Enter a BASIC program directly into C64 memory. Takes BASIC source code text, tokenizes it, and writes it to memory at $0801. Updates BASIC pointers so the program is ready to LIST or RUN. Each line must have a line number (e.g.,
AI agents invoke enter_basic_program to trigger actions in Commodore 64 Ultimate Computer MCP Server. 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.
This tool executes code on a target device (Commodore 64) by injecting BASIC programs into memory and preparing them for execution via RUN. While not destructive on its own, it enables arbitrary code execution on the emulated/physical machine, making it an Execute category risk.
From the tool's definition Tool description states it 'Enter[s] a BASIC program directly into C64 memory', 'tokenizes it', and 'writes it to memory'. This involves executing arbitrary BASIC code on the C64 device via direct memory writes and program injection.
Documented attack patterns abuse exactly the kind of access enter_basic_program gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Commodore 64 Ultimate Computer MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for enter_basic_program:
{
"version": "1",
"default": "deny",
"tools": {
"enter_basic_program": {
"limits": [
{
"counter": "enter_basic_program_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}enter_basic_program 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.
Free to start. No card required.
Enter a BASIC program directly into C64 memory. Takes BASIC source code text, tokenizes it, and writes it to memory at $0801. Updates BASIC pointers so the program is ready to LIST or RUN. Each line must have a line number (e.g.,. It is categorised as a Execute tool in the Commodore 64 Ultimate Computer MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Commodore 64 Ultimate Computer MCP Server MCP server in PolicyLayer and add a rule for enter_basic_program: 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 Commodore 64 Ultimate Computer MCP Server. Nothing to install.
enter_basic_program 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 enter_basic_program 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 enter_basic_program. 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.
enter_basic_program is provided by the Commodore 64 Ultimate Computer MCP Server MCP server (xphileby/c64u-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Commodore 64 Ultimate Computer MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
54 Commodore 64 Ultimate Computer MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.