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diff --git a/spectr/changes/add-nvimf-program/specs/shell-utilities/spec.md b/spectr/changes/archive/2025-12-02-add-nvimf-program/specs/shell-utilities/spec.md
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diff --git a/spectr/changes/add-nvimf-program/tasks.md b/spectr/changes/archive/2025-12-02-add-nvimf-program/tasks.md
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+# Shell Utilities Specification
+
+## Purpose
+
+TODO: Add purpose description
+
+## Requirements
+
+### Requirement: Fuzzy File Opening (nvimf)
+The system SHALL provide an `nvimf` command that enables interactive fuzzy file selection with syntax-highlighted preview and opens the selected file in Neovim.
+
+#### Scenario: Interactive file selection
+- **WHEN** user runs `nvimf` without arguments in a directory
+- **THEN** the system displays an interactive fuzzy finder listing all files in the current directory and subdirectories
+- **AND** shows a syntax-highlighted preview using bat for the selected file
+- **AND** opens the selected file in Neovim upon confirmation
+
+#### Scenario: No file selected
+- **WHEN** user runs `nvimf` and cancels the selection (ESC or Ctrl-C)
+- **THEN** the system exits without opening any file
+- **AND** returns a zero exit code (graceful cancellation)
+
+#### Scenario: Empty directory
+- **WHEN** user runs `nvimf` in a directory with no files
+- **THEN** the system displays an empty fuzzy finder
+- **AND** exits gracefully when canceled
+
+#### Scenario: Editor integration
+- **WHEN** user selects a file from the fuzzy finder
+- **THEN** the system opens the file in Neovim
+- **AND** preserves the terminal state and working directory
+
+### Requirement: Cross-Platform File Selection Deployment
+The `nvimf` program SHALL be deployed as a packaged Nix derivation with proper dependency management.
+
+#### Scenario: NixOS installation
+- **WHEN** nvimf module is enabled on a NixOS system
+- **THEN** the `nvimf` command is available in system PATH
+- **AND** required dependencies (fzf, bat, neovim) are automatically available
+
+#### Scenario: Darwin installation
+- **WHEN** nvimf module is enabled on a macOS system via nix-darwin
+- **THEN** the `nvimf` command is available in system PATH
+- **AND** required dependencies are automatically available
+
+#### Scenario: Engineer feature integration
+- **WHEN** the engineer feature is enabled
+- **THEN** nvimf is automatically available alongside other development tools
+
+### Requirement: Preview and Dependency Management
+The nvimf program SHALL explicitly declare its runtime dependencies (fzf, bat, neovim) and provide syntax-highlighted file previews.
+
+#### Scenario: Syntax highlighting in preview
+- **WHEN** user navigates through files in the fuzzy finder
+- **THEN** the preview pane shows syntax-highlighted content for recognized file types
+- **AND** uses bat's automatic language detection
+
+#### Scenario: Missing dependencies handled by Nix
+- **WHEN** nvimf module is installed via Nix
+- **THEN** all runtime dependencies are available in the wrapped script's PATH
+- **AND** the script does not fail due to missing commands
+
+#### Scenario: Script wrapper isolation
+- **WHEN** nvimf script is executed
+- **THEN** it uses the Nix-provided versions of fzf, bat, and neovim
+- **AND** does not rely on system-installed versions of these tools
+