fix - in FileSurfer & CoderAgent, make sure to replace the datetime variable in prompts at runtime and not on object creation

[ksachdeva]

The agent/object may be alive for more than a day.

[Copilot]

Pull Request Overview

This PR fixes the issue of using a stale datetime in prompts by dynamically computing the current date at runtime in both the FileSurfer and CoderAgent classes.

• In FileSurfer, the static date initialization is removed and the prompt is built at runtime.
• In CoderAgent, the system prompt is now generated at runtime to avoid outdated dates.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/magentic_ui/agents/file_surfer/_file_surfer.py	Removed static datetime and now computes date in monitor_pause
src/magentic_ui/agents/_coder.py	Replaced static prompt with a runtime datetime value

Comments suppressed due to low confidence (2)

src/magentic_ui/agents/file_surfer/_file_surfer.py:270

• [nitpick] Consider extracting the repeated datetime computation (datetime.now().strftime("%Y-%m-%d")) into a helper method to reduce duplication and improve maintainability.

system_prompt_file_surfer = self.system_prompt_file_surfer_template.format(date_today=datetime.now().strftime("%Y-%m-%d"))

src/magentic_ui/agents/_coder.py:490

• [nitpick] Consider consolidating the datetime string formatting into a common helper function to avoid redundancy between agent implementations.

system_prompt_coder = self.system_prompt_coder_template.format(date_today=datetime.now().strftime("%Y-%m-%d"))

[husseinmozannar]

Thank you so much for this contribution! All looks good, will merge and will be included in the 0.0.4 release