Serialize a JavaScript value to a YAML string
AI agents call yaml__stringify to retrieve information from Code Mode Bridge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool converts an in-memory JavaScript value into a YAML-formatted string. It is a pure serialization/transformation operation with no side effects, no data persistence, no external calls, and no destructive actions. It only reads/transforms the input value and returns a string representation.
From the tool's definition Serialize a JavaScript value to a YAML string
Attacks that exploit this kind of access
Serialize a JavaScript value to a YAML string. It is categorised as a Read tool in the Code Mode Bridge MCP Server, which means it retrieves data without modifying state.
Register the Code Mode Bridge MCP server in PolicyLayer and add a rule for yaml__stringify: 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 Code Mode Bridge. Nothing to install.
yaml__stringify 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 yaml__stringify 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 yaml__stringify. 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.
yaml__stringify is provided by the Code Mode Bridge MCP server (ruifung/mcp-cm-bridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
yaml__stringify is one line of Code Mode Bridge's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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