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McpService

@webda/mcp

Class: McpService<T>

Defined in: packages/mcp/src/mcpservice.service.ts:150

MCP transport: exposes operations as Model Context Protocol tools and models as resources, over Streamable HTTP (a Webda route) and stdio (webda mcp).

Webda Modda​

Extends​

  • OperationsTransport<T>

Type Parameters​

T​

T extends McpServiceParameters = McpServiceParameters

Constructors​

Constructor​

new McpService<T>(name, params): McpService<T>

Defined in: packages/core/lib/services/service.d.ts:72

Service

Parameters​

name​

string

The name of the service

params​

T

The parameters block define in the configuration file

Returns​

McpService<T>

Inherited from​

OperationsTransport<T>.constructor

Properties​

_compiledCapabilities​

protected _compiledCapabilities: Record<string, any>

Defined in: packages/core/lib/services/iservice.d.ts:39

Capabilities detected at compile-time from @WebdaCapability-tagged interfaces.

Populated during Service.resolve by reading the service's entry in webda.module.json. Each key is a capability name (e.g., "request-filter"), and the value is an empty object {} by default. Override getCapabilities to provide capability-specific configuration or to conditionally disable capabilities.

See​

getCapabilities

Inherited from​

OperationsTransport._compiledCapabilities

[WEBDA_EVENTS]​

[WEBDA_EVENTS]: object

Defined in: packages/core/lib/services/service.d.ts:50

Set the Webda events here

Inherited from​

OperationsTransport.[WEBDA_EVENTS]

authenticator​

protected authenticator: McpAuthenticator

Defined in: packages/mcp/src/mcpservice.service.ts:155

evictTimer?​

protected optional evictTimer?: Timeout

Defined in: packages/mcp/src/mcpservice.service.ts:156

fingerprint​

protected fingerprint: string = ""

Defined in: packages/mcp/src/mcpservice.service.ts:154

logger​

protected logger: Logger

Defined in: packages/core/lib/services/service.d.ts:59

Logger with class context

Inherited from​

OperationsTransport.logger

metrics?​

protected optional metrics?: object

Defined in: packages/core/lib/services/service.d.ts:63

Get metrics

Inherited from​

OperationsTransport.metrics

name​

readonly name: string

Defined in: packages/core/lib/services/iservice.d.ts:19

Inherited from​

OperationsTransport.name

parameters​

readonly parameters: T

Defined in: packages/core/lib/services/iservice.d.ts:20

Inherited from​

OperationsTransport.parameters

resourceRegistry?​

protected optional resourceRegistry?: ResourceRegistry

Defined in: packages/mcp/src/mcpservice.service.ts:152

sessions​

protected sessions: McpSessionManager

Defined in: packages/mcp/src/mcpservice.service.ts:153

stdioServers​

protected stdioServers: Server<{ method: string; params?: {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }; }, { method: string; params?: {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }; }, {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }>[] = []

Defined in: packages/mcp/src/mcpservice.service.ts:157

tools​

protected tools: ToolRegistry

Defined in: packages/mcp/src/mcpservice.service.ts:151

filterConfiguration?​

static optional filterConfiguration?: (params) => any

Defined in: packages/core/lib/services/iservice.d.ts:28

Create configuration set by the application on load

Parameters​

params​

any

Returns​

any

Inherited from​

OperationsTransport.filterConfiguration

Parameters​

static Parameters: typeof ServiceParameters

Defined in: packages/core/lib/services/service.d.ts:46

Service parameters

Inherited from​

OperationsTransport.Parameters

Methods​

__clean()​

abstract __clean(): Promise<void>

Defined in: packages/core/lib/services/service.d.ts:215

Clean the service data, can only be used in test mode

Returns​

Promise<void>

Inherited from​

OperationsTransport.__clean

addListener()​

addListener<Key>(eventName, listener): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:80

Type Parameters​

Key​

Key extends never

Parameters​

eventName​

Key

the event name

listener​

(event) => void | Promise<void>

the event listener

Returns​

this

this for chaining

See​

EventEmitter.addListener

Inherited from​

OperationsTransport.addListener

addRoute()​

protected addRoute(url, methods, executer, openapi?, override?): void

Defined in: packages/core/lib/services/service.d.ts:177

Add a route dynamicaly

Parameters​

url​

string

of the route can contains dynamic part like {uuid}

methods​

HttpMethodType[]

the HTTP methods

executer​

Function

Method to execute for this route

openapi?​

OpenAPIWebdaDefinition

the OpenAPI specification

override?​

boolean

whether to override existing

Returns​

void

Inherited from​

OperationsTransport.addRoute

authorizeClientEvent()​

authorizeClientEvent(_event, _context): boolean

Defined in: packages/core/lib/services/service.d.ts:153

Authorize a public event subscription

Parameters​

_event​

string

the event name

_context​

OperationContext

the execution context

Returns​

boolean

true if the condition is met

Inherited from​

OperationsTransport.authorizeClientEvent

checkForChanges()​

checkForChanges(): void

Defined in: packages/mcp/src/mcpservice.service.ts:240

Detect runtime operation registration and notify open sessions

Returns​

void

computeParameters()​

computeParameters(): void

Defined in: packages/core/lib/services/service.d.ts:77

Used to compute or derivate input parameter to attribute

Returns​

void

Deprecated​

Inherited from​

OperationsTransport.computeParameters

createHttpSession()​

protected createHttpSession(ctx, userId, requestOrigin?): Promise<McpSessionEntry>

Defined in: packages/mcp/src/mcpservice.service.ts:378

Create an SDK server + transport pair for a new MCP session

Parameters​

ctx​

WebContext

the initializing request

userId​

string

caller user id

requestOrigin?​

URL = ...

origin of the request (see requestOrigin)

Returns​

Promise<McpSessionEntry>

the (not yet registered) session entry; it registers on initialize

createServer()​

createServer(getSession): Server

Defined in: packages/mcp/src/mcpservice.service.ts:254

Parameters​

getSession​

(extra) => Session

caller session resolution

Returns​

Server

a new SDK server over this service's registries

emit()​

emit<Key>(event, data): Promise<void>

Defined in: packages/core/lib/services/service.d.ts:204

Emit the event with data and wait for Promise to finish if listener returned a Promise

Type Parameters​

Key​

Key extends never

Parameters​

event​

Key

the event name

data​

object[Key]

the data to process

Returns​

Promise<void>

Inherited from​

OperationsTransport.emit

exposeOperation()​

exposeOperation(_operationId, _definition): void

Defined in: packages/mcp/src/mcpservice.service.ts:175

Tools are built in bulk by refreshRegistries

Parameters​

_operationId​

string

unused

_definition​

OperationDefinition

unused

Returns​

void

Overrides​

OperationsTransport.exposeOperation

getCapabilities()​

getCapabilities(): Record<string, any>

Defined in: packages/core/lib/services/iservice.d.ts:61

Return the capabilities of this service.

By default returns capabilities detected at compile-time from

Returns​

Record<string, any>

the result

Webda Capability-tagged​

interfaces in webda.module.json.

Override to disable capabilities based on configuration:

getCapabilities() {
  const caps = super.getCapabilities();
  if (!this.parameters.enabled) delete caps["request-filter"];
  return caps;
}

Inherited from​

OperationsTransport.getCapabilities

getClientEvents()​

getClientEvents(): string[]

Defined in: packages/core/lib/services/service.d.ts:144

Return the events that an external system can subscribe to

Returns​

string[]

the list of results

Inherited from​

OperationsTransport.getClientEvents

getMaxListeners()​

getMaxListeners(): number

Defined in: packages/core/lib/events/asynceventemitter.d.ts:84

Returns​

number

Inherited from​

OperationsTransport.getMaxListeners

getMetric()​

getMetric<T>(type, configuration): T

Defined in: packages/core/lib/services/service.d.ts:138

Add service name label

Type Parameters​

T​

T = Gauge<string> | Counter<string> | Histogram<string>

Parameters​

type​

CustomConstructor<T, [MetricConfiguration<T>]>

the type to look up

configuration​

MetricConfiguration<T>

the configuration

Returns​

T

the result

Inherited from​

OperationsTransport.getMetric

getName()​

getName(): string

Defined in: packages/core/lib/services/service.d.ts:209

Get service name

Returns​

string

the result string

Inherited from​

OperationsTransport.getName

getOpenApiReplacements()​

getOpenApiReplacements(): any

Defined in: packages/core/lib/services/service.d.ts:182

Return variables for replacement in openapi

Returns​

any

the result

Inherited from​

OperationsTransport.getOpenApiReplacements

getOperationId()​

getOperationId(id): string

Defined in: packages/core/lib/services/service.d.ts:167

If undefined is returned it cancel the operation registration

Parameters​

id​

string

the identifier

Returns​

string

the result

Inherited from​

OperationsTransport.getOperationId

getOperations()​

getOperations(): Record<string, OperationDefinition>

Defined in: packages/core/lib/services/operationstransport.d.ts:48

Get all registered operations, filtered by this transport's include/exclude config

Returns​

Record<string, OperationDefinition>

filtered map of operation id to definition

Inherited from​

OperationsTransport.getOperations

getParameters()​

getParameters(): T

Defined in: packages/core/lib/services/service.d.ts:82

Get the service parameters

Returns​

T

the result

Inherited from​

OperationsTransport.getParameters

getService()​

getService<T>(name): ServicesMap[T]

Defined in: packages/core/lib/services/service.d.ts:131

Get a service by name

Type Parameters​

T​

T extends keyof ServicesMap

Parameters​

name​

T

the name to use

Returns​

ServicesMap[T]

the result map

Deprecated​

Use useService, might reconsider

Inherited from​

OperationsTransport.getService

getState()​

getState(): ServiceStates

Defined in: packages/core/lib/services/service.d.ts:55

Get the current state

Returns​

ServiceStates

the result

Inherited from​

OperationsTransport.getState

getUrl()​

getUrl(url, _methods): string

Defined in: packages/core/lib/services/service.d.ts:161

Return the full path url based on parameters

Parameters​

url​

string

relative url to service

_methods​

HttpMethodType[]

in case we need filtering (like Store)

Returns​

string

absolute url or undefined if need to skip the Route

Inherited from​

OperationsTransport.getUrl

handleHttp()​

handleHttp(ctx): Promise<void>

Defined in: packages/mcp/src/mcpservice.service.ts:313

Handle GET/POST/DELETE on the MCP endpoint

Parameters​

ctx​

WebContext

the request context

Returns​

Promise<void>

init()​

init(): Promise<McpService<T>>

Defined in: packages/mcp/src/mcpservice.service.ts:198

Build registries, mount the HTTP route and start session eviction

Returns​

Promise<McpService<T>>

this

Overrides​

OperationsTransport.init

initMetrics()​

initMetrics(): void

Defined in: packages/core/lib/services/service.d.ts:124

Init the metrics

Returns​

void

Inherited from​

OperationsTransport.initMetrics

initOperations()​

initOperations(): void

Defined in: packages/core/lib/services/service.d.ts:186

Init the operations from

Returns​

void

Operation​

decorators on this service

Inherited from​

OperationsTransport.initOperations

initTransport()​

protected initTransport(): void

Defined in: packages/core/lib/services/operationstransport.d.ts:57

Walk the filtered operations and call exposeOperation for each non-hidden one

Returns​

void

Inherited from​

OperationsTransport.initTransport

isHostAllowed()​

protected isHostAllowed(ctx): boolean

Defined in: packages/mcp/src/mcpservice.service.ts:296

DNS-rebinding guard: the request hostname must be in allowedHosts

Parameters​

ctx​

WebContext

the request context

Returns​

boolean

true when the host is accepted

listeners()​

listeners(eventName): Function[]

Defined in: packages/core/lib/events/asynceventemitter.d.ts:139

Get all listeners for an event

Parameters​

eventName​

never

the event name

Returns​

Function[]

the list of results

Inherited from​

OperationsTransport.listeners

loadCapabilities()​

protected loadCapabilities(): void

Defined in: packages/core/lib/services/service.d.ts:120

Load capabilities from webda.module.json metadata into _compiledCapabilities.

Called during resolve after dependency injection. Reads the service's type name from parameters, looks it up in the application's module metadata (moddas or beans section), and populates _compiledCapabilities with an empty object for each declared capability name.

Fails silently if the application is not available (e.g., in unit tests where services are instantiated without a full application context).

Returns​

void

Example​

// If webda.module.json contains:
// { "moddas": { "MyApp/HawkService": { "capabilities": ["request-filter", "cors-filter"] } } }
// Then after resolve(), this.getCapabilities() returns:
// { "request-filter": {}, "cors-filter": {} }

See​

getCapabilities

Inherited from​

OperationsTransport.loadCapabilities

log()​

log(level, ...args): void

Defined in: packages/core/lib/services/service.d.ts:226

Parameters​

level​

WorkerLogLevel

to log

args​

...any[]

additional arguments

Returns​

void

Inherited from​

OperationsTransport.log

mcp()​

mcp(user?): Promise<void>

Defined in: packages/mcp/src/mcpservice.service.ts:410

Serve the MCP tools over stdio until stdin closes

Anyone able to start this command acts with user's permissions (or anonymous permissions when no user is given).

Parameters​

user?​

string = ""

user id whose permissions apply

Returns​

Promise<void>

off()​

off<Key>(eventName, listener): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:116

Type Parameters​

Key​

Key extends never

Parameters​

eventName​

Key

the event name

listener​

(event) => void

the event listener

Returns​

this

this for chaining

See​

EventEmitter.off

Inherited from​

OperationsTransport.off

on()​

on<Key>(eventName, listener): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:102

Type Parameters​

Key​

Key extends never

Parameters​

eventName​

Key

the event name

listener​

(event) => void

the event listener

Returns​

this

this for chaining

See​

EventEmitter.once

Inherited from​

OperationsTransport.on

once()​

once<Key>(eventName, listener): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:95

Type Parameters​

Key​

Key extends never

Parameters​

eventName​

Key

the event name

listener​

(event) => void

the event listener

Returns​

this

this for chaining

See​

EventEmitter.once

Inherited from​

OperationsTransport.once

refreshRegistries()​

refreshRegistries(): boolean

Defined in: packages/mcp/src/mcpservice.service.ts:225

Rebuild tool and resource registries when operations changed

Returns​

boolean

true when they were rebuilt

removeAllListeners()​

removeAllListeners<Key>(eventName?): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:122

Type Parameters​

Key​

Key extends never

Parameters​

eventName?​

Key

the event name

Returns​

this

this for chaining

See​

EventEmitter.removeAllListeners

Inherited from​

OperationsTransport.removeAllListeners

removeListener()​

removeListener<Key>(eventName, listener): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:109

Type Parameters​

Key​

Key extends never

Parameters​

eventName​

Key

the event name

listener​

(event) => void

the event listener

Returns​

this

this for chaining

See​

EventEmitter.removeListener

Inherited from​

OperationsTransport.removeListener

requestOrigin()​

protected requestOrigin(ctx): URL

Defined in: packages/mcp/src/mcpservice.service.ts:277

Origin (protocol + host[:port]) of a request, from the x-forwarded-host header when present (HttpServer rejects forwarded headers from untrusted sources) or the host header. Parsed here rather than via HttpContext.getAbsoluteUrl, which cannot represent IPv6 literals like [::1]:18080.

Parameters​

ctx​

WebContext

the request context

Returns​

URL

the parsed origin, or undefined when the host is missing or invalid

resolve()​

resolve(): this

Defined in: packages/mcp/src/mcpservice.service.ts:180

Returns​

this

this once the authenticator is resolved

Overrides​

OperationsTransport.resolve

serveStdio()​

serveStdio(transport, user?): Promise<Server<{ method: string; params?: {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }; }, { method: string; params?: {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }; }, {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }>>

Defined in: packages/mcp/src/mcpservice.service.ts:430

Connect a new MCP server to a transport, acting as user

Parameters​

transport​

Transport

stdio (or any) transport

user?​

string

user id whose permissions apply; anonymous when empty

Returns​

Promise<Server<{ method: string; params?: {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }; }, { method: string; params?: {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }; }, {[key: string]: unknown; _meta?: {[key: string]: unknown; io.modelcontextprotocol/related-task?: { taskId: string; }; progressToken?: string | number; }; }>>

the connected server

setMaxListeners()​

setMaxListeners(n): this

Defined in: packages/core/lib/events/asynceventemitter.d.ts:88

Parameters​

n​

number

Returns​

this

Inherited from​

OperationsTransport.setMaxListeners

stop()​

stop(): Promise<void>

Defined in: packages/mcp/src/mcpservice.service.ts:448

Stop eviction and close every MCP session

Returns​

Promise<void>

Overrides​

OperationsTransport.stop

toJSON()​

toJSON(): string

Defined in: packages/core/lib/services/service.d.ts:191

Prevent service to be serialized

Returns​

string

the result

Inherited from​

OperationsTransport.toJSON

toString()​

toString(): string

Defined in: packages/core/lib/services/service.d.ts:91

Return service representation

Returns​

string

the result

Inherited from​

OperationsTransport.toString

createConfiguration()​

static createConfiguration(params?): McpServiceParameters

Defined in: packages/mcp/src/mcpservice.service.ts:166

Build typed parameters with defaults. Application replaces this with the webda.module.json Configuration class (the same McpServiceParameters); it is defined here so the service also works when registered by hand.

Parameters​

params?​

any = {}

raw parameters

Returns​

McpServiceParameters

typed parameters

Overrides​

OperationsTransport.createConfiguration