update_schema · StarTree MCP Server for Apache Pinot MCP

WHAT IT DOES

What update_schema does on StarTree MCP Server for Apache Pinot

AI agents use update_schema to create or update resources in StarTree MCP Server for Apache Pinot — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your StarTree MCP Server for Apache Pinot environment.

THE RISK

Medium Risk

Why update_schema needs a policy

The tool modifies existing data structures (schemas) but does not delete them irreversibly or execute arbitrary code. Schema updates are Write operations - they change configuration state reversibly. Severity is medium because incorrect schema modifications could impact data ingestion or query correctness across the Pinot cluster, but the effect is typically recoverable through a schema downgrade or correction.

From the tool's definition Tool name is 'update_schema' and description states 'Update an existing schema'. This directly modifies schema metadata in Apache Pinot, which is a reversible operation.

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

POLICY

How to control update_schema

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

policy.json

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

update_schema 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 StarTree MCP Server for Apache Pinot — 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 StarTree MCP Server for Apache Pinot tools

Destructive reset-table-segments Resets segments for a table (disable->wait->enable). Use Execute force_commit Force commit the current consuming segments Execute pause_consumption Pause consumption of a realtime table Execute read_query Execute a SELECT query on the Pinot database Execute rebalance-table Rebalances a table (reassign instances and segments) Execute reload_table_filters reload_table_filters Execute reload-table-segments Reload all segments for a table (applies config changes, can Execute resume_consumption Resume consumption of a realtime table

All 26 StarTree MCP Server for Apache Pinot tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

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_schema

What does the update_schema tool do? +

Update an existing schema. It is categorised as a Write tool in the StarTree MCP Server for Apache Pinot 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_schema? +

Register the StarTree MCP Server for Apache Pinot MCP server in PolicyLayer and add a rule for update_schema: 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 StarTree MCP Server for Apache Pinot. Nothing to install.

What risk level is update_schema? +

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

Can I rate-limit update_schema? +

Yes. Add a rate_limit block to the update_schema 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_schema completely? +

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

update_schema is provided by the StarTree MCP Server for Apache Pinot MCP server (startreedata/mcp-pinot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every StarTree MCP Server for Apache Pinot tool call.

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

CHECK YOUR STACK →

Free to start. No card required.

26 StarTree MCP Server for Apache Pinot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.