Overview

Washington State transportation data from the WSDOT Traveler API and the WSF Ferry API. Query mountain pass and highway conditions, search alerts and cameras, and track ferry schedules, vessel locations, and terminal space from any MCP client. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.

Tools

Capability reference

wsdot_get_mountain_passes _tool

• No input parameters — returns current conditions for all 16 WA mountain passes (Snoqualmie, Stevens, White, Blewett, Cayuse, and others) in one call
• Fields include road condition, weather, temperature, elevation, and up to two directional traction/travel restrictions
• Use for "is the pass open?", traction-law checks, or winter driving planning

wsdot_search_alerts _tool

• Filter by state route — natural forms all work: "I-90", "90", "090", or "SR 520" / "520"
• Filter by WSDOT region name: Northwest, Olympic, Southwest, South Central, North Central, Eastern (case-insensitive; any other value is rejected with invalid_region)
• Filter by milepost range to scope to a corridor — an alert matches when its extent overlaps the range, so a closure that spans the boundary is returned. Either bound may be given alone; a start above the end is rejected with invalid_milepost_range
• Omit all filters to return all current statewide alerts; stateRoute and region accept at most 200 characters
• Descriptions are normalized to plain text; a link renders inline as link text (url)
• Results ordered by alertId and paged (default 20, max 500) — pass offset/limit; a page also ends early at a 24,000-byte response budget, and the notice reports the next offset

wsdot_get_travel_times _tool

• Covers I-5, I-90, SR 520, SR 99, I-405, SR 167, and others
• Filter by route ("I-5", "5", "SR 520") to get every corridor measured on it, or by any text to match corridor names ("Everett"); route accepts at most 200 characters
• When current time exceeds average, the corridor is congested; the delta is the delay
• Reversible express-lane corridors report no travel time while closed in the queried direction — those figures are omitted rather than reported as zero minutes
• Results are paged (default 50, max 500) — pass offset/limit; a page also ends early at a 24,000-byte response budget, and the notice reports the next offset

wsdot_get_toll_rates _tool

• Covers SR 99 (WSDOT Tunnel), SR 167 HOT Lanes, I-405 Express Lanes, the SR 509 tolled segment, and the SR 520 Bridge
• Rates are time-banded and change dynamically based on traffic conditions
• Filter to one facility with stateRoute — "SR 520", "520", "0520", "I-405", and "405" all work, matched against the posted designation, so "SR 405" matches nothing. A route with no tolled facility returns an empty page whose notice names the tolled routes; the filter (at most 200 characters) is applied before paging and echoed in appliedFilters
• Each row's stateRoute is the bare, zero-padded route number the feed carries ("099", "405") with no route type; the rendered text resolves the posted designation, so I-405 reads as I-405 rather than SR 405
• travelDirection is the feed's code, not the direction of travel: SR 99, SR 509, and SR 520 carry one fixed code per facility although trips run both ways — read direction from the segment's start and end
• Each entry leads with its readable startLocationName → endLocationName segment; the opaque upstream trip key stays available as tripName
• Results are paged (default 50, max 500) — pass offset/limit; a page also ends early at a 24,000-byte response budget, and the notice reports the next offset

wsdot_get_border_waits _tool

• No input parameters — covers I-5 (Peace Arch, Blaine), SR 543 (Pacific Highway, Blaine), SR 539 (Lynden), and SR 9 (Sumas)
• Each crossing reports a general-purpose lane and a Nexus lane; SR 539 adds a truck lane and SR 543 adds truck and FAST truck lanes — eleven entries in crossings[], one per lane
• crossingName is a route code (e.g. I5, SR543Trucks); location.description holds the readable name
• Wait times in minutes; updateTime is ISO 8601. A crossing reporting no current data is still returned — only waitTimeInMinutes is omitted, and the rendered text reads Not available

wsdot_search_cameras _tool

• Filter by state route ("I-90", "90", "SR 520", or "520" all work), WSDOT region code, milepost range, or words in the camera title; stateRoute, region, and titleContains accept at most 200 characters
• Camera road names carry a route-type prefix, so "SR 26" excludes US 26 and "US 97" excludes US 97A; a bare "26" returns both
• Region codes: NW, SW, OL, ER, SC, NC, OS (Oregon — the TripCheck cameras around Portland), and WA (airport cameras plus a few ferry-terminal cameras — most ferry-terminal cameras sit in NW and OL). Case-insensitive; any other value is rejected with invalid_region
• titleContains matches the title as WSDOT wrote it — case-insensitive, every word must appear in any order — so "Snoqualmie" returns Snoqualmie Summit and East Snoqualmie Summit but not Hyak. Titles lead with route and milepost, so filter a route with stateRoute
• Either milepost bound may be given alone; a start above the end is rejected with invalid_milepost_range
• Returns metadata and image URLs — camera images are copyright WSDOT, not fetched as bytes
• Results are ordered by cameraId and paged (default 50, max 500) — pass offset/limit; a page also ends early at a 24,000-byte response budget, and the notice reports the next offset

wsdot_get_ferry_terminals _tool

• No input parameters — returns all 20 WSF ferry terminals; the list rarely changes
• Call this first to resolve human-readable names (e.g. "Bainbridge Island", "Seattle", "Kingston") to the numeric IDs required by wsdot_get_ferry_schedule and wsdot_get_terminal_space
• Each terminal also carries its abbreviation and latitude/longitude

wsdot_get_ferry_routes _tool

• Optional tripDate (ISO 8601 YYYY-MM-DD); defaults to today
• Returns each route's ID, abbreviation, and description, plus terminalPairs: the directed departing → arriving terminal pairs (IDs and names) the route serves that day. These are exactly the pairs wsdot_get_ferry_schedule accepts for that date; a route serving none carries an empty list
• Route IDs correspond to impactedRouteIds in wsdot_get_ferry_alerts — use this tool to resolve alert route IDs to route names
• A date outside the range WSF has published (before today, or past the posted schedule) returns a typed invalid_date error stating WSF's range. A date inside that range with no sailings loaded yet returns an empty list and a notice
• The pairs cost one lookup per route, cached per date until WSF signals a schedule change; if any lookup fails, the whole call fails

wsdot_get_ferry_schedule _tool

• Requires departingTerminalId and arrivingTerminalId, both positive integers — use wsdot_get_ferry_terminals first, or pick a pair from terminalPairs on wsdot_get_ferry_routes
• Optional tripDate (defaults to today) and remainingOnly: true (only future departures for today; ignored for any other date, and the response then reports remainingOnly: false)
• Each sailing carries vesselId (the ID wsdot_get_vessel_locations reports), loadingRule, vesselHandicapAccessible, and annotationIndexes into the pair's annotations, notes such as "No interisland vehicles. Foot passenger and bikes okay." The rendered text lists each sailing's notes under it. WSF does not document loadingRule: 3 appears on nearly every sailing and 1 only on vehicle-restricted ones, so read the notes for the restriction itself
• annotations and the pair-wide sailingNotes arrive from WSF as HTML and are returned as plain text, with links kept as link text (url)
• departureTime and arrivalTime are ISO 8601 UTC, while tripDate is the Pacific service day — an evening sailing therefore carries the following UTC calendar date and will not match tripDate. Convert to America/Los_Angeles before quoting a clock time
• arrivalTime is populated on some routes and absent on others
• No cancellation status — WSF drops a cancelled sailing from the schedule rather than flagging it, so a listed sailing is not confirmation it will run; check wsdot_get_ferry_alerts, which reports disruptions at route level
• An invalid or non-through terminal pair returns a typed invalid_terminal_pair error rather than an empty schedule; its recovery hint points at terminalPairs on wsdot_get_ferry_routes for the same date
• A date WSF has no schedule for returns invalid_date instead — whether it falls outside WSF's published range or inside it with no routes loaded

wsdot_get_vessel_locations _tool

• No input parameters — fields include position, speed, heading, ETA, and dock status for every active WSF vessel
• Use for "where is the ferry now?" or checking if a specific vessel is in service
• Position data may lag 30–60 seconds; many fields are null for vessels not currently operating
• Coordinates render at full upstream AIS precision — no rounding, so both response surfaces report the same position
• A vessel between assignments reports an empty opRouteAbbrev, rendered as none reported rather than omitted

wsdot_get_terminal_space _tool

• Filter to a specific terminal by ID (from wsdot_get_ferry_terminals); omit for all terminals
• driveUpSpaceCount is the key field — zero means the drive-up lane is full. Oversubscribed sailings report a negative count upstream; it is floored to zero so the value never reads as available space
• arrivingTerminalIds lists the terminals a sailing serves and chains straight into wsdot_get_ferry_schedule; itineraryLabel is a display string that may name several stops, not a single destination
• Results are paged by terminal (default 5, max 20) — offset/limit select whole terminals and totalCount counts matching terminals, not sailings; every sailing of a returned terminal is included, so page size varies with how many departures each terminal carries

wsdot_get_ferry_alerts _tool

• No input parameters — active WSF ferry service disruptions, delays, and bulletins
• Each alert carries the bulletin's alertTitle, its one-line alertDescription, and the full bulletinText — detail such as a replacement sailing appears only in the body
• bulletinText is plain text: upstream authors it as HTML, and a link is rendered inline as link text (url)
• Each alert includes impactedRouteIds — cross-reference with wsdot_get_ferry_routes to map route IDs to names
• affectsAllRoutes: true marks a fleet-wide alert, which need not enumerate routes — an empty impactedRouteIds then means every route rather than none

Features

Built on @cyanheads/mcp-ts-core: stdio and Streamable HTTP transports, pluggable auth (none / jwt / oauth), swappable storage (in-memory, filesystem, Supabase, Cloudflare KV/R2/D1), structured logging with optional OpenTelemetry tracing.

WSDOT-specific:

• Dual API integration — WSDOT Traffic API and WSF Ferry API share a single WSDOT_ACCESS_CODE
• Cross-tool linking built into tool descriptions — ferry tools point to wsdot_get_ferry_terminals / wsdot_get_ferry_routes for ID resolution before a lookup
• Normalized response shapes across both APIs — sparse upstream fields surface as optional rather than omitted or defaulted
• Stable pagination — the alert and camera feeds return the same set in more than one row order upstream, so results are sorted by ID to keep a given offset reproducible

Agent-friendly output:

• Typed failure — invalid_access_code and api_unavailable errors carry an explicit recovery hint distinguishing configuration faults from transient upstream ones
• driveUpSpaceCount: 0 and congestion delta fields (delayInMinutes) give agents actionable signal without string parsing
• Partial data preserved — sparse upstream payloads surface null/undefined rather than synthetic defaults (e.g. an omitted waitTimeInMinutes, an absent arrivalTime)
• content[] and structuredContent carry the same values, not just the same fields — a false flag, an empty list, and one populated half of a coordinate pair all render rather than dropping out of the markdown surface that some clients read; a blank or whitespace-only upstream string is absent from both, and a populated one arrives trimmed

Getting started

Public Hosted Instance

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

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

Self-Hosted / Local

Add the following to your MCP client configuration file. You'll need a WSDOT Traveler API access code — register at wsdot.wa.gov/Traffic/api/.

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

Or with npx (no Bun required):

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

Or with Docker:

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

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

MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 WSDOT_ACCESS_CODE=your-access-code bun run start:http
# Server listens at http://localhost:3010/mcp

Prerequisites

• Bun v1.4.0 or higher (or Node.js v24+).
• A WSDOT Traveler API access code. Register at wsdot.wa.gov/Traffic/api/ — registration is free.

Installation

1. Clone the repository:

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

2. Navigate into the directory:

cd wsdot-mcp-server

3. Install dependencies:

bun install

4. Configure environment:

cp .env.example .env
# edit .env and set WSDOT_ACCESS_CODE

Configuration

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

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

Running the server

Local development

• Build and run:

  sh

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

• Run checks and tests:

  sh

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

Docker

docker build -t wsdot-mcp-server .
docker run --rm -e WSDOT_ACCESS_CODE=your-access-code -p 3010:3010 wsdot-mcp-server

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

Project structure

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 in the createApp() arrays in src/index.ts
• Wrap external API calls: validate raw → normalize to domain type → return output schema; never fabricate missing fields

Contributing

Issues are welcome. Run checks and tests before submitting:

bun run devcheck
bun run test

License

Apache-2.0 — see LICENSE for details.