mvanhorn/last30days-skill · error

engine: create tmp cache (%s, set %s to override): %w

Error message

engine: create tmp cache (%s, set %s to override): %w

What it means

Error "engine: create tmp cache (%s, set %s to override): %w" thrown in mvanhorn/last30days-skill.

Source

Thrown at mcp/internal/engine/extract.go:80

		return Ensure(src, override, version)
	}
	base, err := os.UserCacheDir()
	if err != nil {
		return "", fmt.Errorf("engine: resolve user cache dir (set %s to override): %w", CacheEnvOverride, err)
	}
	return Ensure(src, base, version)
}

func ensureLocked(src fs.FS, cacheDir, version string) error {
	if sentinelMatches(cacheDir, version) {
		return nil
	}
	tmpDir := cacheDir + ".tmp"
	if err := os.RemoveAll(tmpDir); err != nil {
		return fmt.Errorf("engine: clean tmp cache: %w", err)
	}
	if err := os.MkdirAll(tmpDir, 0o755); err != nil {
		return fmt.Errorf("engine: create tmp cache (%s, set %s to override): %w", tmpDir, CacheEnvOverride, err)
	}
	if err := extractAll(src, tmpDir); err != nil {
		_ = os.RemoveAll(tmpDir)
		return err
	}
	sentinel := filepath.Join(tmpDir, SentinelFilename)
	if err := os.WriteFile(sentinel, []byte(version), 0o644); err != nil {
		_ = os.RemoveAll(tmpDir)
		return fmt.Errorf("engine: write sentinel: %w", err)
	}
	if err := os.RemoveAll(cacheDir); err != nil {
		_ = os.RemoveAll(tmpDir)
		return fmt.Errorf("engine: clean old cache: %w", err)
	}
	if err := os.Rename(tmpDir, cacheDir); err != nil {
		_ = os.RemoveAll(tmpDir)
		return fmt.Errorf("engine: promote tmp cache: %w", err)
	}

View on GitHub (pinned to c7460f6114)

Solutions

1. Ensure the parent cache directory exists and is writable by the current user.
2. Set LAST30DAYS_CACHE_DIR to a writable location and retry.
3. Free disk space if the filesystem is full.

When it happens

Trigger: Fires when the engine cannot create the temporary cache directory used to stage the embedded last30days payload, typically because the cache root is unwritable or the disk is full.

Common situations: See trigger scenarios.

AI-assisted analysis of mvanhorn/last30days-skill@c7460f6114 (2026-08-15). Data as JSON: /api/errors/f7dd73fe7c4d808f. Report an issue: GitHub.