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layout default
title Chapter 4: Skills and Slash Command Extensions
nav_order 4
parent Mistral Vibe Tutorial

Chapter 4: Skills and Slash Command Extensions

Welcome to Chapter 4: Skills and Slash Command Extensions. In this part of Mistral Vibe Tutorial: Minimal CLI Coding Agent by Mistral, you will build an intuitive mental model first, then move into concrete implementation details and practical production tradeoffs.

Vibe's skills system enables reusable behavior packages and user-invocable slash command extensions.

Skill Benefits

  • codify recurring team standards
  • attach specialized prompts/workflows
  • expose custom slash commands where needed

Skill Design Guidance

  1. keep skill descriptions concise and task-specific
  2. declare allowed tools clearly for safety
  3. store skills in shared repository paths for consistency

Source References

Summary

You now have a strategy for turning ad hoc prompt patterns into reusable Vibe skills.

Next: Chapter 5: Subagents and Task Delegation

Source Code Walkthrough

vibe/core/types.py

The ReasoningEvent class in vibe/core/types.py handles a key part of this chapter's functionality:

class ReasoningEvent(BaseEvent):
    content: str
    message_id: str | None = None


class ToolCallEvent(BaseEvent):
    tool_call_id: str
    tool_name: str
    tool_class: type[BaseTool]
    tool_call_index: int | None = None
    args: BaseModel | None = None


class ToolResultEvent(BaseEvent):
    tool_name: str
    tool_class: type[BaseTool] | None
    result: BaseModel | None = None
    error: str | None = None
    skipped: bool = False
    skip_reason: str | None = None
    cancelled: bool = False
    duration: float | None = None
    tool_call_id: str


class ToolStreamEvent(BaseEvent):
    tool_name: str
    message: str
    tool_call_id: str

This class is important because it defines how Mistral Vibe Tutorial: Minimal CLI Coding Agent by Mistral implements the patterns covered in this chapter.

vibe/core/types.py

The ToolCallEvent class in vibe/core/types.py handles a key part of this chapter's functionality:

class ToolCallEvent(BaseEvent):
    tool_call_id: str
    tool_name: str
    tool_class: type[BaseTool]
    tool_call_index: int | None = None
    args: BaseModel | None = None


class ToolResultEvent(BaseEvent):
    tool_name: str
    tool_class: type[BaseTool] | None
    result: BaseModel | None = None
    error: str | None = None
    skipped: bool = False
    skip_reason: str | None = None
    cancelled: bool = False
    duration: float | None = None
    tool_call_id: str


class ToolStreamEvent(BaseEvent):
    tool_name: str
    message: str
    tool_call_id: str


class WaitingForInputEvent(BaseEvent):
    task_id: str
    label: str | None = None
    predefined_answers: list[str] | None = None

This class is important because it defines how Mistral Vibe Tutorial: Minimal CLI Coding Agent by Mistral implements the patterns covered in this chapter.

vibe/core/types.py

The ToolResultEvent class in vibe/core/types.py handles a key part of this chapter's functionality:

class ToolResultEvent(BaseEvent):
    tool_name: str
    tool_class: type[BaseTool] | None
    result: BaseModel | None = None
    error: str | None = None
    skipped: bool = False
    skip_reason: str | None = None
    cancelled: bool = False
    duration: float | None = None
    tool_call_id: str


class ToolStreamEvent(BaseEvent):
    tool_name: str
    message: str
    tool_call_id: str


class WaitingForInputEvent(BaseEvent):
    task_id: str
    label: str | None = None
    predefined_answers: list[str] | None = None


class CompactStartEvent(BaseEvent):
    current_context_tokens: int
    threshold: int
    # WORKAROUND: Using tool_call to communicate compact events to the client.
    # This should be revisited when the ACP protocol defines how compact events
    # should be represented.

This class is important because it defines how Mistral Vibe Tutorial: Minimal CLI Coding Agent by Mistral implements the patterns covered in this chapter.

vibe/core/types.py

The ToolStreamEvent class in vibe/core/types.py handles a key part of this chapter's functionality:

class ToolStreamEvent(BaseEvent):
    tool_name: str
    message: str
    tool_call_id: str


class WaitingForInputEvent(BaseEvent):
    task_id: str
    label: str | None = None
    predefined_answers: list[str] | None = None


class CompactStartEvent(BaseEvent):
    current_context_tokens: int
    threshold: int
    # WORKAROUND: Using tool_call to communicate compact events to the client.
    # This should be revisited when the ACP protocol defines how compact events
    # should be represented.
    # [RFD](https://agentclientprotocol.com/rfds/session-usage)
    tool_call_id: str


class CompactEndEvent(BaseEvent):
    old_context_tokens: int
    new_context_tokens: int
    summary_length: int
    # WORKAROUND: Using tool_call to communicate compact events to the client.
    # This should be revisited when the ACP protocol defines how compact events
    # should be represented.
    # [RFD](https://agentclientprotocol.com/rfds/session-usage)

This class is important because it defines how Mistral Vibe Tutorial: Minimal CLI Coding Agent by Mistral implements the patterns covered in this chapter.

How These Components Connect

flowchart TD
    A[ReasoningEvent]
    B[ToolCallEvent]
    C[ToolResultEvent]
    D[ToolStreamEvent]
    E[WaitingForInputEvent]
    A --> B
    B --> C
    C --> D
    D --> E
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