feat: add git forge integration for GitHub and Forgejo (RFC 0013)

- Add forge module with Forge trait for unified PR operations
- Implement GitHubForge with REST API client
- Implement ForgejoForge with REST API client (works with Gitea too)
- Add git URL parsing to extract host, owner, repo from remotes
- Add auto-detection of forge type from remote URLs
- Update blue_pr_create to use native forge API instead of gh CLI
- Support GITHUB_TOKEN and FORGEJO_TOKEN environment variables

The forge abstraction allows Blue to create PRs on both GitHub and
Forgejo/Gitea instances without requiring external CLI tools.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

crates/blue-core/src/forge/forgejo.rs

@@ -0,0 +1,212 @@
+//! Forgejo/Gitea forge implementation
+//!
+//! REST API client for Forgejo and Gitea instances.
+
+use serde::{Deserialize, Serialize};
+
+use super::{CreatePrOpts, Forge, ForgeError, ForgeType, MergeStrategy, PrState, PullRequest};
+
+/// Forgejo/Gitea forge implementation
+pub struct ForgejoForge {
+    host: String,
+    token: String,
+    client: reqwest::blocking::Client,
+}
+
+impl ForgejoForge {
+    /// Create a new Forgejo forge client
+    pub fn new(host: &str, token: String) -> Self {
+        let client = reqwest::blocking::Client::builder()
+            .timeout(std::time::Duration::from_secs(30))
+            .build()
+            .expect("Failed to create HTTP client");
+
+        Self {
+            host: host.to_string(),
+            token,
+            client,
+        }
+    }
+
+    fn api_url(&self, path: &str) -> String {
+        format!("https://{}/api/v1{}", self.host, path)
+    }
+
+    fn auth_header(&self) -> String {
+        format!("token {}", self.token)
+    }
+}
+
+impl Forge for ForgejoForge {
+    fn create_pr(&self, opts: CreatePrOpts) -> Result<PullRequest, ForgeError> {
+        let url = self.api_url(&format!("/repos/{}/{}/pulls", opts.owner, opts.repo));
+
+        let body = ForgejoCreatePr {
+            title: opts.title,
+            body: opts.body,
+            head: opts.head,
+            base: opts.base,
+        };
+
+        let response = self.client
+            .post(&url)
+            .header("Authorization", self.auth_header())
+            .header("Content-Type", "application/json")
+            .json(&body)
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        let status = response.status();
+        if !status.is_success() {
+            let error_text = response.text().unwrap_or_default();
+            return Err(ForgeError::Api {
+                status: status.as_u16(),
+                message: error_text,
+            });
+        }
+
+        let pr: ForgejoPr = response
+            .json()
+            .map_err(|e| ForgeError::Parse(e.to_string()))?;
+
+        Ok(pr.into_pull_request(&self.host, &opts.owner, &opts.repo))
+    }
+
+    fn get_pr(&self, owner: &str, repo: &str, number: u64) -> Result<PullRequest, ForgeError> {
+        let url = self.api_url(&format!("/repos/{}/{}/pulls/{}", owner, repo, number));
+
+        let response = self.client
+            .get(&url)
+            .header("Authorization", self.auth_header())
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        let status = response.status();
+        if status.as_u16() == 404 {
+            return Err(ForgeError::NotFound {
+                owner: owner.to_string(),
+                repo: repo.to_string(),
+                number,
+            });
+        }
+
+        if !status.is_success() {
+            let error_text = response.text().unwrap_or_default();
+            return Err(ForgeError::Api {
+                status: status.as_u16(),
+                message: error_text,
+            });
+        }
+
+        let pr: ForgejoPr = response
+            .json()
+            .map_err(|e| ForgeError::Parse(e.to_string()))?;
+
+        Ok(pr.into_pull_request(&self.host, owner, repo))
+    }
+
+    fn merge_pr(&self, owner: &str, repo: &str, number: u64, strategy: MergeStrategy) -> Result<(), ForgeError> {
+        let url = self.api_url(&format!("/repos/{}/{}/pulls/{}/merge", owner, repo, number));
+
+        let do_type = match strategy {
+            MergeStrategy::Merge => "merge",
+            MergeStrategy::Squash => "squash",
+            MergeStrategy::Rebase => "rebase",
+        };
+
+        let body = ForgejoMergePr {
+            do_type: do_type.to_string(),
+            merge_message_field: None,
+        };
+
+        let response = self.client
+            .post(&url)
+            .header("Authorization", self.auth_header())
+            .header("Content-Type", "application/json")
+            .json(&body)
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        let status = response.status();
+        if !status.is_success() {
+            let error_text = response.text().unwrap_or_default();
+            return Err(ForgeError::Api {
+                status: status.as_u16(),
+                message: error_text,
+            });
+        }
+
+        Ok(())
+    }
+
+    fn pr_is_merged(&self, owner: &str, repo: &str, number: u64) -> Result<bool, ForgeError> {
+        let url = self.api_url(&format!("/repos/{}/{}/pulls/{}/merge", owner, repo, number));
+
+        let response = self.client
+            .get(&url)
+            .header("Authorization", self.auth_header())
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        // 204 = merged, 404 = not merged
+        Ok(response.status().as_u16() == 204)
+    }
+
+    fn forge_type(&self) -> ForgeType {
+        ForgeType::Forgejo
+    }
+}
+
+// Forgejo API request/response types
+
+#[derive(Debug, Serialize)]
+struct ForgejoCreatePr {
+    title: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    body: Option<String>,
+    head: String,
+    base: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ForgejoMergePr {
+    #[serde(rename = "Do")]
+    do_type: String,
+    #[serde(rename = "MergeMessageField", skip_serializing_if = "Option::is_none")]
+    merge_message_field: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+struct ForgejoPr {
+    number: u64,
+    title: String,
+    state: String,
+    merged: bool,
+    head: ForgejoBranch,
+    base: ForgejoBranch,
+    html_url: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+struct ForgejoBranch {
+    #[serde(rename = "ref")]
+    ref_name: String,
+}
+
+impl ForgejoPr {
+    fn into_pull_request(self, host: &str, owner: &str, repo: &str) -> PullRequest {
+        let url = self.html_url.unwrap_or_else(|| {
+            format!("https://{}/{}/{}/pulls/{}", host, owner, repo, self.number)
+        });
+
+        PullRequest {
+            number: self.number,
+            url,
+            title: self.title,
+            state: if self.state == "open" { PrState::Open } else { PrState::Closed },
+            merged: self.merged,
+            head: self.head.ref_name,
+            base: self.base.ref_name,
+        }
+    }
+}

crates/blue-core/src/forge/git_url.rs

@@ -0,0 +1,205 @@
+//! Git URL parsing utilities
+//!
+//! Parses various git remote URL formats to extract host, owner, and repo.
+
+/// Parsed git URL components
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct GitUrl {
+    pub host: String,
+    pub owner: String,
+    pub repo: String,
+    pub protocol: GitProtocol,
+}
+
+/// Git URL protocol
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum GitProtocol {
+    Ssh,
+    Https,
+    Git,
+}
+
+/// Parse a git remote URL into its components
+///
+/// Supports formats:
+/// - `git@github.com:owner/repo.git` (SSH)
+/// - `https://github.com/owner/repo.git` (HTTPS)
+/// - `git://github.com/owner/repo.git` (Git protocol)
+/// - `ssh://git@github.com/owner/repo.git` (SSH with explicit protocol)
+pub fn parse_git_url(url: &str) -> GitUrl {
+    let url = url.trim();
+
+    // SSH format: git@host:owner/repo.git
+    if url.starts_with("git@") || url.contains("@") && url.contains(":") && !url.contains("://") {
+        return parse_ssh_url(url);
+    }
+
+    // HTTPS format: https://host/owner/repo.git
+    if url.starts_with("https://") {
+        return parse_https_url(url);
+    }
+
+    // SSH with protocol: ssh://git@host/owner/repo.git
+    if url.starts_with("ssh://") {
+        return parse_ssh_protocol_url(url);
+    }
+
+    // Git protocol: git://host/owner/repo.git
+    if url.starts_with("git://") {
+        return parse_git_protocol_url(url);
+    }
+
+    // Fallback: try to extract what we can
+    GitUrl {
+        host: String::new(),
+        owner: String::new(),
+        repo: url.to_string(),
+        protocol: GitProtocol::Https,
+    }
+}
+
+fn parse_ssh_url(url: &str) -> GitUrl {
+    // Format: git@host:owner/repo.git or user@host:owner/repo.git
+    let without_user = url.split('@').nth(1).unwrap_or(url);
+    let parts: Vec<&str> = without_user.splitn(2, ':').collect();
+
+    if parts.len() != 2 {
+        return GitUrl {
+            host: String::new(),
+            owner: String::new(),
+            repo: url.to_string(),
+            protocol: GitProtocol::Ssh,
+        };
+    }
+
+    let host = parts[0].to_string();
+    let path = parts[1].trim_end_matches(".git");
+    let path_parts: Vec<&str> = path.splitn(2, '/').collect();
+
+    let (owner, repo) = if path_parts.len() == 2 {
+        (path_parts[0].to_string(), path_parts[1].to_string())
+    } else {
+        (String::new(), path.to_string())
+    };
+
+    GitUrl {
+        host,
+        owner,
+        repo,
+        protocol: GitProtocol::Ssh,
+    }
+}
+
+fn parse_https_url(url: &str) -> GitUrl {
+    // Format: https://host/owner/repo.git
+    let without_protocol = url.trim_start_matches("https://");
+    let parts: Vec<&str> = without_protocol.splitn(4, '/').collect();
+
+    let host = parts.first().map(|s| s.to_string()).unwrap_or_default();
+    let owner = parts.get(1).map(|s| s.to_string()).unwrap_or_default();
+    let repo = parts.get(2)
+        .map(|s| s.trim_end_matches(".git").to_string())
+        .unwrap_or_default();
+
+    GitUrl {
+        host,
+        owner,
+        repo,
+        protocol: GitProtocol::Https,
+    }
+}
+
+fn parse_ssh_protocol_url(url: &str) -> GitUrl {
+    // Format: ssh://git@host/owner/repo.git
+    let without_protocol = url.trim_start_matches("ssh://");
+    let without_user = without_protocol.split('@').nth(1).unwrap_or(without_protocol);
+    let parts: Vec<&str> = without_user.splitn(4, '/').collect();
+
+    let host = parts.first().map(|s| s.to_string()).unwrap_or_default();
+    let owner = parts.get(1).map(|s| s.to_string()).unwrap_or_default();
+    let repo = parts.get(2)
+        .map(|s| s.trim_end_matches(".git").to_string())
+        .unwrap_or_default();
+
+    GitUrl {
+        host,
+        owner,
+        repo,
+        protocol: GitProtocol::Ssh,
+    }
+}
+
+fn parse_git_protocol_url(url: &str) -> GitUrl {
+    // Format: git://host/owner/repo.git
+    let without_protocol = url.trim_start_matches("git://");
+    let parts: Vec<&str> = without_protocol.splitn(4, '/').collect();
+
+    let host = parts.first().map(|s| s.to_string()).unwrap_or_default();
+    let owner = parts.get(1).map(|s| s.to_string()).unwrap_or_default();
+    let repo = parts.get(2)
+        .map(|s| s.trim_end_matches(".git").to_string())
+        .unwrap_or_default();
+
+    GitUrl {
+        host,
+        owner,
+        repo,
+        protocol: GitProtocol::Git,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_ssh_url() {
+        let url = parse_git_url("git@github.com:owner/repo.git");
+        assert_eq!(url.host, "github.com");
+        assert_eq!(url.owner, "owner");
+        assert_eq!(url.repo, "repo");
+        assert_eq!(url.protocol, GitProtocol::Ssh);
+    }
+
+    #[test]
+    fn test_parse_https_url() {
+        let url = parse_git_url("https://github.com/owner/repo.git");
+        assert_eq!(url.host, "github.com");
+        assert_eq!(url.owner, "owner");
+        assert_eq!(url.repo, "repo");
+        assert_eq!(url.protocol, GitProtocol::Https);
+    }
+
+    #[test]
+    fn test_parse_https_url_no_git_suffix() {
+        let url = parse_git_url("https://github.com/owner/repo");
+        assert_eq!(url.host, "github.com");
+        assert_eq!(url.owner, "owner");
+        assert_eq!(url.repo, "repo");
+    }
+
+    #[test]
+    fn test_parse_codeberg_ssh() {
+        let url = parse_git_url("git@codeberg.org:user/project.git");
+        assert_eq!(url.host, "codeberg.org");
+        assert_eq!(url.owner, "user");
+        assert_eq!(url.repo, "project");
+    }
+
+    #[test]
+    fn test_parse_custom_host() {
+        let url = parse_git_url("git@git.example.com:team/app.git");
+        assert_eq!(url.host, "git.example.com");
+        assert_eq!(url.owner, "team");
+        assert_eq!(url.repo, "app");
+    }
+
+    #[test]
+    fn test_parse_ssh_protocol() {
+        let url = parse_git_url("ssh://git@github.com/owner/repo.git");
+        assert_eq!(url.host, "github.com");
+        assert_eq!(url.owner, "owner");
+        assert_eq!(url.repo, "repo");
+        assert_eq!(url.protocol, GitProtocol::Ssh);
+    }
+}

crates/blue-core/src/forge/github.rs

@@ -0,0 +1,208 @@
+//! GitHub forge implementation
+//!
+//! REST API client for GitHub.
+
+use serde::{Deserialize, Serialize};
+
+use super::{CreatePrOpts, Forge, ForgeError, ForgeType, MergeStrategy, PrState, PullRequest};
+
+/// GitHub forge implementation
+pub struct GitHubForge {
+    token: String,
+    client: reqwest::blocking::Client,
+}
+
+impl GitHubForge {
+    /// Create a new GitHub forge client
+    pub fn new(token: String) -> Self {
+        let client = reqwest::blocking::Client::builder()
+            .timeout(std::time::Duration::from_secs(30))
+            .user_agent("blue-mcp/0.1")
+            .build()
+            .expect("Failed to create HTTP client");
+
+        Self { token, client }
+    }
+
+    fn api_url(path: &str) -> String {
+        format!("https://api.github.com{}", path)
+    }
+
+    fn auth_header(&self) -> String {
+        format!("Bearer {}", self.token)
+    }
+}
+
+impl Forge for GitHubForge {
+    fn create_pr(&self, opts: CreatePrOpts) -> Result<PullRequest, ForgeError> {
+        let url = Self::api_url(&format!("/repos/{}/{}/pulls", opts.owner, opts.repo));
+
+        let body = GitHubCreatePr {
+            title: opts.title,
+            body: opts.body,
+            head: opts.head,
+            base: opts.base,
+            draft: opts.draft,
+        };
+
+        let response = self.client
+            .post(&url)
+            .header("Authorization", self.auth_header())
+            .header("Accept", "application/vnd.github+json")
+            .header("X-GitHub-Api-Version", "2022-11-28")
+            .json(&body)
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        let status = response.status();
+        if !status.is_success() {
+            let error_text = response.text().unwrap_or_default();
+            return Err(ForgeError::Api {
+                status: status.as_u16(),
+                message: error_text,
+            });
+        }
+
+        let pr: GitHubPr = response
+            .json()
+            .map_err(|e| ForgeError::Parse(e.to_string()))?;
+
+        Ok(pr.into_pull_request())
+    }
+
+    fn get_pr(&self, owner: &str, repo: &str, number: u64) -> Result<PullRequest, ForgeError> {
+        let url = Self::api_url(&format!("/repos/{}/{}/pulls/{}", owner, repo, number));
+
+        let response = self.client
+            .get(&url)
+            .header("Authorization", self.auth_header())
+            .header("Accept", "application/vnd.github+json")
+            .header("X-GitHub-Api-Version", "2022-11-28")
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        let status = response.status();
+        if status.as_u16() == 404 {
+            return Err(ForgeError::NotFound {
+                owner: owner.to_string(),
+                repo: repo.to_string(),
+                number,
+            });
+        }
+
+        if !status.is_success() {
+            let error_text = response.text().unwrap_or_default();
+            return Err(ForgeError::Api {
+                status: status.as_u16(),
+                message: error_text,
+            });
+        }
+
+        let pr: GitHubPr = response
+            .json()
+            .map_err(|e| ForgeError::Parse(e.to_string()))?;
+
+        Ok(pr.into_pull_request())
+    }
+
+    fn merge_pr(&self, owner: &str, repo: &str, number: u64, strategy: MergeStrategy) -> Result<(), ForgeError> {
+        let url = Self::api_url(&format!("/repos/{}/{}/pulls/{}/merge", owner, repo, number));
+
+        let merge_method = match strategy {
+            MergeStrategy::Merge => "merge",
+            MergeStrategy::Squash => "squash",
+            MergeStrategy::Rebase => "rebase",
+        };
+
+        let body = GitHubMergePr {
+            merge_method: merge_method.to_string(),
+        };
+
+        let response = self.client
+            .put(&url)
+            .header("Authorization", self.auth_header())
+            .header("Accept", "application/vnd.github+json")
+            .header("X-GitHub-Api-Version", "2022-11-28")
+            .json(&body)
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        let status = response.status();
+        if !status.is_success() {
+            let error_text = response.text().unwrap_or_default();
+            return Err(ForgeError::Api {
+                status: status.as_u16(),
+                message: error_text,
+            });
+        }
+
+        Ok(())
+    }
+
+    fn pr_is_merged(&self, owner: &str, repo: &str, number: u64) -> Result<bool, ForgeError> {
+        let url = Self::api_url(&format!("/repos/{}/{}/pulls/{}/merge", owner, repo, number));
+
+        let response = self.client
+            .get(&url)
+            .header("Authorization", self.auth_header())
+            .header("Accept", "application/vnd.github+json")
+            .header("X-GitHub-Api-Version", "2022-11-28")
+            .send()
+            .map_err(|e| ForgeError::Http(e.to_string()))?;
+
+        // 204 = merged, 404 = not merged
+        Ok(response.status().as_u16() == 204)
+    }
+
+    fn forge_type(&self) -> ForgeType {
+        ForgeType::GitHub
+    }
+}
+
+// GitHub API request/response types
+
+#[derive(Debug, Serialize)]
+struct GitHubCreatePr {
+    title: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    body: Option<String>,
+    head: String,
+    base: String,
+    draft: bool,
+}
+
+#[derive(Debug, Serialize)]
+struct GitHubMergePr {
+    merge_method: String,
+}
+
+#[derive(Debug, Deserialize)]
+struct GitHubPr {
+    number: u64,
+    title: String,
+    state: String,
+    merged: Option<bool>,
+    html_url: String,
+    head: GitHubBranch,
+    base: GitHubBranch,
+}
+
+#[derive(Debug, Deserialize)]
+struct GitHubBranch {
+    #[serde(rename = "ref")]
+    ref_name: String,
+}
+
+impl GitHubPr {
+    fn into_pull_request(self) -> PullRequest {
+        PullRequest {
+            number: self.number,
+            url: self.html_url,
+            title: self.title,
+            state: if self.state == "open" { PrState::Open } else { PrState::Closed },
+            merged: self.merged.unwrap_or(false),
+            head: self.head.ref_name,
+            base: self.base.ref_name,
+        }
+    }
+}

crates/blue-core/src/forge/mod.rs

@@ -0,0 +1,221 @@
+//! Git Forge Integration (RFC 0013)
+//!
+//! Provides a unified interface for interacting with different git forges
+//! (GitHub, Forgejo/Gitea) for PR operations.
+
+mod git_url;
+mod github;
+mod forgejo;
+
+pub use git_url::{GitUrl, parse_git_url};
+pub use github::GitHubForge;
+pub use forgejo::ForgejoForge;
+
+use serde::{Deserialize, Serialize};
+use std::env;
+
+/// Supported forge types
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum ForgeType {
+    GitHub,
+    Forgejo,
+}
+
+impl std::fmt::Display for ForgeType {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ForgeType::GitHub => write!(f, "github"),
+            ForgeType::Forgejo => write!(f, "forgejo"),
+        }
+    }
+}
+
+/// Options for creating a pull request
+#[derive(Debug, Clone)]
+pub struct CreatePrOpts {
+    pub owner: String,
+    pub repo: String,
+    pub head: String,
+    pub base: String,
+    pub title: String,
+    pub body: Option<String>,
+    pub draft: bool,
+}
+
+/// Merge strategy for PRs
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum MergeStrategy {
+    Merge,
+    Squash,
+    Rebase,
+}
+
+/// Pull request info returned from forge operations
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PullRequest {
+    pub number: u64,
+    pub url: String,
+    pub title: String,
+    pub state: PrState,
+    pub merged: bool,
+    pub head: String,
+    pub base: String,
+}
+
+/// Pull request state
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum PrState {
+    Open,
+    Closed,
+}
+
+/// Forge errors
+#[derive(Debug, thiserror::Error)]
+pub enum ForgeError {
+    #[error("HTTP request failed: {0}")]
+    Http(String),
+
+    #[error("API error: {status} - {message}")]
+    Api { status: u16, message: String },
+
+    #[error("Missing token: set {var} environment variable")]
+    MissingToken { var: &'static str },
+
+    #[error("Failed to parse response: {0}")]
+    Parse(String),
+
+    #[error("PR not found: {owner}/{repo}#{number}")]
+    NotFound { owner: String, repo: String, number: u64 },
+}
+
+/// The Forge trait - unified interface for git forges
+pub trait Forge: Send + Sync {
+    /// Create a pull request
+    fn create_pr(&self, opts: CreatePrOpts) -> Result<PullRequest, ForgeError>;
+
+    /// Get a pull request by number
+    fn get_pr(&self, owner: &str, repo: &str, number: u64) -> Result<PullRequest, ForgeError>;
+
+    /// Merge a pull request
+    fn merge_pr(&self, owner: &str, repo: &str, number: u64, strategy: MergeStrategy) -> Result<(), ForgeError>;
+
+    /// Check if a PR is merged
+    fn pr_is_merged(&self, owner: &str, repo: &str, number: u64) -> Result<bool, ForgeError>;
+
+    /// Get the forge type
+    fn forge_type(&self) -> ForgeType;
+}
+
+/// Detect forge type from a git remote URL
+pub fn detect_forge_type(remote_url: &str) -> ForgeType {
+    let url = parse_git_url(remote_url);
+
+    match url.host.as_str() {
+        "github.com" => ForgeType::GitHub,
+        "codeberg.org" => ForgeType::Forgejo,
+        host if host.contains("gitea") => ForgeType::Forgejo,
+        host if host.contains("forgejo") => ForgeType::Forgejo,
+        _ => {
+            // For unknown hosts, try probing the Forgejo/Gitea API
+            // If that fails, default to GitHub API format
+            if probe_forgejo_api(&url.host) {
+                ForgeType::Forgejo
+            } else {
+                ForgeType::GitHub
+            }
+        }
+    }
+}
+
+/// Probe a host to see if it's running Forgejo/Gitea
+fn probe_forgejo_api(host: &str) -> bool {
+    // Try to hit the version endpoint - Forgejo/Gitea respond, GitHub doesn't
+    let url = format!("https://{}/api/v1/version", host);
+
+    // Use a blocking client with short timeout for probing
+    let client = match reqwest::blocking::Client::builder()
+        .timeout(std::time::Duration::from_secs(5))
+        .build()
+    {
+        Ok(c) => c,
+        Err(_) => return false,
+    };
+
+    match client.get(&url).send() {
+        Ok(resp) => resp.status().is_success(),
+        Err(_) => false,
+    }
+}
+
+/// Get the appropriate token for a forge type
+pub fn get_token(forge_type: ForgeType) -> Result<String, ForgeError> {
+    match forge_type {
+        ForgeType::GitHub => {
+            env::var("GITHUB_TOKEN")
+                .or_else(|_| env::var("GH_TOKEN"))
+                .map_err(|_| ForgeError::MissingToken { var: "GITHUB_TOKEN" })
+        }
+        ForgeType::Forgejo => {
+            env::var("FORGEJO_TOKEN")
+                .or_else(|_| env::var("GITEA_TOKEN"))
+                .map_err(|_| ForgeError::MissingToken { var: "FORGEJO_TOKEN" })
+        }
+    }
+}
+
+/// Create a forge instance for a given remote URL
+pub fn create_forge(remote_url: &str) -> Result<Box<dyn Forge>, ForgeError> {
+    let url = parse_git_url(remote_url);
+    let forge_type = detect_forge_type(remote_url);
+    let token = get_token(forge_type)?;
+
+    match forge_type {
+        ForgeType::GitHub => Ok(Box::new(GitHubForge::new(token))),
+        ForgeType::Forgejo => Ok(Box::new(ForgejoForge::new(&url.host, token))),
+    }
+}
+
+/// Forge configuration for caching
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ForgeConfig {
+    #[serde(rename = "type")]
+    pub forge_type: ForgeType,
+    pub host: String,
+    pub owner: String,
+    pub repo: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_detect_github() {
+        assert_eq!(
+            detect_forge_type("git@github.com:owner/repo.git"),
+            ForgeType::GitHub
+        );
+        assert_eq!(
+            detect_forge_type("https://github.com/owner/repo.git"),
+            ForgeType::GitHub
+        );
+    }
+
+    #[test]
+    fn test_detect_codeberg() {
+        assert_eq!(
+            detect_forge_type("git@codeberg.org:owner/repo.git"),
+            ForgeType::Forgejo
+        );
+    }
+
+    #[test]
+    fn test_detect_gitea_in_host() {
+        assert_eq!(
+            detect_forge_type("git@gitea.example.com:owner/repo.git"),
+            ForgeType::Forgejo
+        );
+    }
+}

crates/blue-core/src/lib.rs

@@ -15,6 +15,7 @@ const _BLUE_SECRET_NAME: &str = "Sheepey"; // pronounced "Shee-paay"
 
 pub mod daemon;
 pub mod documents;
+pub mod forge;
 pub mod indexer;
 pub mod llm;
 pub mod realm;
@@ -25,6 +26,7 @@ pub mod voice;
 pub mod workflow;
 
 pub use documents::{Adr, Audit, AuditFinding, AuditSeverity, AuditType, Decision, Rfc, Spike, SpikeOutcome, Status, Task, update_markdown_status};
+pub use forge::{CreatePrOpts, Forge, ForgeConfig, ForgeError, ForgeType, ForgejoForge, GitHubForge, GitUrl, MergeStrategy, PrState, PullRequest, create_forge, detect_forge_type, get_token, parse_git_url};
 pub use indexer::{Indexer, IndexerConfig, IndexerError, IndexResult, ParsedSymbol, is_indexable_file, should_skip_dir, DEFAULT_INDEX_MODEL, MAX_FILE_LINES};
 pub use llm::{CompletionOptions, CompletionResult, LlmBackendChoice, LlmConfig, LlmError, LlmManager, LlmProvider, LlmProviderChoice, LocalLlmConfig, ApiLlmConfig, KeywordLlm, MockLlm, ProviderStatus};
 pub use repo::{detect_blue, BlueHome, RepoError, WorktreeInfo};

crates/blue-mcp/src/handlers/pr.rs

@@ -1,6 +1,8 @@
 //! Pull Request tool handlers
 //!
 //! Handles PR creation, verification, and merge with workflow enforcement.
+//! Supports both GitHub and Forgejo/Gitea via the forge abstraction (RFC 0013).
+//!
 //! Enforces:
 //! - Base branch must be `develop` (not `main`)
 //! - Test plan checkboxes must be verified before merge
@@ -12,7 +14,7 @@
 
 use std::process::Command;
 
-use blue_core::ProjectState;
+use blue_core::{CreatePrOpts, MergeStrategy, ProjectState, create_forge, detect_forge_type, parse_git_url};
 use serde_json::{json, Value};
 
 use crate::error::ServerError;
@@ -34,7 +36,9 @@ pub enum TaskCategory {
 ///
 /// If `rfc` is provided (e.g., "0007-consistent-branch-naming"), the title
 /// will be formatted as "RFC 0007: Consistent Branch Naming" per RFC 0007.
-pub fn handle_create(_state: &ProjectState, args: &Value) -> Result<Value, ServerError> {
+///
+/// Uses native REST API for the detected forge (GitHub or Forgejo/Gitea).
+pub fn handle_create(state: &ProjectState, args: &Value) -> Result<Value, ServerError> {
     let rfc = args.get("rfc").and_then(|v| v.as_str());
 
     // If RFC is provided, format title as "RFC NNNN: Title Case Name"
@@ -72,39 +76,90 @@ pub fn handle_create(_state: &ProjectState, args: &Value) -> Result<Value, Serve
         }));
     }
 
-    // Build the gh command
+    // Get remote URL and detect forge type
-    let mut cmd_parts = vec![
+    let remote_url = match get_remote_url(&state.home.root) {
-        "gh pr create".to_string(),
+        Ok(url) => url,
-        format!("--base {}", base),
+        Err(e) => {
-        format!("--title '{}'", title),
+            return Ok(json!({
-    ];
+                "status": "error",
-
+                "message": blue_core::voice::error(
-    if let Some(b) = body {
+                    "Couldn't detect git remote",
-        cmd_parts.push(format!("--body '{}'", b.replace('\'', "'\\''")));
+                    &e
+                )
+            }));
         }
+    };
 
-    if draft {
+    let git_url = parse_git_url(&remote_url);
-        cmd_parts.push("--draft".to_string());
+    let forge_type = detect_forge_type(&remote_url);
+
+    // Get current branch for head
+    let head = match get_current_branch(&state.home.root) {
+        Ok(branch) => branch,
+        Err(e) => {
+            return Ok(json!({
+                "status": "error",
+                "message": blue_core::voice::error(
+                    "Couldn't get current branch",
+                    &e
+                )
+            }));
         }
+    };
 
-    let create_command = cmd_parts.join(" ");
+    // Create forge client and make PR
+    let forge = match create_forge(&remote_url) {
+        Ok(f) => f,
+        Err(e) => {
+            return Ok(json!({
+                "status": "error",
+                "message": blue_core::voice::error(
+                    "Couldn't create forge client",
+                    &format!("{}", e)
+                )
+            }));
+        }
+    };
 
+    let opts = CreatePrOpts {
+        owner: git_url.owner.clone(),
+        repo: git_url.repo.clone(),
+        head,
+        base: base.to_string(),
+        title: title.clone(),
+        body: body.map(|s| s.to_string()),
+        draft,
+    };
+
+    match forge.create_pr(opts) {
+        Ok(pr) => {
             Ok(json!({
                 "status": "success",
-        "command": create_command,
+                "pr_url": pr.url,
+                "pr_number": pr.number,
+                "forge": forge_type.to_string(),
                 "base_branch": base,
                 "title": title,
-        "next_steps": [
-            format!("Run: {}", create_command),
-            "Add yourself as reviewer: gh pr edit --add-reviewer @me",
-            "Run blue_pr_verify to check test plan items"
-        ],
                 "message": blue_core::voice::success(
-            &format!("Ready to create PR targeting '{}'", base),
+                    &format!("Created PR #{}", pr.number),
-            Some("Run the command to create the PR.")
+                    Some(&pr.url)
+                ),
+                "next_steps": [
+                    "Run blue_pr_verify to check test plan items"
+                ]
+            }))
+        }
+        Err(e) => {
+            Ok(json!({
+                "status": "error",
+                "message": blue_core::voice::error(
+                    "Failed to create PR",
+                    &format!("{}", e)
                 )
             }))
         }
+    }
+}
 
 /// Handle blue_pr_verify
 pub fn handle_verify(_state: &ProjectState, args: &Value) -> Result<Value, ServerError> {
@@ -547,3 +602,52 @@ fn to_title_case(s: &str) -> String {
         .collect::<Vec<_>>()
         .join(" ")
 }
+
+/// Get the remote URL from git config
+///
+/// Tries 'origin' first, then falls back to any other remote.
+fn get_remote_url(repo_path: &std::path::Path) -> Result<String, String> {
+    let repo = git2::Repository::discover(repo_path)
+        .map_err(|e| format!("Not a git repository: {}", e))?;
+
+    // Try origin first
+    if let Ok(remote) = repo.find_remote("origin") {
+        if let Some(url) = remote.url() {
+            return Ok(url.to_string());
+        }
+    }
+
+    // Try forgejo remote (common in Blue repos)
+    if let Ok(remote) = repo.find_remote("forgejo") {
+        if let Some(url) = remote.url() {
+            return Ok(url.to_string());
+        }
+    }
+
+    // Fall back to any remote
+    let remotes = repo.remotes()
+        .map_err(|e| format!("Couldn't list remotes: {}", e))?;
+
+    for name in remotes.iter().flatten() {
+        if let Ok(remote) = repo.find_remote(name) {
+            if let Some(url) = remote.url() {
+                return Ok(url.to_string());
+            }
+        }
+    }
+
+    Err("No remotes configured".to_string())
+}
+
+/// Get the current branch name
+fn get_current_branch(repo_path: &std::path::Path) -> Result<String, String> {
+    let repo = git2::Repository::discover(repo_path)
+        .map_err(|e| format!("Not a git repository: {}", e))?;
+
+    let head = repo.head()
+        .map_err(|e| format!("Couldn't get HEAD: {}", e))?;
+
+    head.shorthand()
+        .map(|s| s.to_string())
+        .ok_or_else(|| "HEAD is not a branch".to_string())
+}