List known channels (targets) based on env CLAUDE_CODEX_CHANNELS and observed traffic.
AI agents call list_channels to retrieve information from Claude ↔ Codex MCP Relay without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of available channels based on environment configuration and observed traffic. It is purely informational—listing channels does not create, modify, delete, or execute any actions. The blast radius if misused is minimal; an agent could only discover what channels exist, which poses low risk in a collaborative code review context.
From the tool's definition Tool name 'list_channels' and description 'List known channels (targets)' indicate a retrieval operation with no side effects. The verb 'list' is a classic Read operation that enumerates existing resources without modifying or executing anything.
Attacks that exploit this kind of access
List known channels (targets) based on env CLAUDE_CODEX_CHANNELS and observed traffic. It is categorised as a Read tool in the Claude ↔ Codex MCP Relay MCP Server, which means it retrieves data without modifying state.
Register the Claude ↔ Codex MCP Relay MCP server in PolicyLayer and add a rule for list_channels: 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 Claude ↔ Codex MCP Relay. Nothing to install.
list_channels 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 list_channels 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 list_channels. 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.
list_channels is provided by the Claude ↔ Codex MCP Relay MCP server (wiresharks/claudecodex). 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.
Teams ship this data inside their own products. See what a licence covers →