Medical Terminologies MCP

Find Equivalents Across Terminologies

find_equivalent

Read-onlyIdempotent

Search medical terminologies to find equivalent concepts across ICD-11, LOINC, RxNorm, and MeSH; compare coding systems and support mapping or data integration.

Instructions

Ranked unified search for equivalent terms across multiple medical terminologies.

Use this tool to:

Find the same concept in different coding systems
Compare how terminologies represent a concept
Support terminology mapping and data integration

Searches across: ICD-11, LOINC, RxNorm, and MeSH. Set target_terminologies to limit which are searched, or set source_terminology to exclude one (e.g. when you already have a code from that terminology and want equivalents elsewhere). The two combine: source is subtracted from targets. limit caps candidates per terminology (default 5, max 10).

Every candidate carries match_score (lexical similarity to the search term, 0-1) and rank (global position across all searched terminologies) — both computed by this server, since upstreams don't expose comparable relevance scores. Candidates from different terminologies whose titles are lexically identical are clustered in groups — a strong same-concept signal (absence of a group is NOT evidence of non-equivalence).

Searches upstreams in English. For official pt-BR content, use the dedicated tools: icd11_search/mesh_search accept language: "pt", and cid10_search is natively Portuguese.

Input Schema

TableJSON Schema

Name	Required	Description
`term`	Yes	Medical term to search (e.g., "diabetes", "aspirin")
`limit`	No	Maximum candidates returned PER terminology (1-10, default 5). This is a cap, not a page: the live fan-out has no stable cursor across five upstreams, so raise the limit instead of paging.
`source_terminology`	No	If set, this terminology is excluded from the search. Use this when the term came from this terminology and you want equivalents in the others. Combines with target_terminologies by subtraction (source is removed from the target list).
`target_terminologies`	No	Limit the search to these terminologies. If omitted, all five are searched.

Output Schema

TableJSON Schema

Name	Required	Description
`term`	Yes
`groups`	Yes
`ranking`	Yes
`results`	Yes
`provenance`	Yes	One provenance block per upstream source that contributed to this response (contract v1.1; licenses are never merged; each block carries the origin diagnostics of ITS source)
`attribution`	Yes	Canonical source URLs of this response (attribution list)
`source_terminology`	Yes
`searched_terminologies`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedv2.0.0Oct 4, 2026

changedInput schema / properties / source_terminology / enum

Previous value: -[
-  "icd11",
-  "snomed",
-  "loinc",
-  "rxnorm",
-  "mesh"
-]New value: +[
+  "icd11",
+  "loinc",
+  "rxnorm",
+  "mesh"
+]

changedInput schema / properties / target_terminologies / items / enum

Previous value: -[
-  "icd11",
-  "snomed",
-  "loinc",
-  "rxnorm",
-  "mesh"
-]New value: +[
+  "icd11",
+  "loinc",
+  "rxnorm",
+  "mesh"
+]

changedOutput schema / properties / groups / items / properties / members / items / properties / terminology / enum

Previous value: -[
-  "icd11",
-  "snomed",
-  "loinc",
-  "rxnorm",
-  "mesh"
-]New value: +[
+  "icd11",
+  "loinc",
+  "rxnorm",
+  "mesh"
+]

changedOutput schema / properties / groups / items / properties / terminologies / items / enum

Previous value: -[
-  "icd11",
-  "snomed",
-  "loinc",
-  "rxnorm",
-  "mesh"
-]New value: +[
+  "icd11",
+  "loinc",
+  "rxnorm",
+  "mesh"
+]

removedOutput schema / properties / results / properties / snomed

Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "error": {
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "found": {
-      "type": "boolean"
-    },
-    "items": {
-      "items": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "type": "string"
-          },
-          "match_score": {
-            "maximum": 1,
-            "minimum": 0,
-            "type": "number"
-          },
-          "rank": {
-            "maximum": 9007199254740991,
-            "minimum": 1,
-            "type": "integer"
-          },
-          "title": {
-            "type": "string"
-          },
-          "uri": {
-            "type": [
-              "string",
-              "null"
-            ]
-          }
-        },
-        "required": [
-          "code",
-          "title",
-          "uri",
-          "match_score",
-          "rank"
-        ],
-        "type": "object"
-      },
-      "type": "array"
-    }
-  },
-  "required": [
-    "found",
-    "error",
-    "items"
-  ],
-  "type": "object"
-}

changedOutput schema / properties / searched_terminologies / items / enum

Previous value: -[
-  "icd11",
-  "snomed",
-  "loinc",
-  "rxnorm",
-  "mesh"
-]New value: +[
+  "icd11",
+  "loinc",
+  "rxnorm",
+  "mesh"
+]

changedOutput schema / properties / source_terminology / anyOf

Previous value: -[
-  {
-    "enum": [
-      "icd11",
-      "snomed",
-      "loinc",
-      "rxnorm",
-      "mesh"
-    ],
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "icd11",
+      "loinc",
+      "rxnorm",
+      "mesh"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

Changed4 schema fields changedv1.15.0Sep 27, 2026

changedOutput schema / properties / provenance / description

Previous value: -"One provenance block per upstream source that contributed to this response (contract v1.0; licenses are never merged)"New value: +"One provenance block per upstream source that contributed to this response (contract v1.1; licenses are never merged; each block carries the origin diagnostics of ITS source)"

addedOutput schema / properties / provenance / items / description

Added value: +"Bloco de proveniência (contrato v1.1): fonte, URL, competência, extração, diagnóstico de origem, citação e licença"

addedOutput schema / properties / provenance / items / 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 / items / required

Previous value: -[
-  "source",
-  "source_url",
-  "data_vintage",
-  "retrieved_at",
-  "citation",
-  "license"
-]New value: +[
+  "source",
+  "source_url",
+  "data_vintage",
+  "retrieved_at",
+  "retrieval",
+  "citation",
+  "license"
+]

Changed1 schema field changedv1.11.0Sep 15, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
Changed24 schema fields changedv1.9.1Sep 1, 2026
- removedOutput schema / properties / provenance / items / properties / data_vintage / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / provenance / items / properties / data_vintage / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / provenance / items / properties / license / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / provenance / items / properties / license / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / icd11 / properties / error / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / icd11 / properties / error / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / icd11 / properties / items / items / properties / uri / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / icd11 / properties / items / items / properties / uri / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / loinc / properties / error / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / loinc / properties / error / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / loinc / properties / items / items / properties / uri / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / loinc / properties / items / items / properties / uri / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / mesh / properties / error / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / mesh / properties / error / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / mesh / properties / items / items / properties / uri / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / mesh / properties / items / items / properties / uri / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / rxnorm / properties / error / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / rxnorm / properties / error / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / rxnorm / properties / items / items / properties / uri / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / rxnorm / properties / items / items / properties / uri / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / snomed / properties / error / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / snomed / properties / error / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / results / properties / snomed / properties / items / items / properties / uri / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / results / properties / snomed / properties / items / items / properties / uri / type
```
Added value: +[
+  "string",
+  "null"
+]
```

Changed26 schema fields changedv1.8.0Aug 10, 2026

addedInput schema / properties / limit

Added value: +{
+  "description": "Maximum candidates returned PER terminology (1-10, default 5). This is a cap, not a page: the live fan-out has no stable cursor across five upstreams, so raise the limit instead of paging.",
+  "maximum": 10,
+  "minimum": 1,
+  "type": "integer"
+}

addedOutput schema / properties / attribution

Added value: +{
+  "description": "Canonical source URLs of this response (attribution list)",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / groups

Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "members": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "code": {
+              "type": "string"
+            },
+            "match_score": {
+              "maximum": 1,
+              "minimum": 0,
+              "type": "number"
+            },
+            "terminology": {
+              "enum": [
+                "icd11",
+                "snomed",
+                "loinc",
+                "rxnorm",
+                "mesh"
+              ],
+              "type": "string"
+            },
+            "title": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "terminology",
+            "code",
+            "title",
+            "match_score"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "normalized_title": {
+        "type": "string"
+      },
+      "terminologies": {
+        "items": {
+          "enum": [
+            "icd11",
+            "snomed",
+            "loinc",
+            "rxnorm",
+            "mesh"
+          ],
+          "type": "string"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "normalized_title",
+      "terminologies",
+      "members"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / provenance

Added value: +{
+  "description": "One provenance block per upstream source that contributed to this response (contract v1.0; licenses are never merged)",
+  "items": {
+    "additionalProperties": false,
+    "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"
+  },
+  "type": "array"
+}

addedOutput schema / properties / ranking

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "method": {
+      "const": "lexical",
+      "type": "string"
+    },
+    "note": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "method",
+    "note"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / results / properties / icd11 / properties / items / items / properties / match_score
```
Added value: +{
+  "maximum": 1,
+  "minimum": 0,
+  "type": "number"
+}
```
addedOutput schema / properties / results / properties / icd11 / properties / items / items / properties / rank
```
Added value: +{
+  "maximum": 9007199254740991,
+  "minimum": 1,
+  "type": "integer"
+}
```

addedOutput schema / properties / results / properties / icd11 / properties / items / items / properties / uri

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

changedOutput schema / properties / results / properties / icd11 / properties / items / items / required

Previous value: -[
-  "code",
-  "title"
-]New value: +[
+  "code",
+  "title",
+  "uri",
+  "match_score",
+  "rank"
+]

addedOutput schema / properties / results / properties / loinc / properties / items / items / properties / match_score
```
Added value: +{
+  "maximum": 1,
+  "minimum": 0,
+  "type": "number"
+}
```
addedOutput schema / properties / results / properties / loinc / properties / items / items / properties / rank
```
Added value: +{
+  "maximum": 9007199254740991,
+  "minimum": 1,
+  "type": "integer"
+}
```

addedOutput schema / properties / results / properties / loinc / properties / items / items / properties / uri

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

changedOutput schema / properties / results / properties / loinc / properties / items / items / required

Previous value: -[
-  "code",
-  "title"
-]New value: +[
+  "code",
+  "title",
+  "uri",
+  "match_score",
+  "rank"
+]

addedOutput schema / properties / results / properties / mesh / properties / items / items / properties / match_score
```
Added value: +{
+  "maximum": 1,
+  "minimum": 0,
+  "type": "number"
+}
```
addedOutput schema / properties / results / properties / mesh / properties / items / items / properties / rank
```
Added value: +{
+  "maximum": 9007199254740991,
+  "minimum": 1,
+  "type": "integer"
+}
```

addedOutput schema / properties / results / properties / mesh / properties / items / items / properties / uri

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

changedOutput schema / properties / results / properties / mesh / properties / items / items / required

Previous value: -[
-  "code",
-  "title"
-]New value: +[
+  "code",
+  "title",
+  "uri",
+  "match_score",
+  "rank"
+]

addedOutput schema / properties / results / properties / rxnorm / properties / items / items / properties / match_score
```
Added value: +{
+  "maximum": 1,
+  "minimum": 0,
+  "type": "number"
+}
```
addedOutput schema / properties / results / properties / rxnorm / properties / items / items / properties / rank
```
Added value: +{
+  "maximum": 9007199254740991,
+  "minimum": 1,
+  "type": "integer"
+}
```

addedOutput schema / properties / results / properties / rxnorm / properties / items / items / properties / uri

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

changedOutput schema / properties / results / properties / rxnorm / properties / items / items / required

Previous value: -[
-  "code",
-  "title"
-]New value: +[
+  "code",
+  "title",
+  "uri",
+  "match_score",
+  "rank"
+]

addedOutput schema / properties / results / properties / snomed / properties / items / items / properties / match_score
```
Added value: +{
+  "maximum": 1,
+  "minimum": 0,
+  "type": "number"
+}
```
addedOutput schema / properties / results / properties / snomed / properties / items / items / properties / rank
```
Added value: +{
+  "maximum": 9007199254740991,
+  "minimum": 1,
+  "type": "integer"
+}
```

addedOutput schema / properties / results / properties / snomed / properties / items / items / properties / uri

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}

changedOutput schema / properties / results / properties / snomed / properties / items / items / required

Previous value: -[
-  "code",
-  "title"
-]New value: +[
+  "code",
+  "title",
+  "uri",
+  "match_score",
+  "rank"
+]

changedOutput schema / required

Previous value: -[
-  "term",
-  "source_terminology",
-  "searched_terminologies",
-  "results"
-]New value: +[
+  "term",
+  "source_terminology",
+  "searched_terminologies",
+  "results",
+  "groups",
+  "ranking",
+  "provenance",
+  "attribution"
+]

Changed11 schema fields changedv1.5.7Jun 21, 2026
- removedInput schema / additionalProperties
```
Removed value: -false
```
- addedOutput schema / properties / results / properties / icd11 / properties / error / anyOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / results / properties / icd11 / properties / error / type
```
Removed value: -[
-  "string",
-  "null"
-]
```
- addedOutput schema / properties / results / properties / loinc / properties / error / anyOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / results / properties / loinc / properties / error / type
```
Removed value: -[
-  "string",
-  "null"
-]
```
- addedOutput schema / properties / results / properties / mesh / properties / error / anyOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / results / properties / mesh / properties / error / type
```
Removed value: -[
-  "string",
-  "null"
-]
```
- addedOutput schema / properties / results / properties / rxnorm / properties / error / anyOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / results / properties / rxnorm / properties / error / type
```
Removed value: -[
-  "string",
-  "null"
-]
```
- addedOutput schema / properties / results / properties / snomed / properties / error / anyOf
```
Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
```
- removedOutput schema / properties / results / properties / snomed / properties / error / type
```
Removed value: -[
-  "string",
-  "null"
-]
```
First observedv1.2.1May 11, 2026

TDQS

A4.9/5.0

Behavior5/5

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

Annotations already cover the safety profile (readOnly, idempotent, openWorld, non-destructive), yet the description adds substantial context: limit is a cap not a page, match_score/rank are server-computed, groups clustering is a same-concept signal and its absence is NOT proof of non-equivalence, and searches are English-only.

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

Conciseness5/5

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

Front-loaded with purpose, then a bulleted use-case list, then scope/parameter behavior, then language guidance. Dense but every sentence carries actionable information and it is easy to skim.

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

Completeness5/5

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

An output schema exists so return formats needn't be spelled out, yet the description still explains the key output fields (match_score, rank, groups). For a 4-param cross-terminology fan-out tool, nothing an agent needs to call it correctly is missing.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3, but the description consolidates the interaction rule ('source is subtracted from targets') and the limit cap semantics in prose, aiding correct invocation. It largely mirrors the schema wording rather than adding syntax beyond it, so it stays below 5.

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

Purpose5/5

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

States a specific verb (find/rank) and resource (equivalent terms across medical terminologies) with explicit scope (ICD-11, LOINC, RxNorm, MeSH). It implicitly separates itself from single-terminology siblings like icd11_search, loinc_search and rxnorm_search, and explicitly routes pt-BR needs to icd11_search/mesh_search/cid10_search.

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

Usage Guidelines5/5

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

Provides a 'Use this tool to' list of concrete scenarios (find same concept in other systems, compare representations, support mapping/integration). It also gives explicit exclusions and alternatives: set target_terminologies to narrow, source_terminology to exclude, and use dedicated tools for pt-BR.

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