AI agents invoke execute_all_cells to trigger actions in Ast Editor. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
The tool performs code execution with side effects that depend on cell contents and order. While the description is empty, the name and context strongly indicate this executes code cells rather than merely reading or modifying them. Code execution poses high risk if an AI agent misuses it (e.g., running malicious commands, accessing systems, or corrupting state).
From the tool's definition Tool name 'execute_all_cells' indicates execution of code cells, likely from a notebook-like environment. The server description confirms it is designed for 'AI coding agents,' and the presence of sibling tools (add_cell, add_import, etc.) in an AST editor…
Documented attack patterns abuse exactly the kind of access execute_all_cells gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ast Editor, and nothing reaches the server without passing your rules. This is the rule we recommend for execute_all_cells:
{
"version": "1",
"default": "deny",
"tools": {
"execute_all_cells": {
"limits": [
{
"counter": "execute_all_cells_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}execute_all_cells stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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execute_all_cells. It is categorised as a Execute tool in the Ast Editor MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Ast Editor MCP server in PolicyLayer and add a rule for execute_all_cells: 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 Ast Editor. Nothing to install.
execute_all_cells 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 execute_all_cells 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 execute_all_cells. 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.
execute_all_cells is provided by the Ast Editor MCP server (kambleakash0/agent-skills). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ast Editor, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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59 Ast Editor tools catalogued and risk-classified — across an index of 43,000+ MCP servers.