diff --git a/src/core/types.rs b/src/core/types.rs
index 12cd69b..5f329c2 100644
--- a/src/core/types.rs
+++ b/src/core/types.rs
@@ -110,6 +110,79 @@ impl ServerInfo {
     }
 }
 
+// ── Profile metadata ────────────────────────────────────────────────
+
+/// Nostr profile metadata for server identity (NIP-01 kind 0 / CEP-23).
+///
+/// Opt-in profile that servers can publish so clients see a human-friendly
+/// identity on the Nostr network. Serialized as the content of a kind 0 event.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[non_exhaustive]
+pub struct ProfileMetadata {
+    /// Display name.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+    /// Short description or bio.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub about: Option<String>,
+    /// Avatar / profile picture URL.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub picture: Option<String>,
+    /// Banner image URL.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub banner: Option<String>,
+    /// Website URL.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub website: Option<String>,
+    /// NIP-05 verification identifier (e.g. `user@example.com`).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub nip05: Option<String>,
+    /// Lightning address for payments (LUD-16).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub lud16: Option<String>,
+    /// Arbitrary additional fields preserved across round-trips.
+    #[serde(flatten)]
+    pub extra: HashMap<String, serde_json::Value>,
+}
+
+impl ProfileMetadata {
+    /// Set the display name.
+    pub fn with_name(mut self, name: impl Into<String>) -> Self {
+        self.name = Some(name.into());
+        self
+    }
+    /// Set the description / bio.
+    pub fn with_about(mut self, about: impl Into<String>) -> Self {
+        self.about = Some(about.into());
+        self
+    }
+    /// Set the avatar URL.
+    pub fn with_picture(mut self, picture: impl Into<String>) -> Self {
+        self.picture = Some(picture.into());
+        self
+    }
+    /// Set the banner image URL.
+    pub fn with_banner(mut self, banner: impl Into<String>) -> Self {
+        self.banner = Some(banner.into());
+        self
+    }
+    /// Set the website URL.
+    pub fn with_website(mut self, website: impl Into<String>) -> Self {
+        self.website = Some(website.into());
+        self
+    }
+    /// Set the NIP-05 verification identifier.
+    pub fn with_nip05(mut self, nip05: impl Into<String>) -> Self {
+        self.nip05 = Some(nip05.into());
+        self
+    }
+    /// Set the Lightning address (LUD-16).
+    pub fn with_lud16(mut self, lud16: impl Into<String>) -> Self {
+        self.lud16 = Some(lud16.into());
+        self
+    }
+}
+
 // ── Client session ──────────────────────────────────────────────────
 
 /// Client session state tracked by the server transport.
@@ -619,4 +692,67 @@ mod tests {
         session.update_activity();
         assert!(session.last_activity > first);
     }
+
+    #[test]
+    fn test_profile_metadata_serde_roundtrip() {
+        let meta = ProfileMetadata {
+            name: Some("My Server".to_string()),
+            about: Some("Does things".to_string()),
+            picture: Some("https://example.com/pic.png".to_string()),
+            banner: Some("https://example.com/banner.png".to_string()),
+            website: Some("https://example.com".to_string()),
+            nip05: Some("server@example.com".to_string()),
+            lud16: Some("server@getalby.com".to_string()),
+            extra: HashMap::new(),
+        };
+        let json_str = serde_json::to_string(&meta).unwrap();
+        let parsed: ProfileMetadata = serde_json::from_str(&json_str).unwrap();
+        assert_eq!(parsed.name, meta.name);
+        assert_eq!(parsed.about, meta.about);
+        assert_eq!(parsed.picture, meta.picture);
+        assert_eq!(parsed.banner, meta.banner);
+        assert_eq!(parsed.website, meta.website);
+        assert_eq!(parsed.nip05, meta.nip05);
+        assert_eq!(parsed.lud16, meta.lud16);
+    }
+
+    #[test]
+    fn test_profile_metadata_default_serializes_empty() {
+        let meta = ProfileMetadata::default();
+        let json_str = serde_json::to_string(&meta).unwrap();
+        assert_eq!(json_str, "{}");
+    }
+
+    #[test]
+    fn test_profile_metadata_preserves_custom_fields() {
+        let json_str = r#"{"name":"Srv","custom_flag":true,"rank":42}"#;
+        let parsed: ProfileMetadata = serde_json::from_str(json_str).unwrap();
+        assert_eq!(parsed.name, Some("Srv".to_string()));
+        assert_eq!(parsed.extra.get("custom_flag"), Some(&json!(true)));
+        assert_eq!(parsed.extra.get("rank"), Some(&json!(42)));
+
+        let reserialized = serde_json::to_string(&parsed).unwrap();
+        let reparsed: serde_json::Value = serde_json::from_str(&reserialized).unwrap();
+        assert_eq!(reparsed["custom_flag"], json!(true));
+        assert_eq!(reparsed["rank"], json!(42));
+    }
+
+    #[test]
+    fn test_profile_metadata_builder() {
+        let meta = ProfileMetadata::default()
+            .with_name("Test")
+            .with_about("Bio")
+            .with_picture("https://pic.url")
+            .with_banner("https://banner.url")
+            .with_website("https://web.url")
+            .with_nip05("user@example.com")
+            .with_lud16("user@getalby.com");
+        assert_eq!(meta.name.as_deref(), Some("Test"));
+        assert_eq!(meta.about.as_deref(), Some("Bio"));
+        assert_eq!(meta.picture.as_deref(), Some("https://pic.url"));
+        assert_eq!(meta.banner.as_deref(), Some("https://banner.url"));
+        assert_eq!(meta.website.as_deref(), Some("https://web.url"));
+        assert_eq!(meta.nip05.as_deref(), Some("user@example.com"));
+        assert_eq!(meta.lud16.as_deref(), Some("user@getalby.com"));
+    }
 }
diff --git a/src/discovery/mod.rs b/src/discovery/mod.rs
index d5ffa3a..87e76aa 100644
--- a/src/discovery/mod.rs
+++ b/src/discovery/mod.rs
@@ -42,12 +42,18 @@ pub struct ServerAnnouncement {
     pub pubkey: String,
     /// Parsed public key.
     pub pubkey_parsed: PublicKey,
-    /// Server information from the announcement content.
+    /// Server information extracted from the announcement content.
     pub server_info: ServerInfo,
     /// The Nostr event ID of the announcement.
     pub event_id: EventId,
     /// When the announcement was created.
     pub created_at: Timestamp,
+    /// MCP protocol version (present when content is a full `InitializeResult`).
+    pub protocol_version: Option<String>,
+    /// Server capabilities (present when content is a full `InitializeResult`).
+    pub capabilities: Option<serde_json::Value>,
+    /// Human-readable instructions (present when content is a full `InitializeResult`).
+    pub instructions: Option<String>,
 }
 
 /// Discover MCP servers by fetching kind 11316 announcement events from relays.
@@ -64,13 +70,17 @@ pub async fn discover_servers(
 
     let mut announcements = Vec::new();
     for event in events {
-        let server_info: ServerInfo = serde_json::from_str(&event.content).unwrap_or_default();
+        let (server_info, protocol_version, capabilities, instructions) =
+            parse_announcement_content(&event.content);
         announcements.push(ServerAnnouncement {
             pubkey: event.pubkey.to_hex(),
             pubkey_parsed: event.pubkey,
             server_info,
             event_id: event.id,
             created_at: event.created_at,
+            protocol_version,
+            capabilities,
+            instructions,
         });
     }
 
@@ -165,6 +175,72 @@ pub async fn discover_resource_templates_typed(
 
 // ── Internal ────────────────────────────────────────────────────────
 
+/// Parse kind 11316 event content, supporting two formats:
+///
+/// - **New (InitializeResult):** `{ "protocolVersion": "…", "capabilities": {…},
+///   "serverInfo": {…}, "instructions": "…" }` — used when the server publishes
+///   the full MCP InitializeResult as content.
+/// - **Legacy (ServerInfo):** `{ "name": "…", "version": "…", … }` — the original
+///   rs-sdk format where content is just `ServerInfo`.
+fn parse_announcement_content(
+    content: &str,
+) -> (
+    ServerInfo,
+    Option<String>,
+    Option<serde_json::Value>,
+    Option<String>,
+) {
+    let Ok(value) = serde_json::from_str::<serde_json::Value>(content) else {
+        return (ServerInfo::default(), None, None, None);
+    };
+
+    // Detect new format by the presence of "protocolVersion" (camelCase from rmcp).
+    if value.get("protocolVersion").is_some() {
+        let server_info = value
+            .get("serverInfo")
+            .map(server_info_from_implementation)
+            .unwrap_or_default();
+        let protocol_version = value
+            .get("protocolVersion")
+            .and_then(|v| v.as_str())
+            .map(String::from);
+        let capabilities = value.get("capabilities").cloned();
+        let instructions = value
+            .get("instructions")
+            .and_then(|v| v.as_str())
+            .map(String::from);
+        (server_info, protocol_version, capabilities, instructions)
+    } else {
+        // Legacy: content is a flat ServerInfo object.
+        let server_info = serde_json::from_value::<ServerInfo>(value).unwrap_or_default();
+        (server_info, None, None, None)
+    }
+}
+
+/// Map an rmcp `Implementation` JSON object to our `ServerInfo`.
+///
+/// Field mapping: `name`→`name`, `version`→`version`,
+/// `websiteUrl`→`website`, `description`→`about`. The `picture` field has no
+/// equivalent in `Implementation` so it is left `None`.
+fn server_info_from_implementation(val: &serde_json::Value) -> ServerInfo {
+    ServerInfo {
+        name: val.get("name").and_then(|v| v.as_str()).map(String::from),
+        version: val
+            .get("version")
+            .and_then(|v| v.as_str())
+            .map(String::from),
+        website: val
+            .get("websiteUrl")
+            .and_then(|v| v.as_str())
+            .map(String::from),
+        about: val
+            .get("description")
+            .and_then(|v| v.as_str())
+            .map(String::from),
+        picture: None,
+    }
+}
+
 async fn fetch_list(
     client: &Arc<Client>,
     server_pubkey: &PublicKey,
@@ -285,9 +361,90 @@ mod tests {
             )
             .unwrap(),
             created_at: Timestamp::now(),
+            protocol_version: None,
+            capabilities: None,
+            instructions: None,
         };
 
         assert_eq!(announcement.pubkey, pubkey.to_hex());
         assert_eq!(announcement.server_info.name, Some("Test".to_string()));
     }
+
+    #[test]
+    fn test_parse_announcement_content_legacy_format() {
+        let content = r#"{"name":"Legacy Server","version":"0.1.0","about":"Old format"}"#;
+        let (info, pv, caps, instr) = super::parse_announcement_content(content);
+        assert_eq!(info.name.as_deref(), Some("Legacy Server"));
+        assert_eq!(info.version.as_deref(), Some("0.1.0"));
+        assert_eq!(info.about.as_deref(), Some("Old format"));
+        assert!(pv.is_none());
+        assert!(caps.is_none());
+        assert!(instr.is_none());
+    }
+
+    #[test]
+    fn test_parse_announcement_content_initialize_result_format() {
+        let content = r#"{
+            "protocolVersion": "2025-03-26",
+            "capabilities": {
+                "tools": { "listChanged": true },
+                "resources": { "subscribe": false, "listChanged": false }
+            },
+            "serverInfo": {
+                "name": "NewServer",
+                "version": "2.0.0",
+                "description": "Full InitializeResult",
+                "websiteUrl": "https://example.com"
+            },
+            "instructions": "Use tool X for Y"
+        }"#;
+        let (info, pv, caps, instr) = super::parse_announcement_content(content);
+
+        assert_eq!(info.name.as_deref(), Some("NewServer"));
+        assert_eq!(info.version.as_deref(), Some("2.0.0"));
+        assert_eq!(info.about.as_deref(), Some("Full InitializeResult"));
+        assert_eq!(info.website.as_deref(), Some("https://example.com"));
+        assert!(info.picture.is_none());
+
+        assert_eq!(pv.as_deref(), Some("2025-03-26"));
+        assert!(caps.is_some());
+        let caps = caps.unwrap();
+        assert!(caps.get("tools").is_some());
+        assert_eq!(instr.as_deref(), Some("Use tool X for Y"));
+    }
+
+    #[test]
+    fn test_parse_announcement_content_invalid_json() {
+        let (info, pv, caps, instr) = super::parse_announcement_content("not json");
+        assert!(info.name.is_none());
+        assert!(pv.is_none());
+        assert!(caps.is_none());
+        assert!(instr.is_none());
+    }
+
+    #[test]
+    fn test_parse_announcement_content_empty_object() {
+        let (info, pv, caps, instr) = super::parse_announcement_content("{}");
+        assert!(info.name.is_none());
+        assert!(pv.is_none());
+        assert!(caps.is_none());
+        assert!(instr.is_none());
+    }
+
+    #[test]
+    fn test_server_info_from_implementation() {
+        let val = serde_json::json!({
+            "name": "TestImpl",
+            "version": "3.0",
+            "title": "Fancy Title",
+            "description": "Impl description",
+            "websiteUrl": "https://impl.example.com"
+        });
+        let info = super::server_info_from_implementation(&val);
+        assert_eq!(info.name.as_deref(), Some("TestImpl"));
+        assert_eq!(info.version.as_deref(), Some("3.0"));
+        assert_eq!(info.website.as_deref(), Some("https://impl.example.com"));
+        assert_eq!(info.about.as_deref(), Some("Impl description"));
+        assert!(info.picture.is_none());
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 493a901..d8aab47 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -62,7 +62,7 @@ pub use core::error::{Error, Result};
 pub use core::types::{
     CapabilityExclusion, ClientSession, EncryptionMode, GiftWrapMode, JsonRpcError,
     JsonRpcErrorResponse, JsonRpcMessage, JsonRpcNotification, JsonRpcRequest, JsonRpcResponse,
-    ServerInfo,
+    ProfileMetadata, ServerInfo,
 };
 
 // ── Discovery ────────────────────────────────────────────────────────