// MCP TOOL REFERENCE

create_function_schema

Generate JSON Schema for function calling

Sends prompts to external DeepSeek API

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

@arikusi/deepseek-mcp-server Execute Risk 2/5

// WHEN AI AGENTS USE THIS TOOL

AI agents invoke create_function_schema to trigger processes or run actions in Deepseek. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.

// WHY ENFORCE A POLICY ON CREATE_FUNCTION_SCHEMA

create_function_schema can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. Intercept enforces rate limits and validates arguments to keep execution within safe bounds.

// RECOMMENDED POLICY

Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.

io-github-arikusi-deepseek.yaml

tools:
  create_function_schema:
    rules:
      - action: allow
        rate_limit:
          max: 10
          window: 60
        validate:
          required_args: true

See the full Deepseek policy for all 15 tools.

// DETAILS

Tool Name create_function_schema

Category Execute

MCP Server Deepseek MCP Server

Risk Level High

// MORE DEEPSEEK TOOLS

Execute argument_validation Execute code_review_deep Execute creative_ideation Execute debug_with_reasoning Execute explain_like_im_five Execute function_call_debug Execute mathematical_proof Execute pair_programming

View all 15 tools →

// WHAT CAN GO WRONG

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

Browse the full MCP Attack Database →

// OTHER EXECUTE TOOLS ACROSS MCP SERVERS

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

Agent Passport System — Cryptographic Identity for AI Agents commerce_preflight Agent Passport System — Cryptographic Identity for AI Agents execute_with_context Agent Passport System — Cryptographic Identity for AI Agents gateway_execute_approval Agent Passport System — Cryptographic Identity for AI Agents governance_360 Agent Passport System — Cryptographic Identity for AI Agents parse_governance_block_html AgentClear — API Marketplace for AI Agents call_service

// IN CONTEXT OF HIGH RISK

create_function_schema is one of the high-risk operations in Deepseek. For the full severity-focused view — only the high-risk tools with their recommended policies — see the breakdown for this server, or browse all high-risk tools across every MCP server.

// RELATED READING

// FAQ

What does the create_function_schema tool do? +

Generate JSON Schema for function calling. It is categorised as a Execute tool in the Deepseek MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on create_function_schema? +

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

What risk level is create_function_schema? +

create_function_schema is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit create_function_schema? +

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

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

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

create_function_schema

Enforce policies on Deepseek