सार्वधातुकार्धधातुकयोः

Operational rule vidhi

When followed by an सार्वधातुक or an आर्धधातुक प्रत्यय, an इगन्त अङ्ग gets a गुणादेश.

Word by word (padaccheda)

Right context - saptamī · dvivacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The गुण is substituted for the final इक् vowel of a अङ्ग (stem) before the affixes called सार्वधातुक and आर्धधातुक -- तिङ्शित्सार्वधातुकम् 3.4.113 etc.
As तरति, नयति, भवति, कर्तृ, चेतृ, स्तोतृ ॥ Why sarvadhatuka and ardhadhatuka affixes only? Observe अग्नित्वम् अग्निकाम्यति ॥ For had the sutra been सङि then the rule would have applied to affixes like सन् काम्यच &c which go to form Denominative verbs. सङ् includes all affixes beginning with सन् and ending with महिङ् ॥ If the sutra had been प्रत्यये, then the rule would have applied to the affixes like त्वम् &c. To exclude these cases, the two words sarvadhatuka and ardhadhatuka are used. For exceptions See 1.1.4, 1.1.5, 1.1.6.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.