slidevjs/slidev · error · Error

No active slide project found.

Error message

No active slide project found.

What it means

Thrown by the `slidev_getActiveSlide` VS Code language-model tool when the extension's `activeProject` ref is null/undefined. The tool exposes the currently focused deck to Copilot/Chat; it can only return data when at least one Slidev project has been detected and registered. The guard `if (project == null)` covers both the never-loaded case and the case where the active project was disposed.

Source

Thrown at packages/vscode/src/lmTools.ts:15

import { slash } from '@antfu/utils'
import { stringifySlide } from '@slidev/parser/core'
import { defineService, useDisposable } from 'reactive-vscode'
import { LanguageModelTextPart, LanguageModelToolResult, lm } from 'vscode'
import { useFocusedSlide } from './composables/useFocusedSlide'
import { activeEntry, activeProject, projects } from './projects'

export const useLmTools = defineService(() => {
  const { focusedMarkdown, focusedSourceSlide, focusedSlideNo } = useFocusedSlide()

  registerSimpleTool('slidev_getActiveSlide', () => {
    const project = activeProject.value

    if (project == null) {
      throw new Error(`No active slide project found.`)
    }

    return formatObject({
      'Entry file': project.entry,
      'Root directory': project.userRoot,
      'Preview server port': project.port.value || 'Not running',
      'Number of slides': project.data.slides.length,
      'Focused slide no. in presentation (from 1)': focusedSlideNo.value || 'None',
      'Editing file': focusedMarkdown.value?.filepath || 'Not editing',
      'Editing slide index in file (from 0)': focusedSourceSlide.value ? focusedSourceSlide.value.index : 'N/A',
    })
  })

  registerSimpleTool('slidev_getSlideContent', (input: {
    entrySlidePath: string
    slideNo: number
  }) => {
    const project = resolveProjectFromEntry(input.entrySlidePath)

View on GitHub (pinned to 0d798ace58)

Solutions

1. Open a Slidev entry file (e.g. `slides.md`) in the editor so the extension registers the project and populates `activeProject`.
2. Start the Slidev preview from a deck; the extension binds the active project on preview launch.
3. Call `slidev_chooseEntry` with an explicit entry path to set the active entry, then retry `slidev_getActiveSlide`.
4. If you expect a project but it is missing, run `slidev_listEntries` to confirm which decks the extension currently has loaded.

// The extension's activeProject ref — guard before calling the tool:
import { activeProject } from './projects'
function hasActiveProject(): boolean {
  return activeProject.value != null
}

// registerSimpleTool already wraps invoke in try/catch and returns the message
// as a LanguageModelTextPart, so the LM receives 'Error: No active slide project found.'
// The caller (the model) should react by listing entries / choosing one.

When it happens

Trigger: The model invokes `slidev_getActiveSlide` before any Slidev markdown entry is open/registered in the workspace, or after the active project's preview was closed and its entry removed from the `projects` map. `activeProject.value` is null because no entry is focused.

Common situations: Opening the chat participant in a workspace with no `slides.md`, before starting a Slidev preview, or after closing all deck files. The `activeProject` ref tracks the currently focused editor's project; with nothing focused it is empty.

Related errors

• No content found for slide number ${input.slideNo} in entry:
• No slide found with title: "${input.title}".
• entrySlidePath is required.
• No active slide entry found. Please set an active slide entr
• No project found for entry: ${entry}. All entries: ${formatL

AI-assisted analysis of slidevjs/slidev@0d798ace58 (2026-08-12). Data as JSON: /api/errors/ece6f82829aacee5. Report an issue: GitHub.