Store or replace the default field mapping for a connection. Supply a schema with destination fields, payload sources, and optional transforms like trim, lower, default, or type conversion.
AI agents use meshes_update_connection_default_mappings to create or update resources in Mesheshq — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mesheshq environment.
This tool creates or modifies field mapping configuration for a connection, which is a reversible operation affecting how data is processed. While it modifies system configuration that could impact downstream behavior, the action itself is not destructive, does not execute arbitrary code, and involves no financial transactions.
From the tool's definition Tool description states 'Store or replace the default field mapping' which indicates modification of existing configuration data. The word 'replace' confirms reversible data update rather than deletion.
Attacks that exploit this kind of access
Store or replace the default field mapping for a connection. Supply a schema with destination fields, payload sources, and optional transforms like trim, lower, default, or type conversion. It is categorised as a Write tool in the Mesheshq MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mesheshq MCP server in PolicyLayer and add a rule for meshes_update_connection_default_mappings: 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 Mesheshq. Nothing to install.
meshes_update_connection_default_mappings is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the meshes_update_connection_default_mappings 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 meshes_update_connection_default_mappings. 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.
meshes_update_connection_default_mappings is provided by the Mesheshq MCP server (mesheshq/meshes-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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