feat: Created the --auth-mcp CLI flag to let users auth with remote MCP servers without needing to be in the REPL

src/cli/completer.rs

@@ -5,9 +5,9 @@ use crate::utils::list_file_names;
 use crate::vault::Vault;
 use clap_complete::{CompletionCandidate, Shell, generate};
 use clap_complete_nushell::Nushell;
-use std::env;
 use std::ffi::OsStr;
 use std::io;
+use std::{env, fs};
 
 const COYOTE_CLI_NAME: &str = "coyote";
 
@@ -134,6 +134,34 @@ pub(super) fn session_completer(current: &OsStr) -> Vec<CompletionCandidate> {
         .collect()
 }
 
+pub(super) fn mcp_server_completer(current: &OsStr) -> Vec<CompletionCandidate> {
+    let cur = current.to_string_lossy();
+    let content = match fs::read_to_string(paths::mcp_config_file()) {
+        Ok(c) => c,
+        Err(_) => return vec![],
+    };
+    let json: serde_json::Value = match serde_json::from_str(&content) {
+        Ok(v) => v,
+        Err(_) => return vec![],
+    };
+    let servers = match json.get("mcpServers").and_then(|v| v.as_object()) {
+        Some(s) => s,
+        None => return vec![],
+    };
+
+    servers
+        .iter()
+        .filter(|(_, v)| {
+            v.get("type")
+                .and_then(|t| t.as_str())
+                .map(|t| t == "http" || t == "sse")
+                .unwrap_or(false)
+        })
+        .filter(|(k, _)| k.starts_with(&*cur))
+        .map(|(k, _)| CompletionCandidate::new(k))
+        .collect()
+}
+
 pub(super) fn secrets_completer(current: &OsStr) -> Vec<CompletionCandidate> {
     let cur = current.to_string_lossy();
     match load_app_config_for_completion() {

src/cli/mod.rs

@@ -1,8 +1,8 @@
 mod completer;
 
 use crate::cli::completer::{
-    ShellCompletion, agent_completer, macro_completer, model_completer, rag_completer,
-    role_completer, secrets_completer, session_completer,
+    ShellCompletion, agent_completer, macro_completer, mcp_server_completer, model_completer,
+    rag_completer, role_completer, secrets_completer, session_completer,
 };
 use crate::config::{AssetCategory, InstallFilter, MemoryScope};
 use anyhow::{Context, Result};
@@ -171,6 +171,9 @@ pub struct Cli {
     /// Authenticate with an LLM provider using OAuth (e.g., --authenticate client_name)
     #[arg(long, exclusive = true, value_name = "CLIENT_NAME")]
     pub authenticate: Option<Option<String>>,
+    /// Authenticate with an OAuth-protected remote MCP server (e.g., --auth-mcp server_name)
+    #[arg(long, exclusive = true, value_name = "SERVER_NAME", add = ArgValueCompleter::new(mcp_server_completer))]
+    pub auth_mcp: Option<String>,
     /// Generate static shell completion scripts
     #[arg(long, value_name = "SHELL", value_enum)]
     pub completions: Option<ShellCompletion>,