Fetch the full sequence files for a dehydrated genome package.
AI agents call rehydrate_genome_package to retrieve information from Ncbi Datasets without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves genomic sequence data that has been previously downloaded and stored in a dehydrated format. 'Rehydrating' is a data retrieval operation that restores full sequence information without modifying, deleting, or executing operations.
From the tool's definition Tool description: 'Fetch the full sequence files for a dehydrated genome package.' The verb 'fetch' indicates retrieval of data. No modification, deletion, or execution of code is described. The tool retrieves pre-existing sequence data from a package.
Attacks that exploit this kind of access
Fetch the full sequence files for a dehydrated genome package. It is categorised as a Read tool in the Ncbi Datasets MCP Server, which means it retrieves data without modifying state.
Register the Ncbi Datasets MCP server in PolicyLayer and add a rule for rehydrate_genome_package: 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 Ncbi Datasets. Nothing to install.
rehydrate_genome_package 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 rehydrate_genome_package 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 rehydrate_genome_package. 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.
rehydrate_genome_package is provided by the Ncbi Datasets MCP server (syntheticgio/ncbi-datasets-mcp-server). 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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