MCP server exposing 3 tools for vaers.
This URL is a JSON-RPC 2.0 endpoint over HTTP. Issue POST requests with a JSON-RPC body. Browsers and search crawlers land here on GET.
POST https://gateway.pipeworx.io/vaers/mcp
Content-Type: application/json
{"jsonrpc":"2.0","id":1,"method":"tools/list"}vaers_events_by_vaccine — VAERS report counts and severity breakdown (died / life-threatening / hospitalized / disabled / ER visit) by vaccine, for the requested year range. Pass `vaccine` as the VAERS vax_type code (e.g. "COVID19", "FLU4", "HPV9", "VARCEL", "MMR") to get that vaccine's counts; omit it to browse the top vaccines ranked by report volume, which doubles as a way to discover valid codes. Optionally narrow to one `manufacturer` (substring match, e.g. "PFIZER", "MODERNA"). Answers "how many VAERS reports mention the COVID-19 vaccine", "which vaccine has the most reported deaths in VAERS", "Pfizer vs Moderna VAERS report counts". IMPORTANT: a report count is NOT evidence the vaccine caused the event — VAERS accepts any report from anyone, unverified. Every response carries the CDC/FDA disclaimer and `is_causal: false`. This never returns a single report's free text.vaers_events_by_symptom — VAERS report counts by symptom (MedDRA preferred term), optionally filtered to one vaccine and/or year range. Pass `symptom` as a substring (e.g. "headache", "anaphyla", "myocarditis") to count how often it was reported; omit it to see the most-reported symptoms overall (optionally within one vaccine). Answers "how many VAERS reports mention myocarditis after the COVID-19 vaccine", "most commonly reported symptoms for the flu vaccine in 2022". Counts are MENTIONS — a report naming several symptoms and/or several vaccines contributes to each combination, so this is not a count of unique reports. IMPORTANT: a symptom being reported alongside a vaccine is NOT evidence the vaccine caused it — VAERS accepts any report from anyone, unverified. Every response carries the CDC/FDA disclaimer and `is_causal: false`. This never returns a single report's free text.vaers_coverage — What this VAERS pack currently holds: total unique reports, the year range covered, how many distinct vaccine types and manufacturers, and when the seed was last (re)loaded — refresh is a manual re-download of the CDC/FDA data files, not a live feed, so check this before relying on recency. Also returns the top 5 vaccines by report volume as a starting point for vaers_events_by_vaccine.Code samples (curl / TypeScript / one-click client install), schemas, and the live playground are on the pack page:
https://pipeworx.io/packs/vaers/
Pipeworx is an open MCP gateway connecting AI agents to live data. pipeworx.io