sinch-in-app-calling
Integrate Sinch In-App Voice and Video SDK for real-time calling in Android, iOS, or JavaScript apps. Use when the user mentions In-App Calling, VoIP integration, WebRTC with Sinch, app-to-phone calling, video calling, or building voice/video features in a mobile or web app.
69
85%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Passed
No known issues
Quality
Discovery
100%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is a well-crafted skill description that clearly identifies the specific technology (Sinch In-App Voice and Video SDK), the platforms supported, and provides an explicit 'Use when...' clause with a comprehensive set of natural trigger terms. It follows the third-person voice convention and is concise without being vague.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple concrete actions and capabilities: 'Integrate Sinch In-App Voice and Video SDK', 'real-time calling', specifies platforms (Android, iOS, JavaScript apps), and mentions specific use cases like app-to-phone calling and video calling. | 3 / 3 |
Completeness | Clearly answers both 'what' (integrate Sinch In-App Voice and Video SDK for real-time calling across platforms) and 'when' (explicit 'Use when...' clause listing multiple trigger scenarios like VoIP integration, WebRTC with Sinch, app-to-phone calling, etc.). | 3 / 3 |
Trigger Term Quality | Excellent coverage of natural terms users would say: 'In-App Calling', 'VoIP integration', 'WebRTC with Sinch', 'app-to-phone calling', 'video calling', 'voice/video features', 'mobile or web app'. These are terms developers would naturally use when seeking this functionality. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive due to the specific vendor (Sinch), specific SDK type (In-App Voice and Video), and specific technology references (WebRTC, VoIP). Very unlikely to conflict with other skills unless there are multiple Sinch-related skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
70%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a well-structured skill with excellent progressive disclosure and workflow clarity, effectively guiding Claude through a multi-platform integration process. Its main weaknesses are moderate verbosity in the Key Concepts section (explaining things Claude can infer) and limited inline executable code — most actionable code is deferred to reference files, leaving the main skill somewhat abstract in its Common Patterns section.
Suggestions
Remove or significantly trim the 'Key Concepts' section — most definitions (User Identity, Call Types, JWT Authentication) are self-evident from context and waste tokens.
Add at least one minimal executable code snippet per platform in the 'Common Patterns' section (e.g., a complete app-to-app call example) rather than prose descriptions like 'call callUser("recipient-id")'.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | Generally efficient but the 'Key Concepts' section explains things Claude likely already knows or could infer from context (e.g., what a 'User Identity' is, what 'Call Types' means). The troubleshooting table and endpoint table earn their place, but the key concepts section adds moderate bloat. | 2 / 3 |
Actionability | The integration workflow provides a clear process and the ICE callback JSON is concrete, but actual SDK code is deferred to reference files rather than shown inline. The 'Common Patterns' section describes actions in prose ('call callUser("recipient-id")') rather than providing executable code snippets with imports and setup context. | 2 / 3 |
Workflow Clarity | The integration workflow is clearly sequenced with 5 numbered steps, includes decision points (platform detection, auth approach, call types), and has explicit guidance to 'confirm each step is in place before moving to the next.' The Phone-to-App flow has clear prerequisites listed. The troubleshooting table serves as a validation/error-recovery mechanism. | 3 / 3 |
Progressive Disclosure | Excellent structure with a concise overview, clear one-level-deep references to platform-specific files (android.md, ios.md, js.md, SDK init references), and well-organized sections. Content is appropriately split between the main skill and reference files, with clear navigation signals. | 3 / 3 |
Total | 10 / 12 Passed |
Validation
90%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 10 / 11 Passed
Validation for skill structure
| Criteria | Description | Result |
|---|---|---|
metadata_field | 'metadata' should map string keys to string values | Warning |
Total | 10 / 11 Passed | |
- Repository
- sinch/skills
- Commit
474538d
- Reviewed
Table of Contents
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