AI agents call wb_retro to retrieve information from Workbench without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to aggregate and distill retrospective evidence — feedback weighted by half-life decay, skill candidates, red flags, observations, and approval throughput reports. This is fundamentally a read/reporting operation: it retrieves and summarizes historical data without modifying, executing, or deleting anything.
From the tool's definition retrospective 证据包:反馈半衰期加权提炼(skill 候选/Red Flags/观察)+ 审批吞吐报表
Attacks that exploit this kind of access
retrospective 证据包:反馈半衰期加权提炼(skill 候选/Red Flags/观察)+ 审批吞吐报表。. It is categorised as a Read tool in the Workbench MCP Server, which means it retrieves data without modifying state.
Register the Workbench MCP server in PolicyLayer and add a rule for wb_retro: 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 Workbench. Nothing to install.
wb_retro 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 wb_retro 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 wb_retro. 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.
wb_retro is provided by the Workbench MCP server (nvrenshiren/workbench). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
wb_retro is one line of Workbench's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →