tengu_crypto_universe
The tradeable crypto universe, ranked by 24h dollar volume across the WHOLE book (~419 pairs) in one call. Stablecoins (USDT/USDC/UST...) are excluded — huge volume, no directional tradeability. Call this to get the liquid crypto candidate set instead of a hand-picked list. IMPORTANT: this is a L...
This record as markdown: /tools/tengu-mcp/tengu-crypto-universe.md
What tengu_crypto_universe does on Tengu
AI agents use tengu_crypto_universe to create or update resources in Tengu, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Tengu environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
limit | integer | — | |
min_dollar_volume | number | — |
Parameters from the server's own tool schema.
Why tengu_crypto_universe is rated Medium
An AI agent can call tengu_crypto_universe faster than any human can review: one bad instruction and it creates or modifies resources in Tengu by the hundred, each call as confident as the last.
Attacks that exploit this kind of access
The rule that runs tengu_crypto_universe safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Tengu, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For tengu_crypto_universe, this is the rule to start with:
tengu_crypto_universe 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Tengu, apply this rule, and every tengu_crypto_universe call is checked against it from then on.
Questions about tengu_crypto_universe
The tradeable crypto universe, ranked by 24h dollar volume across the WHOLE book (~419 pairs) in one call. Stablecoins (USDT/USDC/UST...) are excluded — huge volume, no directional tradeability. Call this to get the liquid crypto candidate set instead of a hand-picked list. IMPORTANT: this is a LIQUIDITY ranking, NOT a conviction ranking — rank orders by tradeability, never by expected return. FIRM has no validated crypto edge, so these are candidates by tradeability only; never present rank as a signal. It is categorised as a Write tool in the Tengu MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
tengu_crypto_universe accepts 2 parameters: limit, min_dollar_volume. The full parameter table on this page comes from the server's own tool schema.
Register the Tengu MCP server in PolicyLayer and add a rule for tengu_crypto_universe: 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 Tengu. Nothing to install.
tengu_crypto_universe is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the tengu_crypto_universe 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 tengu_crypto_universe. 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.
tengu_crypto_universe is provided by the Tengu MCP server (Hlobo-dev/tengu-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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