diff --git a/dist/datamodel/usage/UsageIndex.d.ts b/dist/datamodel/usage/UsageIndex.d.ts
index 69a02f0..5b29db9 100644
--- a/dist/datamodel/usage/UsageIndex.d.ts
+++ b/dist/datamodel/usage/UsageIndex.d.ts
@@ -1,4 +1,5 @@
 import type { MaskScope } from '../maskScope.js';
+import type { ParsedSlx } from '../parser/SlxParser.js';
 import type { NodeUsage } from '../../core/DataModel.js';
 /**
  * Where a name a block parameter refers to was defined.
@@ -131,6 +132,29 @@ export interface UsageIndex {
  * refusal to its caller.
  */
 export declare function summarizeFiles(files: UsageFile[]): FileSummaries;
+/**
+ * The model branch of `summarizeFiles`, over a structure the caller has ALREADY parsed.
+ *
+ * A host that shows a model's rows ran `parseModel` on those bytes to build them, and
+ * `summarizeFiles` runs it again on the same bytes to summarise the same model — a second
+ * full parse per model open, spent to learn nothing the caller was not holding. This takes
+ * the parse instead of the bytes; nothing else about the summary changes.
+ *
+ * The answer is a whole `FileSummaries` holding just this one model rather than a bare
+ * `ModelSummary`, so it is exactly what `summarizeFiles([{ srcId, filename, bytes }])`
+ * returns for a model and `mergeFileSummaries` folds it in beside the dictionaries and
+ * MAT-files summarised the ordinary way. usageIndex.test.ts pins that equality per fixture,
+ * because two ways to summarise a model is the shape a drift takes.
+ *
+ * `filename` is still required and is still not `srcId`: the model NAME comes off the
+ * basename (see `modelSummary`), and that is the name a block path and every reference
+ * record spell.
+ *
+ * No per-file `try` here, unlike `summarizeFiles`: there is no file to be unreadable. A
+ * caller with a parse in hand has already been told whether the bytes were readable, and
+ * swallowing a throw would hand back an empty answer for a model that HAD been parsed.
+ */
+export declare function summarizeParsedModel(parsed: ParsedSlx, srcId: string, filename: string): FileSummaries;
 /**
  * Where the name `name` resolves for a block of `model` sitting at `systemPath`, or null
  * if it does not.
diff --git a/dist/datamodel/usage/UsageIndex.d.ts.map b/dist/datamodel/usage/UsageIndex.d.ts.map
index 871c1fc..f777eb7 100644
--- a/dist/datamodel/usage/UsageIndex.d.ts.map
+++ b/dist/datamodel/usage/UsageIndex.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"UsageIndex.d.ts","sourceRoot":"","sources":["../../../src/datamodel/usage/UsageIndex.ts"],"names":[],"mappings":"AA2CA,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,iBAAiB,CAAC;AAKjD,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,wBAAwB,CAAC;AACxD,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,yBAAyB,CAAC;AAEzD;;;;;;GAMG;AACH,MAAM,MAAM,UAAU,GAAG,MAAM,GAAG,WAAW,GAAG,MAAM,GAAG,KAAK,CAAC;AAE/D;;;;;;;;;GASG;AACH,MAAM,WAAW,SAAS;IACxB,KAAK,EAAE,MAAM,CAAC;IACd,QAAQ,EAAE,MAAM,CAAC;IACjB,KAAK,EAAE,WAAW,CAAC;CACpB;AAED,4FAA4F;AAC5F,MAAM,WAAW,YAAY;IAC3B,KAAK,EAAE,MAAM,CAAC;IACd,kFAAkF;IAClF,IAAI,EAAE,MAAM,CAAC;IACb,0EAA0E;IAC1E,cAAc,EAAE,GAAG,CAAC,MAAM,CAAC,CAAC;IAC5B,uFAAuF;IACvF,QAAQ,EAAE,MAAM,EAAE,CAAC;IACnB,+CAA+C;IAC/C,OAAO,EAAE,MAAM,EAAE,CAAC;IAClB;;;;OAIG;IACH,KAAK,EAAE,SAAS,EAAE,CAAC;IAInB,WAAW,EAAE;QACX,SAAS,EAAE,MAAM,CAAC;QAClB,SAAS,EAAE,MAAM,CAAC;QAClB,GAAG,EAAE,MAAM,CAAC;QACZ,UAAU,EAAE,MAAM,CAAC;QACnB,QAAQ,EAAE,MAAM,CAAC;QACjB,UAAU,EAAE,MAAM,CAAC;KACpB,EAAE,CAAC;CACL;AAED,mGAAmG;AACnG,MAAM,WAAW,WAAW;IAC1B,KAAK,EAAE,MAAM,CAAC;IACd,KAAK,EAAE,GAAG,CAAC,MAAM,CAAC,CAAC;IACnB,0FAA0F;IAC1F,QAAQ,EAAE,MAAM,EAAE,CAAC;CACpB;AAED,MAAM,WAAW,aAAa;IAC5B,MAAM,EAAE,YAAY,EAAE,CAAC;IAGvB,UAAU,EAAE,GAAG,CAAC,MAAM,EAAE,WAAW,CAAC,CAAC;IACrC,SAAS,EAAE,GAAG,CAAC,MAAM,EAAE,WAAW,CAAC,CAAC;CACrC;AAED;;;;;;;;;;GAUG;AACH,MAAM,WAAW,WAAW;IAC1B,QAAQ,EAAE,MAAM,CAAC;IACjB,UAAU,EAAE,MAAM,CAAC;IACnB,IAAI,EAAE,MAAM,GAAG,IAAI,CAAC;IACpB,WAAW,EAAE,MAAM,GAAG,IAAI,CAAC;IAC3B,IAAI,EAAE,UAAU,GAAG,IAAI,CAAC;IACxB;;;;;OAKG;IACH,UAAU,EAAE,MAAM,CAAC;IACnB;;;;OAIG;IACH,SAAS,EAAE,SAAS,GAAG,IAAI,CAAC;CAC7B;AAED;;;;;;GAMG;AACH,MAAM,WAAW,UAAU;IACzB;;;;;;OAMG;IACH,QAAQ,CAAC,KAAK,EAAE,MAAM,EAAE,IAAI,EAAE,MAAM,GAAG,SAAS,EAAE,CAAC;IACnD;;;;;;;;OAQG;IACH,QAAQ,CAAC,UAAU,EAAE,MAAM,EAAE,QAAQ,EAAE,MAAM,GAAG,WAAW,EAAE,CAAC;IAC9D,sEAAsE;IACtE,QAAQ,CAAC,MAAM,EAAE,SAAS,YAAY,EAAE,CAAC;CAC1C;AAwFD;;;;;;;;GAQG;AACH,wBAAgB,cAAc,CAAC,KAAK,EAAE,SAAS,EAAE,GAAG,aAAa,CAqBhE;AAED;;;;;;;;;;;;;;;;;;;;;GAqBG;AACH,wBAAgB,oBAAoB,CAAC,MAAM,EAAE,SAAS,EAAE,KAAK,EAAE,MAAM,EAAE,QAAQ,EAAE,MAAM,GAAG,aAAa,CAEtG;AAID;;;;;;;;;;;;;;;;;;;GAmBG;AACH,wBAAgB,WAAW,CACzB,KAAK,EAAE,YAAY,EACnB,IAAI,EAAE,MAAM,EACZ,UAAU,EAAE,GAAG,CAAC,MAAM,EAAE,WAAW,CAAC,EACpC,SAAS,EAAE,GAAG,CAAC,MAAM,EAAE,WAAW,CAAC,EACnC,UAAU,GAAE,MAAW,GACtB;IAAE,IAAI,EAAE,UAAU,CAAC;IAAC,KAAK,EAAE,MAAM,CAAC;IAAC,SAAS,CAAC,EAAE,SAAS,CAAA;CAAE,GAAG,IAAI,CAqCnE;AAQD;;;;;;;;;;;;;;GAcG;AACH,wBAAgB,kBAAkB,CAAC,KAAK,EAAE,SAAS,aAAa,EAAE,GAAG,aAAa,CAcjF;AAED;;;;;;GAMG;AACH,wBAAgB,eAAe,CAAC,KAAK,EAAE,SAAS,EAAE,GAAG,UAAU,CAE9D;AAED;;;;;;;;GAQG;AACH,wBAAgB,4BAA4B,CAAC,SAAS,EAAE,aAAa,GAAG,UAAU,CA8FjF"}
\ No newline at end of file
diff --git a/dist/datamodel/usage/UsageIndex.js b/dist/datamodel/usage/UsageIndex.js
index cbe5f43..4ea7503 100644
--- a/dist/datamodel/usage/UsageIndex.js
+++ b/dist/datamodel/usage/UsageIndex.js
@@ -143,7 +143,10 @@ export function summarizeFiles(files) {
     for (const file of files) {
         try {
             if (isModelFile(file.filename)) {
-                models.push(modelSummary(parseModel(file.bytes, file.filename), file.srcId, file.filename));
+                // Through `summarizeParsedModel`, which is this branch with the parse still in front
+                // of it: a model summarised from bytes here and one summarised from a parse a caller
+                // already holds are then the same summary by construction, not by agreement.
+                models.push(...summarizeParsedModel(parseModel(file.bytes, file.filename), file.srcId, file.filename).models);
             }
             else if (isMatFile(file.filename)) {
                 matByName.set(refBasename(file.filename), matSummary(file.srcId, file.bytes));
@@ -158,6 +161,31 @@ export function summarizeFiles(files) {
     }
     return { models, slddByName, matByName };
 }
+/**
+ * The model branch of `summarizeFiles`, over a structure the caller has ALREADY parsed.
+ *
+ * A host that shows a model's rows ran `parseModel` on those bytes to build them, and
+ * `summarizeFiles` runs it again on the same bytes to summarise the same model — a second
+ * full parse per model open, spent to learn nothing the caller was not holding. This takes
+ * the parse instead of the bytes; nothing else about the summary changes.
+ *
+ * The answer is a whole `FileSummaries` holding just this one model rather than a bare
+ * `ModelSummary`, so it is exactly what `summarizeFiles([{ srcId, filename, bytes }])`
+ * returns for a model and `mergeFileSummaries` folds it in beside the dictionaries and
+ * MAT-files summarised the ordinary way. usageIndex.test.ts pins that equality per fixture,
+ * because two ways to summarise a model is the shape a drift takes.
+ *
+ * `filename` is still required and is still not `srcId`: the model NAME comes off the
+ * basename (see `modelSummary`), and that is the name a block path and every reference
+ * record spell.
+ *
+ * No per-file `try` here, unlike `summarizeFiles`: there is no file to be unreadable. A
+ * caller with a parse in hand has already been told whether the bytes were readable, and
+ * swallowing a throw would hand back an empty answer for a model that HAD been parsed.
+ */
+export function summarizeParsedModel(parsed, srcId, filename) {
+    return { models: [modelSummary(parsed, srcId, filename)], slddByName: new Map(), matByName: new Map() };
+}
 // --- Resolving ---------------------------------------------------------------
 /**
  * Where the name `name` resolves for a block of `model` sitting at `systemPath`, or null
diff --git a/dist/datamodel/usage/UsageIndex.js.map b/dist/datamodel/usage/UsageIndex.js.map
index 3d59948..459980a 100644
--- a/dist/datamodel/usage/UsageIndex.js.map
+++ b/dist/datamodel/usage/UsageIndex.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/dist/index.d.ts b/dist/index.d.ts
index 596fc4d..3fe2bca 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -40,7 +40,7 @@ export { scanModelStructure, type ModelStructure } from './datamodel/parser/Mode
 export { DATA_PART, DATA_PART_XML, DATA_PART_KEY, TEXT_PARTS, TEXT_CONTENT } from './datamodel/parser/SlddParts.js';
 export { SC_PART, SC_PART_XML, SC_TYPE_TO_CLASSIFICATION, applyScEdits, catalogFromDefinitions, classificationOf, scRenameEdits, scanScJsonText, scanScXml, } from './datamodel/parser/ScCatalog.js';
 export type { ScDefinition, ScNameSite, ScTextEdit, SystemComposerCatalog } from './datamodel/parser/ScCatalog.js';
-export { buildUsageIndex, buildUsageIndexFromSummaries, mergeFileSummaries, summarizeFiles, resolveName, } from './datamodel/usage/UsageIndex.js';
+export { buildUsageIndex, buildUsageIndexFromSummaries, mergeFileSummaries, summarizeFiles, summarizeParsedModel, resolveName, } from './datamodel/usage/UsageIndex.js';
 export type { UsageIndex, UsageFile, FileSummaries, ModelSummary, DataSummary, ParamOrigin, OriginKind, } from './datamodel/usage/UsageIndex.js';
 export { maskDefining } from './datamodel/maskScope.js';
 export type { MaskScope } from './datamodel/maskScope.js';
diff --git a/dist/index.d.ts.map b/dist/index.d.ts.map
index 6eb52ed..5b4aaea 100644
--- a/dist/index.d.ts.map
+++ b/dist/index.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAMA,OAAO,uCAAuC,CAAC;AAG/C,OAAO,EAAE,OAAO,IAAI,SAAS,EAAE,MAAM,qBAAqB,CAAC;AAC3D,YAAY,EAAE,OAAO,EAAE,UAAU,EAAE,MAAM,qBAAqB,CAAC;AAC/D,OAAO,KAAK,QAAQ,MAAM,oBAAoB,CAAC;AAC/C,OAAO,EAAE,OAAO,EAAE,SAAS,EAAE,MAAM,oBAAoB,CAAC;AACxD,YAAY,EAAE,MAAM,EAAE,YAAY,EAAE,MAAM,oBAAoB,CAAC;AAC/D,OAAO,KAAK,WAAW,MAAM,uBAAuB,CAAC;AAGrD,OAAO,EAAE,aAAa,EAAE,MAAM,qBAAqB,CAAC;AACpD,YAAY,EAAE,OAAO,EAAE,oBAAoB,EAAE,MAAM,qBAAqB,CAAC;AAGzE,YAAY,EAAE,gBAAgB,EAAE,MAAM,qBAAqB,CAAC;AAI5D,YAAY,EAAE,cAAc,EAAE,MAAM,qBAAqB,CAAC;AAO1D,YAAY,EAAE,cAAc,EAAE,SAAS,EAAE,mBAAmB,EAAE,MAAM,qBAAqB,CAAC;AAO1F,OAAO,EAAE,aAAa,EAAE,MAAM,4BAA4B,CAAC;AAY3D,OAAO,EAAE,QAAQ,EAAE,UAAU,EAAE,iBAAiB,EAAE,aAAa,EAAE,MAAM,8BAA8B,CAAC;AACtG,OAAO,EAAE,cAAc,EAAE,MAAM,oBAAoB,CAAC;AACpD,YAAY,EAAE,gBAAgB,EAAE,MAAM,oBAAoB,CAAC;AAC3D,OAAO,EAAE,iBAAiB,EAAE,MAAM,uBAAuB,CAAC;AAC1D,YAAY,EAAE,mBAAmB,EAAE,MAAM,uBAAuB,CAAC;AAQjE,OAAO,EAAE,gBAAgB,EAAE,sBAAsB,EAAE,MAAM,+BAA+B,CAAC;AACzF,YAAY,EAAE,aAAa,EAAE,MAAM,+BAA+B,CAAC;AAGnE,OAAO,EAAE,eAAe,EAAE,oBAAoB,EAAE,MAAM,wCAAwC,CAAC;AAQ/F,OAAO,EAAE,mBAAmB,EAAE,mBAAmB,EAAE,MAAM,4CAA4C,CAAC;AACtG,OAAO,EAAE,QAAQ,EAAE,MAAM,iCAAiC,CAAC;AAC3D,OAAO,EAAE,QAAQ,EAAE,MAAM,iCAAiC,CAAC;AAG3D,OAAO,EAAE,UAAU,EAAE,MAAM,mCAAmC,CAAC;AAC/D,OAAO,EAAE,QAAQ,EAAE,MAAM,iCAAiC,CAAC;AAC3D,OAAO,EAAE,YAAY,EAAE,MAAM,qCAAqC,CAAC;AACnE,YAAY,EAAE,aAAa,EAAE,WAAW,EAAE,YAAY,EAAE,gBAAgB,EAAE,MAAM,qCAAqC,CAAC;AAUtH,YAAY,EAAE,SAAS,EAAE,eAAe,EAAE,MAAM,iCAAiC,CAAC;AAClF,YAAY,EAAE,SAAS,EAAE,MAAM,iCAAiC,CAAC;AACjE,YAAY,EAAE,SAAS,EAAE,WAAW,EAAE,MAAM,iCAAiC,CAAC;AAK9E,YAAY,EAAE,YAAY,EAAE,gBAAgB,EAAE,MAAM,oCAAoC,CAAC;AAGzF,OAAO,EAAE,MAAM,EAAE,MAAM,kBAAkB,CAAC;AAC1C,YAAY,EAAE,aAAa,EAAE,aAAa,EAAE,MAAM,kBAAkB,CAAC;AAkBrE,OAAO,EACL,KAAK,EACL,UAAU,EACV,WAAW,EACX,WAAW,EACX,WAAW,EACX,aAAa,EACb,WAAW,EACX,UAAU,EACV,SAAS,EACT,aAAa,GACd,MAAM,0BAA0B,CAAC;AAUlC,OAAO,EAAE,eAAe,EAAE,gBAAgB,EAAE,eAAe,EAAE,iBAAiB,EAAE,MAAM,mCAAmC,CAAC;AAS1H,OAAO,EAAE,QAAQ,EAAE,KAAK,cAAc,EAAE,MAAM,gCAAgC,CAAC;AAU/E,OAAO,EAAE,OAAO,EAAE,KAAK,aAAa,EAAE,MAAM,+BAA+B,CAAC;AAU5E,OAAO,EAAE,kBAAkB,EAAE,KAAK,cAAc,EAAE,MAAM,0CAA0C,CAAC;AAWnG,OAAO,EAAE,SAAS,EAAE,aAAa,EAAE,aAAa,EAAE,UAAU,EAAE,YAAY,EAAE,MAAM,iCAAiC,CAAC;AAWpH,OAAO,EACL,OAAO,EACP,WAAW,EACX,yBAAyB,EACzB,YAAY,EACZ,sBAAsB,EACtB,gBAAgB,EAChB,aAAa,EACb,cAAc,EACd,SAAS,GACV,MAAM,iCAAiC,CAAC;AACzC,YAAY,EAAE,YAAY,EAAE,UAAU,EAAE,UAAU,EAAE,qBAAqB,EAAE,MAAM,iCAAiC,CAAC;AAgBnH,OAAO,EACL,eAAe,EACf,4BAA4B,EAC5B,kBAAkB,EAClB,cAAc,EACd,oBAAoB,EACpB,WAAW,GACZ,MAAM,iCAAiC,CAAC;AACzC,YAAY,EACV,UAAU,EACV,SAAS,EACT,aAAa,EACb,YAAY,EACZ,WAAW,EACX,WAAW,EACX,UAAU,GACX,MAAM,iCAAiC,CAAC;AAKzC,OAAO,EAAE,YAAY,EAAE,MAAM,0BAA0B,CAAC;AACxD,YAAY,EAAE,SAAS,EAAE,MAAM,0BAA0B,CAAC;AAG1D,OAAO,EAAE,KAAK,EAAE,MAAM,eAAe,CAAC;AACtC,YAAY,EAAE,OAAO,EAAE,OAAO,EAAE,SAAS,EAAE,YAAY,EAAE,MAAM,eAAe,CAAC;AAG/E,OAAO,EAAE,OAAO,IAAI,cAAc,EAAE,MAAM,yCAAyC,CAAC;AACpF,OAAO,EAAE,OAAO,IAAI,QAAQ,EAAE,MAAM,wCAAwC,CAAC;AAC7E,OAAO,EAAE,YAAY,EAAE,MAAM,2CAA2C,CAAC;AACzE,OAAO,EAAE,kBAAkB,EAAE,MAAM,kCAAkC,CAAC;AACtE,OAAO,EAAE,YAAY,EAAE,MAAM,wBAAwB,CAAC;AACtD,OAAO,EAAE,kBAAkB,EAAE,MAAM,iCAAiC,CAAC;AAKrE,OAAO,EAAE,OAAO,IAAI,WAAW,EAAE,MAAM,iCAAiC,CAAC;AAWzE,OAAO,EAAE,cAAc,EAAE,kBAAkB,EAAE,MAAM,qBAAqB,CAAC;AACzE,YAAY,EAAE,SAAS,EAAE,MAAM,qBAAqB,CAAC;AAmBrD,OAAO,EAAE,mBAAmB,EAAE,oBAAoB,EAAE,uBAAuB,EAAE,MAAM,sCAAsC,CAAC;AAC1H,YAAY,EAAE,OAAO,EAAE,MAAM,sCAAsC,CAAC;AACpE,OAAO,EAAE,eAAe,EAAE,eAAe,EAAE,MAAM,qCAAqC,CAAC;AACvF,YAAY,EAAE,aAAa,EAAE,MAAM,qCAAqC,CAAC;AAczE,OAAO,EAAE,aAAa,EAAE,MAAM,8BAA8B,CAAC;AAe7D,OAAO,EAAE,YAAY,EAAE,MAAM,wBAAwB,CAAC;AACtD,YAAY,EAAE,YAAY,EAAE,UAAU,EAAE,MAAM,wBAAwB,CAAC;AAqBvE,OAAO,EAAE,aAAa,EAAE,MAAM,0CAA0C,CAAC;AAGzE,YAAY,EAAE,OAAO,EAAE,SAAS,EAAE,QAAQ,EAAE,UAAU,EAAE,QAAQ,EAAE,MAAM,8BAA8B,CAAC"}
\ No newline at end of file
diff --git a/dist/index.js b/dist/index.js
index 468a941..66af5bf 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -141,7 +141,10 @@ export { SC_PART, SC_PART_XML, SC_TYPE_TO_CLASSIFICATION, applyScEdits, catalogF
 // parses each file once and rebuilds the maps as its query scope changes — summarise per
 // file, `mergeFileSummaries` them in workspace order, `buildUsageIndexFromSummaries`. The
 // halves compose back into the whole, which usageIndex.test.ts pins over every answer.
-export { buildUsageIndex, buildUsageIndexFromSummaries, mergeFileSummaries, summarizeFiles, resolveName, } from './datamodel/usage/UsageIndex.js';
+// `summarizeParsedModel` splits the summarising half the same way for the file a host has
+// OPEN: it already parsed those bytes for the model's own rows, and `summarizeFiles` would
+// parse them a second time to say which blocks use what. Same summary, one parse.
+export { buildUsageIndex, buildUsageIndexFromSummaries, mergeFileSummaries, summarizeFiles, summarizeParsedModel, resolveName, } from './datamodel/usage/UsageIndex.js';
 // The innermost of those scopes, and the only one that is not a file: a masked subsystem's
 // own parameters. On the barrel because `ParamOrigin.maskBlock` hands one out — a host
 // rendering a mask-resolved parameter needs the block's path to name the source of the
diff --git a/dist/index.js.map b/dist/index.js.map
index 84eb089..09f7450 100644
--- a/dist/index.js.map
+++ b/dist/index.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/package.json b/package.json
index c437b45..9ce0614 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "data-explorer-core",
-  "version": "1.19.0",
+  "version": "1.20.0",
   "description": "Parser, data model, and node schema for Simulink data-dictionary, model, MAT-file, and project files. Presentation-independent; embeddable in-process.",
   "license": "BSD-3-Clause",
   "type": "module",
diff --git a/src/datamodel/usage/UsageIndex.ts b/src/datamodel/usage/UsageIndex.ts
index eccba73..5de7849 100644
--- a/src/datamodel/usage/UsageIndex.ts
+++ b/src/datamodel/usage/UsageIndex.ts
@@ -284,7 +284,10 @@ export function summarizeFiles(files: UsageFile[]): FileSummaries {
   for (const file of files) {
     try {
       if (isModelFile(file.filename)) {
-        models.push(modelSummary(parseModel(file.bytes, file.filename), file.srcId, file.filename));
+        // Through `summarizeParsedModel`, which is this branch with the parse still in front
+        // of it: a model summarised from bytes here and one summarised from a parse a caller
+        // already holds are then the same summary by construction, not by agreement.
+        models.push(...summarizeParsedModel(parseModel(file.bytes, file.filename), file.srcId, file.filename).models);
       } else if (isMatFile(file.filename)) {
         matByName.set(refBasename(file.filename), matSummary(file.srcId, file.bytes));
       } else if (isSlddFile(file.filename)) {
@@ -297,6 +300,32 @@ export function summarizeFiles(files: UsageFile[]): FileSummaries {
   return { models, slddByName, matByName };
 }
 
+/**
+ * The model branch of `summarizeFiles`, over a structure the caller has ALREADY parsed.
+ *
+ * A host that shows a model's rows ran `parseModel` on those bytes to build them, and
+ * `summarizeFiles` runs it again on the same bytes to summarise the same model — a second
+ * full parse per model open, spent to learn nothing the caller was not holding. This takes
+ * the parse instead of the bytes; nothing else about the summary changes.
+ *
+ * The answer is a whole `FileSummaries` holding just this one model rather than a bare
+ * `ModelSummary`, so it is exactly what `summarizeFiles([{ srcId, filename, bytes }])`
+ * returns for a model and `mergeFileSummaries` folds it in beside the dictionaries and
+ * MAT-files summarised the ordinary way. usageIndex.test.ts pins that equality per fixture,
+ * because two ways to summarise a model is the shape a drift takes.
+ *
+ * `filename` is still required and is still not `srcId`: the model NAME comes off the
+ * basename (see `modelSummary`), and that is the name a block path and every reference
+ * record spell.
+ *
+ * No per-file `try` here, unlike `summarizeFiles`: there is no file to be unreadable. A
+ * caller with a parse in hand has already been told whether the bytes were readable, and
+ * swallowing a throw would hand back an empty answer for a model that HAD been parsed.
+ */
+export function summarizeParsedModel(parsed: ParsedSlx, srcId: string, filename: string): FileSummaries {
+  return { models: [modelSummary(parsed, srcId, filename)], slddByName: new Map(), matByName: new Map() };
+}
+
 // --- Resolving ---------------------------------------------------------------
 
 /**
diff --git a/src/index.ts b/src/index.ts
index 5a081b8..a4c182f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -216,11 +216,15 @@ export type { ScDefinition, ScNameSite, ScTextEdit, SystemComposerCatalog } from
 // parses each file once and rebuilds the maps as its query scope changes — summarise per
 // file, `mergeFileSummaries` them in workspace order, `buildUsageIndexFromSummaries`. The
 // halves compose back into the whole, which usageIndex.test.ts pins over every answer.
+// `summarizeParsedModel` splits the summarising half the same way for the file a host has
+// OPEN: it already parsed those bytes for the model's own rows, and `summarizeFiles` would
+// parse them a second time to say which blocks use what. Same summary, one parse.
 export {
   buildUsageIndex,
   buildUsageIndexFromSummaries,
   mergeFileSummaries,
   summarizeFiles,
+  summarizeParsedModel,
   resolveName,
 } from './datamodel/usage/UsageIndex.js';
 export type {
diff --git a/test/usageIndex.test.ts b/test/usageIndex.test.ts
index 22cc55b..87b4008 100644
--- a/test/usageIndex.test.ts
+++ b/test/usageIndex.test.ts
@@ -28,6 +28,7 @@ import {
   buildUsageIndexFromSummaries,
   mergeFileSummaries,
   summarizeFiles,
+  summarizeParsedModel,
   resolveName,
   parseModel,
 } from '../src/index.js';
@@ -795,6 +796,147 @@ describe('buildUsageIndexFromSummaries — the same index, from summaries a call
   });
 });
 
+// The same split one file further in, for the model a host has OPEN: it parsed those bytes
+// to build the model's own rows, and `summarizeFiles` parses them a second time to say which
+// blocks use what. `summarizeParsedModel` takes the parse instead.
+//
+// Which makes two ways to summarise one model, and the tests that matter are the ones
+// BETWEEN them — an equality per fixture, not a check that the new path answers plausibly.
+// A summariser reachable two ways that reads a different field on one of them is the failure
+// mode here, and only a comparison catches it.
+describe('summarizeParsedModel — the same summary, from a parse the caller already holds', () => {
+  // A distinct srcId, never the filename: the two are separate arguments and the summary
+  // carries both differently — the srcId verbatim, the NAME off the basename — so a fixture
+  // where they coincided would let either one stand in for the other.
+  const opened = (name: string, bytes: ArrayBuffer): UsageFile => file(name, bytes, `src:${name}`);
+
+  // Every part of a model a summary reads, one fixture each: block parameters with a
+  // dictionary link and externals, a real model workspace (a binary mxarray part, which is
+  // where reading the wrong field of ParsedSlx would show), mask workspaces, a model that
+  // links files but has no blocks, and one that parses to nothing at all.
+  const MODELS: [what: string, load: () => UsageFile][] = [
+    [
+      'block parameters, a linked dictionary and an external MAT',
+      () =>
+        opened(
+          'm.slx',
+          slxModel({
+            dictionary: 'top.sldd',
+            externals: ['extra.mat'],
+            workspaceMat: 'ws.mat',
+            blocks: block('G', 'Gain', 'Gain', 'Kp') + block('C', 'Constant', 'Value', 'deep*Numeric', '2'),
+          }),
+        ),
+    ],
+    // 8 workspace variables, 5 block parameters, and `mdlparams.sldd` recorded as its link.
+    ['a real model workspace, off bytes MATLAB wrote', () => opened('mdlcases.mdl', artifact('mdl/mdlcases.mdl'))],
+    // 3 mask workspaces over 12 block parameters, including a mask parameter that shadows a
+    // model workspace variable of the same name.
+    ['mask workspaces', () => opened('mdlmask.slx', artifact('mdl/mdlmask.slx'))],
+    // Links a dictionary and a MAT-file and has no block parameters at all.
+    ['file links but no block parameters', () => opened('model_with_refs.slx', fixtureBytes('model_with_refs.slx'))],
+    ['a large model workspace and no links', () => opened('cases.slx', artifact('slx/cases.slx'))],
+    // Parses, and yields nothing usable: no blocks, no workspace, no links. Both paths owe
+    // the same empty-ish summary here rather than a throw on either.
+    ['nothing usable — it parses and defines nothing', () => opened('bare.slx', slxModel({ blocks: '' }))],
+  ];
+
+  for (const [what, load] of MODELS) {
+    it(`equals summarizeFiles over the same bytes — ${what}`, () => {
+      const { srcId, filename, bytes } = load();
+      expect(summarizeParsedModel(parseModel(bytes, filename), srcId, filename)).toEqual(
+        summarizeFiles([{ srcId, filename, bytes }]),
+      );
+    });
+  }
+
+  it('really is comparing summaries with something in them', () => {
+    // The equalities above are worthless if every fixture summarises to nothing, so the
+    // three fields that carry a model's scopes are pinned non-empty on the fixtures chosen
+    // for them — and empty on the one chosen to be empty.
+    const summaryFor = (f: UsageFile): ModelSummary =>
+      summarizeParsedModel(parseModel(f.bytes, f.filename), f.srcId, f.filename).models[0];
+
+    const params = summaryFor(MODELS[0][1]());
+    expect(params.blockParams).toHaveLength(2);
+    expect(params.slddRefs).toEqual(['top.sldd']);
+    expect(params.matRefs).toEqual(['extra.mat', 'ws.mat']);
+
+    const workspace = summaryFor(MODELS[1][1]());
+    expect([...workspace.workspaceNames]).toContain('tau');
+    expect(workspace.name).toBe('mdlcases');
+    expect(workspace.srcId).toBe('src:mdlcases.mdl');
+
+    expect(summaryFor(MODELS[2][1]()).masks).toHaveLength(3);
+
+    // And the empty one: still ONE model, named, with every scope empty — what a host gets
+    // for a file it opened and that turned out to define nothing.
+    const bare = summaryFor(MODELS[5][1]());
+    expect(bare).toEqual({
+      srcId: 'src:bare.slx',
+      name: 'bare',
+      workspaceNames: new Set(),
+      slddRefs: [],
+      matRefs: [],
+      masks: [],
+      blockParams: [],
+    });
+  });
+
+  it('has no answer to give for bytes the parser refuses, because there is no parse', () => {
+    // The other half of the empty case, and the one place the two paths CANNOT be compared:
+    // `summarizeFiles` drops an unreadable file silently (its per-file catch), while this
+    // path is never reached for one — the caller's own `parseModel` threw first and it has
+    // nothing to hand over. So the summary this function does not produce is the summary
+    // `summarizeFiles` does not produce either.
+    const junk = strToU8('not a zip').buffer as ArrayBuffer;
+    expect(() => parseModel(junk, 'junk.slx')).toThrow();
+    expect(summarizeFiles([file('junk.slx', junk)])).toEqual({
+      models: [],
+      slddByName: new Map(),
+      matByName: new Map(),
+    });
+  });
+
+  it('composes with the rest of the workspace through mergeFileSummaries', () => {
+    // The whole point of returning a `FileSummaries` rather than a bare `ModelSummary`: the
+    // model is the file the host has open and parsed, the dictionaries and MAT-files beside
+    // it are only ever read as bytes, and the two kinds of part fold together into the index
+    // one pass over all four files would have built.
+    const model = MODELS[0][1]();
+    const rest = [
+      file('top.sldd', slddBytes(['Kp'], ['leaf.sldd'])),
+      file('leaf.sldd', slddBytes(['deep'])),
+      file('extra.mat', fixtureBytes('mcos/Numeric.mat')),
+    ];
+    const merged = mergeFileSummaries([
+      summarizeParsedModel(parseModel(model.bytes, model.filename), model.srcId, model.filename),
+      summarizeFiles(rest),
+    ]);
+    const composed = buildUsageIndexFromSummaries(merged);
+    const whole = buildUsageIndex([model, ...rest]);
+
+    // Not a vacuous comparison: this corpus resolves down a dictionary chain and into a MAT.
+    expect(whole.usagesOf('top.sldd', 'Kp')).toHaveLength(1);
+    expect(whole.usagesOf('leaf.sldd', 'deep')).toHaveLength(1);
+    expect(whole.usagesOf('extra.mat', 'Numeric')).toHaveLength(1);
+    expect(whole.paramsOf(model.srcId, '2')).not.toEqual([]);
+
+    expect(composed.models).toEqual(whole.models);
+    for (const [srcId, name] of [
+      ['top.sldd', 'Kp'],
+      ['leaf.sldd', 'deep'],
+      ['extra.mat', 'Numeric'],
+      [model.srcId, 'Kp'],
+    ] as const) {
+      expect(composed.usagesOf(srcId, name)).toEqual(whole.usagesOf(srcId, name));
+    }
+    for (const sid of ['1', '2']) {
+      expect(composed.paramsOf(model.srcId, sid)).toEqual(whole.paramsOf(model.srcId, sid));
+    }
+  });
+});
+
 describe('on a real model MATLAB wrote', () => {
   // mdlcases.mdl is harvested from MATLAB: its own model workspace defines `tau`, `span`
   // and `inner`, its block parameters read `Kp`, `Ki`, `[tau 1]`, `span` and `inner`, and