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Search ICD-11

icd11_search
Read-onlyIdempotent

Search ICD-11 for diseases, symptoms, and medical conditions to find diagnosis codes and official multilingual labels. Use it to look up conditions by name or keyword.

Instructions

Search for medical conditions, diseases, and health problems in ICD-11 (International Classification of Diseases, 11th Revision).

Use this tool to:

  • Find ICD-11 codes for diagnoses

  • Search for diseases by name or keyword

  • Look up conditions in multiple languages

Set language for WHO's official translations — e.g. language: "pt" searches and returns the official Portuguese (pt-BR) ICD-11 labels. Never machine-translated.

Returns matching entities with codes, titles, and relevance scores.

Input Schema

NameRequiredDescriptionDefault
queryYesSearch text (disease name, symptom, or keyword)
languageNoLanguage code (default: en). Returns the source's OFFICIAL translation when it exists (e.g. 'pt' for official Portuguese); content is never machine-translated.en
max_resultsNoMaximum number of results (1-100). Default: 25

Output Schema

NameRequiredDescriptionDefault
queryYesThe search text as submitted.
entitiesYesMatching ICD-11 MMS entities in WHO relevance order, at most max_results.
provenanceYesProvenance block: source, URL, data vintage, extraction instant, origin diagnostics, citation, license
attributionYesCanonical source URLs of this response (attribution list)
total_countYesNumber of entities the WHO search returned, before the max_results cap.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed3 schema fields changedv2.4.0
    • addedOutput schema / properties / entities / description
      Added value: +"Matching ICD-11 MMS entities in WHO relevance order, at most max_results."
    • addedOutput schema / properties / query / description
      Added value: +"The search text as submitted."
    • addedOutput schema / properties / total_count / description
      Added value: +"Number of entities the WHO search returned, before the max_results cap."
  2. Changed7 schema fields changedv2.3.0
    • changedOutput schema / properties / provenance / description
      Previous value: -"Provenance block (contract v1.1): source, URL, data vintage, extraction instant, origin diagnostics, citation, license"New value: +"Provenance block: source, URL, data vintage, extraction instant, origin diagnostics, citation, license"
    • addedOutput schema / properties / provenance / properties / derivation_note
      Added value: +{
      +  "description": "What this server computed; present together with derived",
      +  "type": "string"
      +}
    • addedOutput schema / properties / provenance / properties / derived
      Added value: +{
      +  "description": "Present (true) only when this server computed the value (e.g. a ranking or summary statistics) instead of passing on what the source returned",
      +  "type": "boolean"
      +}
    • changedOutput schema / properties / provenance / properties / field_sources / description
      Previous value: -"Present only when the response joins parts from different origins or extraction instants (contract v1.2): for each group of fields, its URL, extraction instant and whether it came from cache. Absent in single-origin responses"New value: +"Present only when the response joins parts from different origins or extraction instants: for each group of fields, its URL, extraction instant and whether it came from cache. Absent in single-origin responses"
    • addedOutput schema / properties / provenance / properties / notices
      Added value: +{
      +  "description": "Caveats the source publishes about the data, verbatim (license statements are not repeated here; see the info://licenses resource). Absent when there is none",
      +  "items": {
      +    "type": "string"
      +  },
      +  "minItems": 1,
      +  "type": "array"
      +}
    • changedOutput schema / properties / provenance / properties / retrieval / description
      Previous value: -"Origin diagnostics of THIS source in this call (contract v1.1): requests made to the upstream, attempts summed across retries, anomalies worked around (kind + count); unstable=true when any anomaly happened. null when nothing was measured (bundled dataset, or response served entirely from cache)"New value: +"Origin diagnostics of THIS source in this call: requests made to the upstream, attempts summed across retries, anomalies worked around (kind + count); unstable=true when any anomaly happened. null when nothing was measured (bundled dataset, or response served entirely from cache)"
    • addedOutput schema / properties / provenance / properties / revision
      Added value: +{
      +  "additionalProperties": false,
      +  "description": "Whether the data can still change at the source: current = the version in force, the source may revise it; provisional = preliminary; final = will not change. Absent when unknown",
      +  "properties": {
      +    "note": {
      +      "description": "O específico da fonte: o que revisa, quando, por quê",
      +      "type": [
      +        "string",
      +        "null"
      +      ]
      +    },
      +    "status": {
      +      "description": "current = versão vigente, a fonte pode revisá-la; provisional = preliminar, incompleta ou sujeita a mudança (não compare como se fosse fechada); final = não muda mais, declarado pela fonte",
      +      "enum": [
      +        "current",
      +        "provisional",
      +        "final"
      +      ],
      +      "type": "string"
      +    }
      +  },
      +  "required": [
      +    "status",
      +    "note"
      +  ],
      +  "type": "object"
      +}
  3. Changed1 schema field changedv2.1.1
    • addedOutput schema / properties / provenance / properties / field_sources
      Added value: +{
      +  "description": "Present only when the response joins parts from different origins or extraction instants (contract v1.2): for each group of fields, its URL, extraction instant and whether it came from cache. Absent in single-origin responses",
      +  "items": {
      +    "additionalProperties": false,
      +    "description": "Proveniência de um grupo de campos da resposta: de onde veio e quando foi extraído",
      +    "properties": {
      +      "data_vintage": {
      +        "description": "Vintage/competência da sub-fonte",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "dataset_id": {
      +        "description": "Identificador do conjunto da sub-fonte",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "fields": {
      +        "description": "Campos do payload atribuídos a esta sub-fonte",
      +        "items": {
      +          "type": "string"
      +        },
      +        "minItems": 1,
      +        "type": "array"
      +      },
      +      "retrieved_at": {
      +        "description": "ISO-8601 da extração desta sub-fonte na origem",
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "served_from_cache": {
      +        "description": "true se esta sub-fonte veio do cache do servidor (retrieved_at é o da extração original); false se foi buscada nesta chamada; null se o servidor não distingue",
      +        "type": [
      +          "boolean",
      +          "null"
      +        ]
      +      },
      +      "source_url": {
      +        "description": "URL canônica da sub-fonte que originou estes campos",
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "fields",
      +      "source_url",
      +      "dataset_id",
      +      "data_vintage",
      +      "retrieved_at"
      +    ],
      +    "type": "object"
      +  },
      +  "minItems": 1,
      +  "type": "array"
      +}
  4. Changed3 schema fields changedv1.15.0
    • changedOutput schema / properties / provenance / description
      Previous value: -"Provenance block (contract v1.0): source, URL, data vintage, extraction instant, citation, license"New value: +"Provenance block (contract v1.1): source, URL, data vintage, extraction instant, origin diagnostics, citation, license"
    • addedOutput schema / properties / provenance / properties / retrieval
      Added value: +{
      +  "anyOf": [
      +    {
      +      "additionalProperties": false,
      +      "properties": {
      +        "anomalies": {
      +          "description": "Anomalias superadas até o sucesso, somadas por classe, em ordem fixa; [] se nenhuma",
      +          "items": {
      +            "additionalProperties": false,
      +            "properties": {
      +              "count": {
      +                "description": "Ocorrências desta classe na chamada",
      +                "maximum": 9007199254740991,
      +                "minimum": 1,
      +                "type": "integer"
      +              },
      +              "kind": {
      +                "description": "Classe da anomalia (vocabulário fechado do contrato)",
      +                "enum": [
      +                  "timeout",
      +                  "network",
      +                  "http_4xx",
      +                  "http_5xx",
      +                  "rate_limited",
      +                  "malformed_body"
      +                ],
      +                "type": "string"
      +              }
      +            },
      +            "required": [
      +              "kind",
      +              "count"
      +            ],
      +            "type": "object"
      +          },
      +          "type": "array"
      +        },
      +        "attempts": {
      +          "description": "Tentativas somadas, incluindo as repetidas (>= requests)",
      +          "maximum": 9007199254740991,
      +          "minimum": 1,
      +          "type": "integer"
      +        },
      +        "requests": {
      +          "description": "Idas distintas à origem que compõem esta resposta (fatias, páginas)",
      +          "maximum": 9007199254740991,
      +          "minimum": 1,
      +          "type": "integer"
      +        },
      +        "unstable": {
      +          "description": "true se houve repetição (attempts > requests) ou alguma anomalia",
      +          "type": "boolean"
      +        }
      +      },
      +      "required": [
      +        "requests",
      +        "attempts",
      +        "anomalies",
      +        "unstable"
      +      ],
      +      "type": "object"
      +    },
      +    {
      +      "type": "null"
      +    }
      +  ],
      +  "description": "Origin diagnostics of THIS source in this call (contract v1.1): requests made to the upstream, attempts summed across retries, anomalies worked around (kind + count); unstable=true when any anomaly happened. null when nothing was measured (bundled dataset, or response served entirely from cache)"
      +}
    • changedOutput schema / properties / provenance / required
      Previous value: -[
      -  "source",
      -  "source_url",
      -  "data_vintage",
      -  "retrieved_at",
      -  "citation",
      -  "license"
      -]New value: +[
      +  "source",
      +  "source_url",
      +  "data_vintage",
      +  "retrieved_at",
      +  "retrieval",
      +  "citation",
      +  "license"
      +]
  5. Changed1 schema field changedv1.11.0
    • addedInput schema / additionalProperties
      Added value: +false
  6. Changed6 schema fields changedv1.9.1
    • removedOutput schema / properties / entities / items / properties / code / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / entities / items / properties / code / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / provenance / properties / data_vintage / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / provenance / properties / data_vintage / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / provenance / properties / license / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / provenance / properties / license / type
      Added value: +[
      +  "string",
      +  "null"
      +]
  7. Changed4 schema fields changedv1.8.0
    • changedInput schema / properties / language / description
      Previous value: -"Language code (default: en)"New value: +"Language code (default: en). Returns the source's OFFICIAL translation when it exists (e.g. 'pt' for official Portuguese); content is never machine-translated."
    • addedOutput schema / properties / attribution
      Added value: +{
      +  "description": "Canonical source URLs of this response (attribution list)",
      +  "items": {
      +    "type": "string"
      +  },
      +  "type": "array"
      +}
    • addedOutput schema / properties / provenance
      Added value: +{
      +  "additionalProperties": false,
      +  "description": "Provenance block (contract v1.0): source, URL, data vintage, extraction instant, citation, license",
      +  "properties": {
      +    "citation": {
      +      "description": "Ready-to-use citation/attribution string",
      +      "type": "string"
      +    },
      +    "data_vintage": {
      +      "anyOf": [
      +        {
      +          "type": "string"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "Version/release of the data as exposed by the source; null when not exposed"
      +    },
      +    "license": {
      +      "anyOf": [
      +        {
      +          "type": "string"
      +        },
      +        {
      +          "type": "null"
      +        }
      +      ],
      +      "description": "License / legal regime of the data"
      +    },
      +    "retrieved_at": {
      +      "description": "Real instant of the upstream extraction (ISO-8601, UTC). Responses served from cache keep the ORIGINAL fetch instant.",
      +      "type": "string"
      +    },
      +    "source": {
      +      "description": "Official upstream source of this data",
      +      "type": "string"
      +    },
      +    "source_url": {
      +      "description": "Canonical URL of the source (API base or dataset release)",
      +      "type": "string"
      +    }
      +  },
      +  "required": [
      +    "source",
      +    "source_url",
      +    "data_vintage",
      +    "retrieved_at",
      +    "citation",
      +    "license"
      +  ],
      +  "type": "object"
      +}
    • changedOutput schema / required
      Previous value: -[
      -  "query",
      -  "total_count",
      -  "entities"
      -]New value: +[
      +  "query",
      +  "total_count",
      +  "entities",
      +  "provenance",
      +  "attribution"
      +]
  8. Changed5 schema fields changedv1.5.7
    • removedInput schema / additionalProperties
      Removed value: -false
    • addedOutput schema / properties / entities / items / properties / code / anyOf
      Added value: +[
      +  {
      +    "type": "string"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / entities / items / properties / code / type
      Removed value: -[
      -  "string",
      -  "null"
      -]
    • addedOutput schema / properties / total_count / maximum
      Added value: +9007199254740991
    • addedOutput schema / properties / total_count / minimum
      Added value: +-9007199254740991
  9. First observedv1.2.1

TDQS

A3.9/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare read-only, idempotent, open-world, non-destructive behavior, so the safety bar is met. The description adds genuinely non-obvious behavior: the language parameter selects WHO official translations only ('Never machine-translated') and that 'pt' maps to pt-BR. It does not mention result ranking/pagination behavior beyond 'relevance scores'.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with a one-line purpose, then a scannable use-case list and a note on language semantics. Some redundancy with the input schema descriptions (the official-translation point appears twice) keeps it short of a 5.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 3-parameter, read-only search tool with an output schema and full annotation coverage, the description supplies everything needed to invoke it correctly: what it searches, what the language flag guarantees, and what comes back. Only sibling routing (search vs. lookup) is left unspecified.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and the schema already documents all three parameters, including the official-translation nuance and the pt-BR example — the description largely repeats this. It adds no new syntax or constraint detail (no max_results guidance, no query-matching semantics), so baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('Search for medical conditions... in ICD-11') plus concrete outcomes (find codes, search by name/keyword). It does not explicitly differentiate from close siblings such as icd11_lookup or cid10_search, and 'Find ICD-11 codes for diagnoses' partially overlaps with what a lookup tool would do.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The bullet list gives clear usage contexts (find codes, keyword search, multilingual lookup), which is stronger than implied usage. However, it offers no exclusions — nothing says when to prefer icd11_lookup (exact code) or cid10_search / map_icd10_to_icd11 instead.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.