building-websocket-server
Build scalable WebSocket servers for real-time bidirectional communication. Use when enabling real-time bidirectional communication. Trigger with phrases like "build WebSocket server", "add real-time API", or "implement WebSocket".
71
66%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./plugins/api-development/websocket-server-builder/skills/building-websocket-server/SKILL.mdQuality
Discovery
89%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
The description is well-structured with explicit 'Use when' and 'Trigger with' clauses, making it strong on completeness and distinctiveness. Its main weakness is the lack of specific concrete actions beyond the general 'build scalable WebSocket servers' — it would benefit from listing particular capabilities like connection management, message broadcasting, or authentication handling.
Suggestions
Add more specific concrete actions such as 'manage connections, broadcast messages, handle rooms/channels, implement heartbeats' to improve specificity.
Consider adding file extension or protocol triggers like 'ws://', 'wss://', or framework-specific terms like 'Socket.IO' if applicable.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Names the domain (WebSocket servers) and a general action (build scalable servers for real-time bidirectional communication), but does not list multiple specific concrete actions like handling connections, broadcasting messages, managing rooms, or implementing heartbeats. | 2 / 3 |
Completeness | Explicitly answers both 'what' (build scalable WebSocket servers for real-time bidirectional communication) and 'when' (use when enabling real-time bidirectional communication, with explicit trigger phrases). The 'Use when' and 'Trigger with' clauses are present. | 3 / 3 |
Trigger Term Quality | Includes natural trigger phrases users would say: 'build WebSocket server', 'add real-time API', 'implement WebSocket'. These are realistic phrases a user would type, and 'WebSocket' and 'real-time' are strong domain-specific keywords. | 3 / 3 |
Distinctiveness Conflict Risk | WebSocket servers are a clear niche distinct from general HTTP APIs, REST endpoints, or other communication patterns. The trigger terms 'WebSocket' and 'real-time API' are specific enough to avoid conflicts with other skills. | 3 / 3 |
Total | 11 / 12 Passed |
Implementation
42%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill is well-structured with good progressive disclosure and a logical workflow sequence, but critically lacks any executable code or concrete implementation examples. It reads more like a project specification or architecture document than an actionable skill that Claude can follow to produce working code. The heavy reliance on reference files for actual implementation details means the main skill body provides little direct value.
Suggestions
Add at least one complete, executable code example in the Instructions section (e.g., a minimal WebSocket server with authentication and heartbeat) rather than deferring all implementation to reference files.
Replace the abstract example descriptions (chat, dashboard, collaborative editing) with concrete code snippets showing the message protocol and at least one handler implementation.
Add explicit validation checkpoints between critical steps, such as 'Test WebSocket upgrade works before adding authentication' and 'Verify single-server messaging before configuring Redis adapter'.
Trim the prerequisites section to only non-obvious requirements (e.g., load balancer sticky session config) since Claude already knows about Node.js versions and common libraries.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The content is moderately efficient but includes unnecessary preamble in the overview that restates the description, and the prerequisites section lists things Claude would already know to check. The examples section describes use cases at a high level without adding actionable value. | 2 / 3 |
Actionability | Despite listing 9 steps, the instructions are entirely abstract descriptions with no executable code, no concrete commands, and no copy-paste ready examples. Every step says what to do conceptually but never shows how with actual code. The real implementation is deferred to a reference file. | 1 / 3 |
Workflow Clarity | Steps are sequenced logically from setup through testing, but there are no validation checkpoints between steps. Step 9 mentions tests but there's no explicit 'validate before proceeding' feedback loop, which is important for a multi-step server setup involving authentication and scaling configuration. | 2 / 3 |
Progressive Disclosure | The skill provides a clear overview with well-signaled one-level-deep references to implementation.md, errors.md, and examples.md. Content is appropriately split between the main skill file and reference documents, with clear navigation signals. | 3 / 3 |
Total | 8 / 12 Passed |
Validation
81%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 9 / 11 Passed
Validation for skill structure
| Criteria | Description | Result |
|---|---|---|
allowed_tools_field | 'allowed-tools' contains unusual tool name(s) | Warning |
frontmatter_unknown_keys | Unknown frontmatter key(s) found; consider removing or moving to metadata | Warning |
Total | 9 / 11 Passed | |
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