Extracts key-value pairs from arbitrary noisy text and returns them as type-safe YAML (str).
AI agents call extract_yaml to retrieve information from Flexible Key-Value Extracting MCP 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 extraction operation that parses input text and returns formatted output. It retrieves/queries data (extracting key-value pairs) with no side effects, reversible modifications, code execution, data deletion, or financial implications. The operation is purely data transformation from one format to another, characteristic of a Read category tool.
From the tool's definition The tool 'extracts key-value pairs from arbitrary noisy text and returns them as type-safe YAML' — it retrieves and transforms structured data from input text without modifying any underlying data sources or triggering side effects.
Attacks that exploit this kind of access
Extracts key-value pairs from arbitrary noisy text and returns them as type-safe YAML (str). It is categorised as a Read tool in the Flexible Key-Value Extracting MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Flexible Key-Value Extracting MCP Server MCP server in PolicyLayer and add a rule for extract_yaml: 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 Flexible Key-Value Extracting MCP Server. Nothing to install.
extract_yaml 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 extract_yaml 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 extract_yaml. 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.
extract_yaml is provided by the Flexible Key-Value Extracting MCP Server MCP server (kunihiros/kv-extractor-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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