Type text into the C64 keyboard buffer. Converts ASCII to PETSCII and writes to the keyboard buffer at $0277. The C64 will process these keystrokes. Automatically handles text longer than 10 chars by chunking. Use {RETURN} for newline, {CLR} to clear screen, {HOME} for home, {UP}/{DOWN}/{LEFT}/{R...
AI agents invoke type_text 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.
Injecting keystrokes into a machine's keyboard buffer is functionally equivalent to executing arbitrary commands on that machine. An AI agent could type any BASIC or machine-level command (e.g., RUN, LOAD, SYS) causing the C64 to execute programs, modify memory, or perform destructive operations.
From the tool's definition 'Type text into the C64 keyboard buffer... The C64 will process these keystrokes.' Supports RETURN, function keys, and arbitrary text input that the C64 machine will execute as if typed by a user.
Documented attack patterns abuse exactly the kind of access type_text 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 type_text:
{
"version": "1",
"default": "deny",
"tools": {
"type_text": {
"limits": [
{
"counter": "type_text_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}type_text 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.
Type text into the C64 keyboard buffer. Converts ASCII to PETSCII and writes to the keyboard buffer at $0277. The C64 will process these keystrokes. Automatically handles text longer than 10 chars by chunking. Use {RETURN} for newline, {CLR} to clear screen, {HOME} for home, {UP}/{DOWN}/{LEFT}/{RIGHT} for cursor, {F1}-{F8} for function keys, {DEL}/{INS} for delete/insert. 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 type_text: 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.
type_text 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 type_text 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 type_text. 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.
type_text 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.