refine_markers

THE RISK

Medium Risk

Why refine_markers needs a policy

This tool updates marker positions in a Metashape project, making it a Write operation. The modification is reversible (positions can be adjusted again), so it is not Destructive.

From the tool's definition Tool description states it 'refine[s] marker positions', which modifies existing data (marker coordinates) in the photogrammetry project. The term 'refine' indicates an update operation rather than retrieval or deletion.

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

POLICY

How to control refine_markers

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

policy.json

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

refine_markers 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 Metashape 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 →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 112 Metashape 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 refine_markers

What does the refine_markers tool do? +

Refine marker positions for sub-pixel accuracy. It is categorised as a Write tool in the Metashape 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 refine_markers? +

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

What risk level is refine_markers? +

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

Can I rate-limit refine_markers? +

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

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

refine_markers is provided by the Metashape MCP Server MCP server (jenkinsm13/metashape-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Metashape MCP Server tool call.

Start from Metashape 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 →