feat(mcp): make config optional in generate_explore_link

[msyavuz]

SUMMARY

generate_explore_link required config as a mandatory field, forcing LLMs to construct a chart config even when the user just wants to open a dataset in Explore.

This PR makes config optional. When omitted, the tool validates the dataset exists and returns a default explore URL (/explore/?datasource_type=table&datasource_id=<id>) that opens the dataset in Superset with no preconfigured chart.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A — backend-only MCP tool change, no UI.

TESTING INSTRUCTIONS

Unit tests:

pytest tests/unit_tests/mcp_service/explore/tool/test_generate_explore_link.py

Manual (via MCP client):

• Call generate_explore_link with {"dataset_id": 1} — should return a dataset explore URL with no form_data.
• Call with {"dataset_id": 99999} (nonexistent) — should return a dataset-not-found error.
• Call with a valid config — should behave exactly as before.

ADDITIONAL INFORMATION

• Has associated issue: No
• Required feature flags: None
• Changes UI: No — backend-only
• Includes DB Migration: No
• Introduces new feature or API: No — relaxes an existing required field
• Removes existing feature or API: No — backwards-compatible (existing callers with config are unaffected)

[bito-code-review]

Code Review Agent Run #6cde5c

Actionable Suggestions - 0

Review Details

• Files reviewed - 3 · Commit Range: f2d4e9c..f2d4e9c

  • superset/mcp_service/chart/schemas.py
  • superset/mcp_service/explore/tool/generate_explore_link.py
  • tests/unit_tests/mcp_service/explore/tool/test_generate_explore_link.py
• Files skipped - 0
• Tools

  • Whispers (Secret Scanner) - ✔︎ Successful
  • Detect-secrets (Secret Scanner) - ✔︎ Successful
  • MyPy (Static Code Analysis) - ✔︎ Successful
  • Astral Ruff (Static Code Analysis) - ✔︎ Successful

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Codecov Report

❌ Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.69%. Comparing base (2f5fcc2) to head (7b2973b).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../mcp_service/explore/tool/generate_explore_link.py	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #39559      +/-   ##
==========================================
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  Branches    32175    31504     -671     
==========================================
- Hits        89045    87299    -1746     
- Misses      48146    48221      +75     
  Partials     1532     1532              

Flag	Coverage Δ
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mysql	58.92% <10.00%> (-0.01%)	⬇️
postgres	59.01% <10.00%> (-0.01%)	⬇️
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python	60.57% <10.00%> (-0.01%)	⬇️
sqlite	58.64% <10.00%> (-0.01%)	⬇️
unit	100.00% <ø> (ø)

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[EnxDev]

LGTM!

[bito-code-review]

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