set_custom_strategy

Create a custom trading strategy with your own conditions. Then use evaluate_strategy to test it against current market conditions.

SERVERFathom Fyi SOURCE0xhashy/fathom-fyi

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/0xhashy-fathom-fyi/set-custom-strategy.md

WHAT IT DOES

What set_custom_strategy does on Fathom Fyi

AI agents use set_custom_strategy to create or update resources in Fathom Fyi, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Fathom Fyi environment.

RISK

Why set_custom_strategy is rated Medium

This tool creates and stores user-defined trading strategy objects, which is a reversible write operation. While it does not directly execute trades or move funds, it establishes financial configurations that will likely be evaluated by evaluate_strategy and potentially executed by other tools.

From the tool's definition Tool name 'set_custom_strategy' and description 'Create a custom trading strategy' explicitly indicate creation and persistence of new strategy configurations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs set_custom_strategy safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Fathom Fyi, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For set_custom_strategy, this is the rule to start with:

set_custom_strategy Rate-limited

set_custom_strategy stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_custom_strategy": {
      "limits": [
        {
          "counter": "set_custom_strategy_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Fathom Fyi, apply this rule, and every set_custom_strategy call is checked against it from then on.

FAQ

Questions about set_custom_strategy

What does the set_custom_strategy tool do? +

Create a custom trading strategy with your own conditions. Then use evaluate_strategy to test it against current market conditions. It is categorised as a Write tool in the Fathom Fyi MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_custom_strategy? +

Register the Fathom Fyi MCP server in PolicyLayer and add a rule for set_custom_strategy: 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 Fathom Fyi. Nothing to install.

What risk level is set_custom_strategy? +

set_custom_strategy is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_custom_strategy? +

Yes. Add a rate_limit block to the set_custom_strategy 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.

How do I block set_custom_strategy completely? +

Set action: deny in the PolicyLayer policy for set_custom_strategy. 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.

What MCP server provides set_custom_strategy? +

set_custom_strategy is provided by the Fathom Fyi MCP server (0xhashy/fathom-fyi). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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