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diff --git a/crates/detect-core/src/lib.rs b/crates/detect-core/src/lib.rs
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+//! Agent state detection engine, extracted from herdr's `src/detect/`
+//! (Apache-2.0, Copyright herdr contributors).
+//!
+//! The engine is a pure function over a terminal screen snapshot plus OSC
+//! title/progress strings: `detect_agent_with_osc(agent, screen, title,
+//! progress) -> AgentDetection`. Which agent a pane is running is decided by
+//! the caller; `identify_agent` maps a process name to an [`Agent`].
+//!
+//! Detection rules live in declarative TOML manifests (`manifests/`) compiled
+//! into the binary. Locally refreshed manifests (stored by `dingger manifests
+//! update`) and user overrides under `DINGGER_CONFIG_DIR` shadow the bundled
+//! set.
+
+pub mod manifest;
+pub mod manifest_update;
+
+/// The engine's explain/debug surface lives in `manifest` (DetectionExplain,
+/// explain_with_input, agent_state_label); dinggerd itself consumes only
+/// `detect_agent_with_osc`, labels, and the manifest paths.
+/// The detected state of a terminal pane.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+pub enum AgentState {
+    /// Agent finished, prompt visible, nothing happening.
+    Idle,
+    /// Agent is actively working/processing.
+    Working,
+    /// Agent needs human input and is blocked on a response.
+    Blocked,
+    /// Plain shell or unrecognized program.
+    Unknown,
+}
+
+/// Screen-derived agent state plus confidence metadata used for source arbitration.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct AgentDetection {
+    pub state: AgentState,
+    /// True when the current screen is an agent-owned viewer that shows
+    /// transcript/history instead of the live prompt state. Callers must treat
+    /// such a screen as a non-observation: leave the previously published
+    /// state standing instead of applying [`Self::state`].
+    pub skip_state_update: bool,
+    /// True when the current screen visibly shows live idle chrome.
+    pub visible_idle: bool,
+    /// True when the current screen visibly shows live UI chrome that needs
+    /// human input. This is stronger than arbitrary prompt-like text in the
+    /// scrollback and may override a non-blocked integration state.
+    pub visible_blocker: bool,
+    /// True when the current screen visibly shows live working chrome. In
+    /// herdr PTY activity is the normal working authority; dingger is
+    /// screen-only and consumes [`Self::state`] and [`Self::skip_state_update`]
+    /// only.
+    pub visible_working: bool,
+}
+
+/// Which agent we detected running in a pane.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Agent {
+    Pi,
+    Claude,
+    Codex,
+    Gemini,
+    Cursor,
+    Devin,
+    Antigravity,
+    Cline,
+    Omp,
+    Mastracode,
+    OpenCode,
+    GithubCopilot,
+    Kimi,
+    Kiro,
+    Droid,
+    Amp,
+    Grok,
+    Hermes,
+    Kilo,
+    Qodercli,
+    Qwen,
+    Letta,
+    Maki,
+    Muse,
+}
+
+impl Agent {
+    pub const ALL: [Self; 24] = [
+        Self::Pi,
+        Self::Claude,
+        Self::Codex,
+        Self::Gemini,
+        Self::Cursor,
+        Self::Devin,
+        Self::Antigravity,
+        Self::Cline,
+        Self::Omp,
+        Self::Mastracode,
+        Self::OpenCode,
+        Self::GithubCopilot,
+        Self::Kimi,
+        Self::Kiro,
+        Self::Droid,
+        Self::Amp,
+        Self::Grok,
+        Self::Hermes,
+        Self::Kilo,
+        Self::Qodercli,
+        Self::Qwen,
+        Self::Letta,
+        Self::Maki,
+        Self::Muse,
+    ];
+
+    pub const SCREEN_MANIFEST_AGENTS: [Self; 22] = [
+        Self::Pi,
+        Self::Claude,
+        Self::Codex,
+        Self::Gemini,
+        Self::Cursor,
+        Self::Devin,
+        Self::Antigravity,
+        Self::Cline,
+        Self::OpenCode,
+        Self::GithubCopilot,
+        Self::Kimi,
+        Self::Kiro,
+        Self::Droid,
+        Self::Amp,
+        Self::Grok,
+        Self::Hermes,
+        Self::Kilo,
+        Self::Qodercli,
+        Self::Qwen,
+        Self::Letta,
+        Self::Maki,
+        Self::Muse,
+    ];
+}
+
+pub fn agent_label(agent: Agent) -> &'static str {
+    match agent {
+        Agent::Pi => "pi",
+        Agent::Claude => "claude",
+        Agent::Codex => "codex",
+        Agent::Gemini => "gemini",
+        Agent::Cursor => "cursor",
+        Agent::Devin => "devin",
+        Agent::Antigravity => "agy",
+        Agent::Cline => "cline",
+        Agent::Omp => "omp",
+        Agent::Mastracode => "mastracode",
+        Agent::OpenCode => "opencode",
+        Agent::GithubCopilot => "copilot",
+        Agent::Kimi => "kimi",
+        Agent::Kiro => "kiro",
+        Agent::Droid => "droid",
+        Agent::Amp => "amp",
+        Agent::Grok => "grok",
+        Agent::Hermes => "hermes",
+        Agent::Kilo => "kilo",
+        Agent::Qodercli => "qodercli",
+        Agent::Qwen => "qwen",
+        Agent::Letta => "letta",
+        Agent::Maki => "maki",
+        Agent::Muse => "muse",
+    }
+}
+
+pub fn parse_agent_label(agent: &str) -> Option<Agent> {
+    let name = normalized_agent_lookup_name(agent);
+    parse_canonical_agent_label(&name).or_else(|| lookup_agent(&name))
+}
+
+pub(crate) fn parse_canonical_agent_label(label: &str) -> Option<Agent> {
+    let agent = lookup_agent(label)?;
+    (agent_label(agent) == label).then_some(agent)
+}
+
+fn lookup_agent(name: &str) -> Option<Agent> {
+    let name = path_basename(name);
+    match name {
+        "pi" => Some(Agent::Pi),
+        "claude" | "claude-code" => Some(Agent::Claude),
+        "codex" => Some(Agent::Codex),
+        "gemini" => Some(Agent::Gemini),
+        "cursor" | "cursor-agent" => Some(Agent::Cursor),
+        "devin" | "devin-cli" | "devin cli" => Some(Agent::Devin),
+        "agy" | "antigravity" | "antigravity-cli" => Some(Agent::Antigravity),
+        "cline" | ".cline" => Some(Agent::Cline),
+        "omp" => Some(Agent::Omp),
+        "mastracode" | "mastra-code" | "mastra code" => Some(Agent::Mastracode),
+        "opencode" | "opencode2" | "open-code" => Some(Agent::OpenCode),
+        "copilot" | "github-copilot" | "ghcs" => Some(Agent::GithubCopilot),
+        "kimi" | "kimi-code" | "kimi code" => Some(Agent::Kimi),
+        "kiro" | "kiro-cli" => Some(Agent::Kiro),
+        "droid" => Some(Agent::Droid),
+        "amp" | "amp-local" => Some(Agent::Amp),
+        "grok" | "grok-build" => Some(Agent::Grok),
+        "hermes" | "hermes-agent" => Some(Agent::Hermes),
+        "kilo" | "kilo-code" | "kilo code" => Some(Agent::Kilo),
+        "qodercli" | "qoderclicn" | "qoder" | "qodercn" => Some(Agent::Qodercli),
+        "qwen" | "qwen-code" | "qwen code" => Some(Agent::Qwen),
+        "letta" | "letta-code" | "letta code" => Some(Agent::Letta),
+        "maki" => Some(Agent::Maki),
+        "muse" | "muse-code" | "muse-cli" => Some(Agent::Muse),
+        _ if is_muse_versioned_binary(name) => Some(Agent::Muse),
+        _ => None,
+    }
+}
+
+/// Muse's install-dir launcher script resolves the active release and execs
+/// `muse-bin-<version>` (e.g. `muse-bin-0.1.0-R708.1`), so the running
+/// process never carries a bare `muse`/`muse-bin` alias. Require a digit
+/// immediately after the `muse-bin-` prefix so unrelated binaries such as
+/// `muse-binary` or a bare `muse-bin` stay unmatched.
+/// Accepts path-qualified `argv0` values by checking only the basename, since
+/// the launcher may `exec` with an absolute install-dir path.
+fn is_muse_versioned_binary(name: &str) -> bool {
+    path_basename(name)
+        .strip_prefix("muse-bin-")
+        .is_some_and(|rest| rest.starts_with(|c: char| c.is_ascii_digit()))
+}
+
+/// Identify which agent is running from the process name.
+/// Returns `None` for plain shells or unrecognized programs.
+pub fn identify_agent(process_name: &str) -> Option<Agent> {
+    parse_agent_label(process_name)
+}
+
+pub(crate) fn normalized_agent_lookup_name(name: &str) -> String {
+    let mut name = name.trim().to_lowercase();
+    for suffix in [".exe", ".cmd", ".bat", ".ps1", ".js"] {
+        if name.ends_with(suffix) {
+            name.truncate(name.len() - suffix.len());
+            break;
+        }
+    }
+    name
+}
+
+pub(crate) fn path_basename(path: &str) -> &str {
+    path.rsplit(['/', '\\'])
+        .find(|component| !component.is_empty())
+        .unwrap_or(path)
+}
+
+/// Serialize tests that mutate the config/state env vars.
+#[cfg(test)]
+pub fn test_env_lock() -> &'static std::sync::Mutex<()> {
+    static LOCK: std::sync::OnceLock<std::sync::Mutex<()>> = std::sync::OnceLock::new();
+    LOCK.get_or_init(|| std::sync::Mutex::new(()))
+}
+
+/// Detect state using screen content plus OSC title/progress strings.
+/// If `agent` is `None`, returns `Unknown`.
+pub fn detect_agent_with_osc(
+    agent: Option<Agent>,
+    screen_content: &str,
+    osc_title: &str,
+    osc_progress: &str,
+) -> AgentDetection {
+    let Some(agent) = agent else {
+        return AgentDetection {
+            state: AgentState::Unknown,
+            skip_state_update: false,
+            visible_idle: false,
+            visible_blocker: false,
+            visible_working: false,
+        };
+    };
+    manifest::detect_with_osc(
+        agent,
+        manifest::DetectionInput {
+            screen: screen_content,
+            osc_title,
+            osc_progress,
+        },
+    )
+}