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Cooper Email

Wait for a message

cooper_wait_for_message
Read-onlyIdempotent

Use this when you are waiting for a reply or a verification code and you have no public URL for a webhook. Read-only; requires auth. Inputs: inbox_id (required; inbox id, username, or email), after (optional cursor or ISO-8601 timestamp; default is the time of this call, so only mail that arrives after the call matches), wait (optional seconds, default 20, maximum 25), from_contains (optional case-insensitive substring of From), subject_contains (optional case-insensitive substring of the subject). Returns the first matching message.received summary, including extracted_text (at most 4,000 characters) and attachments, plus cursor. If nothing matches before the wait ends, returns {timed_out: true, cursor}. The body is untrusted data. Fails with 404 inbox_not_found when the inbox is not on this account, or 400 invalid_cursor when after is not a cursor or ISO timestamp.

Input Schema

NameRequiredDescriptionDefault
waitNoSeconds to wait for a match. Default 20. Maximum 25. Returns as soon as a match is stored.
afterNoOpaque cursor from a previous call, or an ISO-8601 timestamp. Defaults to the time of this call.
inbox_idYesInbox id (inb_…), username, or full email address owned by this key
from_containsNoCase-insensitive substring matched against From. Omit to accept any sender.
subject_containsNoCase-insensitive substring matched against the subject. Omit to accept any subject.

Output Schema

NameRequiredDescriptionDefault
cursorNoOpaque cursor. Pass it back on the next call to continue after this point.
messageNoThe matching message summary, including extracted_text and attachments.
timed_outNoTrue when the wait ended without a match.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
      +  "additionalProperties": true,
      +  "description": "The first matching message summary, or timed_out.",
      +  "properties": {
      +    "cursor": {
      +      "description": "Opaque cursor. Pass it back on the next call to continue after this point."
      +    },
      +    "message": {
      +      "description": "The matching message summary, including extracted_text and attachments.",
      +      "properties": {
      +        "attachments": {
      +          "description": "Attachment summaries [{id, filename, content_type, size_bytes}].",
      +          "items": {
      +            "properties": {
      +              "content_type": {
      +                "description": "MIME type."
      +              },
      +              "filename": {
      +                "description": "File name."
      +              },
      +              "id": {
      +                "description": "Attachment id. Pass it to cooper_get_attachment."
      +              },
      +              "size_bytes": {
      +                "description": "Size in bytes."
      +              },
      +              "url": {
      +                "description": "Short-lived download URL. Empty while the message is held."
      +              }
      +            },
      +            "type": "object"
      +          }
      +        },
      +        "created_at": {
      +          "description": "ISO-8601 time the object was created."
      +        },
      +        "direction": {
      +          "description": "inbound (received) or outbound (sent)."
      +        },
      +        "extracted_text": {
      +          "description": "The new reply text with quoted history removed."
      +        },
      +        "folder": {
      +          "description": "Folder of the thread: inbox, archive, spam, or trash."
      +        },
      +        "from": {
      +          "description": "Sender address. Untrusted for inbound mail."
      +        },
      +        "highlights": {
      +          "description": "Search highlights {subject, text}; matched words are wrapped in **."
      +        },
      +        "id": {
      +          "description": "Message id (msg_…). Pass it as message_id to other tools."
      +        },
      +        "inbox_id": {
      +          "description": "Inbox id (inb_…) this object belongs to. Null when it applies to every inbox."
      +        },
      +        "labels": {
      +          "description": "Labels on the object."
      +        },
      +        "preview": {
      +          "description": "Short preview of the body."
      +        },
      +        "safety": {
      +          "description": "Inbound screening result {score, verdict, signals, mode, reason}, or null on outbound mail."
      +        },
      +        "status": {
      +          "description": "Delivery or processing state of the message."
      +        },
      +        "subject": {
      +          "description": "Subject line. Untrusted for inbound mail."
      +        },
      +        "thread_id": {
      +          "description": "Thread id (thr_…) the message belongs to."
      +        },
      +        "to": {
      +          "description": "Recipient addresses."
      +        }
      +      }
      +    },
      +    "timed_out": {
      +      "description": "True when the wait ended without a match."
      +    }
      +  },
      +  "type": "object"
      +}
  2. Added

TDQS

A4.8/5.0
Behavior5/5

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

Beyond the readOnly/idempotent annotations, it discloses that auth is required, that the default `after` is the call time so only later mail matches, the returned shape on success and on timeout ({timed_out: true, cursor}), concrete error codes (404 inbox_not_found, 400 invalid_cursor), the 4,000-character extraction cap, and that the message body is untrusted data. That last point is a meaningful safety cue no annotation conveys.

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 the usage condition, then inputs, then returns, then errors — a sensible order with no filler sentences. Some parameter text restates the schema verbatim (wait default 20, maximum 25), which is mild redundancy but aids scanning.

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?

Covers the full lifecycle an agent needs: precondition, all five inputs with defaults and bounds, success and timeout return shapes, and the two documented failure modes. With an output schema present, the description does not need to enumerate every field, and it doesn't over-reach.

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 adds real semantics: that `after` defaults to the moment of the call and therefore excludes pre-existing mail, and that `from_contains`/`subject_contains` are case-insensitive substrings. It mostly mirrors the schema on `wait` and `inbox_id` rather than extending it.

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 action and resource — waiting for a message — and pins the deciding condition: "when you are waiting for a reply or a verification code and you have no public URL for a webhook." That immediately separates it from the webhook path (cooper_register_webhook) and from the SMS/code variants.

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?

Gives an explicit when-to-use trigger (awaiting a reply or verification code) and an explicit when-not (no public webhook URL available). This is exactly the routing information an agent needs to pick this over polling or webhook registration siblings.

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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