Read a value from AsyncStorage or MMKV by key. Works via SDK (preferred) or CDP fallback for AsyncStorage.
AI agents call get_storage_value to retrieve information from Mcp Rn Devtools without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves stored data without modifying, deleting, or executing code. It is a read-only query operation on application storage. The 'Read' category is appropriate for data retrieval operations. Severity is low because accessing storage values in a debugging context has minimal blast radius—the tool cannot modify data or trigger external actions based on the retrieved values alone.
From the tool's definition Tool name includes 'get_' prefix and description states 'Read a value from AsyncStorage or MMKV by key' with no mention of modification, deletion, or side effects.
Attacks that exploit this kind of access
Read a value from AsyncStorage or MMKV by key. Works via SDK (preferred) or CDP fallback for AsyncStorage. It is categorised as a Read tool in the Mcp Rn Devtools MCP Server, which means it retrieves data without modifying state.
Register the Mcp Rn Devtools MCP server in PolicyLayer and add a rule for get_storage_value: 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 Mcp Rn Devtools. Nothing to install.
get_storage_value 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 get_storage_value 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 get_storage_value. 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.
get_storage_value is provided by the Mcp Rn Devtools MCP server (pablonortiz/mcp-rn-devtools). 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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