Add Iroh relay mode config

AGENTS.md

@@ -102,10 +102,10 @@ Roadmap items should be actionable and checkable:
 ## Current Feature Boundaries
 
 - Local daemon, local control socket, local identity, local store, local CAS,
-  daemon-owned Iroh endpoint startup, SSH certificate metadata, revocation
-  metadata, user service definitions, and a pinned `geth-iroh` endpoint wrapper
-  exist.
-- Relay policy, mDNS discovery, peer auth over Iroh, cr-sqlite, iroh-docs,
+  daemon-owned Iroh endpoint startup, built-in relay-mode config, SSH
+  certificate metadata, revocation metadata, user service definitions, and a
+  pinned `geth-iroh` endpoint wrapper exist.
+- Custom relay maps, mDNS discovery, peer auth over Iroh, cr-sqlite, iroh-docs,
   iroh-gossip, iroh-blobs, Automerge sync, real auth enforcement, OpenSSH KRL
   generation, and Keyhive/BeeKEM-style authorization are future roadmap items
   unless implemented later.

Cargo.lock

@@ -1090,6 +1090,7 @@ dependencies = [
  "directories",
  "serde",
  "thiserror 2.0.18",
+ "toml_edit",
 ]
 
 [[package]]
@@ -3860,6 +3861,7 @@ dependencies = [
  "indexmap",
  "toml_datetime",
  "toml_parser",
+ "toml_writer",
  "winnow",
 ]
 
@@ -3872,6 +3874,12 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "toml_writer"
+version = "1.1.1+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "756daf9b1013ebe47a8776667b466417e2d4c5679d441c26230efd9ef78692db"
+
 [[package]]
 name = "tower"
 version = "0.5.3"

Cargo.toml

@@ -54,6 +54,7 @@ tempfile = "3"
 thiserror = "2"
 time = { version = "0.3", features = ["formatting", "serde"] }
 tokio = { version = "1", features = ["fs", "io-util", "macros", "net", "rt-multi-thread", "signal", "time"] }
+toml_edit = "0.25.11"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter", "fmt"] }
 

README.md

@@ -22,7 +22,7 @@ geth resource list
 geth cas add ./file
 ```
 
-The daemon owns local identity, the future Iroh endpoint, trust state, resource
+The daemon owns local identity, the Iroh endpoint, trust state, resource
 registry, module router, local metadata store, and synchronized data structures.
 Most non-daemon commands talk to the daemon through a local Unix socket at
 `$GETH_HOME/run/geth.sock`.
@@ -43,6 +43,9 @@ services, not system services.
 
 All remote node-to-node geth communication is designed to happen over Iroh only.
 SSH is not a geth transport backend, and there is no SSH fallback transport.
+The default node config uses Iroh's default relay policy for practical
+connectivity; set `[iroh].relay_mode = "disabled"` for local-only/offline
+development.
 
 SSH keys are used as admin trust anchors and ecosystem integration points.
 OpenSSH, FIDO, and YubiKey-backed keys can sign geth trust objects through
@@ -110,6 +113,7 @@ $GETH_HOME/
   geth.sqlite
   config.toml
   identity/agent.ed25519
+  identity/iroh.ed25519
   cas/blobs/
   run/geth.sock
 ```

crates/geth-cli/src/lib.rs

@@ -507,6 +507,7 @@ fn print_response(response: ControlResponse, json: bool) -> Result<()> {
                 "endpoint: {}",
                 status.endpoint_id.as_deref().unwrap_or("not started")
             );
+            println!("iroh relay: {}", status.iroh_relay_mode);
             println!("iroh: {}", status.iroh);
         }
         ControlResponse::NodeId(node) => {

crates/geth-config/Cargo.toml

@@ -9,3 +9,4 @@ license.workspace = true
 directories.workspace = true
 serde.workspace = true
 thiserror.workspace = true
+toml_edit.workspace = true

crates/geth-config/src/lib.rs

@@ -1,5 +1,14 @@
 use std::path::{Path, PathBuf};
 
+pub const DEFAULT_CONFIG_TOML: &str = r#"# geth local node config
+# Remote node-to-node communication is Iroh-only.
+#
+# relay_mode controls Iroh relay use for practical internet connectivity.
+# Values: "default", "staging", "disabled".
+[iroh]
+relay_mode = "default"
+"#;
+
 #[derive(Clone, Debug)]
 pub struct GethPaths {
     home: PathBuf,
@@ -83,4 +92,106 @@ pub enum ConfigError {
     NoDataDirectory,
     #[error("io error: {0}")]
     Io(#[from] std::io::Error),
+    #[error("toml parse error: {0}")]
+    TomlParse(#[from] toml_edit::TomlError),
+    #[error("invalid iroh relay_mode: {0}")]
+    InvalidRelayMode(String),
+}
+
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct GethConfig {
+    pub iroh: IrohConfig,
+}
+
+impl GethConfig {
+    #[must_use]
+    pub fn default_toml() -> &'static str {
+        DEFAULT_CONFIG_TOML
+    }
+
+    pub fn load(path: &Path) -> Result<Self, ConfigError> {
+        if !path.exists() {
+            return Ok(Self::default());
+        }
+        Self::parse(&std::fs::read_to_string(path)?)
+    }
+
+    pub fn parse(text: &str) -> Result<Self, ConfigError> {
+        let document = text.parse::<toml_edit::DocumentMut>()?;
+        let relay_mode = match document.get("iroh").and_then(|iroh| iroh.get("relay_mode")) {
+            Some(item) => {
+                let value = item
+                    .as_str()
+                    .ok_or_else(|| ConfigError::InvalidRelayMode(item.to_string()))?;
+                RelayMode::parse(value)?
+            }
+            None => RelayMode::default(),
+        };
+
+        Ok(Self {
+            iroh: IrohConfig { relay_mode },
+        })
+    }
+}
+
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct IrohConfig {
+    pub relay_mode: RelayMode,
+}
+
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub enum RelayMode {
+    Disabled,
+    #[default]
+    Default,
+    Staging,
+}
+
+impl RelayMode {
+    pub fn parse(value: &str) -> Result<Self, ConfigError> {
+        match value {
+            "disabled" => Ok(Self::Disabled),
+            "default" => Ok(Self::Default),
+            "staging" => Ok(Self::Staging),
+            other => Err(ConfigError::InvalidRelayMode(other.to_owned())),
+        }
+    }
+
+    #[must_use]
+    pub fn as_str(self) -> &'static str {
+        match self {
+            Self::Disabled => "disabled",
+            Self::Default => "default",
+            Self::Staging => "staging",
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn default_config_uses_iroh_relays() {
+        let config = GethConfig::parse(GethConfig::default_toml()).expect("parse config");
+        assert_eq!(config.iroh.relay_mode, RelayMode::Default);
+    }
+
+    #[test]
+    fn config_parses_disabled_relay_mode() {
+        let config = GethConfig::parse("[iroh]\nrelay_mode = \"disabled\"\n").expect("parse");
+        assert_eq!(config.iroh.relay_mode, RelayMode::Disabled);
+    }
+
+    #[test]
+    fn config_rejects_unknown_relay_mode() {
+        let error = GethConfig::parse("[iroh]\nrelay_mode = \"magic\"\n").expect_err("error");
+        assert!(matches!(error, ConfigError::InvalidRelayMode(value) if value == "magic"));
+    }
+
+    #[test]
+    fn config_rejects_non_string_relay_mode() {
+        let error = GethConfig::parse("[iroh]\nrelay_mode = true\n").expect_err("error");
+        assert!(matches!(error, ConfigError::InvalidRelayMode(_)));
+    }
 }

crates/geth-control/src/lib.rs

@@ -148,6 +148,7 @@ pub struct StatusResponse {
     pub node_id: String,
     pub iroh_enabled: bool,
     pub endpoint_id: Option<String>,
+    pub iroh_relay_mode: String,
     pub iroh: String,
 }
 

crates/geth-iroh/src/lib.rs

@@ -23,9 +23,17 @@ pub struct GethIrohConfig {
 impl GethIrohConfig {
     #[must_use]
     pub fn local(secret_key_path: impl Into<PathBuf>) -> Self {
+        Self::local_with_relay(secret_key_path, GethRelayMode::Default)
+    }
+
+    #[must_use]
+    pub fn local_with_relay(
+        secret_key_path: impl Into<PathBuf>,
+        relay_mode: GethRelayMode,
+    ) -> Self {
         Self {
             secret_key_path: secret_key_path.into(),
-            relay_mode: GethRelayMode::Disabled,
+            relay_mode,
             bind_ipv4: None,
             bind_ipv6: None,
             alpns: all_alpns(),
@@ -49,6 +57,15 @@ impl GethRelayMode {
             Self::Staging => iroh::RelayMode::Staging,
         }
     }
+
+    #[must_use]
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Disabled => "disabled",
+            Self::Default => "default",
+            Self::Staging => "staging",
+        }
+    }
 }
 
 pub struct GethIrohEndpoint {
@@ -90,6 +107,7 @@ pub async fn start_endpoint(config: &GethIrohConfig) -> Result<GethIrohEndpoint,
     let status = EndpointStatus {
         enabled: true,
         endpoint_id: Some(endpoint.node_id().to_string()),
+        relay_mode: config.relay_mode.as_str().to_owned(),
         note: format!(
             "Iroh endpoint started with iroh 0.90.0; relay mode: {:?}",
             config.relay_mode
@@ -143,6 +161,7 @@ pub fn all_alpns() -> Vec<Vec<u8>> {
 pub struct EndpointStatus {
     pub enabled: bool,
     pub endpoint_id: Option<String>,
+    pub relay_mode: String,
     pub note: String,
 }
 
@@ -152,6 +171,7 @@ impl EndpointStatus {
         Self {
             enabled: false,
             endpoint_id: None,
+            relay_mode: "not-started".to_owned(),
             note: "Iroh endpoint is not running outside daemon mode".to_owned(),
         }
     }
@@ -197,15 +217,29 @@ mod tests {
         assert_eq!(first.public(), second.public());
     }
 
+    #[test]
+    fn local_config_selects_relay_mode() {
+        let config = GethIrohConfig::local_with_relay("iroh.ed25519", GethRelayMode::Staging);
+        assert_eq!(config.relay_mode, GethRelayMode::Staging);
+        assert!(matches!(
+            config.relay_mode.to_iroh(),
+            iroh::RelayMode::Staging
+        ));
+    }
+
     #[tokio::test]
     async fn endpoint_status_tracks_node_id_when_bind_is_available() {
         let dir = tempfile::tempdir().expect("tempdir");
-        let config = GethIrohConfig::local(dir.path().join("iroh.ed25519"));
+        let config = GethIrohConfig::local_with_relay(
+            dir.path().join("iroh.ed25519"),
+            GethRelayMode::Disabled,
+        );
         match start_endpoint(&config).await {
             Ok(endpoint) => {
                 let status = endpoint.status();
                 assert!(status.enabled);
                 assert_eq!(status.endpoint_id, Some(endpoint.node_id()));
+                assert_eq!(status.relay_mode, "disabled");
                 endpoint.shutdown().await;
             }
             Err(IrohError::Bind(error)) => {

crates/geth-node/src/lib.rs

@@ -2,13 +2,13 @@ pub mod service;
 
 use geth_auth::AuthExplanation;
 use geth_cas::{LocalCas, hash_path};
-use geth_config::GethPaths;
+use geth_config::{GethConfig, GethPaths, RelayMode};
 use geth_control::{
     CasBlob, ControlRequest, ControlResponse, KeychainStatusResponse, NodeIdResponse,
     StatusResponse,
 };
 use geth_crypto::AgentKey;
-use geth_iroh::{EndpointStatus, GethIrohConfig, GethIrohEndpoint};
+use geth_iroh::{EndpointStatus, GethIrohConfig, GethIrohEndpoint, GethRelayMode};
 use geth_resource::ResourceDescriptor;
 use geth_ssh_identity::{
     SshCertApproval, SshCertKind, SshCertRequest, SshCertRequestStatus, SshCertificateRecord,
@@ -68,10 +68,7 @@ pub struct LocalNode {
 pub fn init_node(paths: &GethPaths) -> Result<LocalNode, NodeError> {
     paths.ensure_base_dirs()?;
     if !paths.config_file().exists() {
-        std::fs::write(
-            paths.config_file(),
-            "# geth local node config\n# Remote node-to-node communication is Iroh-only.\n",
-        )?;
+        std::fs::write(paths.config_file(), GethConfig::default_toml())?;
     }
     let key = AgentKey::load_or_create(&paths.agent_key())?;
     let agent_id = key.agent_id().to_string();
@@ -163,6 +160,7 @@ pub fn handle_request(
             node_id: node.node_id.clone(),
             iroh_enabled: node.iroh_status.enabled,
             endpoint_id: node.iroh_status.endpoint_id.clone(),
+            iroh_relay_mode: node.iroh_status.relay_mode.clone(),
             iroh: node.iroh_status.note.clone(),
         })),
         ControlRequest::NodeId => Ok(ControlResponse::NodeId(NodeIdResponse {
@@ -447,7 +445,10 @@ fn stable_node_id(agent_id: &str) -> String {
 async fn start_daemon_iroh_endpoint(
     node: &mut LocalNode,
 ) -> Result<Option<GethIrohEndpoint>, NodeError> {
-    let config = GethIrohConfig::local(node.paths.iroh_key());
+    let node_config = GethConfig::load(&node.paths.config_file())?;
+    let relay_mode = node_config.iroh.relay_mode;
+    let iroh_relay_mode = config_relay_mode_to_iroh(relay_mode);
+    let config = GethIrohConfig::local_with_relay(node.paths.iroh_key(), iroh_relay_mode);
     match geth_iroh::start_endpoint(&config).await {
         Ok(endpoint) => {
             let status = endpoint.status();
@@ -462,6 +463,7 @@ async fn start_daemon_iroh_endpoint(
             node.iroh_status = EndpointStatus {
                 enabled: false,
                 endpoint_id: None,
+                relay_mode: relay_mode.as_str().to_owned(),
                 note: format!("Iroh endpoint failed to start: {error}"),
             };
             Ok(None)
@@ -469,6 +471,14 @@ async fn start_daemon_iroh_endpoint(
     }
 }
 
+fn config_relay_mode_to_iroh(mode: RelayMode) -> GethRelayMode {
+    match mode {
+        RelayMode::Disabled => GethRelayMode::Disabled,
+        RelayMode::Default => GethRelayMode::Default,
+        RelayMode::Staging => GethRelayMode::Staging,
+    }
+}
+
 fn expected_openssh_cert_path(public_key_path: &Path) -> String {
     let text = public_key_path.display().to_string();
     if let Some(prefix) = text.strip_suffix(".pub") {

crates/geth/tests/bootstrap.rs

@@ -59,6 +59,11 @@ fn geth_init_in_temp_home() {
     assert!(home.path().join("geth.sqlite").exists());
     assert!(home.path().join("identity/agent.ed25519").exists());
     assert!(home.path().join("config.toml").exists());
+    assert!(
+        std::fs::read_to_string(home.path().join("config.toml"))
+            .expect("read config")
+            .contains("relay_mode = \"default\"")
+    );
 }
 
 #[test]
@@ -68,6 +73,11 @@ fn geth_status_against_running_daemon() {
         return;
     }
     assert!(run_geth(home.path(), &["init"]).status.success());
+    std::fs::write(
+        home.path().join("config.toml"),
+        "[iroh]\nrelay_mode = \"disabled\"\n",
+    )
+    .expect("write config");
     let mut daemon = spawn_daemon(home.path());
     wait_for_socket(&home.path().join("run/geth.sock"));
 
@@ -84,6 +94,7 @@ fn geth_status_against_running_daemon() {
     assert!(stdout.contains("geth daemon: running"));
     assert!(stdout.contains("agent:"));
     assert!(stdout.contains("endpoint:"));
+    assert!(stdout.contains("iroh relay: disabled"));
 }
 
 #[test]

docs/architecture.md

@@ -2,8 +2,8 @@
 
 `geth` is a single-binary local-first mesh runtime. One executable provides both
 daemon mode and control mode. The daemon owns local identity, metadata storage,
-the future shared Iroh endpoint, resource registry, module routing, and local
-control socket. Control commands connect to the Unix socket and send typed JSONL
+the shared Iroh endpoint, resource registry, module routing, and local control
+socket. Control commands connect to the Unix socket and send typed JSONL
 requests.
 
 Service management is also exposed through the single binary. `geth daemon
@@ -23,8 +23,9 @@ Rust-1.85-compatible candidates in the 0.93-0.95 range failed to compile through
 a transitive `ed25519-dalek` prerelease dependency. `geth-iroh` wraps
 `iroh::Endpoint::builder()`, configures geth ALPNs with `Builder::alpns`, uses
 `Builder::relay_mode`, persists an `iroh::SecretKey` as hex-encoded 32-byte key
-material, and shuts down through `Endpoint::close().await`. Relay mode defaults
-to disabled until daemon policy and discovery are implemented.
+material, and shuts down through `Endpoint::close().await`. The default config
+uses Iroh's default relay policy; local-only/offline development can set
+`[iroh].relay_mode = "disabled"`.
 
 The target product should use Iroh relay support for practical internet
 connectivity and mDNS/LAN discovery for local networks. These are connectivity

docs/roadmap.md

@@ -74,14 +74,20 @@ geth-to-geth connections without granting trust from discovery alone.
   - Endpoint identity is bound to agent/node identity in local metadata.
   - Restarting the daemon preserves higher-level node identity.
 
-- `[ ]` Relay policy and configuration.
+- `[x]` Built-in relay policy and configuration.
   Acceptance criteria:
-  - Config can select disabled, default Iroh relays, staging relays, and future
-    custom relay maps.
+  - Config can select disabled, default Iroh relays, and staging relays.
   - The intended product default uses relays unless explicitly disabled.
   - `geth status --json` reports the selected relay mode.
   - Tests cover config parsing and endpoint builder relay-mode selection.
 
+- `[ ]` Custom relay maps.
+  Acceptance criteria:
+  - Config can define and select named custom relay maps.
+  - Invalid relay URLs fail config validation with clear errors.
+  - Status output identifies the selected custom relay map without exposing
+    unrelated config.
+
 - `[ ]` LAN mDNS discovery.
   Acceptance criteria:
   - The daemon can advertise and discover local geth peer cards over mDNS.