mailmcp

Search messages

search_messages

Read-onlyIdempotent

Searches one account, or all with account="all". Gmail: query takes Gmail syntax (from:, newer_than:7d, has:attachment, label:); elsewhere full text plus the filters. Newest first, with uid + folder and header hints. Outlook: total counts returned results only; from is exact.

Input Schema

TableJSON Schema

Name	Required	Description
`to`	No
`from`	No
`limit`	No	Default 20, max 50
`query`	No	Gmail syntax on Gmail, else plain text
`since`	No	ISO date, e.g. 2026-09-01
`before`	No	ISO date
`folder`	No	Default: Gmail All Mail, else INBOX
`offset`	No	Hits to skip (keep small)
`unseen`	No	Only unread
`account`	Yes	"all", or a list_accounts id
`flagged`	No	Only starred/flagged
`subject`	No
`has_attachment`	No

Output Schema

TableJSON Schema

Name	Required	Description	Default
`count`	Yes
`messages`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 5, 2026

changedInput schema / properties / account / description

Previous value: -"Account id, or \"all\" to search every readable account"New value: +"\"all\", or a list_accounts id"

changedInput schema / properties / folder / description

Previous value: -"Folder/label path. Defaults to All Mail on Gmail, INBOX elsewhere."New value: +"Default: Gmail All Mail, else INBOX"

changedInput schema / properties / offset / description

Previous value: -"Skip this many hits; the window Graph and IMAP fetch grows with it, so keep it small"New value: +"Hits to skip (keep small)"

changedInput schema / properties / query / description

Previous value: -"Gmail search syntax on Gmail; plain text elsewhere"New value: +"Gmail syntax on Gmail, else plain text"

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": {},
+  "properties": {
+    "count": {
+      "type": "number"
+    },
+    "messages": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "folder": {
+            "type": "string"
+          },
+          "uid": {
+            "type": [
+              "string",
+              "number"
+            ]
+          }
+        },
+        "required": [
+          "uid",
+          "folder"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "count",
+    "messages"
+  ],
+  "type": "object"
+}

Changed2 schema fields changedSep 22, 2026

addedInput schema / properties / offset / description

Added value: +"Skip this many hits; the window Graph and IMAP fetch grows with it, so keep it small"

changedInput schema / properties / offset / maximum

Previous value: -9007199254740991New value: +5000

First observedSep 16, 2026

TDQS

A3.8/5.0

Behavior4/5

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

Annotations already cover read-only/idempotent/non-destructive safety, and the description adds real behavioral value: result ordering ('newest first'), Backend-specific quirks ('Outlook: total counts returned results only; from is exact'), and Gmail query support. It does not disclose pagination interaction with offset/limit beyond what schema states.

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?

Information-dense and front-loaded, with the account scope leading. The backtick-laden, semicolon-joined style is telegraphic, and the 'uid + folder and header hints' clause slightly duplicates the output schema, but no sentence is wasted.

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?

An output schema exists, so return values needn't be detailed, and the description correctly focuses on the ambiguous parts (account scoping, per-backend query semantics). For a 13-parameter search tool it is largely complete, though it omits guidance on combining filters.

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 69%, and the description adds genuine meaning: `query` semantics differ per backend (Gmail syntax vs. full text), `account="all"` is explained, and Outlook `from`/`total` behavior is clarified. It leaves less-obvious params like `offset` interplay with `limit` unaddressed.

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 clear verb+resource ('Searches' messages) and immediately scopes it ('one account, or all with account="all"'). It never names the sibling 'search' or explains how it differs from get_message/fetch, so it falls short of full sibling differentiation.

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

Usage Guidelines3/5

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

Usage is implied through the account and query scoping, and it explains Gmail vs. non-Gmail query behavior, but there is no explicit when-to-use vs. when-not, nor any named alternative (search, fetch, triage) to route the agent.

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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