diff --git a/Cargo.toml b/Cargo.toml
index c6badcc..2f60b4e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "repos"
-version = "0.0.2"
+version = "0.0.3"
 edition = "2024"
 
 [dependencies]
diff --git a/src/constants.rs b/src/constants.rs
new file mode 100644
index 0000000..a4fc2c2
--- /dev/null
+++ b/src/constants.rs
@@ -0,0 +1,34 @@
+//! Central constants for the repos application
+
+/// Default values for Git operations
+pub mod git {
+    /// Default fallback branch name when unable to determine repository default branch
+    pub const FALLBACK_BRANCH: &str = "main";
+
+    /// Default commit message when none is provided
+    pub const DEFAULT_COMMIT_MSG: &str = "Automated changes";
+}
+
+/// Default values for GitHub operations
+pub mod github {
+    /// Default prefix for automated branch names
+    pub const DEFAULT_BRANCH_PREFIX: &str = "automated-changes";
+
+    /// Length of UUID suffix used in branch names
+    pub const UUID_LENGTH: usize = 6;
+
+    /// GitHub API base URL
+    pub const API_BASE: &str = "https://api.github.com";
+
+    /// Default User-Agent header for API requests
+    pub const DEFAULT_USER_AGENT: &str = concat!("repos/", env!("CARGO_PKG_VERSION"));
+}
+
+/// Default values for configuration
+pub mod config {
+    /// Default configuration file name
+    pub const DEFAULT_CONFIG_FILE: &str = "config.yaml";
+
+    /// Default logs directory
+    pub const DEFAULT_LOGS_DIR: &str = "logs";
+}
diff --git a/src/git.rs b/src/git.rs
index aaf0133..8441f19 100644
--- a/src/git.rs
+++ b/src/git.rs
@@ -211,6 +211,6 @@ pub fn get_default_branch(repo_path: &str) -> Result<String> {
         }
     }
 
-    // Final fallback to "main"
-    Ok("main".to_string())
+    // Final fallback to default branch
+    Ok(crate::constants::git::FALLBACK_BRANCH.to_string())
 }
diff --git a/src/github/api.rs b/src/github/api.rs
index 378a6ab..41d55ae 100644
--- a/src/github/api.rs
+++ b/src/github/api.rs
@@ -3,15 +3,12 @@
 use super::client::GitHubClient;
 use super::types::{PrOptions, PullRequestParams};
 use crate::config::Repository;
+use crate::constants::github::{DEFAULT_BRANCH_PREFIX, UUID_LENGTH};
 use crate::git;
 use anyhow::Result;
 use colored::*;
 use uuid::Uuid;
 
-// Constants for maintainability
-const DEFAULT_BRANCH_PREFIX: &str = "automated-changes";
-const UUID_LENGTH: usize = 6;
-
 /// Create a pull request for a repository
 pub async fn create_pull_request(repo: &Repository, options: &PrOptions) -> Result<()> {
     let repo_path = repo.get_target_dir();
diff --git a/src/github/mod.rs b/src/github/mod.rs
index a9c488b..9cffbe8 100644
--- a/src/github/mod.rs
+++ b/src/github/mod.rs
@@ -10,3 +10,6 @@ pub use api::create_pull_request;
 pub use auth::GitHubAuth;
 pub use client::GitHubClient;
 pub use types::{PrOptions, PullRequestParams};
+
+// Re-export constants for easy access
+pub use crate::constants::github::{DEFAULT_BRANCH_PREFIX, DEFAULT_USER_AGENT};
diff --git a/src/github/types.rs b/src/github/types.rs
index b83d7f0..59e5489 100644
--- a/src/github/types.rs
+++ b/src/github/types.rs
@@ -146,6 +146,6 @@ pub struct PullRequest {
 
 /// Constants for GitHub API
 pub mod constants {
-    pub const GITHUB_API_BASE: &str = "https://api.github.com";
-    pub const DEFAULT_USER_AGENT: &str = "repos/0.1.0";
+    // Re-export from centralized constants
+    pub use crate::constants::github::{API_BASE as GITHUB_API_BASE, DEFAULT_USER_AGENT};
 }
diff --git a/src/lib.rs b/src/lib.rs
index 9734eb6..c1a1b25 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 
 pub mod commands;
 pub mod config;
+pub mod constants;
 pub mod git;
 pub mod github;
 pub mod runner;
diff --git a/src/main.rs b/src/main.rs
index 910c5b8..2218f38 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,6 @@
 use anyhow::Result;
 use clap::{Parser, Subcommand};
-use repos::{commands::*, config::Config};
+use repos::{commands::*, config::Config, constants};
 use std::env;
 
 #[derive(Parser)]
@@ -20,7 +20,7 @@ enum Commands {
         repos: Vec<String>,
 
         /// Configuration file path
-        #[arg(short, long, default_value = "config.yaml")]
+        #[arg(short, long, default_value_t = constants::config::DEFAULT_CONFIG_FILE.to_string())]
         config: String,
 
         /// Filter repositories by tag
@@ -41,11 +41,11 @@ enum Commands {
         repos: Vec<String>,
 
         /// Directory to store log files
-        #[arg(short, long, default_value = "logs")]
+        #[arg(short, long, default_value_t = constants::config::DEFAULT_LOGS_DIR.to_string())]
         logs: String,
 
         /// Configuration file path
-        #[arg(short, long, default_value = "config.yaml")]
+        #[arg(short, long, default_value_t = constants::config::DEFAULT_CONFIG_FILE.to_string())]
         config: String,
 
         /// Filter repositories by tag
@@ -95,7 +95,7 @@ enum Commands {
         create_only: bool,
 
         /// Configuration file path
-        #[arg(short, long, default_value = "config.yaml")]
+        #[arg(short, long, default_value_t = constants::config::DEFAULT_CONFIG_FILE.to_string())]
         config: String,
 
         /// Filter repositories by tag
@@ -113,7 +113,7 @@ enum Commands {
         repos: Vec<String>,
 
         /// Configuration file path
-        #[arg(short, long, default_value = "config.yaml")]
+        #[arg(short, long, default_value_t = constants::config::DEFAULT_CONFIG_FILE.to_string())]
         config: String,
 
         /// Filter repositories by tag
@@ -128,7 +128,7 @@ enum Commands {
     /// Create a config.yaml file from discovered Git repositories
     Init {
         /// Output file name
-        #[arg(short, long, default_value = "config.yaml")]
+        #[arg(short, long, default_value_t = constants::config::DEFAULT_CONFIG_FILE.to_string())]
         output: String,
 
         /// Overwrite existing file if it exists