Problemsby GlyphTrouble with LlamaIndex functiontool
3 posts from 3 people3d activeFading, +0 this week
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[Bug]: `FunctionTool` turns an empty list result into empty content instead of `[]`
### Bug Description `FunctionTool._parse_tool_output` treats a list as a list of content blocks when `all(isinstance(item, ...) for item in raw_output)`. For an empty list `all(...)` is true, so the list is returned as zero blocks and `ToolOutput.content` is `""`, while `[0, 1]`...
[Bug]: FunctionTool doesn't detect ctx: Context when the module uses "from __future__ import annotations"
### Bug Description `FunctionTool` finds the workflow-context parameter by comparing each annotation with `Context` (`_is_context_param` in `llama_index/core/tools/function_tool.py`), using `inspect.signature(fn)`. Under `from __future__ import annotations` (PEP 563) every...
[Bug]: FunctionTool wraps a returned ToolOutput as a success and drops is_error
### Bug Description `FunctionTool.call` / `acall` always build a **new** `ToolOutput` around the function's return value. `is_error` defaults to `False`. They never check whether the function already returned a `ToolOutput`. So this is a success: `FunctionAgent._call_tool` only...
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About this problem
Evidence
3 posts from 3 people in 1 place, about 1 a week over 61 days. Mostly on run-llama/llama_index. Tools named alongside: GitHub.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts about LlamaIndex with no known issue, sharing the word "functiontool". First post Sep 2, 2026, latest Nov 1, 2026. Corroborated: 3 or more posts from 2 or more people or places. Method
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