// MCP TOOL REFERENCE

build_symbol_index

Warm the symbol index for faster navigation.

Accepts file system path (path)

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

@aiready/ast-mcp-server Execute Risk 4/5

// WHEN AI AGENTS USE THIS TOOL

AI agents invoke build_symbol_index to trigger processes or run actions in Ast. 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 BUILD_SYMBOL_INDEX

build_symbol_index 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.

ast.yaml

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

See the full Ast policy for all 13 tools.

// DETAILS

Tool Name build_symbol_index

Category Execute

MCP Server Ast MCP Server

Risk Level High

// MORE AST TOOLS

Write resolve_definition Read check_symbol_grounding Read codebase_audit Read find_implementations Read find_references Read get_call_hierarchy Read get_file_structure Read get_symbol_docs

View all 13 tools →

// WHAT CAN GO WRONG

Agents calling execute-class tools like build_symbol_index 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

build_symbol_index is one of the high-risk operations in Ast. 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 build_symbol_index tool do? +

Warm the symbol index for faster navigation.. It is categorised as a Execute tool in the Ast MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on build_symbol_index? +

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

What risk level is build_symbol_index? +

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

Can I rate-limit build_symbol_index? +

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

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

build_symbol_index is provided by the Ast MCP server (@aiready/ast-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

build_symbol_index

Enforce policies on Ast