improvement(provenance): name the block behind an unprojected input root

apps/sim/executor/handlers/generic/generic-handler.ts

@@ -185,8 +185,16 @@ export class GenericBlockHandler implements BlockHandler {
               try {
                 finalInputs[key] = JSON.parse(value.trim())
               } catch (error) {
+                /**
+                 * The failure class, not the thrown message. This parses a resolved input, so the
+                 * string may be a secret, and V8 quotes the text it rejected back into the
+                 * message — `Unexpected token 's', "sk-live-EX"... is not valid JSON`. That
+                 * prefix is enough to leak. The field name and its declared type are already in
+                 * the message above, and `SyntaxError` is the only class `JSON.parse` throws, so
+                 * nothing diagnostic is lost.
+                 */
                 logger.warn(`Failed to parse ${inputType} field "${key}":`, {
-                  error: toError(error).message,
+                  error: toError(error).name,
                 })
               }
             }
@@ -199,8 +207,11 @@ export class GenericBlockHandler implements BlockHandler {
         boundary && boundary.paths.length > 0 && registry?.hasResolvedInputProjections()
           ? registry.projectResolvedInputSelections(inputs)
           : undefined
-      if (projectedInputs?.complete === false)
-        registry?.markIncomplete('structural-input-projection-incomplete')
+      if (projectedInputs?.complete === false) {
+        registry?.markIncomplete('structural-input-projection-incomplete', {
+          detail: { blockType, ...(tool ? { tool: tool.id } : {}) },
+        })
+      }
 
       if (projectedInputs?.complete && boundary && tool && registry) {
         for (const projection of projectedInputs.values) {
@@ -220,7 +231,7 @@ export class GenericBlockHandler implements BlockHandler {
                 ...blockConfig.tools.config.params(projectedFinalInputs),
               }
             }
-          } catch {
+          } catch (error) {
             const structuredProjection = createStructuredModelProjection(
               tool,
               finalInputs,
@@ -234,7 +245,21 @@ export class GenericBlockHandler implements BlockHandler {
               continue
             }
             if (boundary.requiredProjectionRoots.has(projection.path[0])) {
-              registry.markIncomplete('structural-input-root-unprojected')
+              /**
+               * `config.params` threw on the projected inputs — the copy where a secret has been
+               * replaced by its placeholder — and no structured projection could recover it. The
+               * reason alone said only that this happened somewhere, which is not enough to find
+               * the block. The failure class rather than the thrown message, because a coercion
+               * that rejects a value tends to quote it, and this input may hold a secret.
+               */
+              registry.markIncomplete('structural-input-root-unprojected', {
+                detail: {
+                  blockType,
+                  tool: tool.id,
+                  inputPath: projection.path.join('.'),
+                  failure: toError(error).name,
+                },
+              })
             }
             continue
           }

apps/sim/executor/utils/resolved-secret-trace-registry.test.ts

@@ -1574,6 +1574,57 @@ describe('incompleteness diagnostics', () => {
     )
   })
 
+  /**
+   * `reason` says what tripped; without this the line says nothing about where, which is the
+   * difference between a signal you can act on and one you can only count.
+   */
+  it('carries a caller-supplied structural detail onto the reported line', () => {
+    const registry = new ResolvedSecretTraceRegistry([], scope)
+
+    registry.markIncomplete('structural-input-root-unprojected', {
+      detail: { blockType: 'api', tool: 'http_request', inputPath: 'body.payload' },
+    })
+
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      'Resolved secret registry marked incomplete',
+      expect.objectContaining({
+        reason: 'structural-input-root-unprojected',
+        blockType: 'api',
+        tool: 'http_request',
+        inputPath: 'body.payload',
+      })
+    )
+  })
+
+  /** A detail key must never displace the fields every one of these lines is read by. */
+  /**
+   * The detail type names its fields, so none of these is expressible without a cast. The runtime
+   * guarantee is asserted anyway because the payload is assembled in two places — `reason` is
+   * added a level above, where the caller's spread order cannot reach it — and a line whose
+   * `reason` disagrees with the level it was logged at is worse than one carrying no detail.
+   */
+  it('does not let a detail shadow the canonical fields', () => {
+    const registry = new ResolvedSecretTraceRegistry([], scope)
+
+    registry.markIncomplete('structural-input-root-unprojected', {
+      detail: {
+        reason: 'spoofed',
+        origin: 'spoofed',
+        scopeWorkspaceId: 'spoofed',
+        activeEntryCount: 'spoofed',
+      } as never,
+    })
+
+    expect(mockLogger.error).toHaveBeenCalledWith(
+      'Resolved secret registry marked incomplete',
+      expect.objectContaining({
+        reason: 'structural-input-root-unprojected',
+        scopeWorkspaceId: 'workspace-1',
+        activeEntryCount: 0,
+      })
+    )
+  })
+
   it('names the guard that tripped rather than reporting unspecified', () => {
     const registry = new ResolvedSecretTraceRegistry([], scope)
 

apps/sim/executor/utils/resolved-secret-trace-registry.ts

@@ -141,8 +141,13 @@ function reportIncompleteness(
   details: Record<string, unknown>
 ): void {
   if (BY_DESIGN_INCOMPLETENESS_REASONS.has(reason)) return
-  if (ORIGINATING_FAULT_REASONS.has(reason)) logger.error(message, { reason, ...details })
-  else logger.warn(message, { reason, ...details })
+  /**
+   * `reason` is written last so no detail can displace it. It is the field these lines are
+   * queried and alerted on, and it also selects the level above — a payload whose `reason` says
+   * one thing while the level was chosen from another is worse than no detail at all.
+   */
+  if (ORIGINATING_FAULT_REASONS.has(reason)) logger.error(message, { ...details, reason })
+  else logger.warn(message, { ...details, reason })
 }
 
 /**
@@ -300,6 +305,32 @@ interface MarkIncompleteContext {
    * production latch naming no guard at all.
    */
   origin?: string
+  detail?: MarkIncompleteDetail
+}
+
+/**
+ * Structural facts locating where a guard tripped. `reason` says what went wrong and this says
+ * where, which is the difference between a line you can act on and one you can only count.
+ *
+ * Named fields rather than an open record, for the reason `reason` itself is a closed union: a
+ * shape a caller can extend freely cannot be aggregated, and — because these merge into the
+ * reported payload — an open record also lets a caller land a key that a reader takes to mean
+ * something else, `origin` and `reason` being the two that carry the most weight here.
+ *
+ * Names and types only — never a value, and never a caught error's message. Code that throws while
+ * coercing an input routinely quotes that input back (`JSON.parse` names the text it rejected), and
+ * an input reaching one of these guards may still hold a resolved secret. That is the same promise
+ * `reason` already makes about this log, restated where it is easy to break.
+ */
+interface MarkIncompleteDetail {
+  /** Block type id, e.g. `api`. */
+  blockType?: string
+  /** Tool id, e.g. `http_request`. */
+  tool?: string
+  /** Dotted input path within the block's inputs, e.g. `body.payload`. */
+  inputPath?: string
+  /** Error class only, e.g. `SyntaxError` — never the thrown message. */
+  failure?: string
 }
 
 export interface ImportResolvedSecretTraceProvenanceOptions {
@@ -1817,6 +1848,8 @@ export class ResolvedSecretTraceRegistry {
     this.modelEgressRevision += 1
     if (this.staged) return
     reportIncompleteness('Resolved secret registry marked incomplete', reason, {
+      /** Spread first so a caller's detail can never shadow the fields every line is read by. */
+      ...(context.detail ?? {}),
       ...(context.origin ? { origin: context.origin } : {}),
       scopeWorkspaceId: this.scope?.workspaceId,
       activeEntryCount: this.activeEntries.size,