get_session_context

THE RISK

Low Risk

Why get_session_context needs a policy

This tool queries and retrieves contextual information from past sessions. It has no destructive, financial, or execute characteristics. The operation is read-only—it fetches pre-existing session context without creating, modifying, or deleting data.

From the tool's definition 'Get detailed context for a specific file or concept from past sessions' describes retrieval of historical session data without modification or execution of external operations.

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

POLICY

How to control get_session_context

PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Writer's Aid MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_session_context:

policy.json

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

get_session_context 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 Writer's Aid MCP — 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

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All 34 Claude Writer's Aid MCP tools →

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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 get_session_context

What does the get_session_context tool do? +

Get detailed context for a specific file or concept from past sessions. It is categorised as a Read tool in the Claude Writer's Aid MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_session_context? +

Register the Claude Writer's Aid MCP server in PolicyLayer and add a rule for get_session_context: 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 Writer's Aid MCP. Nothing to install.

What risk level is get_session_context? +

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

Can I rate-limit get_session_context? +

Yes. Add a rate_limit block to the get_session_context 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 get_session_context completely? +

Set action: deny in the PolicyLayer policy for get_session_context. 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 get_session_context? +

get_session_context is provided by the Claude Writer's Aid MCP server (xiaolai/claude-writers-aid-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Writer's Aid MCP tool call.

Start from Claude Writer's Aid MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →