Decompile a contract's bytecode via locally-installed heimdall (needs heimdall in PATH or HEIMDALL_PATH). Raw passthrough — heimdall is known to mistype bytes/array args as uint256 and emit spurious require(msg.value); verify with find_recent_calls.
Part of the Kosyak Evm server.
Free to start. No card required.
AI agents may call decompile_local to permanently remove or destroy resources in Kosyak Evm. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call decompile_local in a loop, permanently destroying resources in Kosyak Evm. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"decompile_local"
]
}See the full Kosyak Evm policy for all 50 tools.
These attack patterns abuse exactly the kind of access decompile_local gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Decompile a contract's bytecode via locally-installed heimdall (needs heimdall in PATH or HEIMDALL_PATH). Raw passthrough — heimdall is known to mistype bytes/array args as uint256 and emit spurious require(msg.value); verify with find_recent_calls.. It is categorised as a Destructive tool in the Kosyak Evm MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Kosyak Evm MCP server in PolicyLayer and add a rule for decompile_local: 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.
decompile_local is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the decompile_local 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 decompile_local. 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.
decompile_local 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.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.