list_sessions

List all Claude Code sessions with health status. Shows session ID, project, size, message count, and whether the session is healthy, corrupted, empty, or orphaned.

ServerClaude Code Toolkit
CategoryRead

How to control list_sessions ↓

WHAT IT DOES

What list_sessions does on Claude Code Toolkit

AI agents call list_sessions to retrieve information from Claude Code Toolkit without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why list_sessions needs a policy

This tool retrieves and displays session information for observability purposes without side effects. It fits the Read category definition: 'retrieves or queries data; no side effects (search, list, get, fetch)'.

From the tool's definition Tool description states it 'List[s] all Claude Code sessions' and 'Shows session ID, project, size, message count, and whether the session is healthy'.

Documented attack patterns abuse exactly the kind of access list_sessions gives an agent:

POLICY

How to control list_sessions

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Code Toolkit, and nothing reaches the server without passing your rules. This is the rule we recommend for list_sessions:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_sessions": {}
  }
}

list_sessions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Claude Code Toolkit — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Claude Code Toolkit tools

Destructive cleanup_backups Delete old backup files to free up disk space. Destructive wipe_traces Securely wipe ALL Claude Code traces. Overwrites files with zeros before deletion. Require Destructive clean_claude_directory Analyze and clean the .claude directory. Removes debug logs, empty todos, old snapshots, a Destructive clean_traces Selectively clean Claude Code traces by category, age, or project. Destructive enforce_retention Apply data retention policy by deleting sessions older than specified days. Execute run_doctor Full integrity check: detects corrupted JSONL lines, truncated thinking blocks, oversized Execute run_maintenance Run maintenance checks on Claude Code installation. Identifies issues, old backups, and ar Execute start_dashboard Start the web dashboard on a local port. Returns the URL to open in a browser.

All 40 Claude Code Toolkit tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_sessions

What does the list_sessions tool do? +

List all Claude Code sessions with health status. Shows session ID, project, size, message count, and whether the session is healthy, corrupted, empty, or orphaned. It is categorised as a Read tool in the Claude Code Toolkit MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_sessions? +

Register the Claude Code Toolkit MCP server in PolicyLayer and add a rule for list_sessions: 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 Code Toolkit. Nothing to install.

What risk level is list_sessions? +

list_sessions is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_sessions? +

Yes. Add a rate_limit block to the list_sessions 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.

How do I block list_sessions completely? +

Set action: deny in the PolicyLayer policy for list_sessions. 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.

What MCP server provides list_sessions? +

list_sessions is provided by the Claude Code Toolkit MCP server (asifkibria/claude-code-toolkit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Code Toolkit tool call.

Start from Claude Code Toolkit, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

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40 Claude Code Toolkit tools catalogued and risk-classified — across an index of 43,000+ MCP servers.