sinch-voice-api
Build voice apps with Sinch Voice REST API. Use for phone calls, text-to-speech (TTS), IVR menus, DTMF input, conference calling, call recording, call forwarding, answering machine detection (AMD), SIP routing, WebSocket audio streaming, and SVAML call control.
88
86%
Does it follow best practices?
Impact
Pending
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 strong skill description that clearly identifies the technology (Sinch Voice REST API), lists numerous specific capabilities, and includes a 'Use for' clause with extensive trigger terms. The description is concise yet comprehensive, covering a wide range of voice-related features with both acronyms and full terms for discoverability.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists many specific concrete actions: phone calls, text-to-speech, IVR menus, DTMF input, conference calling, call recording, call forwarding, answering machine detection, SIP routing, WebSocket audio streaming, and SVAML call control. | 3 / 3 |
Completeness | Clearly answers both what ('Build voice apps with Sinch Voice REST API') and when ('Use for phone calls, text-to-speech, IVR menus, DTMF input...'). The 'Use for' clause serves as an explicit trigger guidance. | 3 / 3 |
Trigger Term Quality | Excellent coverage of natural terms users would say: 'phone calls', 'text-to-speech', 'TTS', 'IVR', 'DTMF', 'conference calling', 'call recording', 'call forwarding', 'SIP', 'WebSocket', 'voice apps', 'Sinch'. Includes both acronyms and expanded forms (e.g., TTS, AMD). | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with the specific mention of 'Sinch Voice REST API' and domain-specific terms like 'SVAML call control', 'SIP routing', and 'answering machine detection'. Very unlikely to conflict with other skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
72%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a comprehensive and well-organized API skill that excels at actionability with executable examples across multiple formats (curl, Node.js SDK, SVAML JSON) and progressive disclosure with clear references to detailed sub-documents. The main weaknesses are moderate verbosity (the exhaustive tables and 15 gotchas could be trimmed or moved to reference files) and the lack of explicit validation workflows for multi-step voice app development processes.
Suggestions
Consider moving the full REST endpoints table and some of the 15 gotchas to a reference file, keeping only the most critical items (e.g., top 5-6 gotchas) inline to improve conciseness.
Add an explicit validation workflow for setting up a voice app — e.g., a numbered sequence like: 1) Configure callback URL, 2) Verify it's reachable with a test request, 3) Make a test callout, 4) Check call status via GET /calls/id/{callId}, 5) Review DiCE callback for completion.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is generally well-structured but includes some content that could be tightened — the full REST endpoint table, the exhaustive gotchas list (15 items), and the complete regional base URL table add bulk. However, most of this is domain-specific knowledge Claude wouldn't inherently know, so it's not explaining obvious concepts. | 2 / 3 |
Actionability | Provides fully executable curl commands, Node.js SDK code, complete SVAML JSON examples for IVR/conference/AMD patterns, and ready-to-run CLI scripts with exact invocation syntax. The first API call example is copy-paste ready with clear placeholders. | 3 / 3 |
Workflow Clarity | The agent instructions provide a clear initial workflow (ask user about approach/language, then fetch references), and the gotchas section covers important ordering constraints. However, there's no explicit validation/verification workflow for building voice apps — no 'test your callback URL is reachable' checkpoint, no error recovery flow for failed calls, and the multi-step callback chaining (ICE→ACE→PIE) lacks a sequenced workflow with checkpoints. | 2 / 3 |
Progressive Disclosure | Excellent progressive disclosure with a clear overview in the main file, well-signaled one-level-deep references to bundled files (references/svaml.md, references/callbacks.md, references/examples/), external SDK references, and a separate authentication skill. Navigation is easy with inline links at point of need. | 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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