tool_context() equivalent: per-conversation store and tool-calling context

[cpsievert]

ellmer recently added tool_context() plus a per-conversation chat$store environment (tidyverse/ellmer#1023, part of tidyverse/ellmer#871). Tools can use it to access per-conversation state without globals, and it survives clone(deep = TRUE).

chatlas has no equivalent: there's no contextvar-based way for a running tool to access the current chat/tool-call context, and no per-chat mutable store.

Possible shape on the Python side: a tool_context() accessor backed by a contextvars.ContextVar set around tool invocation, plus a chat.store dict (or similar) that tools can read/write.

[AbarnaaSree]

Hi, I’d like to work on this issue. I can implement the tool_context() accessor using contextvars, add a per-conversation chat.store, wire the context into tool invocation, and add tests covering context isolation, tool access, and deep cloning. Please let me know if I can take this up.