cometchat-android-v5-calls-sdk

Ground truth: com.cometchat:calls-sdk-android:5.0.4 + catalog android-calls-v5.json (the CLOSED list, javap-verified on the installed AAR). Docs: /calls/android/** = v5 · Docs MCP. Fetch builder options, callback lists and filters from the docs (references/docs-map.md) — never memory. ⚠️ Where docs and AAR disagree, the AAR wins (drift list in references/pitfalls.md). APPEND to the user's app — additive wiring only (RULES.md). HEADLESS path (no UI Kit); for the prebuilt call UI use cometchat-android-v6-calls.

Companion skills (read first)

• Standalone/headless entry — owns its own artifact (the Calls SDK), no -core sibling.
• 1:1 RINGING only also drives the Chat SDK (com.cometchat:chat-sdk-android:5.0.5) for signaling — references/ringing.md; deeper Chat-SDK usage: cometchat-android-v5-sdk.
• Prefer the UI Kit? Chat + a prebuilt call UI ⇒ cometchat-android-v6-core + cometchat-android-v6-calls, not this skill.

Use this skill when

"add calling from scratch / without the UI Kit", "standalone voice/video on Android", "build my own call screen", "headless calls SDK", "meeting room join by session id", "one-on-one ringing call". Precondition: the caller chose the from-scratch / standalone path (prebuilt call UI ⇒ see Companion skills).