get_chain_context

SERVERFathom Fyi SOURCE0xhashy/fathom-fyi

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/0xhashy-fathom-fyi/get-chain-context.md

WHAT IT DOES

What get_chain_context does on Fathom Fyi

AI agents call get_chain_context to retrieve information from Fathom Fyi without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_chain_context is rated Low

This is a pure data retrieval tool that queries and returns blockchain analytics without side effects. It gathers intelligence to inform financial decisions but does not execute trades, modify data, or move funds. The blast radius of misuse is limited to poor decision-making based on stale or misinterpreted data, not direct financial harm or irreversible actions.

From the tool's definition Tool retrieves DeFi context data (TVL, dominance, trend, top protocols, market share status) for specified blockchains. No modification, deletion, or execution of transactions.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_chain_context 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 get_chain_context, this is the rule to start with:

get_chain_context Allowed

get_chain_context is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_chain_context": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about get_chain_context

What does the get_chain_context tool do? +

Get DeFi context for a specific blockchain: TVL, dominance, trend, top protocols, and whether the chain is gaining or losing market share. Supports: ethereum, solana, base, arbitrum, optimism, polygon, avalanche, bsc, tron, bitcoin. It is categorised as a Read tool in the Fathom Fyi MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_chain_context? +

Register the Fathom Fyi MCP server in PolicyLayer and add a rule for get_chain_context: 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 get_chain_context? +

get_chain_context is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_chain_context? +

Yes. Add a rate_limit block to the get_chain_context 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 get_chain_context completely? +

Set action: deny in the PolicyLayer policy for get_chain_context. 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 get_chain_context? +

get_chain_context 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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