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docs[patch]: In conceptual docs explain constraints on ToolMessage (#26792)

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Minor clarification
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Eugene Yurtsev 2024-09-25 09:34:45 -04:00 committed by GitHub
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@ -116,14 +116,14 @@ These also have corresponding async methods that should be used with [asyncio](h
The **input type** and **output type** varies by component:
| Component | Input Type | Output Type |
| --- | --- | --- |
| Prompt | Dictionary | PromptValue |
| ChatModel | Single string, list of chat messages or a PromptValue | ChatMessage |
| LLM | Single string, list of chat messages or a PromptValue | String |
| OutputParser | The output of an LLM or ChatModel | Depends on the parser |
| Retriever | Single string | List of Documents |
| Tool | Single string or dictionary, depending on the tool | Depends on the tool |
| Component | Input Type | Output Type |
|--------------|-------------------------------------------------------|-----------------------|
| Prompt | Dictionary | PromptValue |
| ChatModel | Single string, list of chat messages or a PromptValue | ChatMessage |
| LLM | Single string, list of chat messages or a PromptValue | String |
| OutputParser | The output of an LLM or ChatModel | Depends on the parser |
| Retriever | Single string | List of Documents |
| Tool | Single string or dictionary, depending on the tool | Depends on the tool |
All runnables expose input and output **schemas** to inspect the inputs and outputs:
@ -236,7 +236,7 @@ This is where information like log-probs and token usage may be stored.
**`tool_calls`**
These represent a decision from an language model to call a tool. They are included as part of an `AIMessage` output.
These represent a decision from a language model to call a tool. They are included as part of an `AIMessage` output.
They can be accessed from there with the `.tool_calls` property.
This property returns a list of `ToolCall`s. A `ToolCall` is a dictionary with the following arguments:
@ -256,6 +256,8 @@ This represents a message with role "tool", which contains the result of calling
- a `tool_call_id` field which conveys the id of the call to the tool that was called to produce this result.
- an `artifact` field which can be used to pass along arbitrary artifacts of the tool execution which are useful to track but which should not be sent to the model.
With most chat models, a `ToolMessage` can only appear in the chat history after an `AIMessage` that has a populated `tool_calls` field.
#### (Legacy) FunctionMessage
This is a legacy message type, corresponding to OpenAI's legacy function-calling API. `ToolMessage` should be used instead to correspond to the updated tool-calling API.