execute_scalar

// WHEN AI AGENTS USE THIS TOOL

AI agents invoke execute_scalar to trigger processes or run actions in Mssql. 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 EXECUTE_SCALAR

execute_scalar 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-daedalus-mcp-server-mssql.yaml

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

See the full Mssql policy for all 21 tools.

// DETAILS

Tool Name execute_scalar

Category Execute

MCP Server Mssql MCP Server

Risk Level High

// MORE MSSQL TOOLS

Execute build_connection_string Execute execute_query Execute parse_connection_string Write bulk_copy Write close_connection Write commit Write connect_tool Write set_autocommit

View all 21 tools →

// WHAT CAN GO WRONG

Agents calling execute-class tools like execute_scalar 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

execute_scalar is one of the high-risk operations in Mssql. 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 execute_scalar tool do? +

Execute SQL and return single value. It is categorised as a Execute tool in the Mssql MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on execute_scalar? +

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

What risk level is execute_scalar? +

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

Can I rate-limit execute_scalar? +

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

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

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

Enforce policies on Mssql