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Bittensor MCP server

Which MCP servers are Bittensor's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-23

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Whose server it is
  • Registry namecom.subtensor/referenceverified in the MCP registry

The registry name sits under subtensor.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-23
  • Stateanswerschecked 2026-10-23
  • Tools7
  • Server calls itselfsubtensor
  • Server version2.0.0
  • Protocol version2025-06-18

On 2026-10-23 the server answered initialize and tools/list without a sign-in. First answer in 354 ms.

Should an agent connect itNot proven either way yet
  • Its tools do look up chain calls, events and storage items, but not subscribe to chain events from code.
  • Checked on 5 of the 7 days it takes to judge reliability.

Once connected

  • For "look up chain calls, events and storage items", the likely first call is subtensor_search.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 5, the first on 2026-10-23
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 5 so far
  • What an agent can do with it1 of 2 use cases
  • Answeredmeasuring5 of the 7 daily checks it takes to print a share
  • Median first answer284 ms
  • Space in an agent's context≈ 2,912 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results7 of 7 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · look up chain calls, events and storage items
  • not sure · connect to the chain and query its storage
  • cannot · subscribe to chain events from code

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers7 tools · read 2026-10-23
  • subtensor_search

    Search across all Subtensor pallets, events, calls, storage, constants, and errors by keyword.

  • subtensor_lookup

    Get detailed info about a specific pallet, event, call, storage item, constant, error, SCALE type, RPC method, protocol account, or EVM precompile. Accepts URN identifiers with optional #field.path drilling.

  • subtensor_list

    Browse items by category: pallets, events, calls, storage, constants, errors, types, runtime APIs, RPC methods, protocol accounts, EVM precompiles, mechanisms, workflows, hyperparameters, cli_flags, build_features, chain_specs, or env_vars.

  • subtensor_explore

    Explore relationships, version history, removed items, changelogs, and migration guides between runtime versions.

  • subtensor_explain

    Understand Bittensor concepts, workflows, mechanisms, runtime APIs, runtime errors, extrinsic format, or get code examples.

  • subtensor_preferences

    Get or set session preferences for language, node URL, and node type. Language affects field name casing (TypeScript=camelCase, others=snake_case) and code examples.

  • subtensor_decode

    Decode SCALE-encoded hex into labelled fields with RAO→TAO and hex→SS58 conversions applied. Omit pallet and name to identify an event or call from its two-byte (pallet index, item index) prefix — the usual case when you have bytes and…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "reference": {
      "type": "http",
      "url": "https://subtensor.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http subtensor https://subtensor.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://subtensor.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.