windmill-labs/windmill · error

rebase_draft currently supports scripts, flows, and apps.

Error message

rebase_draft currently supports scripts, flows, and apps.

What it means

Thrown by rebaseDraft's default switch branch when the requested WorkspaceItemType is outside the supported set (script, flow, app). The rebase_draft tool computes a draft-vs-fork-base diff, which is only implemented for those three types; other item types (variables, resources, schedules, ...) are rejected outright rather than silently mishandled.

Source

Thrown at frontend/src/lib/components/copilot/chat/global/core.ts:6220

// Discard a stale draft and return its own changes (vs the fork base) as a diff so
// the model can re-apply them on the latest deploy. Discarding rather than resetting
// keeps the base pointer honest (the next write re-bases on the current head) and
// fails safe: a premature deploy hits "no draft" instead of silently shipping the
// latest unchanged.
async function rebaseDraft(
	args: { type: WorkspaceItemType; path: string },
	ctx: WriteDraftCtx
): Promise<string> {
	switch (args.type) {
		case 'script':
			return rebaseScriptDraft(args.path, ctx)
		case 'flow':
			return rebaseFlowDraft(args.path, ctx)
		case 'app':
			return rebaseAppDraft(args.path, ctx)
		default:
			throw new Error('rebase_draft currently supports scripts, flows, and apps.')
	}
}

async function rebaseScriptDraft(path: string, ctx: WriteDraftCtx): Promise<string> {
	const { workspace, toolId, toolCallbacks } = ctx

	const draft = await getGlobalDraft(workspace, 'script', path)
	if (!draft || typeof draft.value !== 'string' || !draft.language) {
		throw new Error(`No script draft found for "${path}".`)
	}
	if (!(await ScriptService.existsScriptByPath({ workspace, path }))) {
		throw new Error(`Script "${path}" is not deployed; there is no newer version to rebase onto.`)
	}

	const latest = await ScriptService.getScriptByPath({ workspace, path })
	const baseHash = draft.parentHash
	if (baseHash && baseHash === latest.hash) {
		const message = `Draft "${path}" is already based on the latest deployed version (${latest.hash}).`

View on GitHub (pinned to e474e8803c)

Solutions

1. Call rebase_draft only with type 'script', 'flow', or 'app'
2. For other workspace item types, use the item-specific diff or discard tools instead
3. If a new item type becomes draftable, extend rebaseDraft rather than passing it through

When it happens

Trigger: Thrown at frontend/src/lib/components/copilot/chat/global/core.ts:6220 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of windmill-labs/windmill@e474e8803c (2026-09-03). Data as JSON: /api/errors/dd1d78ea1d39d0cf. Report an issue: GitHub.