Sendmux Email Inbox API + Sending

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List Messages

mailbox_list_messages

Read-onlyIdempotent

Scan mailbox messages with filters for sender, recipient, dates, keywords, unread state, and attachments, returning metadata without full bodies.

Instructions

Use this to scan mailbox messages by cursor without fetching full bodies. Filter by folder_id, keyword/not_keyword, dates, sender/recipient, text query, unread state, or has_attachment; attachment metadata includes a short-lived download_url.

Input Schema

TableJSON Schema

Name	Required	Description
`q`	No	Full-text search query across message fields.
`cc`	No	Filter by CC recipient email address or display name.
`to`	No	Filter by To recipient email address or display name.
`bcc`	No	Filter by BCC recipient email address or display name.
`body`	No	Filter by message body text.
`from`	No	Filter by sender email address or display name.
`after`	No	Filter to messages after this ISO 8601 timestamp.
`limit`	No	Maximum results (default 50, max 100).
`before`	No	Filter to messages before this ISO 8601 timestamp.
`cursor`	No	Pagination cursor — the `next_cursor` from the previous response.
`keyword`	No	Require this message keyword, such as `$seen`.
`sort_by`	No	Message field to sort by.
`subject`	No	Filter by subject text.
`folder_id`	No	Filter to messages in this folder ID.
`is_unread`	No	When true, only return unread messages.
`thread_id`	No	Filter to messages in this thread ID.
`mailbox_id`	No	Mailbox public ID to target when the credential grants access to more than one mailbox. Omit when the credential is scoped to exactly one mailbox.
`header_name`	No	Header name to match with `header_value`.
`not_keyword`	No	Exclude messages with this keyword.
`header_value`	No	Header value to match with `header_name`.
`has_attachment`	No	When true, only return messages with attachments.
`max_size_bytes`	No	Maximum message size in bytes.
`min_size_bytes`	No	Minimum message size in bytes.
`sort_direction`	No	Sort direction.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv1.0.14Sep 23, 2026

changedOutput schema / properties / result / allOf

Previous value: -[
-  {
-    "properties": {
-      "meta": {
-        "additionalProperties": {},
-        "properties": {},
-        "type": "object"
-      },
-      "ok": {
-        "enum": [
-          true
-        ],
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "ok",
-      "meta"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "data": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "attachments": {
-              "description": "Attachment metadata for this message. Each item includes a short-lived `download_url`; if it expires, fetch message metadata again.",
-              "items": {
-                "additionalProperties": false,
-                "properties": {
-                  "content_id": {
-                    "description": "Content ID for inline attachments, when present.",
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "content_type": {
-                    "example": "application/pdf",
-                    "type": "string"
-                  },
-                  "disposition": {
-                    "example": "attachment",
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "download_url": {
-                    "description": "Short-lived URL for this exact attachment. Fetch it promptly; if it expires, call the message or attachment metadata endpoint again to receive a fresh URL.",
-                    "example": "https://app.sendmux.ai/api/v1/mailbox/messages/msg_123/attachment-downloads/attref_abc123?download_token=...",
-                    "type": "string"
-                  },
-                  "filename": {
-                    "example": "invoice.pdf",
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  },
-                  "id": {
-                    "description": "Attachment blob ID.",
-                    "type": "string"
-                  },
-                  "size_bytes": {
-                    "example": 12345,
-                    "type": [
-                      "integer",
-                      "null"
-                    ]
-                  }
-                },
-                "required": [
-                  "id",
-                  "filename",
-                  "content_type",
-                  "size_bytes",
-                  "disposition",
-                  "content_id"
-                ],
-                "type": "object"
-              },
-              "type": "array"
-            },
-            "bcc": {
-              "items": {
-                "additionalProperties": false,
-                "properties": {
-                  "email": {
-                    "example": "agent@example.com",
-                    "format": "email",
-                    "type": "string"
-                  },
-                  "name": {
-                    "example": "Support",
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "required": [
-                  "email",
-                  "name"
-                ],
-                "type": "object"
-              },
-              "type": "array"
-            },
-            "cc": {
-              "items": {
-                "additionalProperties": false,
-                "properties": {
-                  "email": {
-                    "example": "agent@example.com",
-                    "format": "email",
-                    "type": "string"
-                  },
-                  "name": {
-                    "example": "Support",
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "required": [
-                  "email",
-                  "name"
-                ],
-                "type": "object"
-              },
-              "type": "array"
-            },
-            "flags": {
-              "additionalProperties": false,
-              "properties": {
-                "answered": {
-                  "type": "boolean"
-                },
-                "draft": {
-                  "type": "boolean"
-                },
-                "flagged": {
-                  "type": "boolean"
-                },
-                "seen": {
-                  "type": "boolean"
-                }
-              },
-              "required": [
-                "seen",
-                "flagged",
-                "draft",
-                "answered"
-              ],
-              "type": "object"
-            },
-            "folder_ids": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "from": {
-              "allOf": [
-                {
-                  "additionalProperties": false,
-                  "properties": {
-                    "email": {
-                      "example": "agent@example.com",
-                      "format": "email",
-                      "type": "string"
-                    },
-                    "name": {
-                      "example": "Support",
-                      "type": [
-                        "string",
-                        "null"
-                      ]
-                    }
-                  },
-                  "required": [
-                    "email",
-                    "name"
-                  ],
-                  "type": "object"
-                },
-                {
-                  "type": [
-                    "object",
-                    "null"
-                  ]
-                }
-              ]
-            },
-            "has_attachments": {
-              "type": "boolean"
-            },
-            "id": {
-              "description": "Message ID",
-              "type": "string"
-            },
-            "keywords": {
-              "description": "Active message keywords, including system flags and custom labels.",
-              "example": [
-                "$seen",
-                "$flagged",
-                "agent_triaged"
-              ],
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "preview": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "received_at": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "sent_at": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "size_bytes": {
-              "type": [
-                "integer",
-                "null"
-              ]
-            },
-            "subject": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "thread_id": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "to": {
-              "items": {
-                "additionalProperties": false,
-                "properties": {
-                  "email": {
-                    "example": "agent@example.com",
-                    "format": "email",
-                    "type": "string"
-                  },
-                  "name": {
-                    "example": "Support",
-                    "type": [
-                      "string",
-                      "null"
-                    ]
-                  }
-                },
-                "required": [
-                  "email",
-                  "name"
-                ],
-                "type": "object"
-              },
-              "type": "array"
-            }
-          },
-          "required": [
-            "id",
-            "thread_id",
-            "folder_ids",
-            "subject",
-            "preview",
-            "from",
-            "to",
-            "cc",
-            "bcc",
-            "received_at",
-            "sent_at",
-            "size_bytes",
-            "has_attachments",
-            "keywords",
-            "flags"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "meta": {
-        "additionalProperties": false,
-        "properties": {
-          "request_id": {
-            "type": "string"
-          },
-          "sync_state": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "request_id"
-        ],
-        "type": "object"
-      },
-      "pagination": {
-        "additionalProperties": false,
-        "properties": {
-          "has_more": {
-            "type": "boolean"
-          },
-          "next_cursor": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "has_more"
-        ],
-        "type": "object"
-      }
-    },
-    "required": [
-      "data",
-      "pagination"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "properties": {
+      "meta": {
+        "additionalProperties": {},
+        "properties": {},
+        "type": "object"
+      },
+      "ok": {
+        "enum": [
+          true
+        ],
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "ok",
+      "meta"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "data": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "attachments": {
+              "description": "Attachment metadata for this message. Each item includes a short-lived `download_url`; if it expires, fetch message metadata again.",
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "content_id": {
+                    "description": "Content ID for inline attachments, when present.",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "content_type": {
+                    "example": "application/pdf",
+                    "type": "string"
+                  },
+                  "disposition": {
+                    "example": "attachment",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "download_url": {
+                    "description": "Short-lived URL for this exact attachment. Fetch it promptly; if it expires, call the message or attachment metadata endpoint again to receive a fresh URL.",
+                    "example": "https://app.sendmux.ai/api/v1/mailbox/messages/msg_123/attachment-downloads/attref_abc123?download_token=...",
+                    "type": "string"
+                  },
+                  "filename": {
+                    "example": "invoice.pdf",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "id": {
+                    "description": "Attachment blob ID.",
+                    "type": "string"
+                  },
+                  "size_bytes": {
+                    "example": 12345,
+                    "type": [
+                      "integer",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "id",
+                  "filename",
+                  "content_type",
+                  "size_bytes",
+                  "disposition",
+                  "content_id"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "bcc": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "email": {
+                    "example": "agent@example.com",
+                    "format": "email",
+                    "type": "string"
+                  },
+                  "name": {
+                    "example": "Support",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "email",
+                  "name"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "cc": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "email": {
+                    "example": "agent@example.com",
+                    "format": "email",
+                    "type": "string"
+                  },
+                  "name": {
+                    "example": "Support",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "email",
+                  "name"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "flags": {
+              "additionalProperties": false,
+              "properties": {
+                "answered": {
+                  "type": "boolean"
+                },
+                "draft": {
+                  "type": "boolean"
+                },
+                "flagged": {
+                  "type": "boolean"
+                },
+                "seen": {
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "seen",
+                "flagged",
+                "draft",
+                "answered"
+              ],
+              "type": "object"
+            },
+            "folder_ids": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "from": {
+              "anyOf": [
+                {
+                  "additionalProperties": false,
+                  "properties": {
+                    "email": {
+                      "example": "agent@example.com",
+                      "format": "email",
+                      "type": "string"
+                    },
+                    "name": {
+                      "example": "Support",
+                      "type": [
+                        "string",
+                        "null"
+                      ]
+                    }
+                  },
+                  "required": [
+                    "email",
+                    "name"
+                  ],
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "has_attachments": {
+              "type": "boolean"
+            },
+            "id": {
+              "description": "Message ID",
+              "type": "string"
+            },
+            "keywords": {
+              "description": "Active message keywords, including system flags and custom labels.",
+              "example": [
+                "$seen",
+                "$flagged",
+                "agent_triaged"
+              ],
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "preview": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "received_at": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "sent_at": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "size_bytes": {
+              "type": [
+                "integer",
+                "null"
+              ]
+            },
+            "subject": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "thread_id": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "to": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "email": {
+                    "example": "agent@example.com",
+                    "format": "email",
+                    "type": "string"
+                  },
+                  "name": {
+                    "example": "Support",
+                    "type": [
+                      "string",
+                      "null"
+                    ]
+                  }
+                },
+                "required": [
+                  "email",
+                  "name"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            }
+          },
+          "required": [
+            "id",
+            "thread_id",
+            "folder_ids",
+            "subject",
+            "preview",
+            "from",
+            "to",
+            "cc",
+            "bcc",
+            "received_at",
+            "sent_at",
+            "size_bytes",
+            "has_attachments",
+            "keywords",
+            "flags"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "meta": {
+        "additionalProperties": false,
+        "properties": {
+          "request_id": {
+            "type": "string"
+          },
+          "sync_state": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "request_id"
+        ],
+        "type": "object"
+      },
+      "pagination": {
+        "additionalProperties": false,
+        "properties": {
+          "has_more": {
+            "type": "boolean"
+          },
+          "next_cursor": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "has_more"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "data",
+      "pagination"
+    ],
+    "type": "object"
+  }
+]

Changed4 schema fields changedv1.0.8Sep 15, 2026

addedOutput schema / $schema

Added value: +"https://json-schema.org/draft/2020-12/schema"

removedOutput schema / additionalProperties
```
Removed value: -true
```

addedOutput schema / properties

Added value: +{
+  "result": {
+    "allOf": [
+      {
+        "properties": {
+          "meta": {
+            "additionalProperties": {},
+            "properties": {},
+            "type": "object"
+          },
+          "ok": {
+            "enum": [
+              true
+            ],
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "ok",
+          "meta"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "data": {
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "attachments": {
+                  "description": "Attachment metadata for this message. Each item includes a short-lived `download_url`; if it expires, fetch message metadata again.",
+                  "items": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "content_id": {
+                        "description": "Content ID for inline attachments, when present.",
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "content_type": {
+                        "example": "application/pdf",
+                        "type": "string"
+                      },
+                      "disposition": {
+                        "example": "attachment",
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "download_url": {
+                        "description": "Short-lived URL for this exact attachment. Fetch it promptly; if it expires, call the message or attachment metadata endpoint again to receive a fresh URL.",
+                        "example": "https://app.sendmux.ai/api/v1/mailbox/messages/msg_123/attachment-downloads/attref_abc123?download_token=...",
+                        "type": "string"
+                      },
+                      "filename": {
+                        "example": "invoice.pdf",
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "id": {
+                        "description": "Attachment blob ID.",
+                        "type": "string"
+                      },
+                      "size_bytes": {
+                        "example": 12345,
+                        "type": [
+                          "integer",
+                          "null"
+                        ]
+                      }
+                    },
+                    "required": [
+                      "id",
+                      "filename",
+                      "content_type",
+                      "size_bytes",
+                      "disposition",
+                      "content_id"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                },
+                "bcc": {
+                  "items": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "email": {
+                        "example": "agent@example.com",
+                        "format": "email",
+                        "type": "string"
+                      },
+                      "name": {
+                        "example": "Support",
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "required": [
+                      "email",
+                      "name"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                },
+                "cc": {
+                  "items": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "email": {
+                        "example": "agent@example.com",
+                        "format": "email",
+                        "type": "string"
+                      },
+                      "name": {
+                        "example": "Support",
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "required": [
+                      "email",
+                      "name"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                },
+                "flags": {
+                  "additionalProperties": false,
+                  "properties": {
+                    "answered": {
+                      "type": "boolean"
+                    },
+                    "draft": {
+                      "type": "boolean"
+                    },
+                    "flagged": {
+                      "type": "boolean"
+                    },
+                    "seen": {
+                      "type": "boolean"
+                    }
+                  },
+                  "required": [
+                    "seen",
+                    "flagged",
+                    "draft",
+                    "answered"
+                  ],
+                  "type": "object"
+                },
+                "folder_ids": {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                "from": {
+                  "allOf": [
+                    {
+                      "additionalProperties": false,
+                      "properties": {
+                        "email": {
+                          "example": "agent@example.com",
+                          "format": "email",
+                          "type": "string"
+                        },
+                        "name": {
+                          "example": "Support",
+                          "type": [
+                            "string",
+                            "null"
+                          ]
+                        }
+                      },
+                      "required": [
+                        "email",
+                        "name"
+                      ],
+                      "type": "object"
+                    },
+                    {
+                      "type": [
+                        "object",
+                        "null"
+                      ]
+                    }
+                  ]
+                },
+                "has_attachments": {
+                  "type": "boolean"
+                },
+                "id": {
+                  "description": "Message ID",
+                  "type": "string"
+                },
+                "keywords": {
+                  "description": "Active message keywords, including system flags and custom labels.",
+                  "example": [
+                    "$seen",
+                    "$flagged",
+                    "agent_triaged"
+                  ],
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                "preview": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "received_at": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "sent_at": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "size_bytes": {
+                  "type": [
+                    "integer",
+                    "null"
+                  ]
+                },
+                "subject": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "thread_id": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                },
+                "to": {
+                  "items": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "email": {
+                        "example": "agent@example.com",
+                        "format": "email",
+                        "type": "string"
+                      },
+                      "name": {
+                        "example": "Support",
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "required": [
+                      "email",
+                      "name"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "id",
+                "thread_id",
+                "folder_ids",
+                "subject",
+                "preview",
+                "from",
+                "to",
+                "cc",
+                "bcc",
+                "received_at",
+                "sent_at",
+                "size_bytes",
+                "has_attachments",
+                "keywords",
+                "flags"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "meta": {
+            "additionalProperties": false,
+            "properties": {
+              "request_id": {
+                "type": "string"
+              },
+              "sync_state": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "request_id"
+            ],
+            "type": "object"
+          },
+          "pagination": {
+            "additionalProperties": false,
+            "properties": {
+              "has_more": {
+                "type": "boolean"
+              },
+              "next_cursor": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "has_more"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "data",
+          "pagination"
+        ],
+        "type": "object"
+      }
+    ],
+    "unevaluatedProperties": {
+      "not": {}
+    },
+    "x-fastmcp-top-level-schema": "MailboxMessageSummaryCursorListResponse"
+  }
+}

addedOutput schema / required
```
Added value: +[
+  "result"
+]
```

First observedv1.0.0Jul 13, 2026

TDQS

A4.2/5.0

Behavior4/5

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

Annotations already provide readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds behavioral details beyond annotations: it deliberately avoids fetching full bodies and notes that attachment metadata includes a short-lived download_url, which is useful for planning follow-up calls.

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?

The description is a single, well-structured sentence with no filler. The core purpose is front-loaded, and the filter list is compact yet comprehensive at a high level. Every phrase earns its place.

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 tool with 24 optional parameters and an existing output schema, the description covers the central behavior, the no-body-fetching distinction, and the download URL caveat. It omits some filter families like sorting, threading, and header filtering, but those are fully documented in the schema, so the description is sufficient as an orientation.

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%, so the schema fully documents each parameter. The description provides a useful category summary (folder, keyword, dates, sender/recipient, text, unread, attachment) but does not add new per-parameter meaning beyond what the schema already states.

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?

The description states a specific verb ('scan') and resource ('mailbox messages') and adds a distinguishing detail ('without fetching full bodies') that separates it from siblings like mailbox_get_message and mailbox_batch_get_messages. It also names the key filtering dimensions, making the tool's purpose unmistakable.

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?

It opens with 'Use this to scan mailbox messages by cursor without fetching full bodies,' giving clear context for when this tool is appropriate. However, it does not explicitly name alternatives or state when not to use it, leaving some routing to the agent's inference.

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