complex-join-helper
Complex Join Helper - Auto-activating skill for Data Analytics. Triggers on: complex join helper, complex join helper Part of the Data Analytics skill category.
34
0%
Does it follow best practices?
Impact
100%
1.00xAverage score across 3 eval scenarios
Passed
No known issues
Optimize this skill with Tessl
npx tessl skill review --optimize ./planned-skills/generated/12-data-analytics/complex-join-helper/SKILL.mdQuality
Discovery
0%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 description is essentially a template placeholder with no substantive content. It restates the skill name, duplicates the trigger term, and provides no information about what the skill actually does, what technologies or data formats it works with, or when it should be selected. It would be nearly impossible for Claude to correctly choose this skill from a list of alternatives.
Suggestions
Add specific concrete actions the skill performs, e.g., 'Constructs complex SQL joins including multi-table joins, self-joins, cross joins, and conditional join logic for data analysis queries.'
Add an explicit 'Use when...' clause with natural trigger terms, e.g., 'Use when the user needs help writing SQL joins across multiple tables, debugging join conditions, optimizing join performance, or merging datasets with complex relationships.'
Include natural keywords users would actually say, such as 'SQL', 'JOIN', 'LEFT JOIN', 'INNER JOIN', 'merge tables', 'multi-table query', 'foreign key', 'relational data'.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | The description says 'Complex Join Helper' but never describes what concrete actions it performs. There are no specific capabilities listed—no mention of what types of joins, what data sources, or what outputs it produces. | 1 / 3 |
Completeness | The description fails to answer both 'what does this do' and 'when should Claude use it.' There is no explicit 'Use when...' clause, and the 'what' is essentially just the skill name restated with no elaboration. | 1 / 3 |
Trigger Term Quality | The only trigger terms listed are 'complex join helper' repeated twice, which is not a natural phrase users would say. Missing natural terms like 'SQL join', 'multi-table query', 'LEFT JOIN', 'merge tables', 'join conditions', etc. | 1 / 3 |
Distinctiveness Conflict Risk | The description is too vague to be distinctive. 'Data Analytics' is extremely broad, and 'complex join helper' without specifics could overlap with any SQL, database, or data manipulation skill. | 1 / 3 |
Total | 4 / 12 Passed |
Implementation
0%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill is an empty template/placeholder with no substantive content. It contains no actual guidance on complex SQL joins, no code examples, no workflows, and no actionable information. Every section restates the skill name without teaching Claude anything it doesn't already know.
Suggestions
Add concrete, executable SQL examples demonstrating complex join patterns (e.g., self-joins, multi-table joins with subqueries, LATERAL joins, anti-joins) with sample schemas and expected outputs.
Define a clear workflow for approaching complex join problems: analyze requirements → identify tables/keys → choose join strategy → write query → validate results with row count checks or sample verification.
Remove all boilerplate sections (Purpose, When to Use, Example Triggers, Capabilities) that merely restate the skill name, and replace with actionable content like common pitfalls (Cartesian products, NULL handling in outer joins) and debugging strategies.
Add references to supporting files for advanced topics (e.g., WINDOW_FUNCTIONS.md, PERFORMANCE_TUNING.md) or inline examples for different SQL dialects if the skill is meant to cover multiple databases.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The content is entirely filler and boilerplate. It explains nothing Claude doesn't already know, repeats the phrase 'complex join helper' excessively, and provides zero domain-specific information about SQL joins, data analytics, or any concrete technique. | 1 / 3 |
Actionability | There is no concrete code, no SQL examples, no commands, and no executable guidance whatsoever. Every section is vague and abstract — 'Provides step-by-step guidance' without actually providing any steps. | 1 / 3 |
Workflow Clarity | No workflow, sequence, or process is defined. There are no steps to follow, no validation checkpoints, and no actual procedure for performing complex joins or any data analytics task. | 1 / 3 |
Progressive Disclosure | The content is a monolithic block of placeholder text with no references to supporting files, no structured navigation, and no meaningful organization of content across sections. No bundle files exist to support it either. | 1 / 3 |
Total | 4 / 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 | |
- Commit
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- Reviewed
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