CtrlK
BlogDocsLog inGet started
Tessl Logo

sinch-partnerships-ecosystems/sinch-skills

Official Sinch API skills for AI coding agents — SMS, Voice, Verification, Numbers, Mailgun email, and more.

71

Quality

88%

Does it follow best practices?

Impact

No eval scenarios have been run

SecuritybySnyk

Advisory

Suggest reviewing before use

This plugin was archived by the owner on Jun 4, 2026

Reason: we moved this to another workspace

Overview
Quality
Evals
Security
Files

Quality

Content

77%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This is a solid, actionable skill with clear workflows and concrete examples. Its main weakness is length — it tries to serve as both a quick-start guide and a comprehensive reference, which hurts conciseness and progressive disclosure. The actionability and workflow clarity are strong, with executable examples, decision trees, and explicit checklists.

Suggestions

Move the SDK installation table, Maven dependency details, and engagement data specifics into a separate reference file to reduce the main skill's token footprint.

Remove filler phrases like 'Ensure that authentication headers are properly set when making API calls' — the curl example already demonstrates this.

DimensionReasoningScore

Conciseness

The skill is mostly efficient but includes some unnecessary verbosity — e.g., 'Ensure that authentication headers are properly set when making API calls' is filler, the SDK table and Maven dependency section add bulk that could be in a reference file, and some phrasing could be tightened. However, most content is informational and relevant.

2 / 3

Actionability

Provides fully executable curl examples with expected JSON responses, concrete endpoint paths with HTTP methods, specific query parameters, CSV format requirements, and a clear checklist for bulk validation. The guidance is copy-paste ready and specific enough to act on immediately.

3 / 3

Workflow Clarity

The 'Deciding which approach to use' section clearly sequences decision-making, the bulk validation checklist includes explicit steps with polling and download verification, and the preview-to-bulk promotion workflow has a clear lifecycle (preview_processing → preview_complete → PUT to promote). Validation checkpoints are present (poll until status is 'uploaded', check result + risk independently).

3 / 3

Progressive Disclosure

The skill has good structure with clear sections and links to external documentation, but it's quite long with inline content (SDK tables, Maven dependency, full response schemas, engagement data details) that could be split into separate reference files. The Links section is well-organized, but the main file tries to be both overview and reference.

2 / 3

Total

10

/

12

Passed

Description

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 specific tool (Mailgun Validate API), lists concrete capabilities, and provides an explicit 'Use when...' clause with multiple natural trigger terms. It is well-scoped to a distinct niche, making it easy for Claude to select appropriately from a large skill set.

DimensionReasoningScore

Specificity

Lists multiple specific concrete actions: validating email addresses, checking email deliverability, running bulk validation jobs, previewing list health, and cleaning an email list. Also specifies the concrete tool (Mailgun Validate API).

3 / 3

Completeness

Clearly answers both 'what' (build with Mailgun Validate API for email verification and list hygiene) and 'when' (explicit 'Use when...' clause listing five specific trigger scenarios).

3 / 3

Trigger Term Quality

Includes strong natural keywords users would say: 'email verification', 'validating email addresses', 'email deliverability', 'bulk validation', 'list health', 'cleaning an email list', 'list hygiene', and 'Mailgun'. These cover a wide range of natural user phrasings.

3 / 3

Distinctiveness Conflict Risk

Highly distinctive due to the specific mention of 'Mailgun Validate API' and the focused domain of email validation/deliverability/list hygiene. Unlikely to conflict with general email-sending or other API skills.

3 / 3

Total

12

/

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.

Validation10 / 11 Passed

Validation for skill structure

CriteriaDescriptionResult

metadata_field

'metadata' should map string keys to string values

Warning

Total

10

/

11

Passed

Reviewed

Table of Contents