diff --git a/report-app/src/app/pages/report-viewer/report-viewer.html b/report-app/src/app/pages/report-viewer/report-viewer.html
index b035275..d92d18d 100644
--- a/report-app/src/app/pages/report-viewer/report-viewer.html
+++ b/report-app/src/app/pages/report-viewer/report-viewer.html
@@ -225,6 +225,18 @@ <h4>Repair System Prompt</h4>
       </expansion-panel>
     }
 
+    @if (report.details.summary.additionalAiAnalysis !== undefined) {
+      @for (item of report.details.summary.additionalAiAnalysis; track item) {
+        <expansion-panel size="large" class="root-section">
+          <expansion-panel-header>
+            <img src="gemini.webp" alt="Gemini Logo" height="30" width="30" />
+            {{item.name}}
+          </expansion-panel-header>
+          <div [innerHTML]="item.summary"></div>
+        </expansion-panel>
+      }
+    }
+
     @if (missingDeps().length > 0) {
       <expansion-panel size="large" class="root-section">
         <expansion-panel-header>
diff --git a/runner/configuration/environment-config.ts b/runner/configuration/environment-config.ts
index 49d35a2..ab7ef39 100644
--- a/runner/configuration/environment-config.ts
+++ b/runner/configuration/environment-config.ts
@@ -8,6 +8,7 @@ import {
   LocalExecutorConfig,
   localExecutorConfigSchema,
 } from '../orchestration/executors/local-executor-config.js';
+import {RatingContextFilter, ReportContextFilter} from '../shared-interfaces.js';
 
 export const environmentConfigSchema = z.object({
   /** Display name for the environment. */
@@ -98,6 +99,24 @@ export const environmentConfigSchema = z.object({
    * It's useful to ensure that the set of ratings hasn't changed between two runs.
    */
   expectedRatingHash: z.string().optional(),
+
+  /**
+   * Prompts to use when for additional analysis of the eval results.
+   */
+  analysisPrompts: z
+    .array(
+      z.object({
+        name: z.string(),
+        path: z.string(),
+        reportsFilter: z
+          .enum([ReportContextFilter.AllReports, ReportContextFilter.NonPerfectReports])
+          .optional(),
+        ratingsFilter: z
+          .enum([RatingContextFilter.AllRatings, RatingContextFilter.NonPerfectRatings])
+          .optional(),
+      }),
+    )
+    .optional(),
 });
 
 /**
diff --git a/runner/configuration/environment.ts b/runner/configuration/environment.ts
index 02aa0aa..c6abbc3 100644
--- a/runner/configuration/environment.ts
+++ b/runner/configuration/environment.ts
@@ -7,6 +7,8 @@ import {
   FrameworkInfo,
   MultiStepPromptDefinition,
   PromptDefinition,
+  RatingContextFilter,
+  ReportContextFilter,
   RootPromptDefinition,
 } from '../shared-interfaces.js';
 import {UserFacingError} from '../utils/errors.js';
@@ -22,6 +24,13 @@ interface CategoryConfig {
   maxPoints: number;
 }
 
+interface AnalysisPrompt {
+  name: string;
+  prompt: string;
+  reportsFilter: ReportContextFilter;
+  ratingsFilter: RatingContextFilter;
+}
+
 /** Represents a single prompt evaluation environment. */
 export class Environment {
   /** Path at which the environment is defined. */
@@ -56,6 +65,9 @@ export class Environment {
    */
   readonly ratingHash: string;
 
+  /** Additional analysis prompts defined by the user. */
+  readonly analysisPrompts: AnalysisPrompt[];
+
   /** Ratings configured at the environment level. */
   private readonly ratings: Rating[];
 
@@ -88,6 +100,7 @@ export class Environment {
     this.ratingCategories = this.getRatingCategories(config);
     this.ratings = this.resolveRatings(config);
     this.ratingHash = this.getRatingHash(this.ratings, this.ratingCategories);
+    this.analysisPrompts = this.resolveAnalysisPrompts(config);
     this.validateRatingHash(this.ratingHash, config);
   }
 
@@ -262,7 +275,7 @@ export class Environment {
     isEditing: boolean,
     metadata: Metadata,
   ): Promise<PromptDefinition<Metadata>> {
-    const {result, contextFiles} = await this.renderEnvironmentPrompt(relativePath);
+    const {result, contextFiles} = this.renderEnvironmentPrompt(relativePath);
 
     return {
       name: name,
@@ -360,13 +373,13 @@ export class Environment {
   }
 
   /** Renders a prompt from a path relative to the environment config. */
-  private async renderEnvironmentPrompt(relativePath: string) {
+  private renderEnvironmentPrompt(relativePath: string) {
     const path = resolve(this.rootPath, relativePath);
     return this.renderPrompt(readFileSync(path, 'utf8'), path);
   }
 
   private async renderSystemPrompt(relativePath: string) {
-    const result = await this.renderEnvironmentPrompt(relativePath);
+    const result = this.renderEnvironmentPrompt(relativePath);
 
     // Optional hooks for post processing environment system prompts. Useful for e.g.
     // supporting `@` references from Gemini CLI or inside g3.
@@ -446,4 +459,21 @@ export class Environment {
       );
     }
   }
+
+  private resolveAnalysisPrompts(config: EnvironmentConfig): AnalysisPrompt[] {
+    const result: AnalysisPrompt[] = [];
+
+    config.analysisPrompts?.forEach(({name, path, reportsFilter, ratingsFilter}) => {
+      const prompt = this.renderEnvironmentPrompt(path).result;
+
+      result.push({
+        name,
+        prompt,
+        reportsFilter: reportsFilter ?? ReportContextFilter.NonPerfectReports,
+        ratingsFilter: ratingsFilter ?? RatingContextFilter.NonPerfectRatings,
+      });
+    });
+
+    return result;
+  }
 }
diff --git a/runner/orchestration/generate-summary.ts b/runner/orchestration/generate-summary.ts
index 935ba65..27ba1d0 100644
--- a/runner/orchestration/generate-summary.ts
+++ b/runner/orchestration/generate-summary.ts
@@ -1,6 +1,7 @@
 import {GenkitRunner} from '../codegen/genkit/genkit-runner.js';
 import {Environment} from '../configuration/environment.js';
 import {redX} from '../reporting/format.js';
+import {chatWithReportAI} from '../reporting/report-ai-chat.js';
 import {summarizeReportWithAI} from '../reporting/report-ai-summary.js';
 import {AssessmentResult, CompletionStats, RunSummary} from '../shared-interfaces.js';
 
@@ -43,7 +44,7 @@ export async function prepareSummary(
 
   let aiSummary: string | undefined = undefined;
   if (generateAiSummaryLlm) {
-    console.log(`✨ Generating AI summary for evaluation run..`);
+    console.log(`✨ Generating AI summary for evaluation run...`);
     try {
       const result = await summarizeReportWithAI(generateAiSummaryLlm, abortSignal, assessments);
       inputTokens += result.usage.inputTokens;
@@ -61,6 +62,42 @@ export async function prepareSummary(
     }
   }
 
+  const additionalAiAnalysis: {name: string; summary: string}[] = [];
+  if (generateAiSummaryLlm && env.analysisPrompts.length > 0) {
+    console.log(`✨ Generating additional AI analysis...`);
+
+    await Promise.all(
+      env.analysisPrompts.map(async config => {
+        try {
+          const result = await chatWithReportAI(
+            generateAiSummaryLlm,
+            config.prompt,
+            abortSignal,
+            assessments,
+            [],
+            model,
+            {
+              reportContextFilter: config.reportsFilter,
+              ratingContextFilter: config.ratingsFilter,
+            },
+            undefined,
+          );
+          inputTokens += result.usage.inputTokens;
+          outputTokens += result.usage.outputTokens;
+          thinkingTokens += result.usage.thinkingTokens;
+          totalTokens += result.usage.totalTokens;
+          additionalAiAnalysis.push({name: config.name, summary: result.responseHtml});
+        } catch (e) {
+          console.log(`${redX()} Failed custom analysis called "${config.name}".`);
+
+          if (process.env.DEBUG === '1' && (e as Partial<Error>).stack) {
+            console.error((e as Error).stack);
+          }
+        }
+      }),
+    );
+  }
+
   const executorInfo = await env.executor.getExecutorInfo?.();
 
   return {
@@ -78,6 +115,7 @@ export async function prepareSummary(
       },
     },
     aiSummary,
+    additionalAiAnalysis,
     completionStats: completionStats,
     usage: {
       inputTokens,
diff --git a/runner/reporting/report-ai-chat.ts b/runner/reporting/report-ai-chat.ts
index 53c1ec6..8c10218 100644
--- a/runner/reporting/report-ai-chat.ts
+++ b/runner/reporting/report-ai-chat.ts
@@ -87,7 +87,7 @@ ${serializeReportForPrompt(assessmentsToProcess, contextFilters)}
       includeThoughts: false,
     },
     timeout: {
-      description: `Generating summary for report`,
+      description: `Chatting with AI`,
       durationInMins: 3,
     },
     abortSignal,
diff --git a/runner/shared-interfaces.ts b/runner/shared-interfaces.ts
index c83dda1..ae510f3 100644
--- a/runner/shared-interfaces.ts
+++ b/runner/shared-interfaces.ts
@@ -437,6 +437,8 @@ export interface RunSummary {
   completionStats?: CompletionStats;
   /** AI summary (as HTML code) of all assessments in this run/report. */
   aiSummary?: string;
+  /** Additional user-defined AI analysis. */
+  additionalAiAnalysis?: {name: string; summary: string}[];
   /**
    * Information about the runner that was used for the eval.
    * Optional since some older reports might not have it.