feat: print bundled agent skill and hint next cli steps

src/cli/spec.rs

@@ -18,6 +18,7 @@ pub(super) fn command() -> Command {
         )
         .arg(flag("handoff").help("Opt into live handoff for update or remote attach"))
         .arg(flag("default-config").help("Print default configuration and exit"))
+        .arg(flag("skill").help("Print the agent skill file and exit"))
         .arg(
             Arg::new("version")
                 .short('V')
@@ -426,7 +427,7 @@ fn agent_command() -> Command {
                         .last(true),
                 )
                 .after_help(
-                    "The pane must be at its interactive shell prompt. Success means the expected agent was detected in the same terminal and is ready for input.",
+                    "The pane must be at its interactive shell prompt. Success means the expected agent was detected in the same terminal and is ready for input.\n\nnext: herdr agent prompt <TARGET> <TEXT> --wait",
                 ),
         )
         .subcommand(
@@ -568,7 +569,10 @@ fn pane_command() -> Command {
             Command::new("send-text")
                 .about("Send literal text to a pane")
                 .arg(required("pane_id", "PANE_ID"))
-                .arg(required("text", "TEXT")),
+                .arg(required("text", "TEXT"))
+                .after_help(
+                    "next: herdr pane run <PANE_ID> <COMMAND> sends text and Enter in one call",
+                ),
         )
         .subcommand(
             Command::new("send-keys")
@@ -1269,6 +1273,40 @@ mod tests {
             .any(|arg| arg.get_id() == "agent_args"));
     }
 
+    fn long_help(path: &[&str]) -> String {
+        let mut args = vec!["herdr".to_string()];
+        args.extend(path.iter().map(|segment| segment.to_string()));
+        args.push("--help".to_string());
+        let mut output = Vec::new();
+        assert!(
+            super::write_requested_help(&args, &mut output).unwrap(),
+            "help was not handled for herdr {}",
+            path.join(" ")
+        );
+        String::from_utf8(output).unwrap()
+    }
+
+    #[test]
+    fn next_step_hints_render_without_replacing_existing_after_help() {
+        let agent_start = long_help(&["agent", "start"]);
+        assert!(
+            agent_start.contains("The pane must be at its interactive shell prompt."),
+            "agent start dropped its existing after_help: {agent_start}"
+        );
+        assert!(
+            agent_start.contains("next: herdr agent prompt <TARGET> <TEXT> --wait"),
+            "agent start is missing its next-step hint: {agent_start}"
+        );
+
+        let pane_send_text = long_help(&["pane", "send-text"]);
+        assert!(
+            pane_send_text.contains(
+                "next: herdr pane run <PANE_ID> <COMMAND> sends text and Enter in one call"
+            ),
+            "pane send-text is missing its next-step hint: {pane_send_text}"
+        );
+    }
+
     #[test]
     fn completion_generation_succeeds_for_every_supported_shell() {
         for shell in [

src/main.rs

@@ -424,6 +424,9 @@ pane_history = false
 # scrollback_limit_bytes = 10000000
 "##;
 
+// Bundled at build time so the printed skill always matches this binary's release.
+const SKILL: &str = include_str!("../SKILL.md");
+
 fn should_block_nested(config: &config::Config) -> bool {
     should_block_nested_for_env(config, std::env::var(HERDR_ENV_VAR).ok().as_deref())
 }
@@ -477,7 +480,7 @@ fn main() -> io::Result<()> {
         && !args.iter().any(|a| {
             matches!(
                 a.as_str(),
-                "--help" | "-h" | "--version" | "-V" | "--default-config"
+                "--help" | "-h" | "--version" | "-V" | "--default-config" | "--skill"
             )
         })
     {
@@ -637,6 +640,7 @@ fn main() -> io::Result<()> {
         println!("                      Keybindings for --remote app attach (default: local)");
         println!("  --handoff           Opt into live handoff for update or remote attach");
         println!("  --default-config    Print default configuration and exit");
+        println!("  --skill             Print the agent skill file and exit");
         println!("  --version, -V       Print version and exit");
         println!("  --help, -h          Show this help");
         println!();
@@ -644,6 +648,7 @@ fn main() -> io::Result<()> {
         println!("Logs:   {}", logging::help_log_paths_summary());
         println!("Env:    HERDR_CONFIG_PATH overrides config file path");
         println!("Home:   https://herdr.dev");
+        println!("Skill:  herdr --skill prints agent instructions for driving herdr from a pane");
         return Ok(());
     }
 
@@ -657,6 +662,11 @@ fn main() -> io::Result<()> {
         return Ok(());
     }
 
+    if args.iter().any(|a| a == "--skill") {
+        print!("{SKILL}");
+        return Ok(());
+    }
+
     // Reject unknown flags
     let known_flags = [
         "--no-session",
@@ -666,6 +676,7 @@ fn main() -> io::Result<()> {
         "--version",
         "-V",
         "--default-config",
+        "--skill",
         "--help",
         "-h",
     ];