diff --git a/documentation/architecture/openspec/specs/apply-mimeogram/spec.md b/documentation/architecture/openspec/specs/apply-mimeogram/spec.md
new file mode 100644
index 0000000..861c2b3
--- /dev/null
+++ b/documentation/architecture/openspec/specs/apply-mimeogram/spec.md
@@ -0,0 +1,70 @@
+# apply-mimeogram
+
+## Purpose
+Enables users to apply changes contained in a mimeogram to the local filesystem. This capability is essential for incorporating code or text generated by LLMs back into the project.
+
+## Requirements
+
+### Requirement: Input Source
+The system SHALL accept mimeogram input from a file, standard input, or the system clipboard.
+
+Priority: Critical
+
+#### Scenario: File input
+- **WHEN** user provides a file path as input
+- **THEN** the mimeogram is read from that file
+
+#### Scenario: Stdin input
+- **WHEN** user pipes content to the command
+- **THEN** the mimeogram is read from standard input
+
+#### Scenario: Clipboard input
+- **WHEN** user provides the `--from-clipboard` flag
+- **THEN** the mimeogram is read from the system clipboard
+
+### Requirement: Interactive Review
+The system SHALL support an interactive review mode where users can approve, reject, or modify changes before they are applied.
+
+Priority: High
+
+#### Scenario: Partitive review (default on TTY)
+- **WHEN** running in an interactive terminal
+- **AND** review mode is not explicitly set to silent
+- **THEN** the user is prompted for action on each part (Apply, Diff, Edit, Ignore, etc.)
+
+### Requirement: Silent Application
+The system SHALL support a silent mode to apply all changes without user interaction.
+
+Priority: Medium
+
+#### Scenario: Silent mode
+- **WHEN** user provides the `--review-mode silent` flag (or runs non-interactively)
+- **THEN** all parts are applied without prompting
+
+### Requirement: Base Directory
+The system SHALL allow users to specify a base directory for relative paths in the mimeogram.
+
+Priority: Medium
+
+#### Scenario: Base directory specified
+- **WHEN** user provides `--base-directory /path/to/dir`
+- **THEN** file paths in the mimeogram are resolved relative to that directory
+
+### Requirement: Filesystem Protection
+The system SHALL identify and protect sensitive files from being overwritten, requiring explicit user permission or a force flag.
+
+Priority: Critical
+
+#### Scenario: Protected file modification
+- **WHEN** a mimeogram contains changes to a protected file (e.g., in `.config`)
+- **THEN** the system flags the file as protected
+- **AND** requires explicit confirmation or the `--disable-protections` flag to apply changes
+
+### Requirement: Update Execution
+The system SHALL apply the accepted changes to the filesystem.
+
+Priority: Critical
+
+#### Scenario: Apply changes
+- **WHEN** a part is marked for application (via interactive choice or silent mode)
+- **THEN** the file at the target path is updated with the content from the mimeogram
diff --git a/documentation/architecture/openspec/specs/cli-interface/spec.md b/documentation/architecture/openspec/specs/cli-interface/spec.md
new file mode 100644
index 0000000..30fca4f
--- /dev/null
+++ b/documentation/architecture/openspec/specs/cli-interface/spec.md
@@ -0,0 +1,46 @@
+# cli-interface
+
+## Purpose
+Provides the general command-line interface framework for the application, including entry point, versioning, configuration management, and output formatting.
+
+## Requirements
+
+### Requirement: Entry Point
+The system SHALL provide a main executable command that dispatches to subcommands.
+
+Priority: Critical
+
+#### Scenario: Subcommand dispatch
+- **WHEN** user runs `mimeogram <subcommand>`
+- **THEN** the appropriate subcommand handler is executed
+
+### Requirement: Version Information
+The system SHALL provide a command to display the current version of the application.
+
+Priority: High
+
+#### Scenario: Display version
+- **WHEN** user runs `mimeogram version`
+- **THEN** the package name and version are printed
+
+### Requirement: Configuration Loading
+The system SHALL load configuration from standard configuration file locations or a user-specified file.
+
+Priority: Medium
+
+#### Scenario: Load default config
+- **WHEN** user runs the application without specifying a config file
+- **THEN** configuration is loaded from the platform-specific default location (e.g., `~/.config/mimeogram/general.toml`)
+
+#### Scenario: Load specific config
+- **WHEN** user provides `--configfile <path>`
+- **THEN** configuration is loaded from the specified file
+
+### Requirement: Output Formatting
+The system SHALL provide structured and styled output (e.g., using Rich) for better readability.
+
+Priority: Low
+
+#### Scenario: Rich output
+- **WHEN** running in a terminal
+- **THEN** output includes colors and formatting for emphasis and structure
diff --git a/documentation/architecture/openspec/specs/create-mimeogram/spec.md b/documentation/architecture/openspec/specs/create-mimeogram/spec.md
new file mode 100644
index 0000000..97b0f7e
--- /dev/null
+++ b/documentation/architecture/openspec/specs/create-mimeogram/spec.md
@@ -0,0 +1,113 @@
+# create-mimeogram
+
+## Purpose
+Enables users to bundle multiple files and directories into a single, structured document (a "mimeogram") suitable for sharing with Large Language Models (LLMs). This capability preserves file metadata and directory structure, facilitating code reviews and project sharing.
+
+## Requirements
+
+### Requirement: Source Acquisition
+The system SHALL accept one or more source locations to include in the mimeogram.
+
+Priority: Critical
+
+#### Scenario: File inputs
+- **WHEN** user provides a list of file paths
+- **THEN** the content of each file is included in the mimeogram
+
+#### Scenario: Directory inputs
+- **WHEN** user provides a directory path
+- **AND** recursion is enabled (or default behavior)
+- **THEN** files within that directory are included
+
+#### Scenario: URL inputs
+- **WHEN** user provides a URL
+- **THEN** the content at that URL is fetched and included
+
+### Requirement: Recursion Control
+The system SHALL allow users to control whether directory traversal is recursive.
+
+Priority: Medium
+
+#### Scenario: Recursive traversal
+- **WHEN** user enables recursion (explicitly or by default)
+- **THEN** subdirectories are traversed and their files included
+
+#### Scenario: Non-recursive traversal
+- **WHEN** user disables recursion
+- **THEN** only files in the immediate directory are included
+
+### Requirement: Exclusion Filtering
+The system SHALL exclude files based on ignore rules (e.g., `.gitignore`) by default, but allow disabling this filtering.
+
+Priority: High
+
+#### Scenario: Default exclusion
+- **WHEN** user creates a mimeogram in a git repository
+- **THEN** files listed in `.gitignore` are excluded
+
+#### Scenario: Disable exclusion
+- **WHEN** user provides the `--no-ignores` flag
+- **THEN** files listed in `.gitignore` are included
+
+### Requirement: Clipboard Output
+The system SHALL provide an option to copy the generated mimeogram directly to the system clipboard.
+
+Priority: High
+
+#### Scenario: Copy to clipboard
+- **WHEN** user provides the `--clipboard` flag
+- **THEN** the mimeogram is copied to the clipboard
+- **AND** a success message is displayed
+
+### Requirement: Token Counting
+The system SHALL provide an option to count and display the number of tokens in the generated mimeogram.
+
+Priority: Medium
+
+#### Scenario: Count tokens
+- **WHEN** user provides the `--count-tokens` flag
+- **THEN** the total token count is calculated using the configured tokenizer
+- **AND** the count is displayed to the user
+
+### Requirement: Introductory Message
+The system SHALL allow users to add an introductory message to the mimeogram, optionally launching an editor to capture it.
+
+Priority: Low
+
+#### Scenario: Edit message
+- **WHEN** user provides the `--edit-message` flag
+- **THEN** the system default editor is launched
+- **AND** the user's saved text is included as a message in the mimeogram
+
+### Requirement: Prompt Prepending
+The system SHALL allow users to prepend standard mimeogram format instructions to the output.
+
+Priority: Medium
+
+#### Scenario: Prepend prompt
+- **WHEN** user provides the `--prepend-prompt` flag
+- **THEN** the standard mimeogram instructions are added to the beginning of the output
+
+### Requirement: Strict Mode
+The system SHALL allow users to control behavior when encountering invalid or inaccessible files.
+
+Priority: Low
+
+#### Scenario: Strict mode enabled
+- **WHEN** user provides the `--fail-on-invalid` flag
+- **AND** a source file is inaccessible
+- **THEN** the process fails with an error
+
+#### Scenario: Strict mode disabled (default)
+- **WHEN** strict mode is not enabled
+- **AND** a source file is inaccessible
+- **THEN** the file is skipped and a warning is logged
+
+### Requirement: Deterministic Output
+The system SHALL allow users to generate reproducible mimeograms with deterministic boundary markers.
+
+Priority: Low
+
+#### Scenario: Deterministic boundary
+- **WHEN** user provides the `--deterministic-boundary` flag
+- **THEN** the MIME boundary is generated based on content hash
diff --git a/documentation/architecture/openspec/specs/provide-prompt/spec.md b/documentation/architecture/openspec/specs/provide-prompt/spec.md
new file mode 100644
index 0000000..64c11df
--- /dev/null
+++ b/documentation/architecture/openspec/specs/provide-prompt/spec.md
@@ -0,0 +1,25 @@
+# provide-prompt
+
+## Purpose
+Provides users with the standard prompt text used to instruct LLMs on the mimeogram format. This facilitates manual copy-pasting or integration into LLM project instructions.
+
+## Requirements
+
+### Requirement: Prompt Output
+The system SHALL output the standard mimeogram prompt text.
+
+Priority: High
+
+#### Scenario: Output to stdout
+- **WHEN** user executes the command
+- **THEN** the prompt text is printed to standard output
+
+### Requirement: Clipboard Copy
+The system SHALL provide an option to copy the prompt text directly to the clipboard.
+
+Priority: Medium
+
+#### Scenario: Copy to clipboard
+- **WHEN** user provides the `--to-clipboard` flag
+- **THEN** the prompt text is copied to the system clipboard
+- **AND** a success message is displayed