Health & medicines

by fourzerotwo.si · remote · no sign-in to list tools · v1.0.0 · published by si.fourzerotwo

Clinical trials, RxNorm drug lookups, FDA drug and device data, PubMed and NHS organisations.

Changes · 24

Compare Registry entry

29 tools: 24 change things and 5 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things24Claude Code: ask: see these tools
Only reads5Claude Code: allow: see these tools

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

claude mcp add --transport http health https://fourzerotwo.si/mcp/v/health

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warnnhs-organisations__organisation
The server marks "nhs-organisations__organisation" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The input takes a statement or command to run (input.code), which can change anything it can reach.
What this check looks for
Warnopenfda__drug-labels
The server marks "openfda__drug-labels" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "openfda__drug-labels" says "label": a word for a change.
What this check looks for

Tools

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

29 tools

Changes things 24Creates or changes something that can be changed back.Claude Code: ask

clinical-trials__recruitingStudies recruiting (or about to) for a condition in a city, region or country, with the matching trial sites.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
Studies recruiting (or about to) for a condition in a city, region or country, with the matching trial sites. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: Clinical Trials (ClinicalTrials.gov): Recruiting trials near a place
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
clinical-trials__statsHow many registered studies for a condition are recruiting, active, completed, terminated or withdrawn.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 many registered studies for a condition are recruiting, active, completed, terminated or withdrawn. A few free samples a day, then $0.003 USDC per call via x402.
Annotations the server declares
- title: Clinical Trials (ClinicalTrials.gov): Trial counts by status
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
clinical-trials__studyOne study: title, status, phase, conditions, interventions, sponsor, enrolment, dates, eligibility basics, primary outcomes, countries, whether results are posted.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
One study: title, status, phase, conditions, interventions, sponsor, enrolment, dates, eligibility basics, primary outcomes, countries, whether results are posted. Free within the daily allowance, then $0.002 USDC per call via x402.
Annotations the server declares
- title: Clinical Trials (ClinicalTrials.gov): Study by NCT number
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
nhs-organisations__organisationName, status, address, phone/website, roles and relationships (commissioner, operator, geography) for one ODS code.1 finding
Why it is in this group
- The input takes a statement or command to run (input.code), which can change anything it can reach.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "nhs-organisations__organisation" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The input takes a statement or command to run (input.code), which can change anything it can reach.
  What this check looks for
Description, as the server wrote it
Name, status, address, phone/website, roles and relationships (commissioner, operator, geography) for one ODS code. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: NHS Organisations (ODS): Organisation by ODS code
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
nhs-organisations__rolesEvery ODS role code with its name, and the friendly aliases search accepts.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 ODS role code with its name, and the friendly aliases search accepts. Free within the daily allowance, then $0.0005 USDC per call via x402.
Annotations the server declares
- title: NHS Organisations (ODS): Role codes
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__device-510kPremarket 510(k) clearances.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
Premarket 510(k) clearances. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Device 510(k) clearances
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__device-eventsMAUDE medical device adverse event reports.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
MAUDE medical device adverse event reports. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Device adverse events
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__device-recallsMedical device recalls.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
Medical device recalls. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Device recalls
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__drug-adverse-eventsFAERS adverse event reports for a drug.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
FAERS adverse event reports for a drug. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Drug adverse events
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__drug-labelsStructured prescribing information: indications, dosage, warnings, interactions.1 finding
Why it is in this group
- The name "openfda__drug-labels" says "label": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "openfda__drug-labels" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "openfda__drug-labels" says "label": a word for a change.
  What this check looks for
Description, as the server wrote it
Structured prescribing information: indications, dosage, warnings, interactions. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Drug labels
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__drug-ndcNational Drug Code directory entries.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
National Drug Code directory entries. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: NDC directory
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__drug-recallsDrug recall enforcement reports.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
Drug recall enforcement reports. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Drug recalls
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__drugs-fdaFDA approval history (Drugs@FDA) for an application or brand.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
FDA approval history (Drugs@FDA) for an application or brand. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Drug approvals
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__food-adverse-eventsCAERS reports for foods, supplements and cosmetics.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
CAERS reports for foods, supplements and cosmetics. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Food & supplement adverse events
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
openfda__food-recallsFood recall enforcement reports.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
Food recall enforcement reports. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: openFDA: Food recalls
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pubmed__summaryTitle, authors, journal, date and DOI for comma-separated PubMed ids.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
Title, authors, journal, date and DOI for comma-separated PubMed ids. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: PubMed: Article summaries
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__approximateRanked RxNorm candidates for a misspelled or partial drug name.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
Ranked RxNorm candidates for a misspelled or partial drug name. Free within the daily allowance, then $0.002 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: Approximate drug match
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__drugsEvery clinical drug, branded drug and pack for an ingredient or brand name, grouped by RxNorm term type.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 clinical drug, branded drug and pack for an ingredient or brand name, grouped by RxNorm term type. Free within the daily allowance, then $0.002 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: Clinical & branded drugs
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__ndcNational Drug Code (10 or 11 digits) to its RxNorm concept and status.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
National Drug Code (10 or 11 digits) to its RxNorm concept and status. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: NDC to RxCUI
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__ndcsActive National Drug Codes for an RxNorm clinical or branded drug.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
Active National Drug Codes for an RxNorm clinical or branded drug. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: NDCs for an RxCUI
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__propertiesName, synonym, term type and active/obsolete status of an RxCUI.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
Name, synonym, term type and active/obsolete status of an RxCUI. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: Concept properties
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__relatedIngredients, brand names, dose forms and clinical/branded drugs related to an RxCUI.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
Ingredients, brand names, dose forms and clinical/branded drugs related to an RxCUI. Free within the daily allowance, then $0.002 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: Related concepts
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__rxcuiExact (normalised) match of a drug name to its RxNorm concept id(s).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
Exact (normalised) match of a drug name to its RxNorm concept id(s). Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: Drug name to RxCUI
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
rxnorm__spellingCorrectly spelled RxNorm drug names close to the input.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
Correctly spelled RxNorm drug names close to the input. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: RxNorm Drug Names: Spelling suggestions
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

Only reads 5Looks things up and changes nothing.Claude Code: allow

clinical-trials__searchFind studies by condition, intervention (drug/device), location, sponsor or free text, optionally filtered by status and phase.No findings
Why it is in this group
- The name "clinical-trials__search" says "search": a word for reading.
Description, as the server wrote it
Find studies by condition, intervention (drug/device), location, sponsor or free text, optionally filtered by status and phase. Free within the daily allowance, then $0.003 USDC per call via x402.
Annotations the server declares
- title: Clinical Trials (ClinicalTrials.gov): Search clinical trials
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
nhs-organisations__searchFind NHS organisations by name, postcode (or district) and role: gp, pharmacy, trust, trust-site, icb, dental, optical, care-home, hospice, or a role code.No findings
Why it is in this group
- The name "nhs-organisations__search" says "search": a word for reading.
Description, as the server wrote it
Find NHS organisations by name, postcode (or district) and role: gp, pharmacy, trust, trust-site, icb, dental, optical, care-home, hospice, or a role code. Free within the daily allowance, then $0.001 USDC per call via x402.
Annotations the server declares
- title: NHS Organisations (ODS): Search organisations
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pubmed__clinical-trials-searchPubMed citations that are clinical trial reports for a query.No findings
Why it is in this group
- The name "pubmed__clinical-trials-search" says "search": a word for reading.
Description, as the server wrote it
PubMed citations that are clinical trial reports for a query. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: PubMed: Search clinical trial records
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pubmed__pmc-searchFree full-text article ids in PubMed Central.No findings
Why it is in this group
- The name "pubmed__pmc-search" says "search": a word for reading.
Description, as the server wrote it
Free full-text article ids in PubMed Central. A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: PubMed: Search PubMed Central
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
pubmed__searchPubMed ids matching a query (supports PubMed query syntax).No findings
Why it is in this group
- The name "pubmed__search" says "search": a word for reading.
Description, as the server wrote it
PubMed ids matching a query (supports PubMed query syntax). A few free samples a day, then $0.002 USDC per call via x402.
Annotations the server declares
- title: PubMed: Search PubMed
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

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 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http health https://fourzerotwo.si/mcp/v/health

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__health__clinical-trials__search",
      "mcp__health__nhs-organisations__search",
      "mcp__health__pubmed__search",
      "mcp__health__pubmed__pmc-search",
      "mcp__health__pubmed__clinical-trials-search"
    ],
    "ask": [
      "mcp__health__clinical-trials__study",
      "mcp__health__clinical-trials__recruiting",
      "mcp__health__clinical-trials__stats",
      "mcp__health__nhs-organisations__organisation",
      "mcp__health__nhs-organisations__roles",
      "mcp__health__pubmed__summary",
      "mcp__health__rxnorm__rxcui",
      "mcp__health__rxnorm__approximate",
      "mcp__health__rxnorm__spelling",
      "mcp__health__rxnorm__drugs",
      "mcp__health__rxnorm__related",
      "mcp__health__rxnorm__properties",
      "mcp__health__rxnorm__ndc",
      "mcp__health__rxnorm__ndcs",
      "mcp__health__openfda__drug-adverse-events",
      "mcp__health__openfda__drug-recalls",
      "mcp__health__openfda__drug-ndc",
      "mcp__health__openfda__drugs-fda",
      "mcp__health__openfda__device-events",
      "mcp__health__openfda__device-recalls",
      "mcp__health__openfda__device-510k",
      "mcp__health__openfda__food-recalls",
      "mcp__health__openfda__food-adverse-events",
      "mcp__health__openfda__drug-labels"
    ],
    "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 health. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/si.fourzerotwo/health/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Anlyon alternative

24 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Source: MCP Registry. Synced Oct 21, 2026, 18:54 UTC.

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