From 2a7b34163452c169ccc443f810f698f94ac1c976 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Thu, 9 Apr 2026 02:57:11 +0000
Subject: [PATCH] Add help tooltip to Transaction Cost input

- Added a tooltip to the Transaction Cost input explaining that 10 bps is 0.10%
- Formatted the addition specifically so it adheres to Black formatting rules
- Updated the `.Jules/palette.md` journal

Co-authored-by: aarjava <218419324+aarjava@users.noreply.github.com>
---
 .Jules/palette.md |  3 +++
 src/dashboard.py  | 10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 .Jules/palette.md

diff --git a/.Jules/palette.md b/.Jules/palette.md
new file mode 100644
index 0000000..af6b81f
--- /dev/null
+++ b/.Jules/palette.md
@@ -0,0 +1,3 @@
+## 2024-04-09 - Concrete Unit Conversions in Financial Inputs
+**Learning:** Users can misinterpret unit inputs in financial applications (like basis points vs percentage). Tooltips with concrete examples reduce cognitive load and prevent input errors.
+**Action:** When adding numeric inputs for domain-specific units (bps, bps/year), provide a concrete example conversion in the `help` tooltip parameter (e.g. `10 bps = 0.10%`).
diff --git a/src/dashboard.py b/src/dashboard.py
index 4156c1d..125c9fc 100644
--- a/src/dashboard.py
+++ b/src/dashboard.py
@@ -190,7 +190,15 @@ def get_cache_key(*args) -> str:
 
     if mode == "Single-Asset":
         st.subheader("5. Backtest Settings")
-        bt_cost = st.number_input("Transaction Cost (bps)", value=DEFAULT_COST_BPS, step=1) / 10000
+        bt_cost = (
+            st.number_input(
+                "Transaction Cost (bps)",
+                value=DEFAULT_COST_BPS,
+                step=1,
+                help="10 bps = 0.10%",
+            )
+            / 10000
+        )
         allow_short = st.checkbox("Allow Short Selling?", value=False)
     else:
         st.subheader("5. Alert Thresholds")