Arcane Synthesis for improvised magic. Caster proposes a custom spell effect; Arcana check DC = 10 + (level × 2) + modifiers. Success creates temporary spell effect, failure may cause mishaps. Supports circumstance modifiers (ley lines, desperation, material components).
AI agents invoke synthesize_spell to trigger actions in ChatRPG. 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 a game mechanic operation: it evaluates an Arcana check, resolves success/failure conditions, and produces dynamic in-game effects (temporary spell or mishap). It does not simply read data or write a static record — it triggers a conditional process whose outcome depends on inputs.
From the tool's definition 'Arcane Synthesis for improvised magic', 'Success creates temporary spell effect, failure may cause mishaps' — triggers an external operation (spell effect resolution) with variable outcomes depending on arguments
Attacks that exploit this kind of access
Arcane Synthesis for improvised magic. Caster proposes a custom spell effect; Arcana check DC = 10 + (level × 2) + modifiers. Success creates temporary spell effect, failure may cause mishaps. Supports circumstance modifiers (ley lines, desperation, material components). It is categorised as a Execute tool in the ChatRPG MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the ChatRPG MCP server in PolicyLayer and add a rule for synthesize_spell: 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 ChatRPG. Nothing to install.
synthesize_spell 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 synthesize_spell 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 synthesize_spell. 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.
synthesize_spell is provided by the ChatRPG MCP server (mnehmos/mnehmos.chatrpg.game). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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