[prompt-analysis] Copilot PR Prompt Analysis - 2026-10-15

[github-actions[bot]]

🤖 Copilot PR Prompt Pattern Analysis - 2026-10-15

Summary

Analysis Period: Last 30 days
Total PRs: 595 | Merged: 500 (84.0%) | Closed: 94 (15.8%) | Open: 1

Prompt Categories and Success Rates

Categories are keyword-matched on PR titles and may overlap.

Category	Total	Merged	Success Rate (merged / completed)
Bug Fix	102	90	88.2% (90/101)
Feature Addition	99	84	84.8%
Refactoring	17	14	82.4%
Documentation	31	26	83.9%
Testing	22	18	81.8%

Prompt Analysis

✅ Successful Prompt Patterns

• Average prompt length: ~166 words (merged)
• Fix-style prompts (failing jobs, specific errors) merge most often.
• Example: PR Add Go Fan bounded-research A/B experiment #68936 Add Go Fan bounded-research A/B experiment → Merged
• Example: PR Default optional target repository before MCP gateway startup #68882 Default optional target repository before MCP gateway startup → Merged

❌ Unsuccessful Prompt Patterns

• Average prompt length: ~200 words (closed)
• Closed PRs often include duplicates of the same task (e.g. Define optional target repository before MCP Gateway startup #68907 vs Default optional target repository before MCP gateway startup #68882 on the optional target repository) and broad feature or docs work.
• Example: PR Add outcome clustering to workflow audits #68924 Add outcome clustering to workflow audits → Closed
• Example: PR Document native-video publication blockers and publisher requirements #68727 Document native-video publication blockers and publisher requirements → Closed

Key Insights

• Length: closed-PR prompts are ~20% longer than merged ones (200 vs 166 words); conciseness helps.
• Bug fixes have the highest merge rate (88%); refactor, docs and testing are slightly lower, but their samples are small.
• File references: prompts naming specific files or paths merged 86.6% (103/119) vs 84.0% (397/475) without. The gap is small, so treat it as weak evidence.

Recommendations

1. DO: Give a concrete failure (run ID, error) for fix tasks.
2. DO: Keep prompts focused on one change and name the files involved.
3. AVOID: Launching overlapping or duplicate tasks for the same problem, and very long multi-goal prompts.

Historical Trends

Date	Merged	Closed	Success Rate
2026-10-15	500	94	84.2%
2026-10-12	472	90	84.0%

Trend: Stable at about 84%.

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Generated by Copilot PR Prompt Analysis (Run: 38804170447)

Generated by 🔍 Copilot PR Prompt Pattern Analysis · copilot · auto · 13.4 AIC · ⌖ 0.698 AIC · ⊞ 10.9K · ◷

• expires on Oct 16, 2026, 12:47 PM UTC-08:00