回显输入文本，用于联调参数解析与工具调用。
AI agents call echo to retrieve information from Bun Novel Processor MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Echo tools return input as output without side effects. This is a Read category operation (data retrieval/reflection only). Severity is low because it poses minimal security risk—an agent cannot misuse an echo tool to cause damage, though it could be used for probing or protocol analysis. Confidence is high given the clear diagnostic nature of the tool and its position within a novel processing server context.
From the tool's definition Tool description states '回显输入文本' (echo input text), used for 'parameter parsing and tool invocation debugging' (联调参数解析与工具调用). This is a simple echo/reflection utility with no data modification, deletion, or external operation effects.
Attacks that exploit this kind of access
回显输入文本，用于联调参数解析与工具调用。. It is categorised as a Read tool in the Bun Novel Processor MCP MCP Server, which means it retrieves data without modifying state.
Register the Bun Novel Processor MCP server in PolicyLayer and add a rule for echo: 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 Bun Novel Processor MCP. Nothing to install.
echo 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 echo 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 echo. 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.
echo is provided by the Bun Novel Processor MCP server (tietiezhi-1216/mcp). 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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