delete_symbol

THE RISK

Critical Risk

Why delete_symbol needs a policy

This tool irreversibly deletes code artifacts (functions, classes, symbols) from the codebase. Deletion is a destructive operation that cannot be undone through the tool itself. While it operates at the symbol level rather than entire files, the effect is permanent data loss.

From the tool's definition Tool name is 'delete_symbol' with description stating 'Delete a symbol' and 'Remove function/class/etc cleanly.' The 🗑️ emoji and explicit mention of 'deletion' indicate irreversible removal of code.

Documented attack patterns abuse exactly the kind of access delete_symbol gives an agent:

POLICY

How to control delete_symbol

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Context Manager, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_symbol:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "delete_symbol"
  ]
}

delete_symbol disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register MCP Context Manager — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Destructive clear_cache Clear the cached index for a repository. Useful if cache becomes corrupted or you want to Execute build_dependency_graph 🚀 NEW: Build dependency graph for the entire codebase. Call this once after indexing to e Execute index_repository 🔧 REQUIRED FIRST STEP: Index or re-index the repository to enable all context-manager too Write insert_after_symbol ✏️ NEW: Insert code after a symbol (Serena-inspired). Symbol-level editing without reading Write replace_symbol ✏️ NEW: Replace a symbol with new code (Serena-inspired). Surgical precision editing. Repl Read find_similar Find code similar to a given symbol. Useful for discovering related implementations, simil Read find_symbol ⭐ PREFERRED FOR SYMBOLS: Use this INSTEAD OF Grep when looking for specific functions, cla Read find_symbol_references 🔍 NEW: Find all places where a symbol is used (Serena-inspired). Shows usages across all

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Go deeper

Critical-risk tools in MCP Context Manager → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about delete_symbol

What does the delete_symbol tool do? +

🗑️ NEW: Delete a symbol (Serena-inspired). Remove function/class/etc cleanly. Symbol-level deletion. Use for cleanup and refactoring. FREE & FAST. It is categorised as a Destructive tool in the MCP Context Manager MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on delete_symbol? +

Register the MCP Context Manager MCP server in PolicyLayer and add a rule for delete_symbol: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Context Manager. Nothing to install.

What risk level is delete_symbol? +

delete_symbol is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit delete_symbol? +

Yes. Add a rate_limit block to the delete_symbol rule in your PolicyLayer 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 delete_symbol completely? +

Set action: deny in the PolicyLayer policy for delete_symbol. 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 delete_symbol? +

delete_symbol is provided by the MCP Context Manager MCP server (transparentlyok/mcp-context-manager). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Context Manager tool call.

Start from MCP Context Manager, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →