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Cherami

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Reply to all

reply_all_message
Destructive

Reply to everyone visible on a message except this inbox; original Bcc recipients are never included. Derived recipients come from sender-written headers: check them against the assignment. To choose recipients yourself, use send_message with in_reply_to.

Input Schema

NameRequiredDescriptionDefault
htmlNoOptional HTML alternative to your response.
textYesYour response; original history is not automatically quoted.
labelsNo
inbox_idYesInbox to send from; it must hold the source message.
message_idYesReady received or accepted sent message in this inbox. A reply to received mail goes to its Reply-To, or From when there is none; a reply to sent mail goes to its original To. Reply-all adds the visible To and Cc.
attachmentsNoNew files for this reply; original attachments are not copied.
idempotency_keyNoMakes a retry safe: repeating the call with the same key and identical arguments within 24 hours of the first request returns the original attempt instead of sending again. Use a new key for each intended email.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changed
    • changedInput schema / properties / idempotency_key / description
      Previous value: -"Use a unique key per intended email. Retain the key, exact payload and first request time; reuse only for that attempt within 24 hours, even if the source is later deleted."New value: +"Makes a retry safe: repeating the call with the same key and identical arguments within 24 hours of the first request returns the original attempt instead of sending again. Use a new key for each intended email."
    • changedInput schema / properties / inbox_id / description
      Previous value: -"Sending inbox; must own the source message."New value: +"Inbox to send from; it must hold the source message."
    • changedInput schema / properties / message_id / description
      Previous value: -"Ready received or accepted sent message in this inbox. Received replies use Reply-To, otherwise From; sent replies use original To. Reply-all also includes visible To/Cc."New value: +"Ready received or accepted sent message in this inbox. A reply to received mail goes to its Reply-To, or From when there is none; a reply to sent mail goes to its original To. Reply-all adds the visible To and Cc."
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "idempotency_expires_at": {
-        "description": "End of retry-key protection. Retrying an uncertain send after this instant can send it again.",
-        "type": "string"
-      },
-      "limited": {
-        "const": false,
-        "type": "boolean"
-      },
-      "message": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "const": "accepted",
-                "description": "Accepted by the email provider, not confirmation of delivery.",
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "guidance": {
-                "type": "string"
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "enum": [
-                  "rejected",
-                  "unknown"
-                ],
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status",
-              "guidance"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "outcome_persisted": {
-        "const": true,
-        "type": "boolean"
-      },
-      "replayed": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "limited",
-      "message",
-      "outcome_persisted"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "guidance": {
-        "type": "string"
-      },
-      "idempotency_expires_at": {
-        "description": "End of retry-key protection. Retrying an uncertain send after this instant can send it again.",
-        "type": "string"
-      },
-      "limited": {
-        "const": false,
-        "type": "boolean"
-      },
-      "message": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "const": "accepted",
-                "description": "Accepted by the email provider, not confirmation of delivery.",
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "guidance": {
-                "type": "string"
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "enum": [
-                  "rejected",
-                  "unknown"
-                ],
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status",
-              "guidance"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "outcome_persisted": {
-        "const": false,
-        "type": "boolean"
-      },
-      "replayed": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "limited",
-      "message",
-      "outcome_persisted",
-      "guidance"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "idempotency_expires_at": {
+        "description": "Until this time, a retry with the same idempotency_key returns this send; after it, the same key sends again.",
+        "type": "string"
+      },
+      "limited": {
+        "const": false,
+        "type": "boolean"
+      },
+      "message": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "const": "accepted",
+                "description": "Accepted by the email provider, not confirmation of delivery.",
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "guidance": {
+                "type": "string"
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "enum": [
+                  "rejected",
+                  "unknown"
+                ],
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status",
+              "guidance"
+            ],
+            "type": "object"
+          }
+        ],
+        "description": "The saved send. Check status: a successful call can still return rejected or unknown."
+      },
+      "outcome_persisted": {
+        "const": true,
+        "type": "boolean"
+      },
+      "replayed": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "limited",
+      "message",
+      "outcome_persisted"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "guidance": {
+        "type": "string"
+      },
+      "idempotency_expires_at": {
+        "description": "Until this time, a retry with the same idempotency_key returns this send; after it, the same key sends again.",
+        "type": "string"
+      },
+      "limited": {
+        "const": false,
+        "type": "boolean"
+      },
+      "message": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "const": "accepted",
+                "description": "Accepted by the email provider, not confirmation of delivery.",
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "guidance": {
+                "type": "string"
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "enum": [
+                  "rejected",
+                  "unknown"
+                ],
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status",
+              "guidance"
+            ],
+            "type": "object"
+          }
+        ],
+        "description": "The saved send. Check status: a successful call can still return rejected or unknown."
+      },
+      "outcome_persisted": {
+        "const": false,
+        "type": "boolean"
+      },
+      "replayed": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "limited",
+      "message",
+      "outcome_persisted",
+      "guidance"
+    ],
+    "type": "object"
+  }
+]
  2. First observed

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already declare destructive and non-idempotent behavior, so the bar is lower. The description adds important behavioral context not in annotations: original Bcc recipients are never included, and recipients are derived from sender-written headers rather than freely chosen.

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?

Three tightly written sentences with the main behavior front-loaded. Every clause earns its place by clarifying recipient scope, derivation, or the alternative tool.

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?

Given the annotations, rich schema, and output schema, the description is largely complete for this mutation tool. It covers recipient derivation and the send_message alternative, though the phrase 'check them against the assignment' introduces minor ambiguity about an external context.

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 description coverage is high at 86%, so the baseline is 3. The description adds some recipient-derivation meaning around message_id and inbox_id, but it does not supplement the remaining parameters such as labels, attachments, or idempotency_key.

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 and resource: replying to everyone visible on a message, with the inbox excluded and Bcc recipients explicitly omitted. The scope is precise enough that an agent can distinguish it from a simple reply.

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?

Explicitly names the alternative for manual recipient selection: use send_message with in_reply_to. It also frames the default behavior as deriving recipients from sender-written headers, so the when-to-use condition is clear.

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

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