diff --git a/open-sse/services/compression/engines/rtk/commandDetector.ts b/open-sse/services/compression/engines/rtk/commandDetector.ts
index 31806c65b7..07207c2c3b 100644
--- a/open-sse/services/compression/engines/rtk/commandDetector.ts
+++ b/open-sse/services/compression/engines/rtk/commandDetector.ts
@@ -55,6 +55,9 @@ const COMMAND_PREFIXES = [
   "golangci-lint",
   "bundle",
   "rubocop",
+  "kubectl",
+  "composer",
+  "gh",
   "docker",
   "aws",
   "gcloud",
diff --git a/open-sse/services/compression/engines/rtk/filters/composer.json b/open-sse/services/compression/engines/rtk/filters/composer.json
new file mode 100644
index 0000000000..1391699634
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/filters/composer.json
@@ -0,0 +1,81 @@
+{
+  "id": "composer",
+  "label": "Composer (PHP)",
+  "description": "Keep Composer install/update results, warnings, and dependency errors.",
+  "category": "package",
+  "priority": 65,
+  "match": {
+    "outputTypes": ["composer"],
+    "commands": [
+      "^composer\\s+(?:install|update|require|remove|dump-autoload|outdated)\\b",
+      "^php\\s+composer(?:\\.phar)?\\s+(?:install|update|require)\\b"
+    ],
+    "patterns": [
+      "Package operations: \\d+ install",
+      "Generating (?:optimized )?autoload files",
+      "Your requirements could not be resolved",
+      "Problem \\d+",
+      "vulnerabilities found"
+    ]
+  },
+  "rules": {
+    "stripAnsi": true,
+    "includePatterns": [
+      "Package operations: \\d+",
+      "Generating (?:optimized )?autoload files",
+      "Your requirements could not be resolved",
+      "Problem \\d+",
+      "vulnerabilities found",
+      "WARNING",
+      "ERROR",
+      "Could not (?:find|resolve|delete)",
+      "conflicts with",
+      "requires .+ but",
+      "- (?:Installing|Updating|Removing) \\S+",
+      "PHP Fatal error",
+      "Class .+ not found"
+    ],
+    "dropPatterns": [
+      "^\\s*$",
+      "^Loading composer repositories",
+      "^Updating dependencies",
+      "^Writing lock file",
+      "^Installing dependencies from lock file",
+      "^Downloading \\(\\d+%\\)",
+      "^\\s*-\\s+Downloading"
+    ],
+    "collapsePatterns": ["^\\s*-\\s+Installing"],
+    "deduplicate": true,
+    "maxLines": 100,
+    "headLines": 20,
+    "tailLines": 50
+  },
+  "preserve": {
+    "errorPatterns": [
+      "Your requirements could not be resolved",
+      "Problem \\d+",
+      "ERROR",
+      "PHP Fatal error",
+      "Class .+ not found"
+    ],
+    "summaryPatterns": [
+      "Package operations: \\d+",
+      "Generating (?:optimized )?autoload files",
+      "vulnerabilities found"
+    ]
+  },
+  "tests": [
+    {
+      "name": "successful install",
+      "command": "composer install",
+      "input": "Loading composer repositories with package information\nUpdating dependencies\nLock file operations: 5 installs, 0 updates, 0 removals\n  - Locking laravel/framework (v11.0.0)\nWriting lock file\nInstalling dependencies from lock file (including require-dev)\nPackage operations: 5 installs, 0 updates, 0 removals\n  - Downloading laravel/framework (v11.0.0)\n  - Installing laravel/framework (v11.0.0)\nGenerating optimized autoload files\n",
+      "expected": "Package operations: 5 installs, 0 updates, 0 removals\n  - Installing laravel/framework (v11.0.0)\nGenerating optimized autoload files"
+    },
+    {
+      "name": "dependency conflict",
+      "command": "composer require",
+      "input": "Your requirements could not be resolved to an installable set of packages.\n\n  Problem 1\n    - laravel/framework[v11.0.0] requires php ^8.2 but your php version (8.1.0) does not satisfy that requirement.\n",
+      "expected": "Your requirements could not be resolved to an installable set of packages.\n  Problem 1\n    - laravel/framework[v11.0.0] requires php ^8.2 but your php version (8.1.0) does not satisfy that requirement."
+    }
+  ]
+}
diff --git a/open-sse/services/compression/engines/rtk/filters/docker-build.json b/open-sse/services/compression/engines/rtk/filters/docker-build.json
new file mode 100644
index 0000000000..efdf5452cf
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/filters/docker-build.json
@@ -0,0 +1,78 @@
+{
+  "id": "docker-build",
+  "label": "Docker Build",
+  "description": "Keep Docker build errors and final summary while stripping layer-by-layer progress.",
+  "category": "docker",
+  "priority": 82,
+  "match": {
+    "outputTypes": ["docker-build"],
+    "commands": [
+      "^docker\\s+(?:build|buildx\\s+build)\\b",
+      "^(?:docker\\s+compose|docker-compose)\\s+build\\b"
+    ],
+    "patterns": [
+      "Successfully built \\w+",
+      "Successfully tagged \\S+",
+      "writing image sha256:",
+      "ERROR \\[",
+      "exit code: \\d+"
+    ]
+  },
+  "rules": {
+    "stripAnsi": true,
+    "includePatterns": [
+      "ERROR",
+      "ERR!",
+      "exit code: \\d+",
+      "failed to solve",
+      "failed to compute cache key",
+      "Cannot connect to the Docker daemon",
+      "no such file or directory",
+      "Successfully built \\w+",
+      "Successfully tagged \\S+",
+      "writing image sha256:",
+      "naming to docker\\.io/\\S+",
+      "DONE",
+      "^Step \\d+/\\d+ :",
+      "Sending build context",
+      "WARN\\s*\\["
+    ],
+    "dropPatterns": [
+      "^#\\d+\\s+sha256:",
+      "^\\s*$",
+      "^\\s+\\d+\\.\\d+s$",
+      "^\\s*-+>\\s*Running in",
+      "^\\s*Removing intermediate container",
+      "^\\s*-+>\\s*[a-f0-9]{12}$"
+    ],
+    "collapsePatterns": ["^#\\d+\\s+CACHED", "^\\s*Pulling fs layer"],
+    "deduplicate": false,
+    "maxLines": 100,
+    "headLines": 15,
+    "tailLines": 50
+  },
+  "preserve": {
+    "errorPatterns": ["ERROR", "exit code: \\d+", "failed to solve", "Cannot connect"],
+    "summaryPatterns": ["Successfully built", "Successfully tagged", "writing image", "DONE"]
+  },
+  "tests": [
+    {
+      "name": "successful build",
+      "command": "docker build",
+      "input": "Step 1/3 : FROM node:20\nStep 2/3 : COPY . /app\nStep 3/3 : RUN npm install\n ---> Running in abc123\n ---> def456\nRemoving intermediate container abc123\nSuccessfully built def456\nSuccessfully tagged myapp:latest\n",
+      "expected": "Step 1/3 : FROM node:20\nStep 2/3 : COPY . /app\nStep 3/3 : RUN npm install\nSuccessfully built def456\nSuccessfully tagged myapp:latest"
+    },
+    {
+      "name": "build failure",
+      "command": "docker build",
+      "input": "Step 1/2 : FROM node:20\nStep 2/2 : RUN npm install\nERROR: failed to solve: process \"/bin/sh -c npm install\" did not complete successfully: exit code: 1\n",
+      "expected": "Step 1/2 : FROM node:20\nStep 2/2 : RUN npm install\nERROR: failed to solve: process \"/bin/sh -c npm install\" did not complete successfully: exit code: 1"
+    },
+    {
+      "name": "preserves buildkit-prefixed RUN step errors",
+      "command": "docker build",
+      "input": "#8 [build 3/4] RUN npm run build\n#8 0.456 src/a.ts:1:1 - ERROR TS2322: Type 'string' is not assignable\n#8 0.789 npm ERR! exit code 1\n#8 ERROR: process \"/bin/sh -c npm run build\" did not complete successfully: exit code: 1\n",
+      "expected": "#8 0.456 src/a.ts:1:1 - ERROR TS2322: Type 'string' is not assignable\n#8 0.789 npm ERR! exit code 1\n#8 ERROR: process \"/bin/sh -c npm run build\" did not complete successfully: exit code: 1"
+    }
+  ]
+}
diff --git a/open-sse/services/compression/engines/rtk/filters/gh.json b/open-sse/services/compression/engines/rtk/filters/gh.json
new file mode 100644
index 0000000000..42fe6e9865
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/filters/gh.json
@@ -0,0 +1,98 @@
+{
+  "id": "gh",
+  "label": "GitHub CLI",
+  "description": "Keep GitHub CLI command results, errors, and PR/issue summaries while stripping pagination noise. Skips `gh api` and `--json` invocations (structured output that would be corrupted by line filtering).",
+  "category": "cloud",
+  "priority": 70,
+  "match": {
+    "outputTypes": ["gh"],
+    "commands": [
+      "^gh\\s+(?:pr|issue|repo|run|workflow|release|auth|browse|gist|secret|label|search|status)(?!.*--json)\\b"
+    ],
+    "patterns": [
+      "^https?://github\\.com/",
+      "Created pull request",
+      "Created issue",
+      "✓\\s+Logged in",
+      "X\\s+\\S+",
+      "GraphQL error",
+      "HTTP \\d{3}:"
+    ]
+  },
+  "rules": {
+    "stripAnsi": true,
+    "includePatterns": [
+      "^https?://github\\.com/",
+      "Creat(?:ed|ing) pull request",
+      "Creat(?:ed|ing) issue",
+      "Merged pull request",
+      "Closed (?:pull request|issue)",
+      "Reopened",
+      "✓\\s+",
+      "X\\s+\\S+",
+      "FAIL",
+      "GraphQL error",
+      "HTTP \\d{3}:",
+      "error:",
+      "not found",
+      "must be authenticated",
+      "rate limit",
+      "completed\\s+\\w+",
+      "queued\\s+\\w+",
+      "in_progress\\s+\\w+",
+      "#\\d+\\s+\\S"
+    ],
+    "dropPatterns": [
+      "^\\s*$",
+      "^Showing \\d+ of \\d+",
+      "^For more information on output formatting"
+    ],
+    "collapsePatterns": [],
+    "deduplicate": false,
+    "maxLines": 80,
+    "headLines": 20,
+    "tailLines": 40
+  },
+  "preserve": {
+    "errorPatterns": [
+      "GraphQL error",
+      "HTTP \\d{3}:",
+      "error:",
+      "not found",
+      "must be authenticated",
+      "rate limit"
+    ],
+    "summaryPatterns": [
+      "Creat(?:ed|ing) pull request",
+      "Creat(?:ed|ing) issue",
+      "Merged pull request",
+      "^https?://github\\.com/"
+    ]
+  },
+  "tests": [
+    {
+      "name": "pr create",
+      "command": "gh pr create",
+      "input": "\nCreating pull request for feat/foo into main in owner/repo\n\nhttps://github.com/owner/repo/pull/123\n",
+      "expected": "Creating pull request for feat/foo into main in owner/repo\nhttps://github.com/owner/repo/pull/123"
+    },
+    {
+      "name": "auth error",
+      "command": "gh pr list",
+      "input": "error: must be authenticated to use this command\n",
+      "expected": "error: must be authenticated to use this command"
+    },
+    {
+      "name": "skips gh api (structured JSON output)",
+      "command": "gh api repos/owner/repo/pulls/1",
+      "input": "{\n  \"number\": 1,\n  \"title\": \"feat: x\",\n  \"user\": { \"login\": \"alice\" }\n}\n",
+      "expected": "{\n  \"number\": 1,\n  \"title\": \"feat: x\",\n  \"user\": { \"login\": \"alice\" }\n}"
+    },
+    {
+      "name": "skips --json output (would corrupt structured data)",
+      "command": "gh pr list --json number,title",
+      "input": "[\n  { \"number\": 1, \"title\": \"feat: x\" },\n  { \"number\": 2, \"title\": \"fix: y\" }\n]\n",
+      "expected": "[\n  { \"number\": 1, \"title\": \"feat: x\" },\n  { \"number\": 2, \"title\": \"fix: y\" }\n]"
+    }
+  ]
+}
diff --git a/open-sse/services/compression/engines/rtk/filters/kubectl.json b/open-sse/services/compression/engines/rtk/filters/kubectl.json
new file mode 100644
index 0000000000..eeb9c5bea4
--- /dev/null
+++ b/open-sse/services/compression/engines/rtk/filters/kubectl.json
@@ -0,0 +1,99 @@
+{
+  "id": "kubectl",
+  "label": "kubectl",
+  "description": "Keep kubectl status, rollout and error output. Skips logs/exec/top (arbitrary content) and structured -o json/yaml output.",
+  "category": "cloud",
+  "priority": 78,
+  "match": {
+    "outputTypes": ["kubectl"],
+    "commands": [
+      "^kubectl\\s+(?:get|describe|apply|delete|rollout|events?)(?!.*(?:-o|--output)(?:\\s+|=)(?:json|yaml|go-template|jsonpath|template|name))\\b"
+    ],
+    "patterns": [
+      "NAME\\s+READY\\s+STATUS",
+      "NAME\\s+TYPE\\s+CLUSTER-IP",
+      "CrashLoopBackOff",
+      "ImagePullBackOff",
+      "ErrImagePull",
+      "FailedScheduling",
+      "OOMKilled",
+      "Error from server"
+    ]
+  },
+  "rules": {
+    "stripAnsi": true,
+    "includePatterns": [
+      "Error from server",
+      "CrashLoopBackOff",
+      "ImagePullBackOff",
+      "ErrImagePull",
+      "FailedScheduling",
+      "OOMKilled",
+      "Evicted",
+      "ContainerCannotRun",
+      "BackOff",
+      "Unhealthy",
+      "Killing",
+      "Restarting",
+      "NAME\\s+READY\\s+STATUS",
+      "NAME\\s+TYPE\\s+CLUSTER-IP",
+      "Warning\\s+",
+      "deployment\\.apps/\\S+\\s+(?:created|configured|unchanged)",
+      "service/\\S+\\s+(?:created|configured)",
+      "pod/\\S+\\s+(?:created|deleted)",
+      "rollout (?:status|history)",
+      "successfully rolled out"
+    ],
+    "dropPatterns": [
+      "^\\s*$",
+      "^\\s*creationTimestamp:",
+      "^\\s*resourceVersion:",
+      "^\\s*uid:",
+      "^\\s*managedFields:",
+      "^\\s*selfLink:",
+      "^\\s*generation:"
+    ],
+    "collapsePatterns": ["Normal\\s+", "^\\s*-\\s+lastTransitionTime:"],
+    "deduplicate": true,
+    "maxLines": 120,
+    "headLines": 20,
+    "tailLines": 60
+  },
+  "preserve": {
+    "errorPatterns": [
+      "Error from server",
+      "CrashLoopBackOff",
+      "ImagePullBackOff",
+      "OOMKilled",
+      "FailedScheduling",
+      "Evicted"
+    ],
+    "summaryPatterns": ["successfully rolled out", "deployment\\.apps/\\S+\\s+\\w+"]
+  },
+  "tests": [
+    {
+      "name": "pod listing with failure",
+      "command": "kubectl get",
+      "input": "NAME       READY   STATUS             RESTARTS   AGE\napi-7d8    1/1     Running            0          2h\nweb-2c4    0/1     CrashLoopBackOff   5          12m\ndb-9f1     1/1     Running            0          2h\n",
+      "expected": "NAME       READY   STATUS             RESTARTS   AGE\nweb-2c4    0/1     CrashLoopBackOff   5          12m"
+    },
+    {
+      "name": "rollout success",
+      "command": "kubectl rollout status",
+      "input": "Waiting for deployment \"api\" rollout to finish: 0 of 3 updated replicas are available...\nWaiting for deployment \"api\" rollout to finish: 1 of 3 updated replicas are available...\ndeployment \"api\" successfully rolled out\n",
+      "expected": "deployment \"api\" successfully rolled out"
+    },
+    {
+      "name": "skips kubectl logs (arbitrary application output)",
+      "command": "kubectl logs api-pod",
+      "input": "2026-05-28T10:00:00 INFO request handled\n2026-05-28T10:00:01 INFO request handled\n",
+      "expected": "2026-05-28T10:00:00 INFO request handled\n2026-05-28T10:00:01 INFO request handled"
+    },
+    {
+      "name": "skips json output (would corrupt structured data)",
+      "command": "kubectl get pods -o json",
+      "input": "{\n  \"apiVersion\": \"v1\",\n  \"items\": [\n    { \"metadata\": { \"name\": \"api\" } }\n  ]\n}\n",
+      "expected": "{\n  \"apiVersion\": \"v1\",\n  \"items\": [\n    { \"metadata\": { \"name\": \"api\" } }\n  ]\n}"
+    }
+  ]
+}
diff --git a/tests/unit/rtk-new-filters.test.ts b/tests/unit/rtk-new-filters.test.ts
new file mode 100644
index 0000000000..e3aa4e4471
--- /dev/null
+++ b/tests/unit/rtk-new-filters.test.ts
@@ -0,0 +1,119 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+
+import {
+  loadRtkFilters,
+  matchRtkFilter,
+  runRtkFilterTests,
+} from "../../open-sse/services/compression/index.ts";
+
+const NEW_FILTERS = ["kubectl", "docker-build", "composer", "gh"] as const;
+
+const MATCH_CASES: Array<[string, string, string]> = [
+  [
+    "kubectl",
+    "NAME       READY   STATUS             RESTARTS   AGE\nweb-2c4    0/1     CrashLoopBackOff   5          12m",
+    "kubectl get pods",
+  ],
+  [
+    "docker-build",
+    "Step 1/2 : FROM node:20\nSuccessfully built abc123",
+    "docker build -t myapp .",
+  ],
+  [
+    "composer",
+    "Package operations: 5 installs, 0 updates, 0 removals\nGenerating optimized autoload files",
+    "composer install",
+  ],
+  [
+    "gh",
+    "Creating pull request for feat/foo into main in owner/repo\nhttps://github.com/owner/repo/pull/123",
+    "gh pr create",
+  ],
+];
+
+describe("RTK new-filter catalog (kubectl, docker-build, composer, gh)", () => {
+  it("loads all 4 new filters from disk", () => {
+    const filters = loadRtkFilters({ refresh: true, customFiltersEnabled: false });
+    const ids = new Set(filters.map((f) => f.id));
+    for (const id of NEW_FILTERS) {
+      assert.ok(ids.has(id), `expected filter "${id}" to be loaded`);
+    }
+  });
+
+  it("matches each new filter from realistic command output", () => {
+    for (const [expectedId, output, command] of MATCH_CASES) {
+      const filter = matchRtkFilter(output, command, { customFiltersEnabled: false });
+      assert.equal(filter?.id, expectedId, `wrong filter matched for "${command}"`);
+    }
+  });
+
+  it("kubectl skips arbitrary-content commands (logs, exec, top)", () => {
+    const logOutput =
+      "2026-05-28T10:00:00 INFO request handled\n2026-05-28T10:00:01 INFO request handled";
+    for (const cmd of ["kubectl logs api-pod", "kubectl exec api-pod -- npm test", "kubectl top nodes"]) {
+      const filter = matchRtkFilter(logOutput, cmd, { customFiltersEnabled: false });
+      assert.notEqual(
+        filter?.id,
+        "kubectl",
+        `kubectl filter must not claim "${cmd}" (arbitrary content)`
+      );
+    }
+  });
+
+  it("kubectl skips structured -o json/yaml output to avoid corrupting it", () => {
+    const jsonOutput = '{\n  "apiVersion": "v1",\n  "items": []\n}';
+    for (const cmd of [
+      "kubectl get pods -o json",
+      "kubectl get pods -o yaml",
+      "kubectl get pods --output=json",
+      "kubectl get svc -o jsonpath='{.items[*].metadata.name}'",
+    ]) {
+      const filter = matchRtkFilter(jsonOutput, cmd, { customFiltersEnabled: false });
+      assert.notEqual(
+        filter?.id,
+        "kubectl",
+        `kubectl filter must not claim structured output: "${cmd}"`
+      );
+    }
+  });
+
+  it("gh skips `gh api` and --json invocations (structured output)", () => {
+    const jsonOutput = '{\n  "number": 1,\n  "title": "feat: x"\n}';
+    for (const cmd of [
+      "gh api repos/owner/repo/pulls/1",
+      "gh api graphql -f query=...",
+      "gh pr list --json number,title",
+      "gh issue list --json number,title,author",
+    ]) {
+      const filter = matchRtkFilter(jsonOutput, cmd, { customFiltersEnabled: false });
+      assert.notEqual(
+        filter?.id,
+        "gh",
+        `gh filter must not claim structured output: "${cmd}"`
+      );
+    }
+  });
+
+  it("docker-build matches both v2 (docker compose) and legacy (docker-compose) build", () => {
+    const output = "Step 1/2 : FROM node:20\nSuccessfully built abc123";
+    for (const cmd of ["docker build .", "docker compose build", "docker-compose build", "docker buildx build ."]) {
+      const filter = matchRtkFilter(output, cmd, { customFiltersEnabled: false });
+      assert.equal(filter?.id, "docker-build", `expected docker-build to match "${cmd}"`);
+    }
+  });
+
+  it("inline tests for new filters all pass", () => {
+    const result = runRtkFilterTests({ requireAll: false, customFiltersEnabled: false });
+    const newFilterOutcomes = result.outcomes.filter((o) =>
+      NEW_FILTERS.includes(o.filterId as (typeof NEW_FILTERS)[number])
+    );
+    assert.ok(newFilterOutcomes.length > 0, "expected inline tests from new filters to run");
+    const failed = newFilterOutcomes.filter((o) => !o.passed);
+    assert.deepEqual(
+      failed,
+      [],
+      `inline tests failed: ${failed.map((f) => `${f.filterId}/${f.testName}`).join(", ")}`
+    );
+  });
+});