insert_after_symbol

✏️ NEW: Insert code after a symbol (Serena-inspired). Symbol-level editing without reading full files. Precise insertion at exact location. Auto-detects symbol end. FREE & NO LSP NEEDED.

ServerMCP Context Manager
CategoryWrite

How to control insert_after_symbol ↓

WHAT IT DOES

What insert_after_symbol does on MCP Context Manager

AI agents use insert_after_symbol to create or update resources in MCP Context Manager — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MCP Context Manager environment.

THE RISK

Medium Risk

Why insert_after_symbol needs a policy

This tool modifies code by inserting content at a specified location in a source file. The operation is reversible (the inserted code can be removed), distinguishing it from Destructive actions. It does not execute code, trigger external operations, or affect financial systems.

From the tool's definition Tool name 'insert_after_symbol' and description explicitly states 'Insert code after a symbol' and 'Symbol-level editing'. The description emphasizes insertion capability, which creates/modifies code reversibly.

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

POLICY

How to control insert_after_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 insert_after_symbol:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "insert_after_symbol": {
      "limits": [
        {
          "counter": "insert_after_symbol_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

insert_after_symbol stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP Context Manager tools

Destructive clear_cache Clear the cached index for a repository. Useful if cache becomes corrupted or you want to Destructive delete_symbol 🗑️ NEW: Delete a symbol (Serena-inspired). Remove function/class/etc cleanly. Symbol-leve 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 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

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about insert_after_symbol

What does the insert_after_symbol tool do? +

✏️ NEW: Insert code after a symbol (Serena-inspired). Symbol-level editing without reading full files. Precise insertion at exact location. Auto-detects symbol end. FREE & NO LSP NEEDED. It is categorised as a Write tool in the MCP Context Manager MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on insert_after_symbol? +

Register the MCP Context Manager MCP server in PolicyLayer and add a rule for insert_after_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 insert_after_symbol? +

insert_after_symbol is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit insert_after_symbol? +

Yes. Add a rate_limit block to the insert_after_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 insert_after_symbol completely? +

Set action: deny in the PolicyLayer policy for insert_after_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 insert_after_symbol? +

insert_after_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 →

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21 MCP Context Manager tools catalogued and risk-classified — across an index of 43,000+ MCP servers.