, classifies, and formats
• Pluggable auth: none, jwt, oauth
• Swappable storage backends: in-memory, filesystem, Supabase, Cloudflare KV/R2/D1
• Structured logging with optional OpenTelemetry tracing
• STDIO and Streamable HTTP transports

GDELT-specific:

• Shared rate-limit queue (1 req/5s) across all tools — enforces GDELT's published limit without caller coordination
• Two service layers (GdeltDocService, GdeltTvService) mapping clean tool parameters to the DOC and TV API URL conventions
• TV station filter operators embedded in query strings internally — callers pass structured stations arrays, not raw query syntax

Agent-friendly output:

• Query echo on every response — searches return the original query and applied timespan so agents can chain calls without re-deriving parameters
• Discriminated series labels — timeline and breakdown responses carry typed label fields ("Volume Intensity", "Average Tone", language/country names) rather than positional arrays
• Structured station metadata — isActive boolean and ISO 8601 date fields let agents reason about TV station availability without parsing date strings
• Partial-coverage signals in distribution output — neutralPct, peakNegativeBin, peakPositiveBin summary fields let agents branch on sentiment without histogramming the raw bins themselves

Getting started

Public Hosted Instance

A public instance is available at https://gdelt.caseyjhand.com/mcp — no installation required. Point any MCP client at it via Streamable HTTP:

{
  "mcpServers": {
    "gdelt-mcp-server": {
      "type": "streamable-http",
      "url": "https://gdelt.caseyjhand.com/mcp"
    }
  }
}

Self-Hosted / Local

Add the following to your MCP client configuration file.

{
  "mcpServers": {
    "gdelt-mcp-server": {
      "type": "stdio",
      "command": "bunx",
      "args": ["@cyanheads/gdelt-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}

Or with npx (no Bun required):

{
  "mcpServers": {
    "gdelt-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@cyanheads/gdelt-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}

Or with Docker:

{
  "mcpServers": {
    "gdelt-mcp-server": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run", "-i", "--rm",
        "-e", "MCP_TRANSPORT_TYPE=stdio",
        "ghcr.io/cyanheads/gdelt-mcp-server:latest"
      ]
    }
  }
}

For Streamable HTTP, set the transport and start the server:

MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http
# Server listens at http://localhost:3010/mcp

Prerequisites

• Bun v1.3.0 or higher (or Node.js v24+).
• No API key required — GDELT is a free public API.

Installation

1. Clone the repository:

git clone https://github.com/cyanheads/gdelt-mcp-server.git

2. Navigate into the directory:

cd gdelt-mcp-server

3. Install dependencies:

bun install

4. Configure environment:

cp .env.example .env
# edit .env if you need to override defaults

Configuration

All configuration is validated at startup via Zod schemas in src/config/server-config.ts. Key environment variables:

Variable	Description	Default
GDELT_BASE_URL	Override the GDELT API base URL for both DOC and TV APIs.	https://api.gdeltproject.org/api/v2
GDELT_REQUEST_DELAY_MS	Minimum milliseconds between GDELT requests (enforces 1 req/5s limit).	5100
MCP_TRANSPORT_TYPE	Transport: stdio or http.	stdio
MCP_HTTP_PORT	Port for the HTTP server.	3010
MCP_HTTP_ENDPOINT_PATH	HTTP endpoint path where the MCP server is mounted.	/mcp
MCP_PUBLIC_URL	Public origin override for TLS-terminating reverse-proxy deployments.	none
MCP_AUTH_MODE	Auth mode: none, jwt, or oauth.	none
MCP_LOG_LEVEL	Log level (debug, info, warning, error, etc.).	info
MCP_GC_PRESSURE_INTERVAL_MS	Opt-in Bun-only forced-GC pressure loop in ms. Try 60000 if heap growth is observed under sustained HTTP load.	0 (disabled)
LOGS_DIR	Directory for log files (Node.js only).	<project-root>/logs
STORAGE_PROVIDER_TYPE	Storage backend: in-memory, filesystem, supabase, cloudflare-kv/r2/d1.	in-memory
OTEL_ENABLED	Enable OpenTelemetry instrumentation.	false

See .env.example for the full list of optional overrides.

Running the server

Local development

• Build and run:

  # One-time build
  bun run rebuild
  
  # Run the built server
  bun run start:stdio
  # or
  bun run start:http
  

• Run checks and tests:

  bun run devcheck   # Lint, format, typecheck, security audit
  bun run test       # Vitest test suite
  bun run lint:mcp   # Validate MCP definitions against spec
  

Docker

docker build -t gdelt-mcp-server .
docker run --rm -p 3010:3010 gdelt-mcp-server

The Dockerfile defaults to HTTP transport, stateless session mode, and logs to /var/log/gdelt-mcp-server. OpenTelemetry peer dependencies are installed by default — build with --build-arg OTEL_ENABLED=false to omit them.

Project structure

Directory	Purpose
src/index.ts	createApp() entry point — registers tools and inits services.
src/config	Server-specific environment variable parsing and validation with Zod.
src/mcp-server/tools	Tool definitions (*.tool.ts). Nine tools across DOC and TV APIs.
src/services/gdelt-doc	GdeltDocService — wraps the DOC API for article search, timelines, tone, and breakdowns.
src/services/gdelt-tv	GdeltTvService — wraps the TV API for transcript search, clips, context, and trending.
src/services/gdelt-rate-limiter	GdeltRateLimiter singleton — shared 1 req/5s queue across both services.
tests/	Unit and integration tests mirroring src/.

Development guide

See CLAUDE.md for development guidelines and architectural rules. The short version:

• Handlers throw, framework catches — no try/catch in tool logic
• Use ctx.log for request-scoped logging, ctx.state for tenant-scoped storage
• Register new tools via the barrels in src/mcp-server/tools/definitions/index.ts
• Wrap GDELT API calls: validate raw JSON → normalize to domain type → return output schema; never fabricate missing fields

Contributing

Issues and pull requests are welcome. Run checks and tests before submitting:

bun run devcheck
bun run test

License

Apache-2.0 — see LICENSE for details.