Start a work session. If a project is provided (project_name or project_id), the session is bound to it; if neither is provided, an unbound (projectless) session is created — useful when the work isn't tied to a specific project. Reuses an existing active session for the same scope (per-project, ...
Part of the ContextLayer server.
Free to start. No card required.
AI agents invoke start_session to trigger processes or run actions in ContextLayer. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
start_session can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"start_session": {
"limits": [
{
"counter": "start_session_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full ContextLayer policy for all 62 tools.
These attack patterns abuse exactly the kind of access start_session gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Start a work session. If a project is provided (project_name or project_id), the session is bound to it; if neither is provided, an unbound (projectless) session is created — useful when the work isn't tied to a specific project. Reuses an existing active session for the same scope (per-project, or one global projectless session per user). Task type: coding, review, planning, debugging, research, meeting, other.. It is categorised as a Execute tool in the ContextLayer MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the ContextLayer MCP server in PolicyLayer and add a rule for start_session: 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 ContextLayer. Nothing to install.
start_session is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the start_session 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 start_session. 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.
start_session is provided by the ContextLayer MCP server (https://api.dotnova.io/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 62 ContextLayer tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.