update_context_data

THE RISK

Medium Risk

Why update_context_data needs a policy

This tool creates or modifies data in a reversible manner, fitting the Write category. The context is mock API test data, so misuse could corrupt test scenarios or mock server configurations, but effects are generally reversible (data can be updated again).

From the tool's definition Tool name 'update_context_data' and description 'Updates data in a specific context' indicate modification of existing data. The verb 'update' is explicitly a write operation that modifies data reversibly.

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

POLICY

How to control update_context_data

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

policy.json

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

update_context_data 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 MockLoop MCP Server — 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 →

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EXPLORE

Related tools and policies

More MockLoop MCP Server tools

Execute deploy_scenario Deploys scenario to MockLoop server. Execute execute_test_plan Combines scenario generation and deployment in one operation. Execute run_load_test Executes load testing with configurable parameters. Execute run_security_test Executes security testing scenarios for vulnerability assessment. Execute run_test_iteration Executes a single test iteration with monitoring. Execute generate_mock_api Generates a FastAPI mock server from an API specification (e.g., OpenAPI). Execute schedule_test_suite Schedules automated test suite execution. Execute switch_scenario Switches active scenario on a server.

All 30 MockLoop MCP Server tools →

Write tools on other servers

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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 update_context_data

What does the update_context_data tool do? +

Updates data in a specific context. It is categorised as a Write tool in the MockLoop MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_context_data? +

Register the MockLoop MCP Server MCP server in PolicyLayer and add a rule for update_context_data: 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 MockLoop MCP Server. Nothing to install.

What risk level is update_context_data? +

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

Can I rate-limit update_context_data? +

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

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

update_context_data is provided by the MockLoop MCP Server MCP server (mockloop/mockloop-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MockLoop MCP Server tool call.

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

CHECK YOUR STACK →