List all Redmine custom fields.
AI agents call list_custom_fields to retrieve information from Redmine MCP OAuth Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query of custom field metadata in Redmine. It returns information about available custom fields without creating, modifying, or deleting any data. The blast radius of misuse is minimal — an agent could learn about the structure of custom fields but cannot harm data or trigger external operations.
From the tool's definition Tool name is 'list_custom_fields' and description states 'List all Redmine custom fields' — retrieves/queries configuration data with no modification or side effects.
Attacks that exploit this kind of access
List all Redmine custom fields. It is categorised as a Read tool in the Redmine MCP OAuth Server MCP Server, which means it retrieves data without modifying state.
Register the Redmine MCP OAuth Server MCP server in PolicyLayer and add a rule for list_custom_fields: 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 Redmine MCP OAuth Server. Nothing to install.
list_custom_fields 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 list_custom_fields 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 list_custom_fields. 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.
list_custom_fields is provided by the Redmine MCP OAuth Server MCP server (zh/redmine_mcp_py). 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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