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Subtensor MCP

com.subtensor/referencesubtensor.comstreamable-httpv2.0.0Scanned

Subtensor blockchain reference — events, calls, storage, constants, errors for all 28 active pallets

7 tools: 3 change things and 4 only read.

Tools: 0 delete, 0 irreversible, 3 write, 4 read.
  • Reads private data · 0
  • Reads text others write · 2
  • Can send data out · 0
  • 1 finding

Anlyon alternative

3 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

7 tools

Changes things 3Claude Code: ask
  • subtensor_decodeDecode SCALE-encoded hex into labelled fields with RAO→TAO and hex→SS58 conversions applied.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    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 want to know what they are.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • subtensor_exploreExplore relationships, version history, removed items, changelogs, and migration guides between runtime versions.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Explore relationships, version history, removed items, changelogs, and migration guides between runtime versions.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • subtensor_preferencesGet or set session preferences for language, node URL, and node type.Reads text others write1 finding

    Why it is in this group

    • The description's first verb is "get": a word for reading.
    • The server marks it as not read-only (readOnlyHint: false).

    What it can reach

    • untrusted-inputThe description's first sentence says "get" and "url": it reads web pages, which anyone can write.

    Findings

    • Warn

      The server marks "subtensor_preferences" as not read-only (readOnlyHint: false), and its words say it reads.

      Matched text

      annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The description's first verb is "get": a word for reading.

      What this check looks for
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: false
Only reads 4Show 4 read-only tools
  • subtensor_explainUnderstand Bittensor concepts, workflows, mechanisms, runtime APIs, runtime errors, extrinsic format, or get code examples.No findings

    Why it is in this group

    • The name "subtensor_explain" says "explain": a word for reading.
    Description, as the server wrote it
    Understand Bittensor concepts, workflows, mechanisms, runtime APIs, runtime errors, extrinsic format, or get code examples.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • subtensor_listBrowse items by category: pallets, events, calls, storage, constants, errors, types, runtime APIs, RPC methods, protocol accounts, EVM precompiles, mechanisms, workflows, hyperpara…Reads text others writeNo findings

    Why it is in this group

    • The name "subtensor_list" says "list": a word for reading.

    What it can reach

    • untrusted-inputThe description's first sentence says "browse": it reads web pages, which anyone can write.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • subtensor_lookupGet detailed info about a specific pallet, event, call, storage item, constant, error, SCALE type, RPC method, protocol account, or EVM precompile.No findings

    Why it is in this group

    • The name "subtensor_lookup" says "lookup": a word for reading.
    Description, as the server wrote it
    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.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write2
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnsubtensor_preferences

    The server marks "subtensor_preferences" as not read-only (readOnlyHint: false), and its words say it reads.

    Matched text

    annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false}; The description's first verb is "get": a word for reading.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 2.0.0. Values in angle brackets are yours to fill in.

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__reference__subtensor_search",
      "mcp__reference__subtensor_lookup",
      "mcp__reference__subtensor_list",
      "mcp__reference__subtensor_explain"
    ],
    "ask": [
      "mcp__reference__subtensor_explore",
      "mcp__reference__subtensor_preferences",
      "mcp__reference__subtensor_decode"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as reference. Review it before you use it.

Capability tags behind 2 rules
  • mcp__reference__subtensor_list untrusted-input
  • mcp__reference__subtensor_preferences untrusted-input

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/com.subtensor/reference/verify?hash=26722652780cb8ddc878ae5e3cce5de26ea3dd71c5060d38f068a51e0b90b544" | jq -e '.changed == false'

Pinned hash 26722652780c, from Oct 23, 2026, 00:17 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.subtensor/reference/changes.xml

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Badge

anlyon.dev badge for com.subtensor/reference
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Source: MCP Registry. Synced Oct 23, 2026, 00:17 UTC.