MCP Tool Reference Medium Risk

update-contact

Update an existing contact

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

resend-mcp Write

WHEN AI AGENTS USE THIS TOOL

AI agents use update-contact to create or modify resources in Resend. 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 UPDATE-CONTACT

Without a policy, an AI agent could call update-contact 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 Resend.

RECOMMENDED POLICY

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

resend.yaml 
tools:
  update-contact:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Resend policy for all 42 tools.

DETAILS

Tool Name

update-contact

Category

Write

MCP Server

Resend MCP Server

Risk Level

Medium

MORE RESEND TOOLS

send-email Write
Send a single transactional email
send-batch-emails Write
Send batch emails to multiple recipients
update-email Write
Update a scheduled email
cancel-email Write
Cancel a scheduled email
create-contact Write
Create a new contact
create-contact-property Write
Create a custom contact property
update-contact-property Write
Update a custom contact property
create-broadcast Write
Create a new broadcast campaign

View all 42 tools →

SIMILAR WRITE TOOLS ON OTHER SERVERS

create_table Airtable
Create a new table with fields
update_table Airtable
Update a table's name or description
create_field Airtable
Add a new field to a table
update_field Airtable
Modify an existing field
create_record Airtable
Add a new record
update_record Airtable
Modify an existing record

RELATED READING

FREQUENTLY ASKED QUESTIONS

What does the update-contact tool do?

Update an existing contact. It is categorised as a Write tool in the Resend MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update-contact?

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

What risk level is update-contact?

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

Can I rate-limit update-contact?

Yes. Add a rate_limit block to the update-contact 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 update-contact completely?

Set action: deny in the Intercept policy for update-contact. 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 update-contact?

update-contact is provided by the Resend MCP server (resend-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

ENFORCE POLICIES ON RESEND

Open source. One binary. Zero dependencies.

VIEW ON GITHUB Full Resend policy →