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mps-lang-core-xml

Use when authoring XML documents as MPS root nodes or building XML-generating generator templates with jetbrains.mps.core.xml — covers XmlFile, XmlDocument, prolog (XML declaration, DOCTYPE, processing instructions, comments), elements, attributes, CDATA, entity references, and macro attachment via the smodelAttribute role for templates that emit XML output.

70

Quality

86%

Does it follow best practices?

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SecuritybySnyk

Passed

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SKILL.md
Quality
Evals
Security

Quality

Content

87%

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

A lean, well-organized reference skill that delegates executable detail to verified one-level-deep references and gives concrete named-concept guidance. Its only gap is the workflow's validation step, which lacks an explicit fix-and-revalidate feedback loop for XML manipulation.

Suggestions

Expand the Common-Path Workflow's validation step into an explicit feedback loop, e.g., '6. Validate with mps_mcp_check_root_node_problems; if problems are reported, fix the cited node roles/properties and re-validate before proceeding.'

Add a one-line error-recovery note in the Critical Directives (e.g., 'If mps_mcp_check_root_node_problems reports a wrong-role or missing-cardinality error, consult references/rules-and-pitfalls.md, fix, and re-validate.') to close the validation feedback loop.

Consider noting in step 6 what to inspect on validation failure (rootElement cardinality, smodelAttribute macro placement, property name asymmetry) so the retry path is concrete rather than implicit.

DimensionReasoningScore

Conciseness

The body is lean and assumes Claude's competence: directives are terse (e.g., 'XmlProlog is optional (0..1). Omit it entirely when no prolog is needed.') with no padding or explanation of concepts Claude already knows, matching the anchor-3 'every token earns its place.'

3 / 3

Actionability

It gives concrete, specific guidance — named roles (document, rootElement, content, smodelAttribute), named concepts (XmlFile, PropertyMacro, LoopMacro), and an exact validation command (mps_mcp_check_root_node_problems) — with executable JSON blueprints clearly delegated one level deep to json-blueprints.md, matching anchor 3 for a reference skill rather than the abstract/pseudocode anchors.

3 / 3

Workflow Clarity

The six steps are clearly sequenced with an explicit validation step (step 6: mps_mcp_check_root_node_problems), but for XML/document manipulation the rubric requires an explicit error-recovery feedback loop ('if errors: fix and re-validate'), which is only implicit here, capping the score at anchor 2.

2 / 3

Progressive Disclosure

The body is a concise overview with a well-structured Reference Index; each reference is one level deep, clearly signaled with 'open when…' guidance, and all four referenced files (concept-catalog.md, json-blueprints.md, rules-and-pitfalls.md, language-dependencies.md) exist, matching the anchor-3 'clear overview with well-signaled one-level-deep references.'

3 / 3

Total

11

/

12

Passed

Description

85%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong, highly specific description that clearly states both capability and an explicit 'Use when' trigger. Its main weakness is trigger-term quality: the language leans on MPS-internal jargon rather than the natural phrases a user would say.

Suggestions

Add natural trigger phrasings a user would actually say (e.g., 'Use when generating or emitting XML output from an MPS model,' 'Use when you need to author XML documents or build XML generator templates') alongside the current jargon-heavy terms.

Consider adding common variations users might invoke with, such as 'emit XML,' 'produce XML output,' or 'serialize to XML,' to broaden trigger-term coverage without losing specificity.

Move or mirror the most user-facing verbs ('author XML,' 'generate XML,' 'emit XML output') to the front of the description so the natural trigger terms precede the technical concept enumeration.

DimensionReasoningScore

Specificity

Lists multiple concrete actions and objects: 'authoring XML documents as MPS root nodes,' 'building XML-generating generator templates,' plus an enumerated cover set (XmlFile, XmlDocument, prolog, CDATA, entity references, macro attachment via smodelAttribute). It is more comprehensive than the anchor-2 'names domain and some actions,' matching anchor 3.

3 / 3

Completeness

It explicitly answers both what (the enumerated XML constructs and macro attachment) and when (the 'Use when authoring XML documents… or building XML-generating generator templates' clause), matching the anchor-3 'clearly answers both what AND when with explicit triggers.'

3 / 3

Trigger Term Quality

It opens with an explicit 'Use when…' trigger and includes natural terms ('XML documents,' 'XML,' 'generator templates'), but coverage is jargon-heavy ('MPS root nodes,' 'jetbrains.mps.core.xml,' 'smodelAttribute role') and lacks common natural variations a user would actually say, fitting anchor 2 rather than the broad anchor-3 coverage.

2 / 3

Distinctiveness Conflict Risk

The niche is highly specific (MPS root nodes, jetbrains.mps.core.xml, XML-generating generator templates, smodelAttribute role), making it clearly distinguishable and unlikely to trigger for a generic XML/file skill, matching anchor 3.

3 / 3

Total

11

/

12

Passed

Validation

93%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

frontmatter_unknown_keys

Unknown frontmatter key(s) found; consider removing or moving to metadata

Warning

Total

15

/

16

Passed

Repository
JetBrains/MPS
Reviewed

Table of Contents

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