Update docs: 2.6.0...2.6.7 changes, update project and feature settings (#254)

Included changes from:
- Chainlit/chainlit#2299
- Chainlit/chainlit#2292
- Chainlit/chainlit#2271
- Chainlit/chainlit#2347
- Chainlit/chainlit#2364

Closes #251, #252

Also fixed boolean field values in some files

Author: asvishnyakov

advanced-features/mcp.mdx

@@ -1,11 +1,11 @@
 ---
-title: "MCP Servers"
+title: "MCP"
 description: Model Control Protocol (MCP) allows you to integrate external tool providers with your Chainlit application. This enables your AI models to use tools through standardized interfaces.
 ---
 
 ## Overview
 
-MCP provides a mechanism for Chainlit applications to connect to either server-sent events (SSE) based services or command-line (stdio) based tools. Once connected, your application can discover available tools, execute them, and integrate their responses into your application's flow.
+MCP provides a mechanism for Chainlit applications to connect to either server-sent events (SSE) or streamable HTTP based services, or command-line (stdio) based tools. Once connected, your application can discover available tools, execute them, and integrate their responses into your application's flow.
 
  <Card
     title="Chainlit MCP Cookbook"
@@ -31,10 +31,15 @@ We're working with companies to create their MCP stacks, enabling AI agents to c
 
 ## Connections Types
 
-Chainlit supports two types of MCP connections:
+| WebSockets | HTTP+SSE | Streamable HTTP | stdio |
+| ---------- | -------- | --------------- | ----- |
+| ❌         | ✅       | ✅              | ✅    |
+
+Chainlit supports three types of MCP connections:
 
 1. **SSE (Server-Sent Events)**: Connect to a remote service via HTTP
-2. **stdio**: Execute a local command and communicate via standard I/O
+2. **Streamable HTTP**: Send HTTP requests to a server and receive JSON responses or connect using SSE streams
+3. **stdio**: Execute a local command and communicate via standard I/O
 
 > ⚠️ **Security Warning**: The stdio connection type spawns actual subprocesses on the Chainlit server. Only use this with trusted commands in controlled environments. Ensure proper validation of user inputs to prevent command injection vulnerabilities.
 
@@ -44,7 +49,7 @@ Chainlit supports two types of MCP connections:
 
 You can control which MCP connection types are enabled globally and restrict allowed stdio commands by modifying your project's `config.toml` file (usually located at the root of your project or `.chainlit/config.toml`).
 
-Under the `[features.mcp]` section, you can configure SSE and stdio separately:
+Under the `[features.mcp]` section, you can configure SSE, Streamable HTTP and stdio separately:
 
 ```toml
 [features]
@@ -54,6 +59,10 @@ Under the `[features.mcp]` section, you can configure SSE and stdio separately:
     # Enable or disable the SSE connection type globally
     enabled = true
 
+[features.mcp.streamable-http]
+    # Enable or disable the Streamable HTTP connection type globally
+    enabled = true
+
 [features.mcp.stdio]
     # Enable or disable the stdio connection type globally
     enabled = true
@@ -92,8 +101,8 @@ async def on_mcp_disconnect(name: str, session: ClientSession):
 The client needs to provide the connection details through the Chainlit interface. This includes:
 
 - Connection name (unique identifier)
-- Client type (`sse` or `stdio`)
-- For SSE: URL endpoint
+- Client type (`sse`, `streamable-http` or `stdio`)
+- For SSE and Streamable HTTP: URL endpoint
 - For stdio: Full command (e.g., `npx your-tool-package` or `uvx your-tool-package`)
 
 <Frame caption="Adding an MCP">

api-reference/ask/ask-for-action.mdx

@@ -21,7 +21,7 @@ If a project ID is configured, the messages will be uploaded to the cloud storag
 <ParamField path="timeout" type="int" optional default={90}>
   The number of seconds to wait for an answer before raising a TimeoutError.
 </ParamField>
-<ParamField path="raise_on_timeout" type="bool" optional default="False">
+<ParamField path="raise_on_timeout" type="bool" optional default={false}>
   Whether to raise a socketio TimeoutError if the user does not answer in time.
 </ParamField>
 

api-reference/ask/ask-for-element.mdx

@@ -23,7 +23,7 @@ If a project ID is configured, the messages will be uploaded to the cloud storag
 <ParamField path="timeout" type="int" optional default={90}>
   The number of seconds to wait for an answer before raising a TimeoutError.
 </ParamField>
-<ParamField path="raise_on_timeout" type="bool" optional default="False">
+<ParamField path="raise_on_timeout" type="bool" optional default={false}>
   Whether to raise a socketio TimeoutError if the user does not answer in time.
 </ParamField>
 

api-reference/ask/ask-for-file.mdx

@@ -28,7 +28,7 @@ If a project ID is configured, the messages will be uploaded to the cloud storag
 <ParamField path="timeout" type="int" optional default={90}>
   The number of seconds to wait for an answer before raising a TimeoutError.
 </ParamField>
-<ParamField path="raise_on_timeout" type="bool" optional default="False">
+<ParamField path="raise_on_timeout" type="bool" optional default={false}>
   Whether to raise a socketio TimeoutError if the user does not answer in time.
 </ParamField>
 

api-reference/ask/ask-for-input.mdx

@@ -18,7 +18,7 @@ If a project ID is configured, the messages will be uploaded to the cloud storag
 <ParamField path="timeout" type="int" optional default={60}>
   The number of seconds to wait for an answer before raising a TimeoutError.
 </ParamField>
-<ParamField path="raise_on_timeout" type="bool" optional default="False">
+<ParamField path="raise_on_timeout" type="bool" optional default={false}>
   Whether to raise a socketio TimeoutError if the user does not answer in time.
 </ParamField>
 

api-reference/step-class.mdx

@@ -20,7 +20,7 @@ The `Step` class is a Python Context Manager that can be used to create steps in
   https://react-code-blocks-rajinwonderland.vercel.app/?path=/story/codeblock--supported-languages
   for a list of supported languages.
 </ParamField>
-<ParamField path="show_input" type="Union[bool, str]" default="False" optional>
+<ParamField path="show_input" type="Union[bool, str]" default={false} optional>
   By default only the output of the step is shown. Set this to `True` to also
   show the input. You can also set this to a language like `json` or `python` to
   syntax highlight the input.

api-reference/step-decorator.mdx

@@ -19,7 +19,7 @@ Under the hood, the step decorator is using the [cl.Step](/api-reference/step-cl
   https://react-code-blocks-rajinwonderland.vercel.app/?path=/story/codeblock--supported-languages
   for a list of supported languages.
 </ParamField>
-<ParamField path="show_input" type="Union[bool, str]" default="False" optional>
+<ParamField path="show_input" type="Union[bool, str]" default={false} optional>
   By default only the output of the step is shown. Set this to `True` to also
   show the input. You can also set this to a language like `json` or `python` to
   syntax highlight the input.

backend/config/features.mdx

@@ -2,60 +2,111 @@
 title: Features
 ---
 
-### Options
+## Options
 
-<ParamField path="unsafe_allow_html" type="bool" default={false}>
-  Process and display HTML in messages. This can be a security risk (see
-  https://stackoverflow.com/questions/19603097/why-is-it-dangerous-to-render-user-generated-html-or-javascript).
-</ParamField>
-
-<ParamField path="edit_message" type="bool" default={true}>
-  Allow the user to edit their messages.
-</ParamField>
-
-<ParamField path="latex" type="bool" default={false}>
-  Process and display mathematical expressions. This can clash with "$"
-  characters in messages.
-</ParamField>
+### File Upload
 
-<ParamField path="spontaneous_file_upload.enabled" type="bool" default={true}>
+<ParamField path="spontaneous_file_upload.enabled" type="bool" optional>
   Authorize users to upload files with messages. The files are then accessible
   in [cl.on_message](/api-reference/lifecycle-hooks/on-message).
 </ParamField>
 
 <ParamField
   path="spontaneous_file_upload.accept"
   type="Union[List[str], Dict[str, List[str]]]"
-  default={["*/*"]}
+  optional
 >
   Restrict user to only upload accepted mime file types. Example: ["text/plain",
   "application/pdf", "image/x-png"]
 </ParamField>
 
-<ParamField path="spontaneous_file_upload.max_files" type="int" default={20}>
+<ParamField path="spontaneous_file_upload.max_files" type="int" optional>
   Restrict user to upload maximum number of files at a time.
 </ParamField>
 
-<ParamField path="spontaneous_file_upload.max_size_mb" type="int" default={500}>
+<ParamField path="spontaneous_file_upload.max_size_mb" type="int" optional>
   Restrict uploading file size (MB).
 </ParamField>
 
-<ParamField path="auto_tag_thread" type="bool">
+### Audio
+
+<ParamField path="audio.enabled" type="bool" default={false}>
+  Restrict uploading file size (MB).
+</ParamField>
+
+<ParamField path="audio.sample_rate" type="int" default={24000}>
+  Audio sample rate in hertz. Defaults to 24kHz
+</ParamField>
+
+### MCP
+
+See [MCP server-side configuration](/advanced-features/mcp#server-side-configuration-config-toml)
+
+### Slack
+
+See [Slack integration documentation](/deploy/slack)
+
+### Other
+
+<ParamField path="latex" type="bool" default={false}>
+  Process and display mathematical expressions. This can clash with "$"
+  characters in messages.
+</ParamField>
+
+<ParamField path="user_message_autoscroll" type="bool" default={true}>
+  Autoscroll new user messages at the top of the window.
+</ParamField>
+
+<ParamField path="unsafe_allow_html" type="bool" default={false}>
+  Process and display HTML in messages. This can be a security risk (see
+  https://stackoverflow.com/questions/19603097/why-is-it-dangerous-to-render-user-generated-html-or-javascript).
+</ParamField>
+
+<ParamField path="auto_tag_thread" type="bool" default={true}>
   Automatically tag threads with the current chat profile (if a chat profile is
   used)
 </ParamField>
 
-### Default configuration
+<ParamField path="edit_message" type="bool" default={true}>
+  Allow the user to edit their messages.
+</ParamField>
+
+## Default configuration
 
 ```toml
 [features]
-edit_message = true
+# Process and display HTML in messages. This can be a security risk (see https://stackoverflow.com/questions/19603097/why-is-it-dangerous-to-render-user-generated-html-or-javascript)
 unsafe_allow_html = false
+
+# Process and display mathematical expressions. This can clash with "$" characters in messages.
 latex = false
+
+# Autoscroll new user messages at the top of the window
+user_message_autoscroll = true
+
+# Automatically tag threads with the current chat profile (if a chat profile is used)
+auto_tag_thread = true
+
+# Allow users to edit their own messages
+edit_message = true
+
+# Authorize users to spontaneously upload files with messages
 [features.spontaneous_file_upload]
     enabled = true
+    # Define accepted file types using MIME types
+    # Examples:
+    # 1. For specific file types:
+    #    accept = ["image/jpeg", "image/png", "application/pdf"]
+    # 2. For all files of certain type:
+    #    accept = ["image/*", "audio/*", "video/*"]
+    # 3. For specific file extensions:
+    #    accept = {{ "application/octet-stream" = [".xyz", ".pdb"] }}
+    # Note: Using "*/*" is not recommended as it may cause browser warnings
     accept = ["*/*"]
     max_files = 20
     max_size_mb = 500
-auto_tag_thread = true
+
+[features.audio]
+    # Sample rate of the audio
+    sample_rate = 24000
 ```

backend/config/project.mdx

@@ -2,50 +2,52 @@
 title: Project
 ---
 
-### Options
-
-<ParamField path="enable_telemetry" type="bool" default={true}>
-  Whether to enable telemetry (default: true). No personal data is collected.
-</ParamField>
+## Options
 
 <ParamField path="allow_origins" type="List[str]" default={["*"]}>
   Authorized origins to access the app/copilot.
 </ParamField>
 
-<ParamField path="user_env" type="List[str]" default={[]}>
-  List of environment variables to be provided by each user to use the app.
+<ParamField path="transports" type="List[str]" optional>
+  Socket.io client transports option
 </ParamField>
 
-<ParamField path="session_timeout" type="int" default={3600}>
-  Duration (in seconds) during which the session is saved when the connection is
-  lost
+<ParamField path="user_env" type="List[str]" optional>
+  List of environment variables to be provided by each user to use the app. If empty, no environment variables will be asked to the user.
 </ParamField>
 
-<ParamField path="cache" type="bool" default={false}>
-  Enable third parties caching (e.g LangChain cache)
+<ParamField path="lc_cache_path" type="str" optional>
+  Path to the local langchain cache database
+</ParamField>
+
+<ParamField path="session_timeout" type="int" default={300}>
+  Duration (in seconds) during which the session is saved when the connection is lost
 </ParamField>
 
-<ParamField path="follow_symlink" type="bool" default={false}>
-  Follow symlink for asset mount (see
-  https://github.com/Chainlit/chainlit/issues/317)
+<ParamField path="user_session_timeout" type="int" default={1296000}>
+  Duration (in seconds) of the user session expiry. 15 days by default
 </ParamField>
 
-### Default configuration
+<ParamField path="cache" type="bool" default={false}>
+  Enable third parties caching (e.g LangChain cache)
+</ParamField>
+
+## Default configuration
 
 ```toml
 [project]
-# Whether to enable telemetry (default: true). No personal data is collected.
-enable_telemetry = true
-
 # List of environment variables to be provided by each user to use the app.
 user_env = []
 
 # Duration (in seconds) during which the session is saved when the connection is lost
 session_timeout = 3600
 
-# Enable third parties caching (e.g LangChain cache)
+# Duration (in seconds) of the user session expiry
+user_session_timeout = 1296000  # 15 days
+
+# Enable third parties caching (e.g., LangChain cache)
 cache = false
 
-# Follow symlink for asset mount (see https://github.com/Chainlit/chainlit/issues/317)
-# follow_symlink = false
+# Authorized origins
+allow_origins = ["*"]
 ```

backend/config/ui.mdx

@@ -2,7 +2,7 @@
 title: UI
 ---
 
-### Options
+## Options
 
 <ParamField path="name" type="str" default="'Assistant'">
   The name of both the application and the chatbot.
@@ -90,7 +90,7 @@ title: UI
 </ParamField>
 
 
-### Default configuration
+## Default configuration
 
 ```toml
 [UI]