Graphorin API reference v0.5.0

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Graphorin API reference / @graphorin/mcp / errors / MCPToolExecutionError

Class: MCPToolExecutionError

Defined in: packages/mcp/src/errors/index.ts:112

Raised when the MCP server reports a tool-level failure (CallToolResult.isError === true, MC-4). The server's content text rides in the message so the model keeps its self-correction signal — while the executor records a real tool FAILURE (audit, retry and error policies all engage) instead of a fake success.

Extends

• GraphorinMCPError

Constructors

Constructor

new MCPToolExecutionError(message, opts?): MCPToolExecutionError;

Defined in: packages/mcp/src/errors/index.ts:60

Parameters

Parameter	Type
message	string
opts	{ cause?: unknown; hint?: string; metadata?: MCPErrorMetadata; }
opts.cause?	unknown
opts.hint?	string
opts.metadata?	MCPErrorMetadata

Returns

MCPToolExecutionError

Inherited from

GraphorinMCPError.constructor

Properties

Property	Modifier	Type	Description	Overrides	Inherited from	Defined in
cause?	readonly	unknown	Underlying cause (chained errors).	-	GraphorinMCPError.cause	packages/mcp/src/errors/index.ts:58
hint?	readonly	string	Optional remediation hint surfaced in CLI output.	-	GraphorinMCPError.hint	packages/mcp/src/errors/index.ts:54
kind	readonly	"tool-execution"	Lowercase discriminator.	GraphorinMCPError.kind	-	packages/mcp/src/errors/index.ts:113
message	public	string	-	-	GraphorinMCPError.message	node_modules/.pnpm/[email protected]/node_modules/typescript/lib/lib.es5.d.ts:1077
metadata	readonly	Readonly<MCPErrorMetadata>	Sanitized metadata; never carries secret material.	-	GraphorinMCPError.metadata	packages/mcp/src/errors/index.ts:56
name	public	string	-	-	GraphorinMCPError.name	node_modules/.pnpm/[email protected]/node_modules/typescript/lib/lib.es5.d.ts:1076
stack?	public	string	-	-	GraphorinMCPError.stack	node_modules/.pnpm/[email protected]/node_modules/typescript/lib/lib.es5.d.ts:1078
stackTraceLimit	static	number	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.	-	GraphorinMCPError.stackTraceLimit	node_modules/.pnpm/@[email protected]/node_modules/@types/node/globals.d.ts:68

Methods

captureStackTrace()

static captureStackTrace(targetObject, constructorOpt?): void;

Defined in: node_modules/.pnpm/@[email protected]/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.

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:

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

Parameter	Type
targetObject	object
constructorOpt?	Function

Returns

void

Inherited from

GraphorinMCPError.captureStackTrace

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prepareStackTrace()

static prepareStackTrace(err, stackTraces): any;

Defined in: node_modules/.pnpm/@[email protected]/node_modules/@types/node/globals.d.ts:56

Parameters

Parameter	Type
err	Error
stackTraces	CallSite[]

Returns

any

See

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

Inherited from

GraphorinMCPError.prepareStackTrace