Fix project isolation: Make loadChatHistory respect active project sessions

- Modified loadChatHistory() to check for active project before fetching all sessions
- When active project exists, use project.sessions instead of fetching from API
- Added detailed console logging to debug session filtering
- This prevents ALL sessions from appearing in every project's sidebar

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.venv/lib/python3.11/site-packages/mcp/server/validation.py

@@ -0,0 +1,104 @@
+"""
+Shared validation functions for server requests.
+
+This module provides validation logic for sampling and elicitation requests
+that is shared across normal and task-augmented code paths.
+"""
+
+from mcp.shared.exceptions import McpError
+from mcp.types import (
+    INVALID_PARAMS,
+    ClientCapabilities,
+    ErrorData,
+    SamplingMessage,
+    Tool,
+    ToolChoice,
+)
+
+
+def check_sampling_tools_capability(client_caps: ClientCapabilities | None) -> bool:
+    """
+    Check if the client supports sampling tools capability.
+
+    Args:
+        client_caps: The client's declared capabilities
+
+    Returns:
+        True if client supports sampling.tools, False otherwise
+    """
+    if client_caps is None:
+        return False
+    if client_caps.sampling is None:
+        return False
+    if client_caps.sampling.tools is None:
+        return False
+    return True
+
+
+def validate_sampling_tools(
+    client_caps: ClientCapabilities | None,
+    tools: list[Tool] | None,
+    tool_choice: ToolChoice | None,
+) -> None:
+    """
+    Validate that the client supports sampling tools if tools are being used.
+
+    Args:
+        client_caps: The client's declared capabilities
+        tools: The tools list, if provided
+        tool_choice: The tool choice setting, if provided
+
+    Raises:
+        McpError: If tools/tool_choice are provided but client doesn't support them
+    """
+    if tools is not None or tool_choice is not None:
+        if not check_sampling_tools_capability(client_caps):
+            raise McpError(
+                ErrorData(
+                    code=INVALID_PARAMS,
+                    message="Client does not support sampling tools capability",
+                )
+            )
+
+
+def validate_tool_use_result_messages(messages: list[SamplingMessage]) -> None:
+    """
+    Validate tool_use/tool_result message structure per SEP-1577.
+
+    This validation ensures:
+    1. Messages with tool_result content contain ONLY tool_result content
+    2. tool_result messages are preceded by a message with tool_use
+    3. tool_result IDs match the tool_use IDs from the previous message
+
+    See: https://github.com/modelcontextprotocol/modelcontextprotocol/issues/1577
+
+    Args:
+        messages: The list of sampling messages to validate
+
+    Raises:
+        ValueError: If the message structure is invalid
+    """
+    if not messages:
+        return
+
+    last_content = messages[-1].content_as_list
+    has_tool_results = any(c.type == "tool_result" for c in last_content)
+
+    previous_content = messages[-2].content_as_list if len(messages) >= 2 else None
+    has_previous_tool_use = previous_content and any(c.type == "tool_use" for c in previous_content)
+
+    if has_tool_results:
+        # Per spec: "SamplingMessage with tool result content blocks
+        # MUST NOT contain other content types."
+        if any(c.type != "tool_result" for c in last_content):
+            raise ValueError("The last message must contain only tool_result content if any is present")
+        if previous_content is None:
+            raise ValueError("tool_result requires a previous message containing tool_use")
+        if not has_previous_tool_use:
+            raise ValueError("tool_result blocks do not match any tool_use in the previous message")
+
+    if has_previous_tool_use and previous_content:
+        tool_use_ids = {c.id for c in previous_content if c.type == "tool_use"}
+        tool_result_ids = {c.toolUseId for c in last_content if c.type == "tool_result"}
+        if tool_use_ids != tool_result_ids:
+            raise ValueError("ids of tool_result blocks and tool_use blocks from previous message do not match")