Tools

Tools

Every tool this server has is a mirror. The catalogue is MCP resources and MCP prompts; these four exist for the clients that implement neither, to which a resource-only server looks empty. n8n's MCP Client Tool is the one that made them necessary.

Each pair is revealed separately, because a client may have one feature and not the other. A client says so on the MCP URL, or in a header that beats the URL:

http://mcp-kb.flow.svc.cluster.local:8000/mcp?resources=off&prompts=off

Tool	Mirrors	Shown by	or by header
list_resources	Resource mirror	?resources=off	X-MCP-Resources: off
read_resource	Resource mirror	?resources=off	X-MCP-Resources: off
list_prompts	Prompt mirror	?prompts=off	X-MCP-Prompts: off
get_prompt	Prompt mirror	?prompts=off	X-MCP-Prompts: off

The vocabulary is deliberately the protocol's own — list addresses, read an address — so an agent that can drive MCP resources can drive these with nothing new to learn. See Installing for where each client wants that URL, and Skills for the skill:// grammar read_resource takes.

list_resources

List the skill resources available, as uri/name/description.

Start here. The listing is indexes, not skills: a skill://<library>/_index.md per library, a skill://<library>/<folder>/_index.md per top-level folder, and a skill://<library>/_files.md for a library that ships files outside its skills. Read an index for the URIs inside it, then read a skill's SKILL.md URI for its instructions. What is listed is what this connection's scope admits: ?library=, ?categories= and ?tags= on the MCP URL narrow it, and that ceiling is not yours to widen.

This returns exactly what an MCP resources/list would, so a uri from here can be read with read_resource or with your own resource reader.

Listed only for a client that sent ?resources=off or X-MCP-Resources: off. It is callable either way — hiding a tool from a listing is a presentation choice, not a refusal to run it.

Arguments

Takes no arguments.

Annotations

Annotation	Value
title	List skill resources
read_only_hint	true
destructive_hint	false
idempotent_hint	true
open_world_hint	false

read_resource

Read one skill:// URI: an index, a skill's file, or a library's file.

Listed only for a client that sent ?resources=off or X-MCP-Resources: off. It is callable either way — hiding a tool from a listing is a presentation choice, not a refusal to run it.

Arguments

Argument	Type	Required	Default	Notes
uri	string	yes	—	A URI from list_resources or an index, or one built from this grammar, where <folder> may be empty or several segments: skill://<library>/_index.md or skill://<library>/<folder>/_index.md for an index of skills, skill://<library>/<folder>/<skill>/SKILL.md for a skill's instructions, skill://<library>/<folder>/<skill>/_manifest for what else it ships, and skill://<library>/<folder>/<skill>/<path> for one of those files, skill://<library>/_files.md for the files a library ships outside its skills, and skill://<library>/<path> for one of those.

Annotations

Annotation	Value
title	Read a skill resource
read_only_hint	true
destructive_hint	false
idempotent_hint	true
open_world_hint	false

list_prompts

List all available prompts.

Returns JSON with prompt metadata including name, description, and optional arguments.

Listed only for a client that sent ?prompts=off or X-MCP-Prompts: off. It is callable either way — hiding a tool from a listing is a presentation choice, not a refusal to run it.

Arguments

Takes no arguments.

Annotations

Annotation	Value
title	List prompts
read_only_hint	true
destructive_hint	false
idempotent_hint	true
open_world_hint	false

get_prompt

Get a prompt by name with optional arguments.

Returns the rendered prompt as JSON with a messages array. Arguments should be provided as a dict mapping argument names to values.

Listed only for a client that sent ?prompts=off or X-MCP-Prompts: off. It is callable either way — hiding a tool from a listing is a presentation choice, not a refusal to run it.

Arguments

Argument	Type	Required	Default	Notes
name	string	yes	—	The name of the prompt to get
arguments	object	no	—	Optional arguments for the prompt

Annotations

Annotation	Value
title	Get a prompt
read_only_hint	true
destructive_hint	false
idempotent_hint	true
open_world_hint	false

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