list_functions
List functions in a service
Part of the Twilio MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
WHEN AI AGENTS USE THIS TOOL
AI agents call list_functions to retrieve information from Twilio without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions — but you may still want rate limits to control API costs.
WHY ENFORCE A POLICY ON LIST_FUNCTIONS
Even though list_functions only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
RECOMMENDED POLICY
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
list_functions:
rules:
- action: allowSee the full Twilio policy for all 36 tools.
DETAILS
MORE TWILIO TOOLS
get_account Read get_call Read get_flow Read get_incoming_phone_number Read get_message Read list_accounts Read list_calls Read list_conversations Read SIMILAR READ TOOLS ON OTHER SERVERS
list_bases Airtable list_tables Airtable list_records Airtable get_record Airtable search_records Airtable search Amplitude RELATED READING
FREQUENTLY ASKED QUESTIONS
What does the list_functions tool do?
List functions in a service. It is categorised as a Read tool in the Twilio MCP Server, which means it retrieves data without modifying state.
How do I enforce a policy on list_functions?
Add a rule in your Intercept YAML policy under the tools section for list_functions. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Twilio MCP server.
What risk level is list_functions?
list_functions is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Can I rate-limit list_functions?
Yes. Add a rate_limit block to the list_functions 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 list_functions completely?
Set action: deny in the Intercept policy for list_functions. 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 list_functions?
list_functions is provided by the Twilio MCP server (twilio-labs/mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
ENFORCE POLICIES ON TWILIO
Open source. One binary. Zero dependencies.