github/github-mcp-server · error

path must not contain control characters

Error message

path must not contain control characters

What it means

Error "path must not contain control characters" thrown in github/github-mcp-server.

Source

Thrown at pkg/github/repositories.go:2460

		}
	} `graphql:"blame(path: $path)"`
}

// validateBlamePath rejects empty, leading-slash, traversal-laden, or
// control-character paths before any network call is made.
func validateBlamePath(p string) error {
	if strings.TrimSpace(p) == "" {
		return fmt.Errorf("path must not be empty")
	}
	if strings.HasPrefix(p, "/") {
		return fmt.Errorf("path must be relative to the repository root (no leading '/')")
	}
	if slices.Contains(strings.Split(p, "/"), "..") {
		return fmt.Errorf("path must not contain '..' segments")
	}
	for _, r := range p {
		if r < 0x20 || r == 0x7f {
			return fmt.Errorf("path must not contain control characters")
		}
	}
	return nil
}

func GetFileBlame(t translations.TranslationHelperFunc) inventory.ServerTool {
	st := NewTool(
		ToolsetMetadataRepos,
		mcp.Tool{
			Name: "get_file_blame",
			Description: t("TOOL_GET_FILE_BLAME_DESCRIPTION",
				"Get git blame information for a file, showing the commit that last modified each line. "+
					"Ranges share commit metadata via the top-level 'commits' map keyed by SHA. "+
					"Use 'start_line'/'end_line' to restrict the result to a window of the file, and "+
					"'perPage'/'after' to cursor-page through returned ranges. Matching ranges are capped at "+
					"1000; when the cap is hit 'truncated' is set to true and 'total_ranges' reports the pre-cap match count.",
			),
			Annotations: &mcp.ToolAnnotations{

View on GitHub (pinned to 0ea1f775a7)

When it happens

Trigger: Thrown at pkg/github/repositories.go:2460 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of github/github-mcp-server@0ea1f775a7 (2026-08-15). Data as JSON: /api/errors/f07a4f2194e05878. Report an issue: GitHub.