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MCP TypeScript SDK (V2) / @modelcontextprotocol/server / ext/skills/errors

ext/skills/errors ​

Classes ​

SkillCatalogError ​

Defined in: packages/server/src/ext/skills/errors.ts:9

Thrown when a skill catalog cannot be built: storage failures always, skill problems under strict. Branded, so instanceof also matches an instance from another bundled copy of the SDK.

Extends ​

  • Error

Constructors ​

Constructor ​

new SkillCatalogError(problems): SkillCatalogError

Defined in: packages/server/src/ext/skills/errors.ts:35

Parameters ​
problems ​

readonly SkillWarning[]

Returns ​

SkillCatalogError

Overrides ​

Error.constructor

Properties ​

cause? ​

optional cause?: unknown

Defined in: node_modules/.pnpm/typescript@5.9.3/node_modules/typescript/lib/lib.es2022.error.d.ts:26

Inherited from ​

Error.cause

message ​

message: string

Defined in: node_modules/.pnpm/typescript@5.9.3/node_modules/typescript/lib/lib.es5.d.ts:1077

Inherited from ​

Error.message

name ​

name: string

Defined in: node_modules/.pnpm/typescript@5.9.3/node_modules/typescript/lib/lib.es5.d.ts:1076

Inherited from ​

Error.name

problems ​

readonly problems: readonly SkillWarning[]

Defined in: packages/server/src/ext/skills/errors.ts:33

stack? ​

optional stack?: string

Defined in: node_modules/.pnpm/typescript@5.9.3/node_modules/typescript/lib/lib.es5.d.ts:1078

Inherited from ​

Error.stack

stackTraceLimit ​

static stackTraceLimit: number

Defined in: node_modules/.pnpm/@types+node@24.12.0/node_modules/@types/node/globals.d.ts:68

The Error.stackTraceLimit property specifies the number of stack frames collected by a stack trace (whether generated by new Error().stack or Error.captureStackTrace(obj)).

The default value is 10 but may be set to any valid JavaScript number. Changes will affect any stack trace captured after the value has been changed.

If set to a non-number value, or set to a negative number, stack traces will not capture any frames.

Inherited from ​

Error.stackTraceLimit

Methods ​

[hasInstance]() ​

static [hasInstance](value): boolean

Defined in: packages/server/src/ext/skills/errors.ts:14

Parameters ​
value ​

unknown

Returns ​

boolean

captureStackTrace() ​

static captureStackTrace(targetObject, constructorOpt?): void

Defined in: node_modules/.pnpm/@types+node@24.12.0/node_modules/@types/node/globals.d.ts:52

Creates a .stack property on targetObject, which when accessed returns a string representing the location in the code at which Error.captureStackTrace() was called.

js
const myObject = {};
Error.captureStackTrace(myObject);
myObject.stack;  // Similar to `new Error().stack`

The first line of the trace will be prefixed with ${myObject.name}: ${myObject.message}.

The optional constructorOpt argument accepts a function. If given, all frames above constructorOpt, including constructorOpt, will be omitted from the generated stack trace.

The constructorOpt argument is useful for hiding implementation details of error generation from the user. For instance:

js
function a() {
  b();
}

function b() {
  c();
}

function c() {
  // Create an error without stack trace to avoid calculating the stack trace twice.
  const { stackTraceLimit } = Error;
  Error.stackTraceLimit = 0;
  const error = new Error();
  Error.stackTraceLimit = stackTraceLimit;

  // Capture the stack trace above function b
  Error.captureStackTrace(error, b); // Neither function c, nor b is included in the stack trace
  throw error;
}

a();
Parameters ​
targetObject ​

object

constructorOpt? ​

Function

Returns ​

void

Inherited from ​

Error.captureStackTrace

isError() ​

static isError(error): error is Error

Defined in: node_modules/.pnpm/typescript@5.9.3/node_modules/typescript/lib/lib.esnext.error.d.ts:23

Indicates whether the argument provided is a built-in Error instance or not.

Parameters ​
error ​

unknown

Returns ​

error is Error

Inherited from ​

Error.isError

isInstance() ​

static isInstance<T>(this, value): value is InstanceType<T>

Defined in: packages/server/src/ext/skills/errors.ts:24

Brand-based type guard: equivalent to value instanceof this, as an explicit static predicate (the axios/AWS-SDK isInstance style). Must be invoked on the class — in callback position write v => SkillCatalogError.isInstance(v), not .filter(SkillCatalogError.isInstance).

Type Parameters ​
T ​

T extends (...args) => unknown

Parameters ​
this ​

T

value ​

unknown

Returns ​

value is InstanceType<T>

prepareStackTrace() ​

static prepareStackTrace(err, stackTraces): any

Defined in: node_modules/.pnpm/@types+node@24.12.0/node_modules/@types/node/globals.d.ts:56

Parameters ​
err ​

Error

stackTraces ​

CallSite[]

Returns ​

any

See ​

https://v8.dev/docs/stack-trace-api#customizing-stack-traces

Inherited from ​

Error.prepareStackTrace

Functions ​

defaultWarn() ​

defaultWarn(warning): void

Defined in: packages/server/src/ext/skills/errors.ts:45

Parameters ​

warning ​

SkillWarning

Returns ​

void