Tools: should output from tools have a conventional key as well?

[tslmy]

There is llm.output_messages for LLM calls. There is embedding.vector for embedding model calls. There is retrieval.documents for retrieval results. But there is no tool_call.output for tool calls:

open-inference-spec/trace/spec/semantic_conventions.md

Lines 42 to 43 in d03ce2f

	| `tool.description` | String | `"An API to get weather data."` | Description of the tool's purpose and functionality |
	| `tool.parameters` | JSON string | `"{ 'a': 'int' }"` | The parameters definition for invoking the tool |

Should we add it?

I believe this is the cause of run-llama/llama_index#9770 .

[mikeldking]

hi @tslmy thanks for filing an issue. Good call-out. the output of tools very often shows up in the subsequent LLM call but you are right - it's probably a good idea to capture this as part of the span. We will work with the LlamaIndex team to get visibility into this!