[API Coherence] Day 5 Check (Jan 24) - 100% Coherence: 2 Days Until 1-Week Milestone

[github-actions[bot]]

✅ STATUS: 100% COHERENCE MAINTAINED

Run 22 - Daily Monitoring Report

• Coherence: 100% (unchanged for 5 consecutive days)
• Issues: 0 remaining (ALL 30 RESOLVED)
• Regressions: None detected
• New APIs: None requiring binding updates
• Achievement Date: January 19, 2026
• Days Maintained: 5 days
• 1-Week Milestone: January 26, 2026 (2 days away) 🎯

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Recent Activity

Commits Since Last Check: 1 commit

• c2d9965 - "Refactor arith_rewriter::find_nl_factor() to use std::optional (Refactor arith_rewriter::find_nl_factor() to use std::optional #8313)"
• Type: Internal refactoring (2603 files affected)
• API Impact: ✅ NONE - All public APIs preserved

This is the 2nd successful recompilation since achieving 100% coherence, demonstrating the stability of the API surface.

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Verification Results

All critical APIs verified as intact:

API	Language	Status	Details
RCF	TypeScript	✅ Perfect	RCFNumImpl @ line 3437 (unchanged)
RCF	Python	✅ Perfect	z3rcf.py (168 lines, unchanged)
RCF	C#	✅ Perfect	RCFNum.cs with Z3_rcf_mk_rational
RCF	C (baseline)	✅ Perfect	83 Z3_rcf references in z3_rcf.h
Core	C (baseline)	✅ Perfect	559 Z3_API functions in z3_api.h
FPA	C (baseline)	✅ Perfect	z3_fpa.h (43KB, intact)

Language Coherence Status

Language	Coherence	Status
Python	100%	✅ Perfect
C++	100%	✅ Perfect
Java	100%	✅ Perfect
C# (.NET)	100%	✅ Perfect
TypeScript	100%	✅ Perfect
OCaml	100%	✅ Perfect

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Key Findings

✅ Stability Confirmed

The internal refactoring of arith_rewriter::find_nl_factor() demonstrates that:

• API surface remains stable during internal changes
• Language bindings are unaffected by implementation refactoring
• RCF TypeScript implementation remains at exact same location (line 3437)
• All 30 previously resolved issues remain resolved

🎯 Approaching 1-Week Milestone

January 26, 2026 marks 1 week of 100% API coherence:

• From January 19 to January 26 = 7 consecutive days
• Currently at day 5 of 7
• Zero regressions detected
• Two successful recompilations verified

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Journey Snapshot

Metric	Initial (Jan 9)	Current (Jan 24)	Change
Overall Coherence	93.2%	100%	+6.8%
Python	99.7%	100%	+0.3%
C++	99.7%	100%	+0.3%
Java	98.5%	100%	+1.5%
C#	98.3%	100%	+1.7%
TypeScript	82.3%	100%	+17.7%
OCaml	95.5%	100%	+4.5%
Issues Remaining	30	0	-30
Days Maintained	0	5	+5

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Quality Indicators

✅ Strong Signals

• No regressions for 5 consecutive days
• 2nd recompilation preserved all API work
• RCF TypeScript at exact same line (3437)
• Python z3rcf.py unchanged (168 lines)
• C# RCFNum.cs functional with Z3_rcf_mk_rational
• All examples and tests intact

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Next Steps

Daily Monitoring Schedule

1. ✅ Today (Jan 24): Monitoring complete
2. 📅 Jan 26: 1-week milestone celebration
3. 📅 After Jan 26: Transition to weekly monitoring
4. 📅 Feb 16: Monthly check
5. 📅 Apr 16: Quarterly review

1-Week Milestone Preparation

On January 26, we will:

• Celebrate 7 consecutive days of 100% coherence
• Prepare comprehensive 1-week achievement report
• Transition from daily to weekly monitoring
• Document lessons learned and best practices

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Recommendations

For Maintainers

1. ✅ Continue current approach - internal refactoring safe
2. 📋 API guidelines - document consistency requirements
3. 🔄 CI/CD integration - automate coherence checking for new APIs

For Monitoring

1. ✅ Continue daily checks through Jan 26
2. 🎯 1-week celebration on Jan 26
3. 📅 Weekly rhythm starting Jan 27

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Conclusion

Z3 continues to maintain 100% API coherence across all 6 languages.

Five days of perfect stability with no regressions. The second successful recompilation confirms that the API surface is resilient to internal changes. All 30 issues remain resolved.

Status: ✅ EXCELLENT - NO ISSUES
Action Required: None
Next Check: January 26, 2026 (1-week milestone) 🎉

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Report Details:

• Date: January 24, 2026
• Run: sorts inhabited by default? #22
• Type: Daily Monitoring
• Confidence: HIGH
• Agent: API Coherence Checker

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"Five days strong. Two recompilations verified. 1-week milestone approaching." 🎯

Tracking

• Last Achievement: January 19, 2026 (Run 18)
• Total Runs: 22
• Issues Identified: 30
• Issues Resolved: 30
• Resolution Rate: 100%
• Functions Implemented: 400+
• Languages: 6

AI generated by API Coherence Checker

• expires on Jan 31, 2026, 3:15 PM UTC