Subtensor MCP

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

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Status: Healthy
Last Tested: 2026-10-23 02:55
Transport: Streamable HTTP · MCP 2025-11-25
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Available Tools

7 tools

subtensor_decodeDecode SCALE data

Read-onlyIdempotent

Inspect

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.

ParametersJSON Schema

Name	Required	Description
`hex`	Yes	SCALE-encoded bytes as hex, with or without a 0x prefix. Whitespace is ignored.
`kind`	No	What the bytes are: 'event' (default), 'call', or 'value' for a bare value of a given type
`name`	No	Event or call name. Must be given together with "pallet".
`type`	No	For kind="value": the SCALE type to decode against, e.g. "u64", "AccountId", "Vec<u16>", "Option<u32>"
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`pallet`	No	Pallet of the event or call. Omit together with "name" to identify the item from the byte prefix instead.

Output Schema

ParametersJSON Schema

Name	Required	Description
`kind`	Yes
`input`	Yes
`fields`	Yes
`trailing_bytes`	Yes

subtensor_explainExplain Subtensor concepts

Read-onlyIdempotent

Inspect

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

ParametersJSON Schema

Name	Required	Description
`name`	No	Topic-specific name: concept name ('staking'), workflow ID ('add-stake'), mechanism ID ('yuma-consensus'), runtime API name ('NeuronInfoRuntimeApi'), or item name for examples
`topic`	Yes	What to explain
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`pallet`	No	Pallet name — required for examples (e.g., 'SubtensorModule')
`language`	No	For examples: filter to one language (overrides session preference)
`node_url`	No	For examples: WebSocket endpoint override
`enum_slug`	No	For runtime_errors: get a specific error enum
`item_type`	No	For examples: type of item to generate code for
`node_type`	No	For examples: 'lite' (current state) or 'archive' (historical patterns)
`preferences`	No	Preferences handle from subtensor_preferences(action="set"). Carries language/node_url/node_type without a session. Explicit arguments on this call take precedence over the handle.

Output Schema

ParametersJSON Schema

Name	Required	Description
No output parameters

subtensor_exploreExplore relationships and changelogs

Read-onlyIdempotent

Inspect

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

ParametersJSON Schema

Name	Required	Description
`name`	No	Item name (e.g., 'StakeAdded', 'add_stake', 'TotalStake')
`type`	No	Item type — for relationships (event/call/storage/error), for removed (all/pallet/event/call/storage/constant/error)
`limit`	No	Max items per page (default: 10)
`topic`	Yes	What to explore
`cursor`	No	Pagination cursor from previous response
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`pallet`	No	Pallet name (e.g., 'SubtensorModule')
`version`	No	For versions: look up a specific version
`to_version`	No	For changelog/migration: end version
`from_version`	No	For changelog/migration: start version

Output Schema

ParametersJSON Schema

Name	Required	Description
`topic`	Yes	Explore topic, mirrors the request topic

subtensor_listList Subtensor items

Read-onlyIdempotent

Inspect

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.

ParametersJSON Schema

Name	Required	Description
`kind`	No	For types: filter by type kind
`role`	No	Filter calls by required role (only applies when category=calls)
`limit`	No	Max items per page (default: 10)
`cursor`	No	Pagination cursor from previous response
`domain`	No	For mechanisms: filter by domain
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`pallet`	No	Pallet name — required for events/calls/storage/constants/errors (e.g., 'SubtensorModule'). For category='rpc_methods' this filters by RPC namespace instead (e.g., 'state', 'subtensor').
`search`	No	For types: search by name
`context`	No	For cli_flags/build_features: filter by usage context
`category`	Yes	Category of items to list
`flag_category`	No	For cli_flags: filter by flag category (chain, sync, networking, rpc, metrics, runtime, subtensor)
`include_removed`	No	Include removed/historical items (default: false)

Output Schema

ParametersJSON Schema

Name	Required	Description
`category`	Yes	Item category, mirrors the request category

subtensor_lookupLook up Subtensor item

Read-onlyIdempotent

Inspect

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.

ParametersJSON Schema

Name	Required	Description
`sub`	No	For type="account": derive a sub-account. A number is a netuid or crowdloan id; a string is an 8-byte tag such as "beta/esc". Index 0 collapses onto the base address.
`urn`	No	URN identifier (e.g., 'subtensor:event:SubtensorModule.StakeAdded', 'subtensor:storage:System.Account#data.free', 'subtensor:api:SwapRuntimeApi.sim_swap_tao_for_alpha', 'subtensor:account:SubtensorModule.SubtensorPalletId#64', 'subtensor:precompile:StakingV2'). `subtensor:runtime_api:...` is accepted as an alias for `subtensor:api:...`. Supports field-path drilling with # for event/call/storage/type items (for account items, #fragment is a sub-index instead). Alternative to type+pallet+name. Takes precedence if both provided.
`name`	No	Item name (e.g., 'SubtensorModule', 'StakeAdded', 'add_stake', 'AccountId32', 'pruning', 'pow-faucet') or type ID number. For type="account": the declaring key ('SubtensorModule.SubtensorPalletId'). For type="precompile": a name ('StakingV2') or 0x address.
`type`	No	What kind of item to look up
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`pallet`	No	Pallet name — required for event/call/storage/constant/error lookups (e.g., 'SubtensorModule')
`address`	No	For type="account": an SS58 address to identify. Returns which protocol account it is, including the sub-index, or reports that it is an ordinary wallet.
`include`	No	For pallet lookup: filter to a specific item type with descriptions
`language`	No	Field name casing for your language. TypeScript shows camelCase (tickLow), others show snake_case (tick_low). Overrides session preference.
`preferences`	No	Preferences handle from subtensor_preferences(action="set"). Carries language/node_url/node_type without a session. Explicit arguments on this call take precedence over the handle.
`include_history`	No	Include full argument signatures for each version range (events/calls only)
`include_removed`	No	Include removed/historical items (default: false)

Output Schema

ParametersJSON Schema

Name	Required	Description
`name`	Yes
`type`	Yes	Item kind, mirrors the request type
`pallet`	No

subtensor_preferencesSession preferencesInspect

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.

ParametersJSON Schema

Name	Required	Description
`action`	No	Action to perform (default: 'get')
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`language`	No	For set: preferred language. Affects field name casing in lookups (TypeScript=camelCase, others=snake_case) and code examples.
`node_url`	No	For set: WebSocket endpoint for generated code
`node_type`	No	For set: 'lite' (current state) or 'archive' (historical patterns)
`preferences`	No	Preferences handle from subtensor_preferences(action="set"). Carries language/node_url/node_type without a session. Explicit arguments on this call take precedence over the handle.

Output Schema

ParametersJSON Schema

Name	Required	Description
`language`	No
`node_url`	No
`node_type`	Yes
`preferences_handle`	Yes	Pass back as `preferences` on later calls to reapply these.

subtensor_searchSearch Subtensor

Read-onlyIdempotent

Inspect

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

ParametersJSON Schema

Name	Required	Description
`type`	No	Filter by item type (default: all)
`limit`	No	Max results per page (default: 10, max: 50)
`query`	Yes	Search query (e.g., 'stake', 'neuron', 'emission')
`cursor`	No	Pagination cursor from previous response
`format`	No	Response format: 'text' (compact, default) or 'json' (structured)
`status`	No	Filter by item status (default: 'active')

Output Schema

ParametersJSON Schema

Name	Required	Description
`query`	Yes
`total`	Yes
`results`	Yes
`nextCursor`	No
`_removed_hint`	No
`status_filter`	Yes
`removed_hidden`	No

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

7 tool updatesOct 23, 2026
- First observedsubtensor_decode
- First observedsubtensor_explain
- First observedsubtensor_explore
- First observedsubtensor_list
- First observedsubtensor_lookup
- First observedsubtensor_preferences
- First observedsubtensor_search

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