diff --git a/src/cli.rs b/src/cli.rs
index 54c4d81..c97890e 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -195,6 +195,12 @@ pub enum Command {
         /// Agent name or alias
         agent: String,
     },
+    /// Generate a local agent-manager.yaml for the current directory
+    Init {
+        /// Overwrite an existing agent-manager.yaml
+        #[arg(long)]
+        force: bool,
+    },
     /// Display help: the overview, a command, the command list, or a search
     Help {
         /// Command name (also accepts an agent name or alias); "commands" lists every command
diff --git a/src/commands/init_cmd.rs b/src/commands/init_cmd.rs
new file mode 100644
index 0000000..bee87e0
--- /dev/null
+++ b/src/commands/init_cmd.rs
@@ -0,0 +1,70 @@
+//! init: generate a local agent-manager.yaml for the current directory,
+//! based on the detected technology stack.
+
+use super::*;
+use crate::context;
+use anyhow::{anyhow, Context, Result};
+use std::path::{Path, PathBuf};
+
+/// Generate a local config file in dir; refuses to overwrite unless force.
+/// Returns the written path.
+pub fn generate(dir: &Path, force: bool) -> Result<PathBuf> {
+    let target = dir.join(crate::config::LOCAL_CONFIG_NAME);
+    if target.exists() && !force {
+        return Err(anyhow!(
+            "{} already exists — use --force to overwrite it",
+            target.display()
+        ));
+    }
+    let ctx = context::detect(dir);
+    let agents = context::recommended_agents(&ctx.stack);
+    let members = agents
+        .iter()
+        .map(|a| a.to_string())
+        .collect::<Vec<_>>()
+        .join(", ");
+    let stack = if ctx.stack.is_empty() {
+        "aucune détectée".to_string()
+    } else {
+        ctx.stack.join(", ")
+    };
+    let content = format!(
+        "# Généré par 'am init' le {date}
+# Pile détectée : {stack}
+version: \"1.0\"
+groups:
+  dev: [{members}]
+agents: []
+",
+        date = crate::installers::now_rfc3339(),
+    );
+    std::fs::write(&target, content)
+        .with_context(|| format!("cannot write {}", target.display()))?;
+    Ok(target)
+}
+
+pub fn run(app: &App, force: bool) -> Result<i32> {
+    if app.dry_run() {
+        app.log.dry(format!(
+            "would generate {} in the current directory",
+            crate::config::LOCAL_CONFIG_NAME
+        ));
+        return Ok(0);
+    }
+    let cwd = std::env::current_dir().context("cannot determine the current directory")?;
+    let ctx = context::detect(&cwd);
+    let path = generate(&cwd, force)?;
+    app.log.success(&format!(
+        "wrote {} (stack: {})",
+        path.display(),
+        if ctx.stack.is_empty() {
+            "aucune détectée".to_string()
+        } else {
+            ctx.stack.join(", ")
+        }
+    ));
+    app.log.info(&format!(
+        "group 'dev' prêt : am start group:dev — ajustez ensuite la config générée"
+    ));
+    Ok(0)
+}
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index dcbbce7..75d5684 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -7,6 +7,7 @@ pub mod export_import;
 pub mod help_cmd;
 pub mod history_cmd;
 pub mod info_cmd;
+pub mod init_cmd;
 pub mod install_cmd;
 pub mod list_cmd;
 pub mod log_cmd;
@@ -96,6 +97,7 @@ pub fn execute_command(app: &App, cmd: &Command) -> Result<i32> {
             *limit,
         ),
         Command::Info { agent } => info_cmd::run(app, agent),
+        Command::Init { force } => init_cmd::run(app, *force),
         Command::Help { command, find } => help_cmd::run(app, command.as_deref(), find.as_deref()),
         Command::Version => version_cmd::run(app),
         Command::Config(sub) => config_cmd::run(app, sub),
diff --git a/src/commands/run_cmd.rs b/src/commands/run_cmd.rs
index 0c0d6b7..ad6583b 100644
--- a/src/commands/run_cmd.rs
+++ b/src/commands/run_cmd.rs
@@ -39,6 +39,7 @@ fn start_one(
     let exec = resolve_exec(app, agent, extra_args, extra_env)?;
     let bin = PathBuf::from(&exec.program);
     let is_managed = app.state.get(&agent.name).ok().flatten().is_some();
+    let ctx = crate::context::detect(&std::env::current_dir().unwrap_or_default());
     if background {
         let pid = process::spawn_background(app, &agent.name, &bin, &exec.args, &exec.env)?;
         if app.dry_run() {
@@ -59,6 +60,7 @@ fn start_one(
                 .with_pid(pid)
                 .with_session(crate::repl::session_id())
                 .with_cwd(cwd_string())
+                .with_project(ctx.root.clone())
                 .with_args(exec.args.clone())
                 .with_env_keys(events::env_keys(&exec.env)),
         );
@@ -71,6 +73,7 @@ fn start_one(
             &agent.name,
             pid,
             cwd_string(),
+            ctx.root.clone(),
             exec.args.clone(),
             events::env_keys(&exec.env),
             Some(log.display().to_string()),
@@ -107,6 +110,7 @@ fn start_one(
             &Event::now(EventKind::Run)
                 .with_agent(agent.name.clone())
                 .with_cwd(cwd_string())
+                .with_project(ctx.root.clone())
                 .with_args(exec.args.clone())
                 .with_env_keys(events::env_keys(&exec.env))
                 .with_exit_code(code)
diff --git a/src/context.rs b/src/context.rs
new file mode 100644
index 0000000..d252916
--- /dev/null
+++ b/src/context.rs
@@ -0,0 +1,153 @@
+//! Project context detection: git root + branch and the technology
+//! stack of a directory (marker files). Cached per process so repeated
+//! calls (event emission, sessions) never re-run subprocesses.
+
+use serde::Serialize;
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::sync::{Mutex, OnceLock};
+
+#[derive(Debug, Clone, Default, PartialEq, Serialize)]
+pub struct ProjectContext {
+    /// Root of the enclosing git repository (or None).
+    pub root: Option<String>,
+    /// Current branch (or None).
+    pub branch: Option<String>,
+    /// Detected technology stack, e.g. ["rust", "node"].
+    pub stack: Vec<String>,
+}
+
+/// Marker file -> stack label. Checked walking up from the directory to the
+/// filesystem root; the first directory containing a marker wins.
+const MARKERS: &[(&str, &str)] = &[
+    ("Cargo.toml", "rust"),
+    ("package.json", "node"),
+    ("pyproject.toml", "python"),
+    ("requirements.txt", "python"),
+    ("setup.py", "python"),
+    ("go.mod", "go"),
+    ("bun.lockb", "bun"),
+    ("bun.lock", "bun"),
+    ("Gemfile", "ruby"),
+];
+
+static CACHE: OnceLock<Mutex<HashMap<PathBuf, ProjectContext>>> = OnceLock::new();
+
+fn cache() -> &'static Mutex<HashMap<PathBuf, ProjectContext>> {
+    CACHE.get_or_init(|| Mutex::new(HashMap::new()))
+}
+
+/// Detect the project context of a directory (cached per process).
+pub fn detect(cwd: &Path) -> ProjectContext {
+    if let Some(hit) = cache().lock().unwrap().get(cwd).cloned() {
+        return hit;
+    }
+    let ctx = detect_uncached(cwd);
+    cache().lock().unwrap().insert(cwd.to_path_buf(), ctx.clone());
+    ctx
+}
+
+fn detect_uncached(cwd: &Path) -> ProjectContext {
+    let (root, branch) = git_info(cwd);
+    let stack = detect_stack(cwd);
+    ProjectContext {
+        root,
+        branch,
+        stack,
+    }
+}
+
+/// Git root and branch via git subprocesses (best effort, silent).
+fn git_info(cwd: &Path) -> (Option<String>, Option<String>) {
+    let root = std::process::Command::new("git")
+        .args(["rev-parse", "--show-toplevel"])
+        .current_dir(cwd)
+        .output()
+        .ok()
+        .filter(|o| o.status.success())
+        .map(|o| String::from_utf8_lossy(&o.stdout).trim().to_string());
+    let branch = std::process::Command::new("git")
+        .args(["branch", "--show-current"])
+        .current_dir(cwd)
+        .output()
+        .ok()
+        .filter(|o| o.status.success())
+        .map(|o| String::from_utf8_lossy(&o.stdout).trim().to_string())
+        .filter(|b| !b.is_empty());
+    (root, branch)
+}
+
+/// Walk up from cwd collecting stack labels from marker files.
+pub fn detect_stack(cwd: &Path) -> Vec<String> {
+    let mut dir = Some(cwd);
+    let mut out: Vec<String> = Vec::new();
+    while let Some(d) = dir {
+        for (marker, label) in MARKERS {
+            if d.join(marker).is_file() && !out.iter().any(|s| s == label) {
+                out.push(label.to_string());
+            }
+        }
+        dir = d.parent();
+    }
+    out.sort();
+    out
+}
+
+/// Agents recommended for a detected stack (catalog slugs).
+pub fn recommended_agents(stack: &[String]) -> Vec<&'static str> {
+    let mut out: Vec<&'static str> = Vec::new();
+    if stack.contains(&"rust".to_string()) {
+        out.push("smelt");
+    }
+    if stack.contains(&"python".to_string()) {
+        out.push("aider");
+    }
+    if stack.contains(&"node".to_string()) {
+        out.push("claude-code");
+    }
+    if out.is_empty() {
+        out.push("claude-code");
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn detects_stack_from_markers() {
+        let dir = tempfile::tempdir().unwrap();
+        std::fs::write(dir.path().join("Cargo.toml"), "[package]").unwrap();
+        std::fs::write(dir.path().join("package.json"), "{}").unwrap();
+        let stack = detect_stack(dir.path());
+        assert_eq!(stack, vec!["node".to_string(), "rust".to_string()]);
+        assert_eq!(recommended_agents(&stack), vec!["smelt", "claude-code"]);
+    }
+
+    #[test]
+    fn walks_up_to_parent_directories() {
+        let dir = tempfile::tempdir().unwrap();
+        std::fs::write(dir.path().join("go.mod"), "").unwrap();
+        let sub = dir.path().join("src/deep");
+        std::fs::create_dir_all(&sub).unwrap();
+        let stack = detect_stack(&sub);
+        assert_eq!(stack, vec!["go".to_string()]);
+    }
+
+    #[test]
+    fn empty_dir_recommends_default() {
+        let dir = tempfile::tempdir().unwrap();
+        let stack = detect_stack(dir.path());
+        assert!(stack.is_empty());
+        assert_eq!(recommended_agents(&stack), vec!["claude-code"]);
+    }
+
+    #[test]
+    fn cache_returns_same_context() {
+        let dir = tempfile::tempdir().unwrap();
+        let a = detect(dir.path());
+        let b = detect(dir.path());
+        assert_eq!(a, b);
+    }
+}
diff --git a/src/events.rs b/src/events.rs
index ef868b7..9d27ffc 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -113,8 +113,8 @@ impl Event {
         self
     }
 
-    pub fn with_project(mut self, project: impl Into<String>) -> Self {
-        self.project = Some(project.into());
+    pub fn with_project(mut self, project: Option<String>) -> Self {
+        self.project = project;
         self
     }
 
diff --git a/src/help.rs b/src/help.rs
index 714dc33..4610a16 100644
--- a/src/help.rs
+++ b/src/help.rs
@@ -296,6 +296,23 @@ pub static HELP_SPECS: &[HelpSpec] = &[
             HelpExample { desc: "Use an alias.", code: "info cc" },
         ],
     },
+    HelpSpec {
+        name: "init",
+        category: "Commands",
+        usage: "init {flags}",
+        about: "Generate a local agent-manager.yaml for the current directory, based on the detected stack.",
+        search_terms: &["project", "setup", "scaffold"],
+        flags: &[
+            HelpFlag { short: "", long: "--force", value: "", desc: "Overwrite an existing agent-manager.yaml" },
+        ],
+        subcommands: &[],
+        parameters: &[],
+        io: None,
+        examples: &[
+            HelpExample { desc: "Generate a project config.", code: "init" },
+            HelpExample { desc: "Regenerate over an existing one.", code: "init --force" },
+        ],
+    },
     HelpSpec {
         name: "install",
         category: "Commands",
diff --git a/src/lib.rs b/src/lib.rs
index 85b1a62..180434e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,6 +16,7 @@ pub mod catalog;
 pub mod cli;
 pub mod commands;
 pub mod config;
+pub mod context;
 pub mod deps;
 pub mod doctor;
 pub mod download;
diff --git a/src/repl.rs b/src/repl.rs
index 679318f..16c8ae7 100644
--- a/src/repl.rs
+++ b/src/repl.rs
@@ -64,6 +64,7 @@ const COMMAND_DESCRIPTIONS: &[(&str, &str)] = &[
     ("stats", "usage statistics"),
     ("log", "read the event journal"),
     ("history", "search command history"),
+    ("init", "generate a project config"),
     ("search", "search the catalog"),
     ("info", "agent details"),
     ("install", "install an agent"),
@@ -140,7 +141,7 @@ impl AmCompleter {
         Self {
             theme: std::cell::Cell::new(crate::theme::default_theme()),
             commands: vec![
-                "list", "status", "sessions", "stats", "log", "history", "search", "info", "install", "uninstall", "update",
+                "list", "status", "sessions", "stats", "log", "history", "init", "search", "info", "install", "uninstall", "update",
                 "start", "stop", "restart", "run", "doctor", "config", "completion",
                 "self-update", "self-uninstall", "export", "import", "shell", "theme",
                 "ls", "dir", "cd", "ps", "where", "get", "help", "version", "exit",
@@ -1199,6 +1200,31 @@ fn handle_line(
         "status" => Command::Status {
             agent: rest.first().cloned(),
         },
+        "sessions" => Command::Sessions {
+            agent: rest.first().cloned(),
+            project: opt_value("--project"),
+            status: opt_value("--status"),
+            show: opt_value("--show"),
+        },
+        "stats" => Command::Stats {
+            agent: rest.first().cloned(),
+            period: opt_value("--period"),
+        },
+        "log" => Command::Log {
+            agent: rest.first().cloned(),
+            kind: opt_value("--kind"),
+            since: opt_value("--since"),
+            limit: opt_value("--limit").and_then(|v| v.parse().ok()).unwrap_or(50),
+        },
+        "history" => Command::History {
+            kind: opt_value("--kind"),
+            cwd: opt_value("--cwd"),
+            search: opt_value("--search"),
+            failed: flag("--failed"),
+            session: opt_value("--session"),
+            limit: opt_value("--limit").and_then(|v| v.parse().ok()).unwrap_or(100),
+        },
+        "init" => Command::Init { force: flag("--force") },
         "search" => Command::Search {
             keyword: rest.join(" "),
             category: None,
@@ -1308,6 +1334,7 @@ fn is_am_command(word: &str) -> bool {
             | "stats"
             | "log"
             | "history"
+            | "init"
             | "search"
             | "info"
             | "install"
diff --git a/src/sessions.rs b/src/sessions.rs
index 7343bbd..fc60928 100644
--- a/src/sessions.rs
+++ b/src/sessions.rs
@@ -107,6 +107,7 @@ pub fn start_agent(
     agent: &str,
     pid: u32,
     cwd: Option<String>,
+    project: Option<String>,
     args: Vec<String>,
     env_keys: Vec<String>,
     log: Option<String>,
@@ -121,7 +122,7 @@ pub fn start_agent(
             agent: Some(agent.to_string()),
             pid: Some(pid),
             cwd,
-            project: None,
+            project,
             started_at: crate::installers::now_rfc3339(),
             ended_at: None,
             exit_code: None,
@@ -283,7 +284,7 @@ mod tests {
     #[test]
     fn agent_session_lifecycle() {
         let app = test_app("sess");
-        let id = start_agent(&app, "claude-code", 4242, Some("/tmp".into()), vec![], vec![], None).unwrap();
+        let id = start_agent(&app, "claude-code", 4242, Some("/tmp".into()), None, vec![], vec![], None).unwrap();
         let sf = load(&app).unwrap();
         let r = sf.sessions.get(&id).unwrap();
         assert_eq!(r.status, "running");
@@ -302,7 +303,7 @@ mod tests {
     #[test]
     fn reconcile_marks_dead_pid_interrupted() {
         let app = test_app("recon");
-        let id = start_agent(&app, "aider", u32::MAX - 1, None, vec![], vec![], None).unwrap();
+        let id = start_agent(&app, "aider", u32::MAX - 1, None, None, vec![], vec![], None).unwrap();
         let changed = reconcile(&app).unwrap();
         assert_eq!(changed, 1);
         let sf = load(&app).unwrap();
@@ -321,8 +322,8 @@ mod tests {
     #[test]
     fn finish_matches_by_pid_first() {
         let app = test_app("multi");
-        start_agent(&app, "jcode", 100, None, vec![], vec![], None).unwrap();
-        start_agent(&app, "jcode", 200, None, vec![], vec![], None).unwrap();
+        start_agent(&app, "jcode", 100, None, None, vec![], vec![], None).unwrap();
+        start_agent(&app, "jcode", 200, None, None, vec![], vec![], None).unwrap();
         finish_agent(&app, "jcode", Some(200), 1, false).unwrap();
         let sf = load(&app).unwrap();
         let stopped: Vec<_> = sf
diff --git a/tests/init_test.rs b/tests/init_test.rs
new file mode 100644
index 0000000..ca7ba68
--- /dev/null
+++ b/tests/init_test.rs
@@ -0,0 +1,46 @@
+//! init + context detection.
+
+mod common;
+
+use agent_manager::commands::init_cmd;
+use agent_manager::context;
+
+#[test]
+fn context_detects_stack_from_markers() {
+    let dir = tempfile::tempdir().unwrap();
+    std::fs::write(dir.path().join("Cargo.toml"), "[package]").unwrap();
+    std::fs::write(dir.path().join("package.json"), "{}").unwrap();
+    let stack = context::detect_stack(dir.path());
+    assert_eq!(stack, vec!["node".to_string(), "rust".to_string()]);
+    assert_eq!(context::recommended_agents(&stack), vec!["smelt", "claude-code"]);
+}
+
+#[test]
+fn generate_writes_valid_config_and_refuses_overwrite() {
+    let dir = tempfile::tempdir().unwrap();
+    std::fs::write(dir.path().join("Cargo.toml"), "[package]").unwrap();
+    let path = init_cmd::generate(dir.path(), false).unwrap();
+    assert!(path.ends_with("agent-manager.yaml"));
+    let text = std::fs::read_to_string(&path).unwrap();
+    assert!(text.contains(r#"version: "1.0""#), "config valide: {text}");
+    assert!(text.contains("smelt"), "agent recommande pour rust: {text}");
+    // Un second appel sans --force échoue.
+    assert!(init_cmd::generate(dir.path(), false).is_err());
+    // Avec --force, il écrase.
+    assert!(init_cmd::generate(dir.path(), true).is_ok());
+}
+
+#[test]
+fn generate_uses_default_for_empty_dir() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = init_cmd::generate(dir.path(), false).unwrap();
+    let text = std::fs::read_to_string(&path).unwrap();
+    assert!(text.contains("claude-code"), "default agent: {text}");
+}
+
+#[test]
+fn command_runs_dry() {
+    let app = common::test_app("initdry", &["init", "--dry-run"]);
+    let code = init_cmd::run(&app, false).unwrap();
+    assert_eq!(code, 0);
+}
diff --git a/tests/sessions_test.rs b/tests/sessions_test.rs
index 00b7877..61412d8 100644
--- a/tests/sessions_test.rs
+++ b/tests/sessions_test.rs
@@ -34,6 +34,7 @@ fn agent_session_roundtrip_and_counter() {
         "claude-code",
         4242,
         Some("/tmp".to_string()),
+        None,
         vec![],
         vec![],
         None,
@@ -56,7 +57,7 @@ fn agent_session_roundtrip_and_counter() {
 #[test]
 fn command_lists_sessions() {
     let app = common::test_app("sesscmd", &["sessions"]);
-    sessions::start_agent(&app, "aider", 4242, None, vec![], vec![], None).unwrap();
+    sessions::start_agent(&app, "aider", 4242, None, None, vec![], vec![], None).unwrap();
     let code = sessions_cmd::run(&app, None, None, None, None).unwrap();
     assert_eq!(code, 0);
     // --json path returns the row set without error.
@@ -66,7 +67,7 @@ fn command_lists_sessions() {
 #[test]
 fn show_one_accepts_known_id() {
     let app = common::test_app("sessshow", &["sessions"]);
-    let id = sessions::start_agent(&app, "jcode", 99, None, vec![], vec![], None).unwrap();
+    let id = sessions::start_agent(&app, "jcode", 99, None, None, vec![], vec![], None).unwrap();
     let code = sessions_cmd::run(&app, None, None, None, Some(&id)).unwrap();
     assert_eq!(code, 0);
 }