microsoft/vscode · error · Error

Message exceeds token limit.

Error message

Message exceeds token limit.

What it means

Error "Message exceeds token limit." thrown in microsoft/vscode.

Source

Thrown at extensions/copilot/src/extension/conversation/vscode-node/languageModelAccess.ts:758

				"tokenLimit": { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true, "comment": "The number of tokens that can be used" }
			}
		*/
		this._telemetryService.sendMSFTTelemetryEvent(
			'languagemodelrequest',
			{
				extensionId,
				extensionVersion,
				model: _endpoint.model
			},
			{
				tokenCount,
				tokenLimit
			}
		);

		// If no messages they got rendered out due to token limit
		if (messages.length === 0 || tokenCount > tokenLimit) {
			throw new Error('Message exceeds token limit.');
		}

		if (_options.tools && _options.tools.length > 128 && !_endpoint.supportsToolSearch) {
			throw new Error('Cannot have more than 128 tools per request.');
		}

		const endpoint: IChatEndpoint = new Proxy(_endpoint, {
			get: function (target, prop, receiver) {
				if (prop === 'getExtraHeaders') {
					return function () {
						const extraHeaders = target.getExtraHeaders?.() ?? {};
						if (!extensionId) {
							return extraHeaders;
						}
						return {
							...extraHeaders,
							'x-onbehalf-extension-id': `${extensionId}/${extensionVersion}`,
						};

View on GitHub (pinned to a94b963a32)

When it happens

Trigger: Thrown at extensions/copilot/src/extension/conversation/vscode-node/languageModelAccess.ts:758 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microsoft/vscode@a94b963a32 (2026-08-12). Data as JSON: /api/errors/2de2244909c9938e. Report an issue: GitHub.