matplotlib-charts

name	matplotlib-charts
description	Produce PNG charts with matplotlib. Save to chart-<slug>.png in the working directory.

Matplotlib Charts

Format

• One chart per question. No subplots unless the user asks.
• figsize=(10, 6); keep labels readable.
• Save as PNG with plt.savefig(path, dpi=120, bbox_inches="tight").
• Do not call plt.show() — the environment is headless (MPLBACKEND=Agg).

Style

• Default matplotlib style is fine; avoid exotic third-party themes.
• Set a clear title, x/y labels, and rotate x ticks if labels overlap.

Return contract

After saving the chart, your FINAL assistant message must include exactly one line:

[CHART] chart-<slug>.png

The host UI parses this marker to render the image. Do not wrap it in code fences, backticks, or quotes.

Example

import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt

fig, ax = plt.subplots(figsize=(10, 6))
ax.bar(products, revenues)
ax.set_title("Revenue by product")
ax.set_ylabel("Revenue ($)")
plt.savefig("chart-revenue.png", dpi=120, bbox_inches="tight")

Then end your reply with:

[CHART] chart-revenue.png