Read multiple storage slots in parallel. Pass slots (explicit list) or start+count (sequential range). All target the same block. Cap 256 slots. decode: true adds typeHint + decoded value per slot (string/address/uint heuristics).
Part of the Kosyak Evm server.
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AI agents call read_storage_batch to retrieve information from Kosyak Evm without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though read_storage_batch only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"read_storage_batch": {}
}
}See the full Kosyak Evm policy for all 50 tools.
These attack patterns abuse exactly the kind of access read_storage_batch gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Read multiple storage slots in parallel. Pass slots (explicit list) or start+count (sequential range). All target the same block. Cap 256 slots. decode: true adds typeHint + decoded value per slot (string/address/uint heuristics).. It is categorised as a Read tool in the Kosyak Evm MCP Server, which means it retrieves data without modifying state.
Register the Kosyak Evm MCP server in PolicyLayer and add a rule for read_storage_batch: 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 Kosyak Evm. Nothing to install.
read_storage_batch 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 read_storage_batch 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 read_storage_batch. 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.
read_storage_batch is provided by the Kosyak Evm MCP server (kosyak-evm-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 50 Kosyak Evm tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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