truncus_send_email

Send a transactional email to a single recipient. Requires a verified sending domain.

Accepts raw HTML/template content (html); Single-target operation

Part of the Truncus MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents use truncus_send_email to create or modify resources in Truncus. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

// WHY ENFORCE A POLICY ON TRUNCUS_SEND_EMAIL

Without a policy, an AI agent could call truncus_send_email repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Truncus.

// RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

co-truncus-mcp-server.yaml

tools:
  truncus_send_email:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Truncus policy for all 6 tools.

// DETAILS

Tool Name truncus_send_email

Category Write

MCP Server Truncus MCP Server

Risk Level Medium

// MORE TRUNCUS TOOLS

Read truncus_check_suppression Read truncus_get_email Read truncus_get_stats Read truncus_list_domains Read truncus_validate_email

// WHAT CAN GO WRONG

Agents calling write-class tools like truncus_send_email have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update AbraFlexi invoice_received_create

// RELATED READING

// FAQ

What does the truncus_send_email tool do? +

Send a transactional email to a single recipient. Requires a verified sending domain.. It is categorised as a Write tool in the Truncus MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on truncus_send_email? +

Add a rule in your Intercept YAML policy under the tools section for truncus_send_email. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Truncus MCP server.

What risk level is truncus_send_email? +

truncus_send_email is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit truncus_send_email? +

Yes. Add a rate_limit block to the truncus_send_email rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block truncus_send_email completely? +

Set action: deny in the Intercept policy for truncus_send_email. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides truncus_send_email? +

truncus_send_email is provided by the Truncus MCP server (@truncus/mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

truncus_send_email

Let agents act without letting them run wild.