Tool System EN

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Three Kinds of Tools

Category	Source	Example
Built-in system tools	Bundled with BIT	shell, read/write/edit, memory, skills, etc.
AI-created tools	Scripts registered by the AI through a built-in tool	"Wrap this piece of code into a tool"
MCP tools	External MCP servers	See MCP Integration

AI-Created Tools

The AI can:

1. Run a script directly: write a script that talks to BIT and run it immediately
2. Persist it as a permanent tool: register the script as a tool so it can be called repeatedly afterwards
3. Overwrite its own tools: replace tools it created earlier under the same name

Limit: system tools and remote tools cannot be overwritten; duplicate names raise an error.

Tool registration, updates, deletion, and MCP integration take effect immediately (hot reload via the tools-updated event)—no app restart required.

Approval Mechanism

• Tool calls that require approval pop up a confirmation card showing the tool name and arguments
• Automatic rejection after 120 seconds without a response
• Clicking "Stop" while waiting cancels immediately
• Both approval requests and their results are recorded in the Audit Log

Concurrency and Fault Tolerance

• Multiple tool calls in one turn execute concurrently, up to 16
• Results are fed back to the model in call order (the same order in which they were initiated)
• If a tool is unavailable or execution is interrupted, the error message is returned to the model instead of being silently dropped

Shell Tool Parameters

• Timeout: 600 seconds
• Output truncation limit: 60,000 characters
• Interrupting a session also terminates the shell process

Manual Invocation

On the Tools page you can manually invoke any tool, enable/disable it, or delete it—handy for debugging script tools created by the AI.