mp_wire_rpc
Insert (or replace) an @rpc(...) annotation above a function in an existing GDScript, so it can be called across the network. If the function does not exist, a stub is appended carrying the annotation. Operates on the on-disk file (save the script in the editor first if it has unsaved changes). D...
This record as markdown: /tools/breakpoint-mcp/mp-wire-rpc.md
What mp_wire_rpc does on Breakpoint
AI agents call mp_wire_rpc to permanently remove resources in Breakpoint, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
| Parameter | Type | Required | Description |
|---|---|---|---|
mode | string | — | Who may call it: 'authority' (default) or 'any_peer' |
path | string | Yes | res:// .gd script to modify |
channel | integer | — | Transfer channel (default 0) |
confirm | boolean | — | Auto-approve this destructive action (skip the confirmation prompt) |
function | string | Yes | Function name to annotate (a stub is created if absent) |
call_local | boolean | — | Also invoke locally on the caller (default false → call_remote) |
transfer_mode | string | — | Transfer mode: 'unreliable' (default), 'unreliable_ordered', or 'reliable' |
Parameters from the server's own tool schema.
Why mp_wire_rpc is rated Critical
The tool explicitly labels itself as DESTRUCTIVE and rewrites the on-disk .gd file, overwriting the existing file content with no mention of backup or rollback capability. This is an irreversible file modification that could destroy existing code if misused.
From the tool's definition DESTRUCTIVE (rewrites the .gd file) — gated. Operates on the on-disk file
Risk signalsAccepts file system path (path)
Attacks that exploit this kind of access
The rule that runs mp_wire_rpc safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For mp_wire_rpc, this is the rule to start with:
mp_wire_rpc is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Breakpoint, apply this rule, and every mp_wire_rpc call is checked against it from then on.
Questions about mp_wire_rpc
Insert (or replace) an @rpc(...) annotation above a function in an existing GDScript, so it can be called across the network. If the function does not exist, a stub is appended carrying the annotation. Operates on the on-disk file (save the script in the editor first if it has unsaved changes). DESTRUCTIVE (rewrites the .gd file) — gated. It is categorised as a Destructive tool in the Breakpoint MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
mp_wire_rpc accepts 7 parameters: mode, path, channel, confirm, function, call_local, transfer_mode. Required: path, function. The full parameter table on this page comes from the server's own tool schema.
Register the Breakpoint MCP server in PolicyLayer and add a rule for mp_wire_rpc: 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 Breakpoint. Nothing to install.
mp_wire_rpc is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the mp_wire_rpc 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 mp_wire_rpc. 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.
mp_wire_rpc is provided by the Breakpoint MCP server (breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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