Number of qubits in the chain (default: 5, range: 2-20)
Part of the Qiskit IBM Runtime MCP Server MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call chain_length to retrieve information from Qiskit IBM Runtime MCP Server 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 chain_length 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.
tools:
chain_length:
rules:
- action: allowSee the full Qiskit IBM Runtime MCP Server policy for all 62 tools.
Agents calling read-class tools like chain_length have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Number of qubits in the chain (default: 5, range: 2-20). It is categorised as a Read tool in the Qiskit IBM Runtime MCP Server MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for chain_length. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Qiskit IBM Runtime MCP Server MCP server.
chain_length 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 chain_length 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 chain_length. 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.
chain_length is provided by the Qiskit IBM Runtime MCP Server MCP server (qiskit-ibm-runtime-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept