Installs into .claude/skills of the current project.
Are you the author of Agilab Streamlit Pages?
Add the live security badge to your README. It updates with every re-scan.
[](https://www.skillsdirectory.com/skills/david-li0406-agilab-streamlit-pages)
---
name: agilab-streamlit-pages
description: Streamlit page authoring patterns for AGILAB (session_state safety, keys, rerun, UX).
license: BSD-3-Clause (see repo LICENSE)
metadata:
updated: 2026-01-09
---
# Streamlit Pages Skill (AGILAB)
Use this skill when editing:
- `src/agilab/AGILAB.py`
- `src/agilab/pages/*.py`
- `src/agilab/apps-pages/*/src/*/*.py`
## Session State Rules (Avoid Common Crashes)
- Never assign `st.session_state["k"] = …` **after** a widget with `key="k"` was created.
- Prefer `st.session_state.setdefault("k", default)` before the widget.
- Or use widget return values and compute derived state separately.
- If you need to “reset” a widget value:
- Use a different key (versioned key pattern), or
- Gate the reset behind a rerun and only mutate state before widget creation.
## Recommended Pattern
1. Initialize defaults with `setdefault` at the top of the page.
2. Render widgets.
3. Read values from widgets, compute derived state, store under *different* keys.
## Rerun API
- Do not use `st.experimental_rerun()`; use `st.rerun()`.
## Key Hygiene
- Every widget must have a stable, unique key.
- Prefer namespaced keys: `f\"{page_id}:df_files\"`, not `"df_files"`.
