test ai chat

2026-01-20 13:46:28 +09:00
parent 6f5290753d
commit 1d3aa51fb6
27 changed files with 1463 additions and 45 deletions
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,12 @@
 # LMS Translation API
 TRANSLATE_URL=http://127.0.0.1:1234/v1
 TRANSLATE_MODEL=plamo-2-translate
+
+# Chat API
+CHAT_URL=http://127.0.0.1:1234/v1
+CHAT_MODEL=gpt-oss-20b
+# CHAT_MAX_TOKENS=2048
+
+# Character/system prompt (choose one)
+# CHAT_SYSTEM="You are ai, a friendly AI assistant."
+# CHAT_SYSTEM_FILE=./character.txt
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,3 +22,4 @@ dirs = "5.0"
 chrono = { version = "0.4", features = ["serde"] }
 rand = "0.8"
 dotenvy = "0.15"
+rustyline = "15"
--- a/lexicons/ai.syui.log.chat.json
+++ b/lexicons/ai.syui.log.chat.json
@@ -0,0 +1,43 @@
+{
+  "lexicon": 1,
+  "id": "ai.syui.log.chat",
+  "defs": {
+    "main": {
+      "type": "record",
+      "description": "Record containing a chat message in a conversation.",
+      "key": "tid",
+      "record": {
+        "type": "object",
+        "required": ["content", "author", "createdAt"],
+        "properties": {
+          "content": {
+            "type": "string",
+            "maxLength": 100000,
+            "maxGraphemes": 10000,
+            "description": "The content of the message."
+          },
+          "author": {
+            "type": "string",
+            "format": "did",
+            "description": "DID of the message author."
+          },
+          "root": {
+            "type": "string",
+            "format": "at-uri",
+            "description": "AT-URI of the root message in the thread."
+          },
+          "parent": {
+            "type": "string",
+            "format": "at-uri",
+            "description": "AT-URI of the parent message being replied to."
+          },
+          "createdAt": {
+            "type": "string",
+            "format": "datetime",
+            "description": "Client-declared timestamp when this message was created."
+          }
+        }
+      }
+    }
+  }
+}
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/4bo4rykkpc3qn.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/4bo4rykkpc3qn.json
@@ -0,0 +1,12 @@
+{
+  "cid": "bafyreietuazvdueb6qurinctdb5v7amgdtiwvsblrom57i3nsbncruqube",
+  "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/4bo4rykkpc3qn",
+  "value": {
+    "$type": "ai.syui.log.chat",
+    "author": "did:plc:6qyecktefllvenje24fcxnie",
+    "content": "Hi there! What can I do for you today?",
+    "createdAt": "2026-01-20T06:20:56.978Z",
+    "parent": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/ix2zlpss4qvk7",
+    "root": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/z7ogy7bcpevio"
+  }
+}
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/7litah653dqcu.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/7litah653dqcu.json
@@ -0,0 +1,12 @@
+{
+  "cid": "bafyreic5zy6owo72usubnrlbvjcu2dg3jkm227zshtrewaefi6553bkpvu",
+  "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/7litah653dqcu",
+  "value": {
+    "$type": "ai.syui.log.chat",
+    "author": "did:plc:6qyecktefllvenje24fcxnie",
+    "content": "Got it—ready to help!",
+    "createdAt": "2026-01-20T06:19:29.502Z",
+    "parent": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/t7m6vkdvxfuwe",
+    "root": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/z7ogy7bcpevio"
+  }
+}
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/index.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/index.json
@@ -0,0 +1,6 @@
+[
+  "y7ez6hslykhns",
+  "qcvhb3lxqbxdm",
+  "7litah653dqcu",
+  "4bo4rykkpc3qn"
+]
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/qcvhb3lxqbxdm.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/qcvhb3lxqbxdm.json
@@ -0,0 +1,12 @@
+{
+  "cid": "bafyreiafjmwzhkzsv5j7nvss2fyall5dhj7ajw4w3ghn2wl5n6wgwrsv3u",
+  "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/qcvhb3lxqbxdm",
+  "value": {
+    "$type": "ai.syui.log.chat",
+    "author": "did:plc:6qyecktefllvenje24fcxnie",
+    "content": "Understood.",
+    "createdAt": "2026-01-20T06:19:32.551Z",
+    "parent": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/ac4xitw5i4nhq",
+    "root": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/z7ogy7bcpevio"
+  }
+}
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/y7ez6hslykhns.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/y7ez6hslykhns.json
@@ -0,0 +1,12 @@
+{
+  "cid": "bafyreigignkrmdjd6zll4jatfd5543ae52ipnxqo5a5bwd5iqxds3dk6za",
+  "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/y7ez6hslykhns",
+  "value": {
+    "$type": "ai.syui.log.chat",
+    "author": "did:plc:6qyecktefllvenje24fcxnie",
+    "content": "Sure—what would you like to create or start?",
+    "createdAt": "2026-01-20T06:21:50.148Z",
+    "parent": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/gtm2kwf7472wk",
+    "root": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/gtm2kwf7472wk"
+  }
+}
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/app.bsky.actor.profile/self.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/app.bsky.actor.profile/self.json
@@ -0,0 +1,17 @@
+{
+  "cid": "bafyreigknaeiqn7txi3of25k7o3jnxdcft4pmcqi2sbfkkfefriqm6tyoe",
+  "uri": "at://did:plc:6qyecktefllvenje24fcxnie/app.bsky.actor.profile/self",
+  "value": {
+    "$type": "app.bsky.actor.profile",
+    "avatar": {
+      "$type": "blob",
+      "mimeType": "image/jpeg",
+      "ref": {
+        "$link": "bafkreigo3ucp32carhbn3chfc3hlf6i7f4rplojc76iylihzpifyexi24y"
+      },
+      "size": 375259
+    },
+    "description": "https://syu.is/syui",
+    "displayName": "ai"
+  }
+}
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/blob/bafkreigo3ucp32carhbn3chfc3hlf6i7f4rplojc76iylihzpifyexi24y
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/blob/bafkreigo3ucp32carhbn3chfc3hlf6i7f4rplojc76iylihzpifyexi24y
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/describe.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/describe.json
@@ -0,0 +1,16 @@
+{
+  "collections": [
+    "ai.syui.card.admin",
+    "ai.syui.card.user",
+    "ai.syui.log.chat",
+    "ai.syui.rse.admin",
+    "ai.syui.rse.user",
+    "app.bsky.actor.profile",
+    "app.bsky.feed.generator",
+    "app.bsky.feed.post",
+    "app.bsky.graph.follow",
+    "app.bsky.graph.verification"
+  ],
+  "did": "did:plc:6qyecktefllvenje24fcxnie",
+  "handle": "ai.syui.ai"
+}
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.post/3mchqlshygs2s.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.post/3mchqlshygs2s.json
@@ -1,5 +1,5 @@
 {
-  "cid": "bafyreigwaeqfluw7btvnmxfogd77gtk4efwomvjsvq2yxmmxr2665zwwbi",
+  "cid": "bafyreicsjh5jf2yqmm4rfi2oha6zcafw57s3kz7w4iqw4eoh7vf6bwfoyu",
  "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.post/3mchqlshygs2s",
  "value": {
    "$type": "ai.syui.log.post",
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/describe.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/describe.json
@@ -1,5 +1,6 @@
 {
  "collections": [
+    "ai.syui.log.chat",
    "ai.syui.log.post",
    "app.bsky.actor.profile",
    "app.bsky.feed.post",
--- a/readme.md
+++ b/readme.md
@@ -247,3 +247,101 @@ The current implementation uses the DNS-based approach instead, which works toda
 ### Reference

 - [resolve-lexicon](https://resolve-lexicon.pages.dev/) - Browser-compatible lexicon resolver
+
+## chat
+
+Chat with AI bot and save conversations to ATProto.
+
+### Setup
+
+1. Login as user and bot:
+
+```sh
+# User login
+$ ailog login user.syu.is -p <password> -s syu.is
+
+# Bot login
+$ ailog login ai.syu.is -p <password> -s syu.is --bot
+```
+
+2. Configure LLM endpoint in `.env`:
+
+```
+CHAT_URL=http://127.0.0.1:1234/v1
+CHAT_MODEL=gemma-2-9b
+```
+
+3. (Optional) Set character/system prompt:
+
+```sh
+# Direct prompt
+CHAT_SYSTEM="You are ai, a friendly AI assistant."
+
+# Or load from file
+CHAT_SYSTEM_FILE=./character.txt
+```
+
+### Usage
+
+```sh
+# Start a new conversation
+$ ailog chat --new "hello"
+
+# Continue the conversation
+$ ailog chat "how are you?"
+
+# Interactive mode (new session)
+$ ailog chat --new
+
+# Interactive mode (continue)
+$ ailog chat
+```
+
+### Data Storage
+
+Messages are saved locally to `public/content/{did}/ai.syui.log.chat/`:
+
+```
+public/content/
+├── did:plc:xxx/              # User's messages
+│   └── ai.syui.log.chat/
+│       ├── index.json
+│       └── {rkey}.json
+└── did:plc:yyy/              # Bot's messages
+    └── ai.syui.log.chat/
+        ├── index.json
+        └── {rkey}.json
+```
+
+### Sync & Push
+
+```sh
+# Sync bot data from PDS to local
+$ ailog sync --bot
+
+# Push local chat to PDS
+$ ailog push -c ai.syui.log.chat --bot
+```
+
+### Web Display
+
+View chat threads at `/@{handle}/at/chat`:
+
+- `/@user.syu.is/at/chat` - Thread list (conversations started by user)
+- `/@user.syu.is/at/chat/{rkey}` - Full conversation thread
+
+### Record Schema
+
+```json
+{
+  "$type": "ai.syui.log.chat",
+  "content": "message text",
+  "author": "did:plc:xxx",
+  "createdAt": "2025-01-01T00:00:00.000Z",
+  "root": "at://did:plc:xxx/ai.syui.log.chat/{rkey}",
+  "parent": "at://did:plc:yyy/ai.syui.log.chat/{rkey}"
+}
+```
+
+- `root`: First message URI in the thread (empty for conversation start)
+- `parent`: Previous message URI in the thread
--- a/src/commands/auth.rs
+++ b/src/commands/auth.rs
@@ -20,7 +20,7 @@ struct CreateSessionResponse {
 }

 /// Login to ATProto PDS
-pub async fn login(handle: &str, password: &str, pds: &str) -> Result<()> {
+pub async fn login(handle: &str, password: &str, pds: &str, is_bot: bool) -> Result<()> {
    let client = reqwest::Client::new();
    let url = lexicons::url(pds, &com_atproto_server::CREATE_SESSION);

@@ -29,7 +29,8 @@ pub async fn login(handle: &str, password: &str, pds: &str) -> Result<()> {
        password: password.to_string(),
    };

-    println!("Logging in to {} as {}...", pds, handle);
+    let account_type = if is_bot { "bot" } else { "user" };
+    println!("Logging in to {} as {} ({})...", pds, handle, account_type);

    let res = client
        .post(&url)
@@ -54,7 +55,11 @@ pub async fn login(handle: &str, password: &str, pds: &str) -> Result<()> {
        pds: Some(pds.to_string()),
    };

+    if is_bot {
+        token::save_bot_session(&session)?;
+    } else {
        token::save_session(&session)?;
+    }
    println!("Logged in as {} ({})", session.handle, session.did);

    Ok(())
@@ -95,3 +100,39 @@ pub async fn refresh_session() -> Result<Session> {

    Ok(session)
 }
+
+/// Refresh bot access token
+pub async fn refresh_bot_session() -> Result<Session> {
+    let session = token::load_bot_session()?;
+    let pds = session.pds.as_deref().unwrap_or("bsky.social");
+
+    let client = reqwest::Client::new();
+    let url = lexicons::url(pds, &com_atproto_server::REFRESH_SESSION);
+
+    let res = client
+        .post(&url)
+        .header("Authorization", format!("Bearer {}", session.refresh_jwt))
+        .send()
+        .await
+        .context("Failed to refresh bot session")?;
+
+    if !res.status().is_success() {
+        let status = res.status();
+        let body = res.text().await.unwrap_or_default();
+        anyhow::bail!("Bot refresh failed: {} - {}. Try 'ailog login --bot' again.", status, body);
+    }
+
+    let new_session: CreateSessionResponse = res.json().await?;
+
+    let session = Session {
+        did: new_session.did,
+        handle: new_session.handle,
+        access_jwt: new_session.access_jwt,
+        refresh_jwt: new_session.refresh_jwt,
+        pds: Some(pds.to_string()),
+    };
+
+    token::save_bot_session(&session)?;
+
+    Ok(session)
+}
--- a/src/commands/post.rs
+++ b/src/commands/post.rs
@@ -4,7 +4,7 @@ use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use std::fs;

-use super::auth;
+use super::{auth, token};
 use crate::lexicons::{self, com_atproto_repo, com_atproto_identity};

 #[derive(Debug, Serialize)]
@@ -234,15 +234,24 @@ struct DescribeRepoResponse {
 }

 /// Sync PDS data to local content directory
-pub async fn sync_to_local(output: &str) -> Result<()> {
+pub async fn sync_to_local(output: &str, is_bot: bool, collection_override: Option<&str>) -> Result<()> {
+    let client = reqwest::Client::new();
+
+    let (did, pds, _handle, collection) = if is_bot {
+        // Bot mode: use bot.json
+        let session = token::load_bot_session()?;
+        let pds = session.pds.as_deref().unwrap_or("bsky.social");
+        let collection = collection_override.unwrap_or("ai.syui.log.chat");
+        println!("Syncing bot data for {} ({})", session.handle, session.did);
+        (session.did.clone(), format!("https://{}", pds), session.handle.clone(), collection.to_string())
+    } else {
+        // User mode: use config.json
        let config_content = fs::read_to_string("public/config.json")
            .context("config.json not found")?;
        let config: Config = serde_json::from_str(&config_content)?;

        println!("Syncing data for {}", config.handle);

-    let client = reqwest::Client::new();
-
        // Resolve handle to DID
        let resolve_url = format!(
            "{}?handle={}",
@@ -251,9 +260,7 @@ pub async fn sync_to_local(output: &str) -> Result<()> {
        );
        let res = client.get(&resolve_url).send().await?;
        let resolve: serde_json::Value = res.json().await?;
-    let did = resolve["did"].as_str().context("Could not resolve handle")?;
-
-    println!("DID: {}", did);
+        let did = resolve["did"].as_str().context("Could not resolve handle")?.to_string();

        // Get PDS from DID document
        let plc_url = format!("https://plc.directory/{}", did);
@@ -265,8 +272,17 @@ pub async fn sync_to_local(output: &str) -> Result<()> {
                services.iter().find(|s| s["type"] == "AtprotoPersonalDataServer")
            })
            .and_then(|s| s["serviceEndpoint"].as_str())
-        .context("Could not find PDS")?;
+            .context("Could not find PDS")?
+            .to_string();

+        let collection = collection_override
+            .map(|s| s.to_string())
+            .unwrap_or_else(|| config.collection.as_deref().unwrap_or("ai.syui.log.post").to_string());
+
+        (did, pds, config.handle.clone(), collection)
+    };
+
+    println!("DID: {}", did);
    println!("PDS: {}", pds);

    // Remove https:// prefix for lexicons::url
@@ -332,7 +348,6 @@ pub async fn sync_to_local(output: &str) -> Result<()> {
    }

    // 3. Sync collection records
-    let collection = config.collection.as_deref().unwrap_or("ai.syui.log.post");
    let records_url = format!(
        "{}?repo={}&collection={}&limit=100",
        lexicons::url(pds_host, &com_atproto_repo::LIST_RECORDS),
@@ -370,3 +385,82 @@ pub async fn sync_to_local(output: &str) -> Result<()> {

    Ok(())
 }
+
+/// Push local content to PDS
+pub async fn push_to_remote(input: &str, collection: &str, is_bot: bool) -> Result<()> {
+    let session = if is_bot {
+        auth::refresh_bot_session().await?
+    } else {
+        auth::refresh_session().await?
+    };
+    let pds = session.pds.as_deref().unwrap_or("bsky.social");
+    let did = &session.did;
+
+    // Build collection directory path
+    let collection_dir = format!("{}/{}/{}", input, did, collection);
+
+    if !std::path::Path::new(&collection_dir).exists() {
+        anyhow::bail!("Collection directory not found: {}", collection_dir);
+    }
+
+    println!("Pushing records from {} to {}", collection_dir, collection);
+
+    let client = reqwest::Client::new();
+    let url = lexicons::url(pds, &com_atproto_repo::PUT_RECORD);
+
+    let mut count = 0;
+    for entry in fs::read_dir(&collection_dir)? {
+        let entry = entry?;
+        let path = entry.path();
+
+        // Skip non-JSON files and index.json
+        if path.extension().map(|e| e != "json").unwrap_or(true) {
+            continue;
+        }
+        let filename = path.file_stem().and_then(|s| s.to_str()).unwrap_or("");
+        if filename == "index" {
+            continue;
+        }
+
+        let rkey = filename.to_string();
+        let content = fs::read_to_string(&path)?;
+        let record_data: Value = serde_json::from_str(&content)?;
+
+        // Extract value from record (sync saves as {uri, cid, value})
+        let record = if record_data.get("value").is_some() {
+            record_data["value"].clone()
+        } else {
+            record_data
+        };
+
+        let req = PutRecordRequest {
+            repo: did.clone(),
+            collection: collection.to_string(),
+            rkey: rkey.clone(),
+            record,
+        };
+
+        println!("Pushing: {}", rkey);
+
+        let res = client
+            .post(&url)
+            .header("Authorization", format!("Bearer {}", session.access_jwt))
+            .json(&req)
+            .send()
+            .await?;
+
+        if !res.status().is_success() {
+            let status = res.status();
+            let body = res.text().await.unwrap_or_default();
+            println!("  Failed: {} - {}", status, body);
+        } else {
+            let result: PutRecordResponse = res.json().await?;
+            println!("  OK: {}", result.uri);
+            count += 1;
+        }
+    }
+
+    println!("Pushed {} records to {}", count, collection);
+
+    Ok(())
+}
--- a/src/commands/token.rs
+++ b/src/commands/token.rs
@@ -27,6 +27,16 @@ pub fn token_path() -> Result<PathBuf> {
    Ok(config_dir.join("token.json"))
 }

+/// Get bot token file path: ~/Library/Application Support/ai.syui.log/bot.json
+pub fn bot_token_path() -> Result<PathBuf> {
+    let config_dir = dirs::config_dir()
+        .context("Could not find config directory")?
+        .join(BUNDLE_ID);
+
+    fs::create_dir_all(&config_dir)?;
+    Ok(config_dir.join("bot.json"))
+}
+
 /// Load session from token file
 pub fn load_session() -> Result<Session> {
    let path = token_path()?;
@@ -44,3 +54,21 @@ pub fn save_session(session: &Session) -> Result<()> {
    println!("Token saved to {:?}", path);
    Ok(())
 }
+
+/// Load bot session from bot token file
+pub fn load_bot_session() -> Result<Session> {
+    let path = bot_token_path()?;
+    let content = fs::read_to_string(&path)
+        .with_context(|| format!("Bot token file not found: {:?}. Run 'ailog login --bot' first.", path))?;
+    let session: Session = serde_json::from_str(&content)?;
+    Ok(session)
+}
+
+/// Save bot session to bot token file
+pub fn save_bot_session(session: &Session) -> Result<()> {
+    let path = bot_token_path()?;
+    let content = serde_json::to_string_pretty(session)?;
+    fs::write(&path, content)?;
+    println!("Bot token saved to {:?}", path);
+    Ok(())
+}
--- a/src/lms/chat.rs
+++ b/src/lms/chat.rs
@@ -0,0 +1,395 @@
+use anyhow::{anyhow, Result};
+use rustyline::error::ReadlineError;
+use rustyline::DefaultEditor;
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use std::env;
+use std::fs;
+use std::path::Path;
+
+use crate::commands::token::{self, BUNDLE_ID};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+struct ChatMessage {
+    role: String,
+    content: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ChatRequest {
+    model: String,
+    messages: Vec<ChatMessage>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    max_tokens: Option<u32>,
+}
+
+#[derive(Debug, Deserialize)]
+struct ChatChoice {
+    message: ChatMessageResponse,
+}
+
+#[derive(Debug, Deserialize)]
+struct ChatMessageResponse {
+    content: String,
+}
+
+#[derive(Debug, Deserialize)]
+struct ChatResponse {
+    choices: Vec<ChatChoice>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct ChatRecord {
+    uri: String,
+    cid: String,
+    value: Value,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+struct ChatSession {
+    root_uri: Option<String>,
+    last_uri: Option<String>,
+    messages: Vec<ChatMessage>,
+}
+
+impl Default for ChatSession {
+    fn default() -> Self {
+        Self {
+            root_uri: None,
+            last_uri: None,
+            messages: Vec::new(),
+        }
+    }
+}
+
+/// Get system prompt from environment or file
+fn get_system_prompt() -> String {
+    // 1. Try CHAT_SYSTEM env var directly
+    if let Ok(prompt) = env::var("CHAT_SYSTEM") {
+        return prompt;
+    }
+
+    // 2. Try CHAT_SYSTEM_FILE env var (path to file)
+    if let Ok(file_path) = env::var("CHAT_SYSTEM_FILE") {
+        if let Ok(content) = fs::read_to_string(&file_path) {
+            return content.trim().to_string();
+        }
+    }
+
+    // 3. Default prompt
+    "You are a helpful assistant. Respond concisely.".to_string()
+}
+
+/// Create new chat session with system prompt
+fn new_session_with_prompt() -> ChatSession {
+    ChatSession {
+        root_uri: None,
+        last_uri: None,
+        messages: vec![ChatMessage {
+            role: "system".to_string(),
+            content: get_system_prompt(),
+        }],
+    }
+}
+
+/// Get session file path
+fn session_path() -> Result<std::path::PathBuf> {
+    let config_dir = dirs::config_dir()
+        .ok_or_else(|| anyhow!("Could not find config directory"))?
+        .join(BUNDLE_ID);
+    fs::create_dir_all(&config_dir)?;
+    Ok(config_dir.join("chat_session.json"))
+}
+
+/// Load chat session (updates system prompt from current env)
+fn load_session() -> Result<ChatSession> {
+    let path = session_path()?;
+    if path.exists() {
+        let content = fs::read_to_string(&path)?;
+        let mut session: ChatSession = serde_json::from_str(&content)?;
+
+        // Update system prompt from current environment
+        let system_prompt = get_system_prompt();
+        if let Some(first) = session.messages.first_mut() {
+            if first.role == "system" {
+                first.content = system_prompt;
+            }
+        } else {
+            session.messages.insert(0, ChatMessage {
+                role: "system".to_string(),
+                content: system_prompt,
+            });
+        }
+
+        Ok(session)
+    } else {
+        Ok(ChatSession::default())
+    }
+}
+
+/// Save chat session
+fn save_session(session: &ChatSession) -> Result<()> {
+    let path = session_path()?;
+    let content = serde_json::to_string_pretty(session)?;
+    fs::write(&path, content)?;
+    Ok(())
+}
+
+/// Generate TID
+fn generate_tid() -> String {
+    use rand::Rng;
+    const CHARSET: &[u8] = b"234567abcdefghijklmnopqrstuvwxyz";
+    let mut rng = rand::thread_rng();
+    (0..13)
+        .map(|_| {
+            let idx = rng.gen_range(0..CHARSET.len());
+            CHARSET[idx] as char
+        })
+        .collect()
+}
+
+/// Call LLM API
+async fn call_llm(client: &reqwest::Client, url: &str, model: &str, messages: &[ChatMessage]) -> Result<String> {
+    let max_tokens = env::var("CHAT_MAX_TOKENS")
+        .ok()
+        .and_then(|v| v.parse().ok());
+
+    let req = ChatRequest {
+        model: model.to_string(),
+        messages: messages.to_vec(),
+        max_tokens,
+    };
+
+    let res = client.post(url).json(&req).send().await?;
+
+    if !res.status().is_success() {
+        let status = res.status();
+        let body = res.text().await?;
+        return Err(anyhow!("LLM call failed ({}): {}", status, body));
+    }
+
+    let chat_res: ChatResponse = res.json().await?;
+    chat_res
+        .choices
+        .first()
+        .map(|c| c.message.content.trim().to_string())
+        .ok_or_else(|| anyhow!("No response from LLM"))
+}
+
+/// Save chat record to local file
+fn save_chat_local(
+    output_dir: &str,
+    did: &str,
+    content: &str,
+    author_did: &str,
+    root_uri: Option<&str>,
+    parent_uri: Option<&str>,
+) -> Result<String> {
+    let rkey = generate_tid();
+    let now = chrono::Utc::now().format("%Y-%m-%dT%H:%M:%S%.3fZ").to_string();
+    let uri = format!("at://{}/ai.syui.log.chat/{}", did, rkey);
+
+    let mut value = serde_json::json!({
+        "$type": "ai.syui.log.chat",
+        "content": content,
+        "author": author_did,
+        "createdAt": now,
+    });
+
+    if let Some(root) = root_uri {
+        value["root"] = serde_json::json!(root);
+    }
+    if let Some(parent) = parent_uri {
+        value["parent"] = serde_json::json!(parent);
+    }
+
+    let record = ChatRecord {
+        uri: uri.clone(),
+        cid: format!("bafyrei{}", rkey),
+        value,
+    };
+
+    // Create directory: {output_dir}/{did}/ai.syui.log.chat/
+    let collection_dir = Path::new(output_dir)
+        .join(did)
+        .join("ai.syui.log.chat");
+    fs::create_dir_all(&collection_dir)?;
+
+    // Save record: {rkey}.json
+    let file_path = collection_dir.join(format!("{}.json", rkey));
+    let json_content = serde_json::to_string_pretty(&record)?;
+    fs::write(&file_path, json_content)?;
+
+    // Update index.json
+    let index_path = collection_dir.join("index.json");
+    let mut rkeys: Vec<String> = if index_path.exists() {
+        let index_content = fs::read_to_string(&index_path).unwrap_or_else(|_| "[]".to_string());
+        serde_json::from_str(&index_content).unwrap_or_else(|_| Vec::new())
+    } else {
+        Vec::new()
+    };
+    if !rkeys.contains(&rkey.to_string()) {
+        rkeys.push(rkey.to_string());
+        fs::write(&index_path, serde_json::to_string_pretty(&rkeys)?)?;
+    }
+
+    Ok(uri)
+}
+
+/// Process a single message and get response
+async fn process_message(
+    client: &reqwest::Client,
+    llm_url: &str,
+    model: &str,
+    output_dir: &str,
+    user_did: &str,
+    bot_did: &str,
+    session: &mut ChatSession,
+    input: &str,
+) -> Result<String> {
+    // Add user message to history
+    session.messages.push(ChatMessage {
+        role: "user".to_string(),
+        content: input.to_string(),
+    });
+
+    // Save user message to local file
+    let user_uri = save_chat_local(
+        output_dir,
+        user_did,
+        input,
+        user_did,
+        session.root_uri.as_deref(),
+        session.last_uri.as_deref(),
+    )?;
+
+    // Set root if first message
+    if session.root_uri.is_none() {
+        session.root_uri = Some(user_uri.clone());
+    }
+
+    // Call LLM with full history
+    let response = call_llm(client, llm_url, model, &session.messages).await?;
+
+    // Add assistant message to history
+    session.messages.push(ChatMessage {
+        role: "assistant".to_string(),
+        content: response.clone(),
+    });
+
+    // Save AI response to local file
+    let ai_uri = save_chat_local(
+        output_dir,
+        bot_did,
+        &response,
+        bot_did,
+        session.root_uri.as_deref(),
+        Some(&user_uri),
+    )?;
+
+    session.last_uri = Some(ai_uri);
+
+    // Save session
+    save_session(session)?;
+
+    Ok(response)
+}
+
+/// Run chat - interactive or single message
+pub async fn run(input: Option<&str>, new_session: bool) -> Result<()> {
+    let chat_url = env::var("CHAT_URL")
+        .or_else(|_| env::var("TRANSLATE_URL"))
+        .unwrap_or_else(|_| "http://127.0.0.1:1234/v1".to_string());
+    let model = env::var("CHAT_MODEL")
+        .or_else(|_| env::var("TRANSLATE_MODEL"))
+        .unwrap_or_else(|_| "gpt-oss".to_string());
+    let output_dir = env::var("CHAT_OUTPUT").unwrap_or_else(|_| {
+        // Use absolute path from current working directory
+        let cwd = env::current_dir().unwrap_or_default();
+        cwd.join("public/content").to_string_lossy().to_string()
+    });
+
+    // Load user session for DID
+    let user_token = token::load_session()?;
+    let user_did = user_token.did.clone();
+
+    // Load bot session for DID (required)
+    let bot_did = match token::load_bot_session() {
+        Ok(s) => s.did,
+        Err(_) => {
+            eprintln!("Bot session not found. Please login as bot first:");
+            eprintln!("  ailog login <handle> -p <password> -s <server> --bot");
+            return Ok(());
+        }
+    };
+
+    // Load or create chat session
+    let mut session = if new_session {
+        new_session_with_prompt()
+    } else {
+        load_session().unwrap_or_else(|_| new_session_with_prompt())
+    };
+
+    let client = reqwest::Client::new();
+    let llm_url = format!("{}/chat/completions", chat_url);
+
+    // Single message mode
+    if let Some(msg) = input {
+        let response = process_message(
+            &client, &llm_url, &model, &output_dir,
+            &user_did, &bot_did, &mut session, msg,
+        ).await?;
+        println!("{}", response);
+        use std::io::Write;
+        std::io::stdout().flush()?;
+        return Ok(());
+    }
+
+    // Interactive mode
+    println!("ailog chat (type 'exit' to quit, Ctrl+C to cancel)");
+    println!("model: {}", model);
+    println!("---");
+
+    let mut rl = DefaultEditor::new()?;
+
+    loop {
+        match rl.readline("> ") {
+            Ok(line) => {
+                let input = line.trim();
+                if input.is_empty() {
+                    continue;
+                }
+                if input == "exit" || input == "quit" {
+                    break;
+                }
+
+                let _ = rl.add_history_entry(input);
+
+                match process_message(
+                    &client, &llm_url, &model, &output_dir,
+                    &user_did, &bot_did, &mut session, input,
+                ).await {
+                    Ok(response) => println!("\n{}\n", response),
+                    Err(e) => {
+                        eprintln!("Error: {}", e);
+                        // Remove failed message from history
+                        session.messages.pop();
+                    }
+                }
+            }
+            Err(ReadlineError::Interrupted) => {
+                println!("^C");
+                continue;
+            }
+            Err(ReadlineError::Eof) => {
+                break;
+            }
+            Err(e) => {
+                eprintln!("Error: {}", e);
+                break;
+            }
+        }
+    }
+
+    Ok(())
+}
--- a/src/lms/mod.rs
+++ b/src/lms/mod.rs
@@ -1 +1,2 @@
+pub mod chat;
 pub mod translate;
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,6 +26,9 @@ enum Commands {
        /// PDS server
        #[arg(short, long, default_value = "bsky.social")]
        server: String,
+        /// Login as bot (saves to bot.json)
+        #[arg(long)]
+        bot: bool,
    },

    /// Update lexicon schema
@@ -75,6 +78,25 @@ enum Commands {
        /// Output directory
        #[arg(short, long, default_value = "public/content")]
        output: String,
+        /// Sync bot data (uses bot.json)
+        #[arg(long)]
+        bot: bool,
+        /// Collection to sync (for bot)
+        #[arg(short, long)]
+        collection: Option<String>,
+    },
+
+    /// Push local content to PDS
+    Push {
+        /// Input directory
+        #[arg(short, long, default_value = "public/content")]
+        input: String,
+        /// Collection (e.g., ai.syui.log.post)
+        #[arg(short, long, default_value = "ai.syui.log.post")]
+        collection: String,
+        /// Push as bot (uses bot.json)
+        #[arg(long)]
+        bot: bool,
    },

    /// Generate lexicon Rust code from ATProto lexicon JSON files
@@ -107,6 +129,16 @@ enum Commands {
        #[arg(short, long, default_value = "bsky.social")]
        server: String,
    },
+
+    /// Chat with AI
+    #[command(alias = "c")]
+    Chat {
+        /// Message to send (optional, starts interactive mode if omitted)
+        message: Option<String>,
+        /// Start new conversation
+        #[arg(long)]
+        new: bool,
+    },
 }

 #[tokio::main]
@@ -117,8 +149,8 @@ async fn main() -> Result<()> {
    let cli = Cli::parse();

    match cli.command {
-        Commands::Login { handle, password, server } => {
-            commands::auth::login(&handle, &password, &server).await?;
+        Commands::Login { handle, password, server, bot } => {
+            commands::auth::login(&handle, &password, &server, bot).await?;
        }
        Commands::Lexicon { file } => {
            commands::post::put_lexicon(&file).await?;
@@ -132,8 +164,11 @@ async fn main() -> Result<()> {
        Commands::Delete { collection, rkey } => {
            commands::post::delete_record(&collection, &rkey).await?;
        }
-        Commands::Sync { output } => {
-            commands::post::sync_to_local(&output).await?;
+        Commands::Sync { output, bot, collection } => {
+            commands::post::sync_to_local(&output, bot, collection.as_deref()).await?;
+        }
+        Commands::Push { input, collection, bot } => {
+            commands::post::push_to_remote(&input, &collection, bot).await?;
        }
        Commands::Gen { input, output } => {
            commands::gen::generate(&input, &output)?;
@@ -144,6 +179,9 @@ async fn main() -> Result<()> {
        Commands::Did { handle, server } => {
            commands::did::resolve(&handle, &server).await?;
        }
+        Commands::Chat { message, new } => {
+            lms::chat::run(message.as_deref(), new).await?;
+        }
    }

    Ok(())
--- a/src/web/components/chat.ts
+++ b/src/web/components/chat.ts
@@ -0,0 +1,260 @@
+import type { ChatMessage, Profile } from '../types'
+import { renderMarkdown } from '../lib/markdown'
+
+// Escape HTML to prevent XSS
+function escapeHtml(text: string): string {
+  const div = document.createElement('div')
+  div.textContent = text
+  return div.innerHTML
+}
+
+// Format date/time for chat
+function formatChatTime(dateStr: string): string {
+  const d = new Date(dateStr)
+  const month = String(d.getMonth() + 1).padStart(2, '0')
+  const day = String(d.getDate()).padStart(2, '0')
+  const hour = String(d.getHours()).padStart(2, '0')
+  const min = String(d.getMinutes()).padStart(2, '0')
+  return `${month}/${day} ${hour}:${min}`
+}
+
+// Extract rkey from AT URI
+function getRkeyFromUri(uri: string): string {
+  return uri.split('/').pop() || ''
+}
+
+// Profile info for authors
+interface AuthorInfo {
+  did: string
+  handle: string
+  avatarUrl?: string
+}
+
+// Build author info map
+function buildAuthorMap(
+  userDid: string,
+  userHandle: string,
+  botDid: string,
+  botHandle: string,
+  userProfile?: Profile | null,
+  botProfile?: Profile | null,
+  pds?: string
+): Map<string, AuthorInfo> {
+  const authors = new Map<string, AuthorInfo>()
+
+  // User info
+  let userAvatarUrl = ''
+  if (userProfile?.value.avatar) {
+    const cid = userProfile.value.avatar.ref.$link
+    userAvatarUrl = pds ? `${pds}/xrpc/com.atproto.sync.getBlob?did=${userDid}&cid=${cid}` : `/content/${userDid}/blob/${cid}`
+  }
+  authors.set(userDid, { did: userDid, handle: userHandle, avatarUrl: userAvatarUrl })
+
+  // Bot info
+  let botAvatarUrl = ''
+  if (botProfile?.value.avatar) {
+    const cid = botProfile.value.avatar.ref.$link
+    botAvatarUrl = pds ? `${pds}/xrpc/com.atproto.sync.getBlob?did=${botDid}&cid=${cid}` : `/content/${botDid}/blob/${cid}`
+  }
+  authors.set(botDid, { did: botDid, handle: botHandle, avatarUrl: botAvatarUrl })
+
+  return authors
+}
+
+// Render chat threads list (conversations this user started)
+export function renderChatThreadList(
+  messages: ChatMessage[],
+  userDid: string,
+  userHandle: string,
+  botDid: string,
+  botHandle: string,
+  userProfile?: Profile | null,
+  botProfile?: Profile | null,
+  pds?: string
+): string {
+  // Build set of all message URIs
+  const allUris = new Set(messages.map(m => m.uri))
+
+  // Find root messages by this user:
+  // 1. No root field (explicit start of conversation)
+  // 2. Or root points to non-existent message (orphaned, treat as root)
+  //    For orphaned roots, only keep the oldest message per orphaned root URI
+  const orphanedRootFirstMsg = new Map<string, ChatMessage>()
+  const rootMessages: ChatMessage[] = []
+
+  for (const msg of messages) {
+    if (msg.value.author !== userDid) continue
+
+    if (!msg.value.root) {
+      // No root = explicit conversation start
+      rootMessages.push(msg)
+    } else if (!allUris.has(msg.value.root)) {
+      // Orphaned root - keep only the oldest message per orphaned root
+      const existing = orphanedRootFirstMsg.get(msg.value.root)
+      if (!existing || new Date(msg.value.createdAt) < new Date(existing.value.createdAt)) {
+        orphanedRootFirstMsg.set(msg.value.root, msg)
+      }
+    }
+  }
+
+  // Add orphaned root representatives
+  for (const msg of orphanedRootFirstMsg.values()) {
+    rootMessages.push(msg)
+  }
+
+  if (rootMessages.length === 0) {
+    return '<p class="no-posts">No chat threads yet.</p>'
+  }
+
+  const authors = buildAuthorMap(userDid, userHandle, botDid, botHandle, userProfile, botProfile, pds)
+
+  // Sort by createdAt (newest first)
+  const sorted = [...rootMessages].sort((a, b) =>
+    new Date(b.value.createdAt).getTime() - new Date(a.value.createdAt).getTime()
+  )
+
+  const items = sorted.map(msg => {
+    const authorDid = msg.value.author
+    const time = formatChatTime(msg.value.createdAt)
+    const rkey = getRkeyFromUri(msg.uri)
+    const author = authors.get(authorDid) || { did: authorDid, handle: authorDid.slice(0, 20) + '...' }
+
+    const avatarHtml = author.avatarUrl
+      ? `<img class="chat-avatar" src="${author.avatarUrl}" alt="@${escapeHtml(author.handle)}">`
+      : `<div class="chat-avatar-placeholder"></div>`
+
+    // Truncate content for preview
+    const preview = msg.value.content.length > 100
+      ? msg.value.content.slice(0, 100) + '...'
+      : msg.value.content
+
+    return `
+      <a href="/@${userHandle}/at/chat/${rkey}" class="chat-thread-item">
+        <div class="chat-avatar-col">
+          ${avatarHtml}
+        </div>
+        <div class="chat-thread-content">
+          <div class="chat-thread-header">
+            <span class="chat-author">@${escapeHtml(author.handle)}</span>
+            <span class="chat-time">${time}</span>
+          </div>
+          <div class="chat-thread-preview">${escapeHtml(preview)}</div>
+        </div>
+      </a>
+    `
+  }).join('')
+
+  return `<div class="chat-thread-list">${items}</div>`
+}
+
+// Render single chat thread (full conversation)
+export function renderChatThread(
+  messages: ChatMessage[],
+  rootRkey: string,
+  userDid: string,
+  userHandle: string,
+  botDid: string,
+  botHandle: string,
+  userProfile?: Profile | null,
+  botProfile?: Profile | null,
+  pds?: string
+): string {
+  // Find root message
+  const rootUri = `at://${userDid}/ai.syui.log.chat/${rootRkey}`
+  const rootMsg = messages.find(m => m.uri === rootUri)
+
+  if (!rootMsg) {
+    return '<p class="error">Chat thread not found.</p>'
+  }
+
+  // Find all messages in this thread
+  // 1. The root message itself
+  // 2. Messages with root === rootUri (direct children)
+  // 3. If this is an orphaned root (root points to non-existent), find siblings with same original root
+  const originalRoot = rootMsg.value.root
+  const allUris = new Set(messages.map(m => m.uri))
+  const isOrphanedRoot = originalRoot && !allUris.has(originalRoot)
+
+  const threadMessages = messages.filter(msg => {
+    // Include the root message itself
+    if (msg.uri === rootUri) return true
+    // Include messages that point to this as root
+    if (msg.value.root === rootUri) return true
+    // If orphaned, include messages with the same original root
+    if (isOrphanedRoot && msg.value.root === originalRoot) return true
+    return false
+  })
+
+  if (threadMessages.length === 0) {
+    return '<p class="error">No messages in this thread.</p>'
+  }
+
+  const authors = buildAuthorMap(userDid, userHandle, botDid, botHandle, userProfile, botProfile, pds)
+
+  // Sort by createdAt
+  const sorted = [...threadMessages].sort((a, b) =>
+    new Date(a.value.createdAt).getTime() - new Date(b.value.createdAt).getTime()
+  )
+
+  const items = sorted.map(msg => {
+    const authorDid = msg.value.author
+    const time = formatChatTime(msg.value.createdAt)
+    const rkey = getRkeyFromUri(msg.uri)
+    const author = authors.get(authorDid) || { did: authorDid, handle: authorDid.slice(0, 20) + '...' }
+
+    const avatarHtml = author.avatarUrl
+      ? `<img class="chat-avatar" src="${author.avatarUrl}" alt="@${escapeHtml(author.handle)}">`
+      : `<div class="chat-avatar-placeholder"></div>`
+
+    const content = renderMarkdown(msg.value.content)
+    const recordLink = `/@${author.handle}/at/collection/ai.syui.log.chat/${rkey}`
+
+    return `
+      <article class="chat-message">
+        <div class="chat-avatar-col">
+          ${avatarHtml}
+        </div>
+        <div class="chat-content-col">
+          <div class="chat-message-header">
+            <a href="/@${author.handle}" class="chat-author">@${escapeHtml(author.handle)}</a>
+            <a href="${recordLink}" class="chat-time">${time}</a>
+          </div>
+          <div class="chat-content">${content}</div>
+        </div>
+      </article>
+    `
+  }).join('')
+
+  return `<div class="chat-list">${items}</div>`
+}
+
+// Render chat list page
+export function renderChatListPage(
+  messages: ChatMessage[],
+  userDid: string,
+  userHandle: string,
+  botDid: string,
+  botHandle: string,
+  userProfile?: Profile | null,
+  botProfile?: Profile | null,
+  pds?: string
+): string {
+  const list = renderChatThreadList(messages, userDid, userHandle, botDid, botHandle, userProfile, botProfile, pds)
+  return `<div class="chat-container">${list}</div>`
+}
+
+// Render chat thread page
+export function renderChatThreadPage(
+  messages: ChatMessage[],
+  rootRkey: string,
+  userDid: string,
+  userHandle: string,
+  botDid: string,
+  botHandle: string,
+  userProfile?: Profile | null,
+  botProfile?: Profile | null,
+  pds?: string
+): string {
+  const thread = renderChatThread(messages, rootRkey, userDid, userHandle, botDid, botHandle, userProfile, botProfile, pds)
+  return `<div class="chat-container">${thread}</div>`
+}
--- a/src/web/components/mode-tabs.ts
+++ b/src/web/components/mode-tabs.ts
@@ -21,13 +21,18 @@ export function setCurrentLang(lang: string): void {
  localStorage.setItem('preferred-lang', lang)
 }

-export function renderModeTabs(handle: string, activeTab: 'blog' | 'browser' | 'post' = 'blog'): string {
+export function renderModeTabs(handle: string, activeTab: 'blog' | 'browser' | 'post' | 'chat' = 'blog', isLocalUser: boolean = false): string {
  let tabs = `
    <a href="/" class="tab">/</a>
    <a href="/@${handle}" class="tab ${activeTab === 'blog' ? 'active' : ''}">${handle}</a>
    <a href="/@${handle}/at" class="tab ${activeTab === 'browser' ? 'active' : ''}">at</a>
  `

+  // Chat tab only for local user (admin)
+  if (isLocalUser) {
+    tabs += `<a href="/@${handle}/at/chat" class="tab ${activeTab === 'chat' ? 'active' : ''}">chat</a>`
+  }
+
  if (isLoggedIn()) {
    tabs += `<a href="/@${handle}/at/post" class="tab ${activeTab === 'post' ? 'active' : ''}">post</a>`
  }
--- a/src/web/lib/api.ts
+++ b/src/web/lib/api.ts
@@ -1,5 +1,5 @@
 import { xrpcUrl, comAtprotoIdentity, comAtprotoRepo } from '../lexicons'
-import type { AppConfig, Networks, Profile, Post, ListRecordsResponse } from '../types'
+import type { AppConfig, Networks, Profile, Post, ListRecordsResponse, ChatMessage } from '../types'

 // Cache
 let configCache: AppConfig | null = null
@@ -368,3 +368,53 @@ export interface SearchPost {
  }
  record: unknown
 }
+
+// Load chat messages from both user and bot repos
+export async function getChatMessages(
+  userDid: string,
+  botDid: string,
+  collection: string = 'ai.syui.log.chat'
+): Promise<ChatMessage[]> {
+  const messages: ChatMessage[] = []
+
+  // Load from both DIDs
+  for (const did of [userDid, botDid]) {
+    // Try local first
+    try {
+      const res = await fetch(`/content/${did}/${collection}/index.json`)
+      if (res.ok && isJsonResponse(res)) {
+        const rkeys: string[] = await res.json()
+        for (const rkey of rkeys) {
+          const msgRes = await fetch(`/content/${did}/${collection}/${rkey}.json`)
+          if (msgRes.ok && isJsonResponse(msgRes)) {
+            messages.push(await msgRes.json())
+          }
+        }
+        continue
+      }
+    } catch {
+      // Try remote
+    }
+
+    // Remote fallback
+    const pds = await getPds(did)
+    if (!pds) continue
+
+    try {
+      const host = pds.replace('https://', '')
+      const url = `${xrpcUrl(host, comAtprotoRepo.listRecords)}?repo=${did}&collection=${collection}&limit=100`
+      const res = await fetch(url)
+      if (res.ok) {
+        const data: ListRecordsResponse<ChatMessage> = await res.json()
+        messages.push(...data.records)
+      }
+    } catch {
+      // Failed
+    }
+  }
+
+  // Sort by createdAt
+  return messages.sort((a, b) =>
+    new Date(a.value.createdAt).getTime() - new Date(b.value.createdAt).getTime()
+  )
+}
--- a/src/web/lib/router.ts
+++ b/src/web/lib/router.ts
@@ -1,5 +1,5 @@
 export interface Route {
-  type: 'home' | 'user' | 'post' | 'postpage' | 'atbrowser' | 'service' | 'collection' | 'record'
+  type: 'home' | 'user' | 'post' | 'postpage' | 'atbrowser' | 'service' | 'collection' | 'record' | 'chat' | 'chat-thread'
  handle?: string
  rkey?: string
  service?: string
@@ -51,6 +51,18 @@ export function parseRoute(): Route {
    return { type: 'postpage', handle: postPageMatch[1] }
  }

+  // Chat thread: /@handle/at/chat/{rkey}
+  const chatThreadMatch = path.match(/^\/@([^/]+)\/at\/chat\/([^/]+)$/)
+  if (chatThreadMatch) {
+    return { type: 'chat-thread', handle: chatThreadMatch[1], rkey: chatThreadMatch[2] }
+  }
+
+  // Chat list: /@handle/at/chat
+  const chatMatch = path.match(/^\/@([^/]+)\/at\/chat\/?$/)
+  if (chatMatch) {
+    return { type: 'chat', handle: chatMatch[1] }
+  }
+
  // Post detail page: /@handle/rkey (for config.collection)
  const postMatch = path.match(/^\/@([^/]+)\/([^/]+)$/)
  if (postMatch) {
@@ -79,6 +91,10 @@ export function navigate(route: Route): void {
    path = `/@${route.handle}/at/collection/${route.collection}`
  } else if (route.type === 'record' && route.handle && route.collection && route.rkey) {
    path = `/@${route.handle}/at/collection/${route.collection}/${route.rkey}`
+  } else if (route.type === 'chat' && route.handle) {
+    path = `/@${route.handle}/at/chat`
+  } else if (route.type === 'chat-thread' && route.handle && route.rkey) {
+    path = `/@${route.handle}/at/chat/${route.rkey}`
  }

  window.history.pushState({}, '', path)
--- a/src/web/main.ts
+++ b/src/web/main.ts
@@ -1,5 +1,5 @@
 import './styles/main.css'
-import { getConfig, resolveHandle, getProfile, getPosts, getPost, describeRepo, listRecords, getRecord, getPds, getNetworks } from './lib/api'
+import { getConfig, resolveHandle, getProfile, getPosts, getPost, describeRepo, listRecords, getRecord, getPds, getNetworks, getChatMessages } from './lib/api'
 import { parseRoute, onRouteChange, navigate, type Route } from './lib/router'
 import { login, logout, handleCallback, restoreSession, isLoggedIn, getLoggedInHandle, getLoggedInDid, deleteRecord, updatePost } from './lib/auth'
 import { validateRecord } from './lib/lexicon'
@@ -10,6 +10,7 @@ import { renderPostForm, setupPostForm } from './components/postform'
 import { renderCollectionButtons, renderServerInfo, renderServiceList, renderCollectionList, renderRecordList, renderRecordDetail } from './components/browser'
 import { renderModeTabs, renderLangSelector, setupModeTabs } from './components/mode-tabs'
 import { renderFooter } from './components/footer'
+import { renderChatListPage, renderChatThreadPage } from './components/chat'
 import { showLoading, hideLoading } from './components/loading'

 const app = document.getElementById('app')!
@@ -157,10 +158,11 @@ async function render(route: Route): Promise<void> {
    // Build page
    let html = renderHeader(handle, oauthEnabled)

-    // Mode tabs (Blog/Browser/Post/PDS)
+    // Mode tabs (Blog/Browser/Post/Chat/PDS)
    const activeTab = route.type === 'postpage' ? 'post' :
+      (route.type === 'chat' || route.type === 'chat-thread') ? 'chat' :
      (route.type === 'atbrowser' || route.type === 'service' || route.type === 'collection' || route.type === 'record' ? 'browser' : 'blog')
-    html += renderModeTabs(handle, activeTab)
+    html += renderModeTabs(handle, activeTab, localOnly)

    // Profile section
    if (profile) {
@@ -226,6 +228,29 @@ async function render(route: Route): Promise<void> {
      html += `<div id="post-form">${renderPostForm(config.collection)}</div>`
      html += `<nav class="back-nav"><a href="/@${handle}">${handle}</a></nav>`

+    } else if (route.type === 'chat') {
+      // Chat list page - show threads started by this user
+      const aiDid = 'did:plc:6qyecktefllvenje24fcxnie' // ai.syui.ai
+      const aiHandle = 'ai.syui.ai'
+
+      // Load messages for the current user (did) and bot
+      const chatMessages = await getChatMessages(did, aiDid, 'ai.syui.log.chat')
+      const aiProfile = await getProfile(aiDid, false)
+      const pds = await getPds(did)
+      html += `<div id="content">${renderChatListPage(chatMessages, did, handle, aiDid, aiHandle, profile, aiProfile, pds || undefined)}</div>`
+      html += `<nav class="back-nav"><a href="/@${handle}">${handle}</a></nav>`
+
+    } else if (route.type === 'chat-thread' && route.rkey) {
+      // Chat thread page - show full conversation
+      const aiDid = 'did:plc:6qyecktefllvenje24fcxnie' // ai.syui.ai
+      const aiHandle = 'ai.syui.ai'
+
+      const chatMessages = await getChatMessages(did, aiDid, 'ai.syui.log.chat')
+      const aiProfile = await getProfile(aiDid, false)
+      const pds = await getPds(did)
+      html += `<div id="content">${renderChatThreadPage(chatMessages, route.rkey, did, handle, aiDid, aiHandle, profile, aiProfile, pds || undefined)}</div>`
+      html += `<nav class="back-nav"><a href="/@${handle}/at/chat">chat</a></nav>`
+
    } else {
      // User page: compact collection buttons + posts
      const collections = await describeRepo(did)
--- a/src/web/styles/main.css
+++ b/src/web/styles/main.css
@@ -2271,3 +2271,216 @@ button.tab {
    color: #e0e0e0;
  }
 }
+
+/* Chat Styles - Bluesky social-app style */
+.chat-container {
+  margin: 10px 0;
+}
+
+.chat-list {
+  display: flex;
+  flex-direction: column;
+}
+
+.chat-message {
+  display: flex;
+  gap: 10px;
+  padding: 12px 0;
+  border-bottom: 1px solid #e0e0e0;
+}
+
+.chat-message:last-child {
+  border-bottom: none;
+}
+
+.chat-avatar-col {
+  flex-shrink: 0;
+}
+
+.chat-avatar {
+  width: 42px;
+  height: 42px;
+  border-radius: 50%;
+  object-fit: cover;
+}
+
+.chat-avatar-placeholder {
+  width: 42px;
+  height: 42px;
+  border-radius: 50%;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+}
+
+.chat-content-col {
+  flex: 1;
+  min-width: 0;
+}
+
+.chat-message-header {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  margin-bottom: 4px;
+}
+
+.chat-author {
+  font-weight: 600;
+  color: #1a1a1a;
+  text-decoration: none;
+  font-size: 0.95rem;
+}
+
+.chat-author:hover {
+  text-decoration: underline;
+}
+
+.chat-time {
+  color: #888;
+  font-size: 0.85rem;
+  text-decoration: none;
+}
+
+.chat-time:hover {
+  text-decoration: underline;
+  color: #666;
+}
+
+.chat-content {
+  line-height: 1.5;
+  color: #1a1a1a;
+}
+
+.chat-content p {
+  margin: 0 0 8px 0;
+}
+
+.chat-content p:last-child {
+  margin-bottom: 0;
+}
+
+.chat-content pre {
+  background: #f5f5f5;
+  padding: 10px;
+  border-radius: 8px;
+  overflow-x: auto;
+  font-size: 0.9rem;
+  margin: 8px 0;
+}
+
+.chat-content code {
+  background: #f0f0f0;
+  padding: 2px 6px;
+  border-radius: 4px;
+  font-size: 0.9em;
+}
+
+.chat-content pre code {
+  background: none;
+  padding: 0;
+}
+
+.chat-content a {
+  color: var(--btn-color);
+}
+
+/* Dark mode chat */
+@media (prefers-color-scheme: dark) {
+  .chat-message {
+    border-color: #333;
+  }
+
+  .chat-author {
+    color: #e0e0e0;
+  }
+
+  .chat-time {
+    color: #888;
+  }
+
+  .chat-time:hover {
+    color: #aaa;
+  }
+
+  .chat-content {
+    color: #e0e0e0;
+  }
+
+  .chat-content pre {
+    background: #2a2a2a;
+  }
+
+  .chat-content code {
+    background: #333;
+  }
+
+  .chat-avatar-placeholder {
+    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  }
+
+  .chat-thread-item {
+    border-color: #333;
+  }
+
+  .chat-thread-item:hover {
+    background: #2a2a2a;
+  }
+
+  .chat-thread-preview {
+    color: #999;
+  }
+}
+
+/* Chat Thread List */
+.chat-thread-list {
+  display: flex;
+  flex-direction: column;
+}
+
+.chat-thread-item {
+  display: flex;
+  gap: 10px;
+  padding: 12px;
+  border-bottom: 1px solid #e0e0e0;
+  text-decoration: none;
+  color: inherit;
+  transition: background-color 0.15s;
+}
+
+.chat-thread-item:hover {
+  background: #f5f5f5;
+}
+
+.chat-thread-item:last-child {
+  border-bottom: none;
+}
+
+.chat-thread-content {
+  flex: 1;
+  min-width: 0;
+}
+
+.chat-thread-header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 4px;
+}
+
+.chat-thread-header .chat-author {
+  font-weight: 600;
+  color: #1a1a1a;
+}
+
+.chat-thread-header .chat-time {
+  color: #888;
+  font-size: 0.85rem;
+}
+
+.chat-thread-preview {
+  color: #666;
+  font-size: 0.95rem;
+  line-height: 1.4;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
--- a/src/web/types.ts
+++ b/src/web/types.ts
@@ -64,3 +64,16 @@ export interface ListRecordsResponse<T> {
  records: T[]
  cursor?: string
 }
+
+export interface ChatMessage {
+  cid: string
+  uri: string
+  value: {
+    $type: string
+    content: string
+    author: string
+    createdAt: string
+    root?: string
+    parent?: string
+  }
+}