MCP tools
mastercss_inspect_class
Inspect one Master CSS class and return semantic parts, generated rules, variables, and CSS text.
Contract
Check how one class is interpreted by the active manifest. Use mastercss_trace_class when the question is whether project scanning actually finds it.
Input
Complete input schema
{ "$schema": "http://json-schema.org/draft-07/schema#", "type": "object", "properties": { "context": { "type": "string", "enum": [ "project", "preset" ] }, "className": { "type": "string", "minLength": 1 }, "mode": { "type": "string" } }, "required": [ "className" ]}Example
Call mastercss_inspect_class from a connected MCP client with these arguments:
{ "className": "p-md"}Inspect a preset spacing class in the connected workspace.
Output
The result includes className, matchStatus, cssSyntaxStatus, cssValueStatus, browserSupport, rules, semantic inspection data, and the generated css string. Check manifest.status and entries before using custom tokens. A matched class alone does not establish that it appears in scanned source.
Every tool returns an object with version: 3, metadata, diagnostics and result. Success payload fields described above live in result.data; failure has result.status: "error" and a required { code, message } error. JSON text equals structuredContent. Tool errors set isError. Metadata records actual context, package/language/binding versions, manifest fingerprint, entries and dependencies; unavailable information is null or an empty array.
Complete output schema
{ "$schema": "http://json-schema.org/draft-07/schema#", "type": "object", "properties": { "version": { "type": "number", "const": 3 }, "metadata": { "type": "object", "properties": { "versions": { "anyOf": [ { "type": "object", "properties": { "languageVersion": { "type": "number" }, "bindingAbiVersion": { "type": "number" }, "packageVersion": { "type": "string" } }, "required": [ "languageVersion", "bindingAbiVersion", "packageVersion" ], "additionalProperties": {} }, { "type": "null" } ] }, "context": { "anyOf": [ { "type": "string", "enum": [ "project", "preset" ] }, { "type": "null" } ] }, "manifestFingerprint": { "type": [ "string", "null" ] }, "entries": { "type": "array", "items": { "type": "string" } }, "dependencies": { "type": "array", "items": { "type": "string" } } }, "required": [ "versions", "context", "manifestFingerprint", "entries", "dependencies" ], "additionalProperties": false }, "diagnostics": { "type": "array", "items": { "type": "object", "properties": { "code": { "type": "string" }, "phase": { "type": "string" }, "severity": { "type": [ "string", "number" ] }, "message": { "type": "string" }, "notes": { "type": "array", "items": { "type": "string" } }, "alternatives": { "type": "array", "items": { "type": "string" } }, "source": { "type": "string" }, "range": { "anyOf": [ { "type": "object", "properties": { "start": { "type": "number" }, "end": { "type": "number" } }, "required": [ "start", "end" ], "additionalProperties": false }, { "type": "object", "properties": { "start": { "type": "object", "properties": { "line": { "type": "number" }, "character": { "type": "number" } }, "required": [ "line", "character" ], "additionalProperties": false }, "end": { "type": "object", "properties": { "line": { "type": "number" }, "character": { "type": "number" } }, "required": [ "line", "character" ], "additionalProperties": false } }, "required": [ "start", "end" ], "additionalProperties": false } ] } }, "required": [ "message" ], "additionalProperties": {} } }, "result": { "oneOf": [ { "type": "object", "properties": { "status": { "type": "string", "const": "success" }, "data": { "type": "object", "properties": { "manifest": { "type": "object", "properties": { "context": { "type": "string", "enum": [ "project", "preset" ] }, "status": { "type": "string", "enum": [ "loaded", "error" ] }, "fingerprint": { "type": [ "string", "null" ] }, "entries": { "type": "array", "items": { "type": "string" } }, "dependencies": { "type": "array", "items": { "type": "string" } }, "versions": { "type": "object", "properties": { "languageVersion": { "type": "number" }, "bindingAbiVersion": { "type": "number" }, "packageVersion": { "type": "string" } }, "required": [ "languageVersion", "bindingAbiVersion", "packageVersion" ], "additionalProperties": {} } }, "required": [ "context", "status", "fingerprint", "entries", "dependencies" ], "additionalProperties": {} }, "className": { "type": "string" }, "matchStatus": { "type": "string", "enum": [ "matched", "unmatched", "ambiguous", "syntax-error" ] }, "cssSyntaxStatus": { "type": "string", "enum": [ "valid", "invalid", "unknown", "not-checked" ] }, "cssValueStatus": { "type": "string", "enum": [ "valid", "invalid", "unknown", "not-checked" ] }, "browserSupport": { "type": "string", "enum": [ "supported", "unsupported", "unknown", "not-checked" ] }, "checks": { "type": "array", "items": { "type": "object", "properties": { "name": { "type": "string" }, "version": { "type": "string" }, "phase": { "type": "string" }, "scope": { "type": "string" } }, "required": [ "name", "version", "phase", "scope" ], "additionalProperties": false } }, "declarations": { "type": "array", "items": { "type": "object", "properties": { "property": { "type": "string" }, "value": { "type": "string" }, "status": { "type": "string", "enum": [ "valid", "invalid", "unknown", "not-checked" ] }, "range": { "type": "object", "properties": { "start": { "type": "number" }, "end": { "type": "number" } }, "required": [ "start", "end" ], "additionalProperties": false }, "error": { "type": "string" } }, "required": [ "property", "value", "status" ], "additionalProperties": {} } }, "rules": { "type": "array", "items": { "type": "object", "properties": { "className": { "type": "string" }, "key": { "type": "string" }, "layer": { "type": "string", "enum": [ "base", "defaults", "components", "utilities" ] }, "type": { "type": "number" }, "sortTier": { "type": "number" }, "text": { "type": "string" }, "selectorText": { "type": "string" }, "priority": { "type": "object", "properties": { "features": { "type": "array", "items": { "type": "object", "properties": { "domain": { "type": "string" }, "feature": { "type": "string" }, "unit": { "type": "string" }, "lower": { "anyOf": [ { "type": "object", "properties": { "value": { "type": "number" }, "inclusive": { "type": "boolean" } }, "required": [ "value", "inclusive" ], "additionalProperties": false }, { "type": "null" } ] }, "upper": { "anyOf": [ { "type": "object", "properties": { "value": { "type": "number" }, "inclusive": { "type": "boolean" } }, "required": [ "value", "inclusive" ], "additionalProperties": false }, { "type": "null" } ] } }, "required": [ "domain", "feature", "unit", "lower", "upper" ], "additionalProperties": false } }, "selector": { "type": "number" }, "conditions": { "type": "array", "items": { "type": "string" } }, "sortKey": { "type": "string" }, "valuePriority": { "type": "number" } }, "required": [ "features", "selector" ], "additionalProperties": false }, "nodes": { "type": "array", "items": { "type": "object", "properties": { "text": { "type": "string" } }, "required": [ "text" ], "additionalProperties": false } }, "variableNames": { "type": "array", "items": { "type": "string" } }, "animationNames": { "type": "array", "items": { "type": "string" } } }, "required": [ "className", "key", "layer", "type", "sortTier", "priority" ], "additionalProperties": false } }, "variables": { "type": "array", "items": { "type": "object", "properties": { "key": { "type": "string" }, "variable": { "type": "object", "properties": { "key": { "type": "string" }, "name": { "type": "string" }, "namespace": { "type": "string" }, "type": { "type": "string" }, "value": { "anyOf": [ { "type": "string" }, { "type": "number" }, { "type": "boolean", "const": false }, { "type": "array", "items": { "type": [ "string", "number" ] } } ] }, "numeric": { "type": "object", "properties": { "value": { "type": "number" }, "unit": { "type": "string" } }, "required": [ "value" ], "additionalProperties": false }, "dependencies": { "type": "array", "items": { "type": "string" } }, "modes": { "type": "object", "propertyNames": { "type": "string" }, "additionalProperties": { "type": "object", "properties": { "type": { "type": "string", "enum": [ "string", "number" ] }, "value": { "type": [ "string", "number" ] }, "numeric": { "type": "object", "properties": { "value": { "type": "number" }, "unit": { "type": "string" } }, "required": [ "value" ], "additionalProperties": false } }, "required": [ "type", "value" ], "additionalProperties": false } }, "inline": { "type": "boolean" }, "static": { "type": "boolean" }, "mode": { "type": "string" } }, "required": [ "key", "name", "type", "dependencies" ], "additionalProperties": false } }, "required": [ "key", "variable" ], "additionalProperties": false } }, "diagnostics": { "type": "array", "items": { "type": "object", "properties": { "code": { "type": "string" }, "phase": { "type": "string" }, "severity": { "type": [ "string", "number" ] }, "message": { "type": "string" }, "notes": { "type": "array", "items": { "type": "string" } }, "alternatives": { "type": "array", "items": { "type": "string" } }, "source": { "type": "string" }, "range": { "anyOf": [ { "type": "object", "properties": { "start": { "type": "number" }, "end": { "type": "number" } }, "required": [ "start", "end" ], "additionalProperties": false }, { "type": "object", "properties": { "start": { "type": "object", "properties": { "line": { "type": "number" }, "character": { "type": "number" } }, "required": [ "line", "character" ], "additionalProperties": false }, "end": { "type": "object", "properties": { "line": { "type": "number" }, "character": { "type": "number" } }, "required": [ "line", "character" ], "additionalProperties": false } }, "required": [ "start", "end" ], "additionalProperties": false } ] } }, "required": [ "message" ], "additionalProperties": {} } }, "css": { "type": "string" } }, "required": [ "manifest", "className", "matchStatus", "cssSyntaxStatus", "cssValueStatus", "browserSupport", "checks", "declarations", "rules", "variables", "css" ], "additionalProperties": {} } }, "required": [ "status", "data" ], "additionalProperties": false }, { "type": "object", "properties": { "status": { "type": "string", "const": "error" }, "error": { "type": "object", "properties": { "code": { "type": "string" }, "message": { "type": "string" } }, "required": [ "code", "message" ], "additionalProperties": false } }, "required": [ "status", "error" ], "additionalProperties": false } ] } }, "required": [ "version", "metadata", "diagnostics", "result" ], "additionalProperties": false}Project context and lifecycle
This operation does not write workspace files.
The local stdio server uses the workspace passed to --root. Confirm the root and intended CSS entries with mastercss_workspace_info before relying on project-dependent values.
See the MCP workflow guide for client setup and the preview/apply workflow.