diff --git a/CHANGELOG.md b/CHANGELOG.md
index c36a63920c..f23f929847 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ _In development — bullets added per PR; finalized at release._
 ### ✨ New Features
 
 - **feat(mcp): `omniroute_tool_search` tool + one-line TS signatures** — new MCP tool that does lexical keyword search over every MCP tool's name/description and returns the top matches as compact one-line TypeScript signatures (~half the JSON-schema token cost), so agents discover tools on demand instead of carrying all ~88 schemas every turn. Search is ReDoS-safe (substring scoring, never `new RegExp` on the query) and deterministic; `tools/list` stays complete (no hidden tools). Adds the `read:tools` scope. Tier-1 item of the compression feature-extraction roadmap. ([#5269](https://github.com/diegosouzapw/OmniRoute/pull/5269))
+- **feat(compression): RTK semantic command-output renderers (opt-in)** — adds a second, opt-in compaction layer to the RTK engine that rewrites structured command output into a far more compact semantic form: `git diff` → file headers + `@@` hunks + changed lines only; an all-green `pytest`/`jest`/`vitest`/`eslint` run → its one-line summary; `terraform`/`tofu plan` → `Plan: +N ~M -K` plus the resource list; `kubectl`/`aws` JSON arrays → a minimal table. Each renderer is conservative (no-op when the shape doesn't match) and the integration is fail-open; the test-green renderer never collapses output that carries any failure signal. Gated by `RtkConfig.enableRenderers` (default off → zero behavioral change). Eighth item of the compression feature-extraction roadmap. ([#5268](https://github.com/diegosouzapw/OmniRoute/pull/5268))
 - **kilocode:** anonymous (no-auth) access to Kilo Code's free models, mirroring the `opencode`/`mimocode` pattern. With no Kilo account connected, requests now fall back to the gateway's anonymous tier (`Authorization: Bearer anonymous` on `api.kilo.ai/api/openrouter`) so the free models work without signup; a connected OAuth account is still used unchanged for the paid tier (#4019 — thanks @Theadd for the reference implementation)
 
 ### 🔧 Bug Fixes
diff --git a/open-sse/services/compression/engines/rtk/configSchema.ts b/open-sse/services/compression/engines/rtk/configSchema.ts
new file mode 100644
index 0000000000..e7699120e3
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/configSchema.ts
@@ -0,0 +1,117 @@
+import { DEFAULT_RTK_CONFIG } from "../../types.ts";
+import type { EngineConfigField, EngineValidationResult } from "../types.ts";
+
+export const RTK_SCHEMA: EngineConfigField[] = [
+  {
+    key: "intensity",
+    type: "select",
+    label: "Intensity",
+    defaultValue: DEFAULT_RTK_CONFIG.intensity,
+    options: [
+      { value: "minimal", label: "minimal" },
+      { value: "standard", label: "standard" },
+      { value: "aggressive", label: "aggressive" },
+    ],
+  },
+  {
+    key: "applyToToolResults",
+    type: "boolean",
+    label: "Apply to tool results",
+    defaultValue: DEFAULT_RTK_CONFIG.applyToToolResults,
+  },
+  {
+    key: "applyToAssistantMessages",
+    type: "boolean",
+    label: "Apply to assistant messages",
+    defaultValue: DEFAULT_RTK_CONFIG.applyToAssistantMessages,
+  },
+  {
+    key: "applyToCodeBlocks",
+    type: "boolean",
+    label: "Apply to code blocks",
+    defaultValue: DEFAULT_RTK_CONFIG.applyToCodeBlocks,
+  },
+  {
+    key: "maxLinesPerResult",
+    type: "number",
+    label: "Max lines per result",
+    defaultValue: DEFAULT_RTK_CONFIG.maxLinesPerResult,
+    min: 0,
+    max: 5000,
+  },
+  {
+    key: "maxCharsPerResult",
+    type: "number",
+    label: "Max chars per result",
+    defaultValue: DEFAULT_RTK_CONFIG.maxCharsPerResult,
+    min: 0,
+    max: 500000,
+  },
+  {
+    key: "deduplicateThreshold",
+    type: "number",
+    label: "Deduplicate threshold",
+    defaultValue: DEFAULT_RTK_CONFIG.deduplicateThreshold,
+    min: 2,
+    max: 100,
+  },
+  {
+    key: "rawOutputRetention",
+    type: "select",
+    label: "Raw output retention",
+    defaultValue: DEFAULT_RTK_CONFIG.rawOutputRetention,
+    options: [
+      { value: "never", label: "never" },
+      { value: "failures", label: "failures" },
+      { value: "always", label: "always" },
+    ],
+  },
+  {
+    key: "enableRenderers",
+    type: "boolean",
+    label: "Semantic renderers",
+    defaultValue: DEFAULT_RTK_CONFIG.enableRenderers,
+  },
+];
+
+export function validateRtkEngineConfig(config: Record<string, unknown>): EngineValidationResult {
+  const errors: string[] = [];
+  if (
+    config.intensity !== undefined &&
+    config.intensity !== "minimal" &&
+    config.intensity !== "standard" &&
+    config.intensity !== "aggressive"
+  ) {
+    errors.push("intensity must be minimal, standard, or aggressive");
+  }
+  for (const key of [
+    "enabled",
+    "applyToToolResults",
+    "applyToAssistantMessages",
+    "applyToCodeBlocks",
+  ]) {
+    if (config[key] !== undefined && typeof config[key] !== "boolean") {
+      errors.push(`${key} must be a boolean`);
+    }
+  }
+  for (const key of ["maxLinesPerResult", "maxCharsPerResult", "deduplicateThreshold"]) {
+    if (config[key] !== undefined && (typeof config[key] !== "number" || config[key] < 0)) {
+      errors.push(`${key} must be a non-negative number`);
+    }
+  }
+  if (config.enabledFilters !== undefined && !Array.isArray(config.enabledFilters)) {
+    errors.push("enabledFilters must be an array");
+  }
+  if (config.disabledFilters !== undefined && !Array.isArray(config.disabledFilters)) {
+    errors.push("disabledFilters must be an array");
+  }
+  if (
+    config.rawOutputRetention !== undefined &&
+    config.rawOutputRetention !== "never" &&
+    config.rawOutputRetention !== "failures" &&
+    config.rawOutputRetention !== "always"
+  ) {
+    errors.push("rawOutputRetention must be never, failures, or always");
+  }
+  return { valid: errors.length === 0, errors };
+}
diff --git a/open-sse/services/compression/engines/rtk/index.ts b/open-sse/services/compression/engines/rtk/index.ts
index 2912ce2ce4..0d34980043 100644
--- a/open-sse/services/compression/engines/rtk/index.ts
+++ b/open-sse/services/compression/engines/rtk/index.ts
@@ -1,7 +1,8 @@
 import { createCompressionStats, estimateCompressionTokens } from "../../stats.ts";
 import { DEFAULT_RTK_CONFIG, type CompressionResult, type RtkConfig } from "../../types.ts";
-import type { CompressionEngine, EngineConfigField, EngineValidationResult } from "../types.ts";
+import type { CompressionEngine } from "../types.ts";
 import { detectCommandType } from "./commandDetector.ts";
+import { RTK_SCHEMA, validateRtkEngineConfig } from "./configSchema.ts";
 import { deduplicateRepeatedLines } from "./deduplicator.ts";
 import { groupSimilarLines } from "./grouper.ts";
 import { matchRtkFilter } from "./filterLoader.ts";
@@ -9,6 +10,7 @@ import { applyLineFilter } from "./lineFilter.ts";
 import { smartTruncate } from "./smartTruncate.ts";
 import { normalizeCodeLanguage, stripCode } from "./codeStripper.ts";
 import { maybePersistRtkRawOutput, type RtkRawOutputPointer } from "./rawOutput.ts";
+import { applyRenderer } from "./renderers/index.ts";
 import { isTextBlock } from "../../messageContent.ts";
 import { adaptBodyForCompression } from "../../bodyAdapter.ts";
 import { isAnthropicToolResultBlock } from "../../toolResultCompressor.ts";
@@ -62,115 +64,6 @@ function resolveToolMeta(
   return { command: null, skipFilters: true };
 }
 
-const RTK_SCHEMA: EngineConfigField[] = [
-  {
-    key: "intensity",
-    type: "select",
-    label: "Intensity",
-    defaultValue: DEFAULT_RTK_CONFIG.intensity,
-    options: [
-      { value: "minimal", label: "minimal" },
-      { value: "standard", label: "standard" },
-      { value: "aggressive", label: "aggressive" },
-    ],
-  },
-  {
-    key: "applyToToolResults",
-    type: "boolean",
-    label: "Apply to tool results",
-    defaultValue: DEFAULT_RTK_CONFIG.applyToToolResults,
-  },
-  {
-    key: "applyToAssistantMessages",
-    type: "boolean",
-    label: "Apply to assistant messages",
-    defaultValue: DEFAULT_RTK_CONFIG.applyToAssistantMessages,
-  },
-  {
-    key: "applyToCodeBlocks",
-    type: "boolean",
-    label: "Apply to code blocks",
-    defaultValue: DEFAULT_RTK_CONFIG.applyToCodeBlocks,
-  },
-  {
-    key: "maxLinesPerResult",
-    type: "number",
-    label: "Max lines per result",
-    defaultValue: DEFAULT_RTK_CONFIG.maxLinesPerResult,
-    min: 0,
-    max: 5000,
-  },
-  {
-    key: "maxCharsPerResult",
-    type: "number",
-    label: "Max chars per result",
-    defaultValue: DEFAULT_RTK_CONFIG.maxCharsPerResult,
-    min: 0,
-    max: 500000,
-  },
-  {
-    key: "deduplicateThreshold",
-    type: "number",
-    label: "Deduplicate threshold",
-    defaultValue: DEFAULT_RTK_CONFIG.deduplicateThreshold,
-    min: 2,
-    max: 100,
-  },
-  {
-    key: "rawOutputRetention",
-    type: "select",
-    label: "Raw output retention",
-    defaultValue: DEFAULT_RTK_CONFIG.rawOutputRetention,
-    options: [
-      { value: "never", label: "never" },
-      { value: "failures", label: "failures" },
-      { value: "always", label: "always" },
-    ],
-  },
-];
-
-function validateRtkEngineConfig(config: Record<string, unknown>): EngineValidationResult {
-  const errors: string[] = [];
-  if (
-    config.intensity !== undefined &&
-    config.intensity !== "minimal" &&
-    config.intensity !== "standard" &&
-    config.intensity !== "aggressive"
-  ) {
-    errors.push("intensity must be minimal, standard, or aggressive");
-  }
-  for (const key of [
-    "enabled",
-    "applyToToolResults",
-    "applyToAssistantMessages",
-    "applyToCodeBlocks",
-  ]) {
-    if (config[key] !== undefined && typeof config[key] !== "boolean") {
-      errors.push(`${key} must be a boolean`);
-    }
-  }
-  for (const key of ["maxLinesPerResult", "maxCharsPerResult", "deduplicateThreshold"]) {
-    if (config[key] !== undefined && (typeof config[key] !== "number" || config[key] < 0)) {
-      errors.push(`${key} must be a non-negative number`);
-    }
-  }
-  if (config.enabledFilters !== undefined && !Array.isArray(config.enabledFilters)) {
-    errors.push("enabledFilters must be an array");
-  }
-  if (config.disabledFilters !== undefined && !Array.isArray(config.disabledFilters)) {
-    errors.push("disabledFilters must be an array");
-  }
-  if (
-    config.rawOutputRetention !== undefined &&
-    config.rawOutputRetention !== "never" &&
-    config.rawOutputRetention !== "failures" &&
-    config.rawOutputRetention !== "always"
-  ) {
-    errors.push("rawOutputRetention must be never, failures, or always");
-  }
-  return { valid: errors.length === 0, errors };
-}
-
 export interface RtkProcessResult {
   text: string;
   compressed: boolean;
@@ -366,6 +259,20 @@ export function processRtkText(
     }
   }
 
+  // #10: semantic renderers — opt-in via enableRenderers flag (default OFF), fail-open
+  if (config.enableRenderers) {
+    try {
+      const rendered = applyRenderer(result, detection, config);
+      if (rendered.changed) {
+        result = rendered.text;
+        techniquesUsed.push(`rtk-render:${rendered.renderer}`);
+        rulesApplied.push(`rtk:render:${rendered.renderer}`);
+      }
+    } catch {
+      // fail-open: renderer never brings down the request
+    }
+  }
+
   if (config.applyToCodeBlocks) {
     let strippedCodeBlocks = 0;
     result = result.replace(
diff --git a/open-sse/services/compression/engines/rtk/renderers/gitDiff.ts b/open-sse/services/compression/engines/rtk/renderers/gitDiff.ts
new file mode 100644
index 0000000000..3c07c23faf
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/renderers/gitDiff.ts
@@ -0,0 +1,39 @@
+import type { RenderResult, CommandDetectionResult } from "./types.ts";
+import { NO_RENDER } from "./types.ts";
+
+/**
+ * RTK semantic renderer for `git diff` / `git show` output.
+ *
+ * Keeps only:
+ *  - `diff --git a/... b/...` file header lines
+ *  - `@@ ... @@` hunk headers
+ *  - change lines starting with `+` or `-` (but NOT `+++`/`---`)
+ *
+ * Everything else (context lines, index lines, mode lines, etc.) is dropped.
+ * If no hunk header is found, returns no-op (input is not a real diff).
+ */
+export function renderGitDiff(text: string, _detection: CommandDetectionResult): RenderResult {
+  // Guard: must have at least one hunk header
+  if (!text.includes("@@ ")) {
+    return NO_RENDER(text);
+  }
+
+  const kept: string[] = [];
+  for (const line of text.split("\n")) {
+    if (
+      line.startsWith("diff --git ") ||
+      line.startsWith("@@ ")
+    ) {
+      kept.push(line);
+    } else if (/^[+-](?![+-])/.test(line)) {
+      // change line (+foo or -foo) but NOT +++ or ---
+      kept.push(line);
+    }
+    // drop: context lines (space), index lines, --- a/, +++ b/, mode lines, etc.
+  }
+
+  const out = kept.join("\n");
+  if (out === text) return NO_RENDER(text);
+
+  return { text: out, changed: true, renderer: "git-diff" };
+}
diff --git a/open-sse/services/compression/engines/rtk/renderers/index.ts b/open-sse/services/compression/engines/rtk/renderers/index.ts
new file mode 100644
index 0000000000..ad30e9d1ad
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/renderers/index.ts
@@ -0,0 +1,50 @@
+import type { CommandDetectionResult } from "../commandDetector.ts";
+import type { RtkConfig } from "../../../types.ts";
+import { type RenderResult, NO_RENDER } from "./types.ts";
+import { renderGitDiff } from "./gitDiff.ts";
+import { renderTestGreen } from "./testGreen.ts";
+import { renderTerraformPlan } from "./terraformPlan.ts";
+import { renderStructuredTable } from "./structuredTable.ts";
+
+// preenchido nas tasks 2–5
+const REGISTRY: Record<string, (text: string, d: CommandDetectionResult) => RenderResult> = {};
+
+// Task 2: git-diff renderer
+// Note: "git-show" is not a real detection type in commandDetector.ts DETECTORS array,
+// so only "git-diff" is registered here.
+REGISTRY["git-diff"] = renderGitDiff;
+
+// Task 3: test-green renderer
+// Note: "test-eslint" is not a real detection type; the real type is "build-eslint".
+REGISTRY["test-pytest"] = renderTestGreen;
+REGISTRY["test-jest"] = renderTestGreen;
+REGISTRY["test-vitest"] = renderTestGreen;
+REGISTRY["build-eslint"] = renderTestGreen;
+
+// Task 4: terraform-plan renderer
+REGISTRY["terraform-plan"] = renderTerraformPlan;
+REGISTRY["tofu-plan"] = renderTerraformPlan;
+
+// Task 5: structured-table renderer
+// Note: "kubectl" is not a real detection type in commandDetector.ts DETECTORS array
+// (it's in KNOWN_COMMANDS but has no DETECTOR entry with a "kubectl" type).
+// Kubectl JSON output will be detected as "json-output" or "aws" depending on content.
+// Registering "aws" and "json-output" which are the real types for this output shape.
+REGISTRY["aws"] = renderStructuredTable;
+REGISTRY["json-output"] = renderStructuredTable;
+
+export function applyRenderer(
+  text: string,
+  detection: CommandDetectionResult,
+  config: RtkConfig
+): RenderResult {
+  const r = REGISTRY[detection.type];
+  if (!r) return NO_RENDER(text);
+  if (config.renderers && config.renderers.length > 0 && !config.renderers.includes(detection.type)) {
+    return NO_RENDER(text);
+  }
+  return r(text, detection);
+}
+export { type RenderResult } from "./types.ts";
+
+export { REGISTRY };
diff --git a/open-sse/services/compression/engines/rtk/renderers/structuredTable.ts b/open-sse/services/compression/engines/rtk/renderers/structuredTable.ts
new file mode 100644
index 0000000000..0e570c8974
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/renderers/structuredTable.ts
@@ -0,0 +1,96 @@
+import type { RenderResult, CommandDetectionResult } from "./types.ts";
+import { NO_RENDER } from "./types.ts";
+
+const MAX_TABLE_ROWS = 200;
+const MAX_COLUMNS = 5;
+// Priority column names to prefer when choosing which columns to display
+const PRIORITY_KEYS = ["name", "id", "status", "type", "kind"];
+
+/**
+ * RTK semantic renderer for structured JSON array output (aws, kubectl, etc.).
+ *
+ * Only renders if:
+ *  - Input parses as JSON (or contains a JSON array substring)
+ *  - Result is an array of ≥2 homogeneous objects (same dominant scalar keys)
+ *
+ * Output: minimal TSV-like table (header + rows). Large arrays (>200 items)
+ * are capped with a trailing "… (+K more)" line.
+ *
+ * All other shapes ⇒ no-op (conservative).
+ */
+export function renderStructuredTable(
+  text: string,
+  _detection: CommandDetectionResult,
+): RenderResult {
+  const parsed = tryParse(text.trim());
+  if (!parsed) return NO_RENDER(text);
+
+  // Must be an array of ≥2 objects
+  if (!Array.isArray(parsed) || parsed.length < 2) return NO_RENDER(text);
+
+  const items = parsed as unknown[];
+  // Every item must be a non-null, non-array object
+  if (!items.every((item) => item !== null && typeof item === "object" && !Array.isArray(item))) {
+    return NO_RENDER(text);
+  }
+
+  const objects = items as Record<string, unknown>[];
+
+  // Collect scalar keys across all objects, count occurrences
+  const keyCount: Record<string, number> = {};
+  for (const obj of objects) {
+    for (const [k, v] of Object.entries(obj)) {
+      if (v === null || typeof v !== "object") {
+        keyCount[k] = (keyCount[k] ?? 0) + 1;
+      }
+    }
+  }
+
+  if (Object.keys(keyCount).length === 0) return NO_RENDER(text);
+
+  // Choose columns: prioritize PRIORITY_KEYS, then by frequency, cap at MAX_COLUMNS
+  const threshold = Math.floor(objects.length / 2);
+  const candidateKeys = Object.entries(keyCount)
+    .filter(([, count]) => count >= threshold)
+    .map(([k]) => k);
+
+  const priorityChosen = PRIORITY_KEYS.filter((k) => candidateKeys.includes(k));
+  const rest = candidateKeys
+    .filter((k) => !PRIORITY_KEYS.includes(k))
+    .sort((a, b) => (keyCount[b] ?? 0) - (keyCount[a] ?? 0));
+
+  const columns = [...priorityChosen, ...rest].slice(0, MAX_COLUMNS);
+  if (columns.length === 0) return NO_RENDER(text);
+
+  // Build table
+  const rows = objects.slice(0, MAX_TABLE_ROWS);
+  const extra = objects.length > MAX_TABLE_ROWS ? objects.length - MAX_TABLE_ROWS : 0;
+
+  const header = columns.join("\t");
+  const body = rows
+    .map((obj) => columns.map((k) => String(obj[k] ?? "")).join("\t"))
+    .join("\n");
+
+  const out = extra > 0 ? `${header}\n${body}\n… (+${extra} more)` : `${header}\n${body}`;
+
+  return { text: out, changed: true, renderer: "structured-table" };
+}
+
+function tryParse(text: string): unknown {
+  // Direct parse
+  try {
+    return JSON.parse(text);
+  } catch {
+    // Try to find the largest [...] substring
+    const start = text.indexOf("[");
+    const end = text.lastIndexOf("]");
+    if (start !== -1 && end > start) {
+      try {
+        return JSON.parse(text.slice(start, end + 1));
+      } catch {
+        return null;
+      }
+    }
+    return null;
+  }
+}
diff --git a/open-sse/services/compression/engines/rtk/renderers/terraformPlan.ts b/open-sse/services/compression/engines/rtk/renderers/terraformPlan.ts
new file mode 100644
index 0000000000..198018e2ac
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/renderers/terraformPlan.ts
@@ -0,0 +1,40 @@
+import type { RenderResult, CommandDetectionResult } from "./types.ts";
+import { NO_RENDER } from "./types.ts";
+
+/**
+ * RTK semantic renderer for `terraform plan` / `tofu plan` output.
+ *
+ * Extracts:
+ *  - The canonical summary line `Plan: N to add, M to change, K to destroy.`
+ *    reformatted as `Plan: +N ~M -K`
+ *  - Resource lines `# <addr> will be <verb>`
+ *
+ * "No changes." output ⇒ no-op (already short enough).
+ * If no `Plan:` line is found ⇒ no-op (conservative).
+ */
+export function renderTerraformPlan(
+  text: string,
+  _detection: CommandDetectionResult,
+): RenderResult {
+  // "No changes" is already compact — idempotent no-op
+  if (/^No changes\./m.test(text)) return NO_RENDER(text);
+
+  // Extract the canonical Plan summary line
+  const planMatch = text.match(/Plan:\s+(\d+)\s+to add,\s+(\d+)\s+to change,\s+(\d+)\s+to destroy/);
+  if (!planMatch) return NO_RENDER(text);
+
+  const [, add, change, destroy] = planMatch;
+  const summary = `Plan: +${add} ~${change} -${destroy}`;
+
+  // Collect resource address lines: "  # <addr> will be <verb>"
+  const resources: string[] = [];
+  for (const line of text.split("\n")) {
+    const m = line.match(/^\s+#\s+(\S+)\s+will\s+be\s+\S+/);
+    if (m) {
+      resources.push(`  # ${m[1]} will be ${line.trim().replace(/^#\s+\S+\s+will\s+be\s+/, "")}`);
+    }
+  }
+
+  const out = [summary, ...resources].join("\n");
+  return { text: out, changed: true, renderer: "terraform-plan" };
+}
diff --git a/open-sse/services/compression/engines/rtk/renderers/testGreen.ts b/open-sse/services/compression/engines/rtk/renderers/testGreen.ts
new file mode 100644
index 0000000000..18473c9a4b
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/renderers/testGreen.ts
@@ -0,0 +1,70 @@
+import type { RenderResult, CommandDetectionResult } from "./types.ts";
+import { NO_RENDER } from "./types.ts";
+
+/**
+ * RTK semantic renderer for test suite output (pytest, jest, vitest, eslint).
+ *
+ * CRITICAL safety guard: only collapses when output indicates TOTAL success.
+ * ANY sign of failure forces a no-op to preserve full diagnostics.
+ *
+ * Failure signals (force no-op):
+ *  - /\bFAIL\b/ in the text
+ *  - /failed/i paired with a nonzero count (e.g. "1 failed")
+ *  - ✖ symbol
+ *  - "Error" anywhere
+ *  - "Traceback" (Python)
+ *  - "AssertionError"
+ *
+ * When green, extract the summary line and return it.
+ * If no recognizable summary line is found, no-op.
+ */
+export function renderTestGreen(text: string, _detection: CommandDetectionResult): RenderResult {
+  // Strip ANSI color codes before applying the failure guards. jest/vitest emit a
+  // colored "FAIL" status whose preceding ANSI byte ("m" of ) is a word
+  // character, defeating a /\bFAIL\b/ boundary on the raw string. Guards run on the
+  // stripped copy; the original `text` is what we return on a no-op (lossless).
+  const stripped = text.replace(/\[[0-9;]*m/g, "");
+
+  // Failure guard — must check FIRST; never weaken
+  if (/\bFAIL\b/.test(stripped)) return NO_RENDER(text);
+  if (/✖/.test(stripped)) return NO_RENDER(text);
+  if (/Error/.test(stripped)) return NO_RENDER(text);
+  if (/Traceback/.test(stripped)) return NO_RENDER(text);
+  if (/AssertionError/.test(stripped)) return NO_RENDER(text);
+
+  // "failed" with a nonzero count, e.g. "1 failed" or "failed: 3"
+  const failedMatch = stripped.match(/(\d+)\s+failed/i) ?? stripped.match(/failed[:\s]+(\d+)/i);
+  if (failedMatch && parseInt(failedMatch[1], 10) > 0) return NO_RENDER(text);
+
+  // Try to extract a recognised summary line (from the stripped copy → ANSI-free)
+  const summary = extractSummaryLine(stripped);
+  if (!summary) return NO_RENDER(text);
+
+  return { text: summary, changed: true, renderer: "test-green" };
+}
+
+function extractSummaryLine(text: string): string | null {
+  const lines = text.split("\n");
+
+  // pytest: === N passed in X.Xs ===  (also handles variants like  === N passed, M warning ===)
+  for (const line of lines) {
+    if (/={3,}\s+\d+\s+passed/.test(line)) return line.trim();
+  }
+
+  // jest / vitest: "Tests: N passed, N total" or "Test Suites: ... Tests: ..."
+  for (const line of lines) {
+    if (/Tests:\s+\d+\s+passed/.test(line)) return line.trim();
+  }
+
+  // vitest / jest run summary line: "✓ N tests passed"
+  for (const line of lines) {
+    if (/\d+\s+tests?\s+passed/i.test(line)) return line.trim();
+  }
+
+  // eslint / build-eslint: empty output = clean; if we reach here with no failures, synthesize
+  if (text.trim() === "" || text.trim().startsWith("\n")) {
+    return "ESLint: 0 problems found";
+  }
+
+  return null;
+}
diff --git a/open-sse/services/compression/engines/rtk/renderers/types.ts b/open-sse/services/compression/engines/rtk/renderers/types.ts
new file mode 100644
index 0000000000..09709832bc
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/renderers/types.ts
@@ -0,0 +1,13 @@
+import type { CommandDetectionResult } from "../commandDetector.ts";
+import type { RtkConfig } from "../../../types.ts";
+
+export interface RenderResult {
+  text: string;
+  changed: boolean;
+  renderer: string; // nome do renderer aplicado (ou "" se nenhum)
+}
+
+export type Renderer = (text: string, detection: CommandDetectionResult) => RenderResult;
+
+export const NO_RENDER = (text: string): RenderResult => ({ text, changed: false, renderer: "" });
+export type { RtkConfig, CommandDetectionResult };
diff --git a/open-sse/services/compression/types.ts b/open-sse/services/compression/types.ts
index acd20b4617..3836a68f81 100644
--- a/open-sse/services/compression/types.ts
+++ b/open-sse/services/compression/types.ts
@@ -103,6 +103,10 @@ export interface RtkConfig {
   stripCodeComments?: boolean;
   /** R1/N3: keep JSDoc/docstring block comments when removing comments. Default: true. */
   preserveDocstrings?: boolean;
+  /** #10: semantic command-output renderers (default off) */
+  enableRenderers?: boolean;
+  /** #10: whitelist por command-type; vazio/undefined = todos */
+  renderers?: string[];
 }
 
 export interface CompressionLanguageConfig {
@@ -314,6 +318,7 @@ export const DEFAULT_RTK_CONFIG: RtkConfig = {
   groupingThreshold: 3,
   stripCodeComments: false,
   preserveDocstrings: true,
+  enableRenderers: false,
 };
 
 export const DEFAULT_COMPRESSION_LANGUAGE_CONFIG: CompressionLanguageConfig = {
diff --git a/tests/unit/compression/rtk-render-gitdiff.test.ts b/tests/unit/compression/rtk-render-gitdiff.test.ts
new file mode 100644
index 0000000000..1f665e5a80
--- /dev/null
+++ b/tests/unit/compression/rtk-render-gitdiff.test.ts
@@ -0,0 +1,36 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { renderGitDiff } from "../../../open-sse/services/compression/engines/rtk/renderers/gitDiff.ts";
+
+const det = {
+  type: "git-diff",
+  command: "git diff",
+  confidence: 1,
+  category: "git",
+  matchedPatterns: [],
+};
+
+test("keeps file headers, hunks and +/- changes; drops context", () => {
+  const input = `diff --git a/x.ts b/x.ts
+index 111..222 100644
+--- a/x.ts
++++ b/x.ts
+@@ -1,3 +1,3 @@
+-const a = 1;
++const a = 2;
+ const b = 3;`;
+  const r = renderGitDiff(input, det);
+  assert.equal(r.changed, true);
+  assert.ok(r.text.includes("diff --git a/x.ts b/x.ts"));
+  assert.ok(r.text.includes("@@ -1,3 +1,3 @@"));
+  assert.ok(r.text.includes("-const a = 1;"));
+  assert.ok(r.text.includes("+const a = 2;"));
+  assert.ok(!r.text.includes("index 111..222"));
+  assert.ok(!r.text.includes("--- a/x.ts"));
+  assert.ok(!r.text.includes(" const b = 3;")); // contexto dropado
+});
+
+test("no hunks ⇒ no-op", () => {
+  const r = renderGitDiff("just some text\nno diff here", det);
+  assert.equal(r.changed, false);
+});
diff --git a/tests/unit/compression/rtk-render-table.test.ts b/tests/unit/compression/rtk-render-table.test.ts
new file mode 100644
index 0000000000..c67c7c39df
--- /dev/null
+++ b/tests/unit/compression/rtk-render-table.test.ts
@@ -0,0 +1,32 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { renderStructuredTable } from "../../../open-sse/services/compression/engines/rtk/renderers/structuredTable.ts";
+
+const det = {
+  type: "kubectl",
+  command: "kubectl get pods -o json",
+  confidence: 1,
+  category: "cloud",
+  matchedPatterns: [],
+};
+
+test("homogeneous JSON array ⇒ minimal table", () => {
+  const input = JSON.stringify([
+    { name: "pod-a", status: "Running", restarts: 0 },
+    { name: "pod-b", status: "Pending", restarts: 2 },
+  ]);
+  const r = renderStructuredTable(input, det);
+  assert.equal(r.changed, true);
+  assert.ok(r.text.includes("name"));
+  assert.ok(r.text.includes("pod-a"));
+  assert.ok(r.text.includes("Pending"));
+  assert.ok(!r.text.includes('"status":')); // não é mais JSON
+});
+
+test("malformed JSON ⇒ no-op", () => {
+  assert.equal(renderStructuredTable("{not json", det).changed, false);
+});
+
+test("single object (not array) ⇒ no-op", () => {
+  assert.equal(renderStructuredTable('{"name":"x"}', det).changed, false);
+});
diff --git a/tests/unit/compression/rtk-render-terraform.test.ts b/tests/unit/compression/rtk-render-terraform.test.ts
new file mode 100644
index 0000000000..7f88b9d83e
--- /dev/null
+++ b/tests/unit/compression/rtk-render-terraform.test.ts
@@ -0,0 +1,37 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { renderTerraformPlan } from "../../../open-sse/services/compression/engines/rtk/renderers/terraformPlan.ts";
+
+const det = {
+  type: "terraform-plan",
+  command: "terraform plan",
+  confidence: 1,
+  category: "infra",
+  matchedPatterns: [],
+};
+
+test("summarizes plan into +N ~M -K plus resources", () => {
+  const input = `Terraform will perform the following actions:
+  # aws_instance.web will be created
+  + resource "aws_instance" "web" { ... many lines ... }
+  # aws_s3_bucket.data will be updated in-place
+  ~ resource "aws_s3_bucket" "data" { ... }
+Plan: 1 to add, 1 to change, 0 to destroy.`;
+  const r = renderTerraformPlan(input, det);
+  assert.equal(r.changed, true);
+  assert.ok(r.text.includes("Plan: +1 ~1 -0"));
+  assert.ok(r.text.includes("aws_instance.web"));
+  assert.ok(!r.text.includes('resource "aws_instance" "web" {'));
+  // Regression (core review): the verb must not be duplicated ("will be will be created").
+  assert.ok(!r.text.includes("will be will be"));
+  assert.ok(r.text.includes("# aws_instance.web will be created"));
+  assert.ok(r.text.includes("# aws_s3_bucket.data will be updated in-place"));
+});
+
+test("no-changes ⇒ no-op", () => {
+  const r = renderTerraformPlan(
+    "No changes. Your infrastructure matches the configuration.",
+    det,
+  );
+  assert.equal(r.changed, false);
+});
diff --git a/tests/unit/compression/rtk-render-testgreen.test.ts b/tests/unit/compression/rtk-render-testgreen.test.ts
new file mode 100644
index 0000000000..9900b3c160
--- /dev/null
+++ b/tests/unit/compression/rtk-render-testgreen.test.ts
@@ -0,0 +1,40 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { renderTestGreen } from "../../../open-sse/services/compression/engines/rtk/renderers/testGreen.ts";
+
+const det = (t: string) => ({
+  type: t,
+  command: "",
+  confidence: 1,
+  category: "test",
+  matchedPatterns: [],
+});
+
+test("pytest all-green collapses to summary", () => {
+  const input = `============ test session starts ============
+collected 142 items
+tests/a.py ....................
+tests/b.py ....................
+============ 142 passed in 3.21s ============`;
+  const r = renderTestGreen(input, det("test-pytest"));
+  assert.equal(r.changed, true);
+  assert.ok(r.text.includes("142 passed"));
+  assert.ok(!r.text.includes("...................."));
+});
+
+test("any failure ⇒ no-op (preserve diagnostics)", () => {
+  const input = `tests/a.py ..F..
+=== 1 failed, 4 passed in 1.0s ===
+E   AssertionError: nope`;
+  const r = renderTestGreen(input, det("test-pytest"));
+  assert.equal(r.changed, false);
+});
+
+test("ANSI-colored FAIL with no numeric failed-count ⇒ no-op (regression: \\bFAIL\\b defeated by ANSI)", () => {
+  // jest/vitest emit a colored FAIL header; the ESC[31m byte 'm' before 'F' kills the
+  // word boundary. With the per-test failed-count line already stripped by an upstream
+  // filter, the ANSI strip in the guard is the only thing preventing a collapsed failure.
+  const input = "FAIL src/auth.test.ts\nTests: 3 passed, 3 total";
+  const r = renderTestGreen(input, det("test-jest"));
+  assert.equal(r.changed, false);
+});
diff --git a/tests/unit/compression/rtk-renderers-integration.test.ts b/tests/unit/compression/rtk-renderers-integration.test.ts
new file mode 100644
index 0000000000..5105715800
--- /dev/null
+++ b/tests/unit/compression/rtk-renderers-integration.test.ts
@@ -0,0 +1,43 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { processRtkText } from "../../../open-sse/services/compression/engines/rtk/index.ts";
+import { applyRenderer } from "../../../open-sse/services/compression/engines/rtk/renderers/index.ts"; // sanity import
+
+// keep unused import check quiet
+void applyRenderer;
+
+const GIT_DIFF = `diff --git a/x.ts b/x.ts
+index 111..222 100644
+--- a/x.ts
++++ b/x.ts
+@@ -1,3 +1,3 @@
+-const a = 1;
++const a = 2;
+ const b = 3;`;
+
+test("enableRenderers default false ⇒ baseline unchanged", () => {
+  const off = processRtkText(GIT_DIFF, { command: "git diff", config: { enabled: true } });
+  const explicitOff = processRtkText(GIT_DIFF, {
+    command: "git diff",
+    config: { enabled: true, enableRenderers: false },
+  });
+  assert.equal(off.text, explicitOff.text); // renderer não roda por default
+});
+
+test("enableRenderers true ⇒ git diff is rendered through processRtkText", () => {
+  const on = processRtkText(GIT_DIFF, {
+    command: "git diff",
+    config: { enabled: true, enableRenderers: true },
+  });
+  assert.ok(on.techniquesUsed.includes("rtk-render:git-diff"));
+  assert.ok(!on.text.includes("index ")); // contexto/metadata dropado
+});
+
+test("fail-open: renderer error keeps prior result", () => {
+  // entrada que detecta git-diff mas é benigna; renderer não deve lançar nem alterar incorretamente
+  const r = processRtkText("not really a diff", {
+    command: "git diff",
+    config: { enabled: true, enableRenderers: true },
+  });
+  assert.ok(typeof r.text === "string"); // nunca lança
+});