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Proton Suite Agent

Proton Suite Agent

by Soluciones-Alexendros
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Hybrid

Send an email

proton_send_email

Send an email through Proton Bridge SMTP with text, HTML, attachments, and CC/BCC recipients. Use it to deliver composed messages from your configured Proton Mail address.

Instructions

Sends an email via Proton Bridge SMTP. 'from' is fixed to the configured address. Provide either text, html, or both. Attachments are base64-encoded bytes.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "to": "<to>",
      "subject": "<subject>"
    },
    "name": "proton_send_email"
  }
}

Input Schema

NameRequiredDescriptionDefault
ccNo
toYesRecipient addresses
bccNo
htmlNo
textNo
subjectYes
reply_toNo
attachmentsNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changedv1.7.4
    • changedInput schema / properties / bcc / items / pattern
      Previous value: -"^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"New value: +"^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
    • changedInput schema / properties / cc / items / pattern
      Previous value: -"^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"New value: +"^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
    • changedInput schema / properties / reply_to / pattern
      Previous value: -"^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"New value: +"^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
    • changedInput schema / properties / to / items / pattern
      Previous value: -"^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"New value: +"^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
  2. First observedv0.8.0

TDQS

A3.7/5.0
Behavior4/5

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

Annotations already declare non-readOnly, non-idempotent, open-world; the description adds genuinely new context: the transport (Proton Bridge SMTP), that 'from' is fixed to the configured account (so no sender spoofing possible), and that attachments must be base64. It stops short of noting that sending is irreversible/side-effecting once accepted.

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?

Four short sentences, all load-bearing, with the core action and the fixed-sender constraint front-loaded. No filler or restatement of the title.

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

Completeness3/5

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

With no output schema, the description should indicate what a successful send returns (message id, status) and mention failure modes, which it does not. Combined with the low schema coverage, an agent still lacks full picture for this 8-param mutation tool.

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 only 13% and only 'to' has a description, so the description must compensate. It clarifies text/html optionality and attachment encoding, but says nothing about cc, bcc, reply_to, or subject constraints, leaving several parameters undocumented in both places.

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 specific verb and resource ('Sends an email via Proton Bridge SMTP'), making it clearly the compose/send tool versus siblings like proton_reply_email and proton_forward_email. It does not explicitly name those siblings, but the action is unambiguous.

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?

The description gives conditional body guidance ('Provide either text, html, or both'), which is useful. It never says when to prefer this over proton_reply_email or proton_forward_email, and gives no prerequisites (e.g., Bridge must be running/authenticated), leaving routing to inference.

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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