AI agents call get_map_screenshot to retrieve information from OSM PostgreSQL Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Screenshot capture is a read-only operation that retrieves the current visual state of the map without side effects, altering data, or executing external operations. The empty description reduces confidence slightly, but the naming convention and context of visualization tools strongly suggest data retrieval rather than modification or execution.
From the tool's definition Tool name 'get_map_screenshot' suggests retrieval of visual map data. No description provided, but based on sibling tools (add_map_marker, add_map_polygon, get_map_view, set_map_view) which are map visualization operations, this tool likely retrieves or…
Documented attack patterns abuse exactly the kind of access get_map_screenshot gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OSM PostgreSQL Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_map_screenshot:
{
"version": "1",
"default": "deny",
"tools": {
"get_map_screenshot": {}
}
}get_map_screenshot is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_map_screenshot. It is categorised as a Read tool in the OSM PostgreSQL Server MCP Server, which means it retrieves data without modifying state.
Register the OSM PostgreSQL Server MCP server in PolicyLayer and add a rule for get_map_screenshot: 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 OSM PostgreSQL Server. Nothing to install.
get_map_screenshot is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_map_screenshot 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.
Set action: deny in the PolicyLayer policy for get_map_screenshot. 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.
get_map_screenshot is provided by the OSM PostgreSQL Server MCP server (wiseman/osm-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 9 OSM PostgreSQL Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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9 OSM PostgreSQL Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.