Call any function on a smart contract on the COTI blockchain. Supports both read-only (view/pure) functions and state-changing (write) functions. Read-only functions return data without creating a transaction. State-changing functions create transactions and may require gas_limit. Returns the fun...
Handles credentials or secrets (private_key)
Part of the COTI MCP Server MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use call_contract_function to create or modify resources in COTI MCP Server. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call call_contract_function repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach COTI MCP Server.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
call_contract_function:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full COTI MCP Server policy for all 44 tools.
Agents calling write-class tools like call_contract_function have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
Call any function on a smart contract on the COTI blockchain. Supports both read-only (view/pure) functions and state-changing (write) functions. Read-only functions return data without creating a transaction. State-changing functions create transactions and may require gas_limit. Returns the function result in a human-readable format.. It is categorised as a Write tool in the COTI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Add a rule in your Intercept YAML policy under the tools section for call_contract_function. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the COTI MCP Server MCP server.
call_contract_function is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the call_contract_function rule in your Intercept 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 Intercept policy for call_contract_function. 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.
call_contract_function is provided by the COTI MCP Server MCP server (davibauer/coti-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.