GMAIL_MODIFY_THREAD_LABELS

Adds or removes specified existing label ids from a gmail thread, affecting all its messages; ensure the thread id is valid.

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

gmail-mcp Write Risk 2/5

// WHEN AI AGENTS USE THIS TOOL

AI agents use GMAIL_MODIFY_THREAD_LABELS to create or modify resources in Gmail. 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 GMAIL_MODIFY_THREAD_LABELS

Without a policy, an AI agent could call GMAIL_MODIFY_THREAD_LABELS 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 Gmail.

// RECOMMENDED POLICY

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

gmail.yaml

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

See the full Gmail policy for all 20 tools.

// DETAILS

Tool Name GMAIL_MODIFY_THREAD_LABELS

Category Write

MCP Server Gmail MCP Server

Risk Level Medium

// MORE GMAIL TOOLS

Destructive GMAIL_DELETE_DRAFT Destructive GMAIL_DELETE_MESSAGE Destructive GMAIL_REMOVE_LABEL Write GMAIL_ADD_LABEL_TO_EMAIL Write GMAIL_CREATE_EMAIL_DRAFT Write GMAIL_CREATE_LABEL Write GMAIL_MOVE_TO_TRASH Write GMAIL_PATCH_LABEL

View all 20 tools →

// WHAT CAN GO WRONG

Agents calling write-class tools like GMAIL_MODIFY_THREAD_LABELS 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 GMAIL_MODIFY_THREAD_LABELS tool do? +

Adds or removes specified existing label ids from a gmail thread, affecting all its messages; ensure the thread id is valid.. It is categorised as a Write tool in the Gmail MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on GMAIL_MODIFY_THREAD_LABELS? +

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

What risk level is GMAIL_MODIFY_THREAD_LABELS? +

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

Can I rate-limit GMAIL_MODIFY_THREAD_LABELS? +

Yes. Add a rate_limit block to the GMAIL_MODIFY_THREAD_LABELS 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 GMAIL_MODIFY_THREAD_LABELS completely? +

Set action: deny in the Intercept policy for GMAIL_MODIFY_THREAD_LABELS. 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 GMAIL_MODIFY_THREAD_LABELS? +

GMAIL_MODIFY_THREAD_LABELS is provided by the Gmail MCP server (gmail-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

GMAIL_MODIFY_THREAD_LABELS

Enforce policies on Gmail