Find the cheapest prop firm challenges based on discount percentage. Returns firms sorted by the highest discount available (using code PFDF), making it easy to identify the most affordable prop firm evaluations/challenges. Args: - category ('futures' | 'forex' | 'multi-asset' | 'all'): Filte...
Part of the Prop Firm Deal Finder MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call pfdf_find_cheapest to retrieve information from Prop Firm Deal Finder without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though pfdf_find_cheapest only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
pfdf_find_cheapest:
rules:
- action: allowSee the full Prop Firm Deal Finder policy for all 6 tools.
Agents calling read-class tools like pfdf_find_cheapest have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Find the cheapest prop firm challenges based on discount percentage. Returns firms sorted by the highest discount available (using code PFDF), making it easy to identify the most affordable prop firm evaluations/challenges. Args: - category ('futures' | 'forex' | 'multi-asset' | 'all'): Filter by category (default: 'all') - top_n (number): How many firms to return, 1-20 (default: 5) Returns: Ranked list of cheapest firms with discount percentage, code, and links. Examples: - "What's the cheapest prop firm?" → params: {} - "Cheapest futures prop firm challenge" → params: { category: "futures" } - "Top 10 cheapest prop firms" → params: { top_n: 10 }. It is categorised as a Read tool in the Prop Firm Deal Finder MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for pfdf_find_cheapest. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Prop Firm Deal Finder MCP server.
pfdf_find_cheapest is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the pfdf_find_cheapest rule in your Intercept 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 Intercept policy for pfdf_find_cheapest. 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.
pfdf_find_cheapest is provided by the Prop Firm Deal Finder MCP server (propfirmdealfinder-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept