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".
68
62%
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 phrase guidance, 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 specific capabilities like connection management, message broadcasting, or room handling.
Suggestions
Add more specific concrete actions such as 'handle WebSocket connections, broadcast messages, manage rooms/channels, implement heartbeat/ping-pong' 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 | The description names the domain (WebSocket servers) and a general action ('Build scalable WebSocket servers'), but does not list multiple specific concrete actions like handling connections, broadcasting messages, managing rooms, or authentication. | 2 / 3 |
Completeness | Clearly answers both 'what' (build scalable WebSocket servers for real-time bidirectional communication) and 'when' (explicit 'Use when' clause and 'Trigger with phrases like' providing concrete trigger guidance). | 3 / 3 |
Trigger Term Quality | Includes natural trigger phrases users would say: 'build WebSocket server', 'add real-time API', 'implement WebSocket', plus terms like 'real-time bidirectional communication'. Good coverage of how users would phrase requests. | 3 / 3 |
Distinctiveness Conflict Risk | WebSocket servers are a clear niche with distinct triggers ('WebSocket', 'real-time API', 'bidirectional communication') that are unlikely to conflict with other skills like REST API or general server-building skills. | 3 / 3 |
Total | 11 / 12 Passed |
Implementation
35%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill provides a well-structured outline for building WebSocket servers with good section organization and error handling tables, but critically lacks any executable code examples. The instructions read as a high-level architecture guide rather than actionable implementation guidance, and the referenced bundle files don't exist, leaving the skill incomplete.
Suggestions
Add concrete, executable code examples for at least the core steps: server setup with upgrade handling, connection authentication, and message protocol handling (e.g., a working ws or Socket.IO server snippet).
Include validation checkpoints between steps, such as 'Test WebSocket upgrade with wscat before proceeding' or 'Verify authentication rejects invalid tokens' to create feedback loops.
Create the referenced bundle files (implementation.md, errors.md, examples.md) or remove the references if they don't exist, as broken references reduce trust in the skill.
Replace the prose-only Examples section with at least one minimal working example showing a complete message flow (connect → authenticate → subscribe → send → receive).
| 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 general infrastructure knowledge Claude already possesses. The examples section describes use cases at a high level without providing executable code, adding tokens without proportional value. | 2 / 3 |
Actionability | Despite listing 9 steps, the instructions are entirely descriptive 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 examples section also only describes scenarios in prose without any implementation. | 1 / 3 |
Workflow Clarity | The 9 steps are logically sequenced and cover the full lifecycle, but there are no validation checkpoints between steps. Step 9 mentions tests but there's no feedback loop for verifying intermediate results (e.g., confirming the upgrade works before building the registry, or validating the message protocol before adding Redis scaling). | 2 / 3 |
Progressive Disclosure | The skill references three external files (implementation.md, errors.md, examples.md) which is good structure, but no bundle files are provided, meaning those references lead nowhere. The main file itself is moderately well-organized with clear sections, but the lack of actual supporting files undermines the progressive disclosure pattern. | 2 / 3 |
Total | 7 / 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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