diff --git a/.oxlintrc.json b/.oxlintrc.json
index 6a86d7b0d..a7710f1e6 100644
--- a/.oxlintrc.json
+++ b/.oxlintrc.json
@@ -16,7 +16,15 @@
     "packages/codemod-cli3to4/tests/**"
   ],
   "rules": {
-    "no-unused-vars": "off",
+    "no-unused-vars": [
+      "error",
+      {
+        "argsIgnorePattern": "^_",
+        "varsIgnorePattern": "^_",
+        "caughtErrors": "none",
+        "ignoreRestSiblings": true
+      }
+    ],
     "typescript/return-await": ["error", "always"],
     "typescript/no-floating-promises": [
       "error",
diff --git a/packages/cli/script/generate-skill.ts b/packages/cli/script/generate-skill.ts
index 4db8890bd..7a289e992 100644
--- a/packages/cli/script/generate-skill.ts
+++ b/packages/cli/script/generate-skill.ts
@@ -21,7 +21,7 @@
  *   docs/public/.well-known/skills/index.json
  */
 
-import { existsSync, mkdirSync, rmSync } from "node:fs";
+import { mkdirSync, rmSync } from "node:fs";
 import { access, readFile, writeFile } from "node:fs/promises";
 import { routes } from "../src/app.js";
 import {
diff --git a/packages/cli/src/commands/agent-conversation/view.ts b/packages/cli/src/commands/agent-conversation/view.ts
index 02efad033..4c5af2fb7 100644
--- a/packages/cli/src/commands/agent-conversation/view.ts
+++ b/packages/cli/src/commands/agent-conversation/view.ts
@@ -11,7 +11,6 @@ import { ORG_TARGET } from "../../lib/completion-target.js";
 import {
   buildTranscriptResult,
   formatTranscriptResult,
-  type TranscriptResult,
 } from "../../lib/formatters/conversation.js";
 import { CommandOutput } from "../../lib/formatters/output.js";
 import { ValidationError } from "../../lib/errors.js";
diff --git a/packages/cli/src/commands/auth/switch.ts b/packages/cli/src/commands/auth/switch.ts
index bc469843c..bbb6ae668 100644
--- a/packages/cli/src/commands/auth/switch.ts
+++ b/packages/cli/src/commands/auth/switch.ts
@@ -30,10 +30,7 @@ import {
   setActiveAccount,
 } from "../../lib/db/auth.js";
 import { AuthError, ResolutionError } from "../../lib/errors.js";
-import {
-  type AccountSwitchResult,
-  formatAccountSwitch,
-} from "../../lib/formatters/accounts.js";
+import { formatAccountSwitch } from "../../lib/formatters/accounts.js";
 import { CommandOutput } from "../../lib/formatters/output.js";
 import { parseLoginUrl } from "./login.js";
 
diff --git a/packages/cli/src/commands/dashboard/create.ts b/packages/cli/src/commands/dashboard/create.ts
index 718e513e0..4c279da65 100644
--- a/packages/cli/src/commands/dashboard/create.ts
+++ b/packages/cli/src/commands/dashboard/create.ts
@@ -31,7 +31,6 @@ import { applySentryUrlContext } from "../../lib/sentry-url-parser.js";
 import { buildDashboardUrl } from "../../lib/sentry-web-urls.js";
 import { setOrgProjectContext } from "../../lib/telemetry.js";
 import { DashboardCreateOutputSchema } from "../../generated/output-schemas/dashboard.js";
-import type { DashboardCreateOutput } from "../../output-schemas/dashboard.js";
 import { withDashboardErrors } from "./resolve.js";
 
 type CreateFlags = {
@@ -39,8 +38,6 @@ type CreateFlags = {
   readonly fields?: string[];
 };
 
-type CreateResult = DashboardCreateOutput;
-
 /** `dashboard create`'s positionals, parsed: the title and the target. */
 type CreateInput = {
   readonly title: string;
diff --git a/packages/cli/src/commands/dashboard/widget/delete.ts b/packages/cli/src/commands/dashboard/widget/delete.ts
index d748a8594..957041670 100644
--- a/packages/cli/src/commands/dashboard/widget/delete.ts
+++ b/packages/cli/src/commands/dashboard/widget/delete.ts
@@ -19,10 +19,7 @@ import { formatWidgetDeleted } from "../../../lib/formatters/human.js";
 import { CommandOutput } from "../../../lib/formatters/output.js";
 import { buildDeleteCommand } from "../../../lib/mutate-command.js";
 import { buildDashboardUrl } from "../../../lib/sentry-web-urls.js";
-import {
-  type DashboardWidgetDeleteOutput,
-  prepareDashboardForUpdate,
-} from "../../../types/dashboard.js";
+import { prepareDashboardForUpdate } from "../../../types/dashboard.js";
 import { type DashboardArguments, dashboardArguments } from "../arguments.js";
 import { withDashboardErrors, resolveWidgetIndex } from "../resolve.js";
 import { DashboardWidgetDeleteOutputSchema } from "../../../generated/output-schemas/dashboard.js";
diff --git a/packages/cli/src/commands/replay/download.ts b/packages/cli/src/commands/replay/download.ts
index afb5223b0..38be82d27 100644
--- a/packages/cli/src/commands/replay/download.ts
+++ b/packages/cli/src/commands/replay/download.ts
@@ -17,10 +17,7 @@ import { buildCommand } from "../../lib/command.js";
 import { parseFilePath } from "../../lib/completion-target.js";
 import { ApiError, ResolutionError } from "../../lib/errors.js";
 import { CommandOutput } from "../../lib/formatters/output.js";
-import {
-  formatReplayDownloadResult,
-  type ReplayDownloadData,
-} from "../../lib/formatters/replay.js";
+import { formatReplayDownloadResult } from "../../lib/formatters/replay.js";
 import {
   applyFreshFlag,
   FRESH_ALIASES,
diff --git a/packages/cli/src/lib/api/conversations.ts b/packages/cli/src/lib/api/conversations.ts
index cf338228d..a33c10975 100644
--- a/packages/cli/src/lib/api/conversations.ts
+++ b/packages/cli/src/lib/api/conversations.ts
@@ -31,7 +31,6 @@ import { resolveOrgRegion } from "../region.js";
 import { getSdkClientConfig } from "../sentry-sdk-client.js";
 
 import {
-  API_MAX_PER_PAGE,
   getOrgSdkConfig,
   MAX_PAGINATION_PAGES,
   type PaginatedResponse,
diff --git a/packages/cli/src/lib/api/issues.ts b/packages/cli/src/lib/api/issues.ts
index a3db4a90d..af4a4ea73 100644
--- a/packages/cli/src/lib/api/issues.ts
+++ b/packages/cli/src/lib/api/issues.ts
@@ -31,7 +31,6 @@ import { applyCustomHeaders } from "../custom-headers.js";
 import { ApiError, ValidationError } from "../errors.js";
 
 import {
-  API_MAX_PER_PAGE,
   getOrgSdkConfig,
   ORG_FANOUT_CONCURRENCY,
   type PaginatedResponse,
diff --git a/packages/cli/src/lib/api/traces.ts b/packages/cli/src/lib/api/traces.ts
index 8d653dd48..607d6564b 100644
--- a/packages/cli/src/lib/api/traces.ts
+++ b/packages/cli/src/lib/api/traces.ts
@@ -39,7 +39,6 @@ import { getSdkClientConfig } from "../sentry-sdk-client.js";
 import { isAllDigits } from "../utils.js";
 
 import {
-  API_MAX_PER_PAGE,
   apiRequestToRegion,
   getOrgSdkConfig,
   type PaginatedResponse,
diff --git a/packages/cli/src/lib/formatters/log.ts b/packages/cli/src/lib/formatters/log.ts
index f44435a27..a41a1abf0 100644
--- a/packages/cli/src/lib/formatters/log.ts
+++ b/packages/cli/src/lib/formatters/log.ts
@@ -7,7 +7,6 @@
 import { tableCell, text } from "@sentry/toolkit-core/markdown";
 import type {
   DetailedSentryLog,
-  SentryLog,
   TraceItemAttribute,
 } from "../../types/index.js";
 import { stringifyUnknown } from "../errors.js";
diff --git a/packages/cli/src/lib/formatters/table.ts b/packages/cli/src/lib/formatters/table.ts
index 50a795c6c..b38a82562 100644
--- a/packages/cli/src/lib/formatters/table.ts
+++ b/packages/cli/src/lib/formatters/table.ts
@@ -9,7 +9,6 @@
  * treats them as zero-width for column sizing.
  */
 
-import { tableCell } from "@sentry/toolkit-core/markdown";
 import type { Writer } from "../../types/index.js";
 import {
   isPlainOutput,
diff --git a/packages/cli/src/types/replay.ts b/packages/cli/src/types/replay.ts
index 234ea63da..d1ac68652 100644
--- a/packages/cli/src/types/replay.ts
+++ b/packages/cli/src/types/replay.ts
@@ -9,7 +9,6 @@ import {
   nullable,
   nullish,
   number,
-  object,
   optional,
   pipe,
   record,
diff --git a/packages/cli/src/types/sentry.ts b/packages/cli/src/types/sentry.ts
index 6c6497a9f..697675a46 100644
--- a/packages/cli/src/types/sentry.ts
+++ b/packages/cli/src/types/sentry.ts
@@ -55,7 +55,6 @@ import {
   number,
   object,
   optional,
-  partial,
   pipe,
   record,
   string,
diff --git a/packages/cli/test/lib/sentry-urls.property.test.ts b/packages/cli/test/lib/sentry-urls.property.test.ts
index 65b2bd6e2..32408e6dc 100644
--- a/packages/cli/test/lib/sentry-urls.property.test.ts
+++ b/packages/cli/test/lib/sentry-urls.property.test.ts
@@ -81,9 +81,6 @@ const traceIdArb = stringMatching(/^[a-f0-9]{32}$/);
 /** Valid dashboard IDs (numeric strings) */
 const dashboardIdArb = stringMatching(/^[1-9][0-9]{0,8}$/);
 
-/** Valid project IDs (numeric strings, same shape as other Sentry IDs) */
-const projectIdArb = stringMatching(/^[1-9][0-9]{0,8}$/);
-
 /** Common Sentry regions */
 const sentryRegionArb = constantFrom("us", "de", "eu", "staging");
 
diff --git a/packages/cli/test/script/zod-v3-stub-plugin.test.ts b/packages/cli/test/script/zod-v3-stub-plugin.test.ts
index 68b6f568b..bbe0fd633 100644
--- a/packages/cli/test/script/zod-v3-stub-plugin.test.ts
+++ b/packages/cli/test/script/zod-v3-stub-plugin.test.ts
@@ -6,7 +6,7 @@
  * Zod 3 module reaches the output.
  */
 
-import { mkdtempSync, realpathSync, rmSync, writeFileSync } from "node:fs";
+import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
 import { createRequire } from "node:module";
 import { tmpdir } from "node:os";
 import { dirname, join } from "node:path";
diff --git a/packages/logger/bench/run.mjs b/packages/logger/bench/run.mjs
index a6fd98add..8d8543099 100644
--- a/packages/logger/bench/run.mjs
+++ b/packages/logger/bench/run.mjs
@@ -52,9 +52,9 @@ async function setUp(name) {
     logfmtReporter,
     sentryReporter,
   } = await import(ENTRY);
-  let sink;
-  const stream = { write: (chunk) => (sink = chunk) };
-  const send = (message, attributes) => (sink = attributes ?? message);
+  let _sink;
+  const stream = { write: (chunk) => (_sink = chunk) };
+  const send = (message, attributes) => (_sink = attributes ?? message);
   const sentryLogger = {
     trace: send,
     debug: send,
@@ -72,15 +72,15 @@ async function setUp(name) {
 
   switch (name) {
     case "noop": {
-      const noop = (...args) => (sink = args);
+      const noop = (...args) => (_sink = args);
       return () => noop("Logged in as %s", "jane");
     }
     case "debug": {
-      const log = logger({ log: (record) => (sink = record) });
+      const log = logger({ log: (record) => (_sink = record) });
       return () => log.debug("Logged in as %s", "jane");
     }
     case "noopReporter": {
-      const log = logger({ log: (record) => (sink = record) });
+      const log = logger({ log: (record) => (_sink = record) });
       return () => log.info("Logged in as %s", "jane");
     }
     case "formatWrite":
diff --git a/packages/mcp-cloudflare/src/client/components/chat/chat-message.tsx b/packages/mcp-cloudflare/src/client/components/chat/chat-message.tsx
index e7429d89c..20e9b30d2 100644
--- a/packages/mcp-cloudflare/src/client/components/chat/chat-message.tsx
+++ b/packages/mcp-cloudflare/src/client/components/chat/chat-message.tsx
@@ -15,7 +15,6 @@ import type {
 const TextPart = memo(function TextPart({
   text,
   role,
-  messageId,
   isStreaming,
   messageData,
   onSlashCommand,
diff --git a/packages/mcp-cloudflare/src/client/components/chat/tool-invocation.tsx b/packages/mcp-cloudflare/src/client/components/chat/tool-invocation.tsx
index 3235d94a2..44e94048f 100644
--- a/packages/mcp-cloudflare/src/client/components/chat/tool-invocation.tsx
+++ b/packages/mcp-cloudflare/src/client/components/chat/tool-invocation.tsx
@@ -12,11 +12,7 @@ function getTokenCount(content: ToolMessage[]): number {
   }, 0);
 }
 
-export function ToolInvocation({
-  tool,
-  messageId,
-  index,
-}: ToolInvocationProps) {
+export function ToolInvocation({ tool }: ToolInvocationProps) {
   const [isExpanded, setIsExpanded] = useState(false);
 
   return (
diff --git a/packages/mcp-cloudflare/src/client/components/fragments/remote-setup.tsx b/packages/mcp-cloudflare/src/client/components/fragments/remote-setup.tsx
index b6855c624..9a306b541 100644
--- a/packages/mcp-cloudflare/src/client/components/fragments/remote-setup.tsx
+++ b/packages/mcp-cloudflare/src/client/components/fragments/remote-setup.tsx
@@ -13,10 +13,7 @@ import { VSCodeInstructions } from "./instructions/vscode";
 import { WarpInstructions } from "./instructions/warp";
 import { ZedInstructions } from "./instructions/zed";
 
-const mcpServerName = import.meta.env.DEV ? "sentry-dev" : "sentry";
-
 export default function RemoteSetup() {
-  const endpoint = new URL("/mcp", window.location.href).href;
   return (
     <>
       <Prose className="mb-6">
diff --git a/packages/mcp-cloudflare/src/client/components/fragments/stdio-setup.tsx b/packages/mcp-cloudflare/src/client/components/fragments/stdio-setup.tsx
index 00f36eb77..6d495df8a 100644
--- a/packages/mcp-cloudflare/src/client/components/fragments/stdio-setup.tsx
+++ b/packages/mcp-cloudflare/src/client/components/fragments/stdio-setup.tsx
@@ -5,7 +5,6 @@ import CodeSnippet from "../ui/code-snippet";
 import { Prose } from "../ui/prose";
 import InstallTabs, { Tab } from "./install-tabs";
 
-const mcpServerName = import.meta.env.DEV ? "sentry-dev" : "sentry";
 const orderedSkills = [...skillDefinitions]
   .filter((skill) => !skill.deprecated)
   .sort((a, b) => a.order - b.order);
diff --git a/packages/mcp-cloudflare/src/server/lib/approval-dialog.ts b/packages/mcp-cloudflare/src/server/lib/approval-dialog.ts
index a90dacb14..350f2268a 100644
--- a/packages/mcp-cloudflare/src/server/lib/approval-dialog.ts
+++ b/packages/mcp-cloudflare/src/server/lib/approval-dialog.ts
@@ -454,15 +454,8 @@ export async function renderApprovalDialog(
   request: Request,
   options: ApprovalDialogOptions,
 ): Promise<Response> {
-  const {
-    client,
-    server,
-    scope,
-    redirectUri,
-    state,
-    cookieSecret,
-    defaultSkills,
-  } = options;
+  const { client, scope, redirectUri, state, cookieSecret, defaultSkills } =
+    options;
   const defaultSkillIds =
     defaultSkills === undefined
       ? new Set(APPROVABLE_SKILLS.map((skill) => skill.id))
diff --git a/packages/mcp-cloudflare/src/server/lib/constraint-utils.test.ts b/packages/mcp-cloudflare/src/server/lib/constraint-utils.test.ts
index d482ae405..b19fd9532 100644
--- a/packages/mcp-cloudflare/src/server/lib/constraint-utils.test.ts
+++ b/packages/mcp-cloudflare/src/server/lib/constraint-utils.test.ts
@@ -98,7 +98,7 @@ describe("verifyConstraintsAccess", () => {
       { accessToken: undefined, label: "undefined" },
     ];
 
-    for (const { accessToken, label } of testCases) {
+    for (const { accessToken } of testCases) {
       const result = await verifyConstraintsAccess(
         { organizationSlug: "org", projectSlug: null },
         { accessToken, sentryHost: host },
diff --git a/packages/mcp-cloudflare/src/server/oauth/authorize.test.ts b/packages/mcp-cloudflare/src/server/oauth/authorize.test.ts
index ee3df540e..925c69dbe 100644
--- a/packages/mcp-cloudflare/src/server/oauth/authorize.test.ts
+++ b/packages/mcp-cloudflare/src/server/oauth/authorize.test.ts
@@ -14,7 +14,7 @@ const mockOAuthProvider = {
 };
 
 // Create test app with mocked environment
-function createTestApp(env: Partial<Env> = {}) {
+function createTestApp() {
   const app = new Hono<{ Bindings: Env }>();
   app.route("/oauth", oauthRoute);
   return app;
@@ -100,7 +100,7 @@ describe("oauth authorize routes", () => {
       SENTRY_CLIENT_SECRET: "test-client-secret",
       SENTRY_HOST: "sentry.io",
     };
-    app = createTestApp(testEnv);
+    app = createTestApp();
   });
 
   describe("GET /oauth/authorize", () => {
diff --git a/packages/mcp-cloudflare/src/server/oauth/helpers.test.ts b/packages/mcp-cloudflare/src/server/oauth/helpers.test.ts
index ee30d6872..66827d06e 100644
--- a/packages/mcp-cloudflare/src/server/oauth/helpers.test.ts
+++ b/packages/mcp-cloudflare/src/server/oauth/helpers.test.ts
@@ -24,7 +24,6 @@ vi.mock("@sentry/cloudflare", () => ({
 
 import {
   OAUTH_GRANT_AGE_BUCKET_ATTRIBUTE,
-  OAUTH_GRANT_SHAPE_ATTRIBUTE,
   OAUTH_REFRESH_OUTCOME_ATTRIBUTE,
   OAUTH_UPSTREAM_EXPIRES_IN_BUCKET_ATTRIBUTE,
 } from "./telemetry";
diff --git a/packages/mcp-cloudflare/src/server/routes/chat-oauth.ts b/packages/mcp-cloudflare/src/server/routes/chat-oauth.ts
index 75eaa96c5..82ec628d4 100644
--- a/packages/mcp-cloudflare/src/server/routes/chat-oauth.ts
+++ b/packages/mcp-cloudflare/src/server/routes/chat-oauth.ts
@@ -99,10 +99,6 @@ const ClientRegistrationResponseSchema = z.object({
   client_id_issued_at: z.number().optional(),
 });
 
-type ClientRegistrationResponse = z.infer<
-  typeof ClientRegistrationResponseSchema
->;
-
 // Get or register OAuth client with the MCP server
 export async function getOrRegisterChatClient(
   env: Env,
diff --git a/packages/mcp-cloudflare/src/server/routes/chat.ts b/packages/mcp-cloudflare/src/server/routes/chat.ts
index 8e256ffbb..62bb7e651 100644
--- a/packages/mcp-cloudflare/src/server/routes/chat.ts
+++ b/packages/mcp-cloudflare/src/server/routes/chat.ts
@@ -61,7 +61,7 @@ export function syncOpenRouterEnvFromBindings(
 async function refreshTokenIfNeeded(
   c: Context<{ Bindings: Env }>,
 ): Promise<{ token: string; authData: AuthData } | null> {
-  const { getCookie, setCookie, deleteCookie } = await import("hono/cookie");
+  const { getCookie, deleteCookie } = await import("hono/cookie");
 
   const authDataCookie = getCookie(c, "sentry_auth_data");
   if (!authDataCookie) {
diff --git a/packages/mcp-cloudflare/src/server/routes/mcp.ts b/packages/mcp-cloudflare/src/server/routes/mcp.ts
index 359361198..3124d383b 100644
--- a/packages/mcp-cloudflare/src/server/routes/mcp.ts
+++ b/packages/mcp-cloudflare/src/server/routes/mcp.ts
@@ -21,10 +21,10 @@ function jsonResponse(json: unknown, status = 200) {
 
 export default new Hono()
   // Index: advertise available endpoints
-  .get("/", (c) =>
+  .get("/", () =>
     jsonResponse({
       endpoints: ["/.mcp/tools.json"],
     }),
   )
   // Tools
-  .get("/tools.json", (c) => jsonResponse(TOOL_DEFINITIONS));
+  .get("/tools.json", () => jsonResponse(TOOL_DEFINITIONS));
diff --git a/packages/mcp-core/scripts/generate-otel-namespaces.ts b/packages/mcp-core/scripts/generate-otel-namespaces.ts
index 4066240c1..98fdb990d 100644
--- a/packages/mcp-core/scripts/generate-otel-namespaces.ts
+++ b/packages/mcp-core/scripts/generate-otel-namespaces.ts
@@ -65,11 +65,6 @@ const OtelYamlFileSchema = z.object({
   groups: z.array(OtelGroupSchema),
 });
 
-// TypeScript types inferred from Zod schemas
-type OtelAttribute = z.infer<typeof OtelAttributeSchema>;
-type OtelGroup = z.infer<typeof OtelGroupSchema>;
-type OtelYamlFile = z.infer<typeof OtelYamlFileSchema>;
-
 interface JsonAttribute {
   description: string;
   type: string;
diff --git a/packages/mcp-core/src/api-client/client.ts b/packages/mcp-core/src/api-client/client.ts
index acc0d2629..1811e15b0 100644
--- a/packages/mcp-core/src/api-client/client.ts
+++ b/packages/mcp-core/src/api-client/client.ts
@@ -17,19 +17,15 @@ import {
 } from "@sentry/api";
 import { operations } from "@sentry/api/operations";
 import {
-  ApiError,
   ApiNotFoundError,
   apiPath,
-  ApiRateLimitError,
   type ApiTarget,
   ApiValidationError,
-  applyStatsMixinTimeParams,
   applyTimeParams,
   createApiClientCore,
   createApiError,
   createApiTransport,
   createIdempotentOperationMatcher,
-  parseStatsPeriod,
   readJsonResponse,
   type RetryPolicy,
   selectIdempotentWrites,
@@ -99,7 +95,6 @@ import {
   isProfilesDataset,
   normalizeEventsDataset,
 } from "../utils/events-datasets";
-import { isNumericId } from "../utils/slug-validation";
 import {
   type DashboardUrlOptions,
   getAIConversationsUrl as getAIConversationsUrlUtil,
@@ -1021,7 +1016,6 @@ export class SentryApiService {
       start,
       end,
       aggregateFunctions,
-      groupByFields,
     } = params;
 
     const urlParams = new URLSearchParams();
diff --git a/packages/mcp-core/src/internal/agents/tools/otel-semantics.test.ts b/packages/mcp-core/src/internal/agents/tools/otel-semantics.test.ts
index 127a2c648..b5e62d440 100644
--- a/packages/mcp-core/src/internal/agents/tools/otel-semantics.test.ts
+++ b/packages/mcp-core/src/internal/agents/tools/otel-semantics.test.ts
@@ -1,5 +1,4 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
-import type { SentryApiService } from "../../../api-client";
 
 vi.mock("../logging", () => ({
   logIssue: vi.fn(),
@@ -13,16 +12,9 @@ describe("otel-semantics-lookup", () => {
     vi.clearAllMocks();
   });
 
-  const mockApiService = {} as SentryApiService;
-
   describe("lookupOtelSemantics", () => {
     it("should return namespace information for valid namespace", async () => {
-      const result = await lookupOtelSemantics(
-        "gen_ai",
-        "spans",
-        mockApiService,
-        "test-org",
-      );
+      const result = await lookupOtelSemantics("gen_ai");
 
       expect(result).toContain("# OpenTelemetry Semantic Conventions: gen_ai");
       expect(result).toContain("## Attributes");
@@ -33,29 +25,14 @@ describe("otel-semantics-lookup", () => {
     });
 
     it("should handle namespace with underscore and dash interchangeably", async () => {
-      const result1 = await lookupOtelSemantics(
-        "gen_ai",
-        "spans",
-        mockApiService,
-        "test-org",
-      );
-      const result2 = await lookupOtelSemantics(
-        "gen-ai",
-        "spans",
-        mockApiService,
-        "test-org",
-      );
+      const result1 = await lookupOtelSemantics("gen_ai");
+      const result2 = await lookupOtelSemantics("gen-ai");
 
       expect(result1).toBe(result2);
     });
 
     it("should return all attributes for a namespace", async () => {
-      const result = await lookupOtelSemantics(
-        "http",
-        "spans",
-        mockApiService,
-        "test-org",
-      );
+      const result = await lookupOtelSemantics("http");
 
       expect(result).toContain("total)");
       expect(result).toContain("`http.request.method`");
@@ -63,12 +40,7 @@ describe("otel-semantics-lookup", () => {
     });
 
     it("should return MCP semantic attributes", async () => {
-      const result = await lookupOtelSemantics(
-        "mcp",
-        "spans",
-        mockApiService,
-        "test-org",
-      );
+      const result = await lookupOtelSemantics("mcp");
 
       expect(result).toContain("# OpenTelemetry Semantic Conventions: mcp");
       expect(result).toContain("`mcp.method.name`");
@@ -81,9 +53,6 @@ describe("otel-semantics-lookup", () => {
     it("should handle invalid namespace", async () => {
       const result = await lookupOtelSemantics(
         "totally_invalid_namespace_that_does_not_exist",
-        "spans",
-        mockApiService,
-        "test-org",
       );
 
       expect(result).toContain(
@@ -92,12 +61,7 @@ describe("otel-semantics-lookup", () => {
     });
 
     it("should suggest similar namespaces", async () => {
-      const result = await lookupOtelSemantics(
-        "gen",
-        "spans",
-        mockApiService,
-        "test-org",
-      );
+      const result = await lookupOtelSemantics("gen");
 
       expect(result).toContain("Did you mean:");
       expect(result).toContain("gen_ai");
diff --git a/packages/mcp-core/src/internal/agents/tools/otel-semantics.ts b/packages/mcp-core/src/internal/agents/tools/otel-semantics.ts
index 1f3773409..3bae25e81 100644
--- a/packages/mcp-core/src/internal/agents/tools/otel-semantics.ts
+++ b/packages/mcp-core/src/internal/agents/tools/otel-semantics.ts
@@ -1,9 +1,5 @@
 import { z } from "zod";
-import type { SentryApiService } from "../../../api-client";
-import {
-  type EventsDataset,
-  PUBLIC_EVENTS_DATASETS,
-} from "../../../utils/events-datasets";
+import { PUBLIC_EVENTS_DATASETS } from "../../../utils/events-datasets";
 import { agentTool, recordAgentToolResultCount } from "./utils";
 
 // Import all JSON files directly
@@ -178,13 +174,7 @@ interface NamespaceData {
 /**
  * Lookup OpenTelemetry semantic convention attributes for a given namespace
  */
-export async function lookupOtelSemantics(
-  namespace: string,
-  dataset: EventsDataset,
-  apiService: SentryApiService,
-  organizationSlug: string,
-  projectId?: string,
-): Promise<string> {
+export async function lookupOtelSemantics(namespace: string): Promise<string> {
   // Normalize namespace (replace - with _)
   const normalizedNamespace = namespace.replace(/-/g, "_");
 
@@ -253,14 +243,8 @@ export async function lookupOtelSemantics(
  */
 /**
  * Create a tool for looking up OpenTelemetry semantic convention attributes
- * The tool is pre-bound with the API service and organization configured for the appropriate region
  */
-export function createOtelLookupTool(options: {
-  apiService: SentryApiService;
-  organizationSlug: string;
-  projectId?: string;
-}) {
-  const { apiService, organizationSlug, projectId } = options;
+export function createOtelLookupTool() {
   return agentTool({
     description:
       "Look up OpenTelemetry semantic convention attributes for a specific namespace. OpenTelemetry attributes are universal standards that work across all datasets.",
@@ -276,14 +260,8 @@ export function createOtelLookupTool(options: {
           "REQUIRED: Dataset to check attribute availability in. The agent MUST specify this based on their chosen dataset.",
         ),
     }),
-    execute: async ({ namespace, dataset }) => {
-      return await lookupOtelSemantics(
-        namespace,
-        dataset,
-        apiService,
-        organizationSlug,
-        projectId,
-      );
+    execute: async ({ namespace }) => {
+      return await lookupOtelSemantics(namespace);
     },
   });
 }
diff --git a/packages/mcp-core/src/internal/agents/tools/utils.ts b/packages/mcp-core/src/internal/agents/tools/utils.ts
index 843c92659..a07ec6136 100644
--- a/packages/mcp-core/src/internal/agents/tools/utils.ts
+++ b/packages/mcp-core/src/internal/agents/tools/utils.ts
@@ -9,18 +9,6 @@ import {
 } from "../../../errors";
 import { logIssue, logWarn } from "../../../telem/logging";
 
-/**
- * Standard response schema for all embedded agent tools.
- * Tools return either an error message or the result data, never both.
- */
-const AgentToolResponseSchema = z.object({
-  error: z
-    .string()
-    .optional()
-    .describe("Error message if the operation failed"),
-  result: z.unknown().optional().describe("The successful result data"),
-});
-
 export type AgentToolResponse<T = unknown> = {
   error?: string;
   result?: T;
diff --git a/packages/mcp-core/src/internal/fetch-utils.test.ts b/packages/mcp-core/src/internal/fetch-utils.test.ts
index 467859d90..bb4fdaa1c 100644
--- a/packages/mcp-core/src/internal/fetch-utils.test.ts
+++ b/packages/mcp-core/src/internal/fetch-utils.test.ts
@@ -208,7 +208,6 @@ describe("fetch-utils", () => {
 
     it("caps delay at 30 seconds", async () => {
       const fn = vi.fn();
-      const callCount = 0;
 
       // Mock function that fails many times
       for (let i = 0; i < 10; i++) {
diff --git a/packages/mcp-core/src/internal/fetch-utils.ts b/packages/mcp-core/src/internal/fetch-utils.ts
index cee0fcc1b..5c069ff05 100644
--- a/packages/mcp-core/src/internal/fetch-utils.ts
+++ b/packages/mcp-core/src/internal/fetch-utils.ts
@@ -45,7 +45,7 @@ export async function retryWithBackoff<T>(
   {
     maxRetries = 3,
     initialDelay = 1000,
-    shouldRetry = (error: unknown) => true,
+    shouldRetry = () => true,
   }: {
     maxRetries?: number;
     initialDelay?: number;
diff --git a/packages/mcp-core/src/internal/formatting.test.ts b/packages/mcp-core/src/internal/formatting.test.ts
index cf9176e60..54c67f810 100644
--- a/packages/mcp-core/src/internal/formatting.test.ts
+++ b/packages/mcp-core/src/internal/formatting.test.ts
@@ -19,22 +19,6 @@ import {
 } from "./test-fixtures";
 
 // Helper functions to reduce duplication in event creation
-function createPythonExceptionEvent(
-  errorType: string,
-  errorMessage: string,
-  frames: any[],
-): Event {
-  return new EventBuilder("python")
-    .withException(
-      createExceptionValue({
-        type: errorType,
-        value: errorMessage,
-        stacktrace: createStackTrace(frames),
-      }),
-    )
-    .build();
-}
-
 function createSimpleExceptionEvent(
   platform: string,
   errorType: string,
diff --git a/packages/mcp-core/src/internal/formatting.ts b/packages/mcp-core/src/internal/formatting.ts
index 2da18eb80..e4bc2df91 100644
--- a/packages/mcp-core/src/internal/formatting.ts
+++ b/packages/mcp-core/src/internal/formatting.ts
@@ -418,13 +418,7 @@ function formatExceptionInterfaceOutput(
     // Add language-specific chain indicator for multiple exceptions
     if (isChained && index > 0) {
       parts.push("");
-      parts.push(
-        getExceptionChainMessage(
-          event.platform || null,
-          index,
-          exceptions.length,
-        ),
-      );
+      parts.push(getExceptionChainMessage(event.platform || null, index));
       parts.push("");
     }
 
@@ -494,7 +488,6 @@ function formatExceptionInterfaceOutput(
 function getExceptionChainMessage(
   platform: string | null,
   index: number,
-  totalExceptions: number,
 ): string {
   // Default message for unknown platforms
   const defaultMessage =
@@ -1553,10 +1546,7 @@ function formatN1QueryEvidence(
  * This is lower priority as the generic evidenceDisplay fields usually
  * provide sufficient information for slow query issues.
  */
-function formatSlowDbQueryEvidence(
-  evidenceData: SlowDbEvidenceData,
-  spansData: unknown,
-): string {
+function formatSlowDbQueryEvidence(evidenceData: SlowDbEvidenceData): string {
   const parts: string[] = [];
 
   // Show parent span if available (generic field that applies to slow queries)
@@ -1632,7 +1622,7 @@ function formatPerformanceIssueOutput(
       }
 
       case KNOWN_PERFORMANCE_ISSUE_TYPES.SLOW_DB_QUERY: {
-        const result = formatSlowDbQueryEvidence(evidenceData, spansData);
+        const result = formatSlowDbQueryEvidence(evidenceData);
         if (result) parts.push(result);
         break;
       }
diff --git a/packages/mcp-core/src/telem/sentry.ts b/packages/mcp-core/src/telem/sentry.ts
index a4f097e5a..dc2036b7c 100644
--- a/packages/mcp-core/src/telem/sentry.ts
+++ b/packages/mcp-core/src/telem/sentry.ts
@@ -92,7 +92,7 @@ function scrubValue(value: unknown, depth = 0): [unknown, boolean, string[]] {
  * Sentry beforeSend hook that scrubs sensitive data from events
  * and applies custom fingerprinting for specific error types.
  */
-export function sentryBeforeSend(event: any, hint: any): any {
+export function sentryBeforeSend(event: any, _hint: any): any {
   // Custom fingerprinting for AI SDK API call errors.
   // These errors share the same stack trace but have different messages
   // (e.g., "Country, region, or territory not supported", temperature issues).
diff --git a/packages/mcp-core/src/tools/catalog/get-doc.ts b/packages/mcp-core/src/tools/catalog/get-doc.ts
index cbd9aba52..3da8dbc0d 100644
--- a/packages/mcp-core/src/tools/catalog/get-doc.ts
+++ b/packages/mcp-core/src/tools/catalog/get-doc.ts
@@ -4,7 +4,6 @@ import { ApiError } from "../../api-client/index";
 import { UserInputError } from "../../errors";
 import { fetchWithTimeout } from "../../internal/fetch-utils";
 import { defineTool } from "../../internal/tool-helpers/define";
-import type { ServerContext } from "../../types";
 import { getUserAgent } from "../../version";
 
 const DOC_NOT_FOUND_MESSAGE =
@@ -54,7 +53,7 @@ export default defineTool({
     destructiveHint: false,
     openWorldHint: true,
   },
-  async handler(params, context: ServerContext) {
+  async handler(params) {
     const docContext = { "doc.path": params.path };
     setTags(docContext);
     setAttributes(docContext);
diff --git a/packages/mcp-core/src/tools/catalog/get-issue-details.ts b/packages/mcp-core/src/tools/catalog/get-issue-details.ts
index 5163a6dbd..e70a9efdc 100644
--- a/packages/mcp-core/src/tools/catalog/get-issue-details.ts
+++ b/packages/mcp-core/src/tools/catalog/get-issue-details.ts
@@ -10,7 +10,6 @@ import type {
   ExternalIssueList,
   Issue,
   Trace,
-  TransactionEvent,
 } from "../../api-client/types";
 import { ConfigurationError, UserInputError } from "../../errors";
 import type { CodeLocation } from "../../internal/code-location";
@@ -895,10 +894,6 @@ function isErrorEvent(event: Event): event is ErrorEvent | DefaultEvent {
   return event.type === "error" || event.type === "default";
 }
 
-function isTransactionEvent(event: Event): event is TransactionEvent {
-  return event.type === "transaction";
-}
-
 function shouldFetchTraceForEvent(event: Event): { traceId: string } | null {
   // Only fetch traces for non-error events (transactions, profiling, etc.)
   if (isErrorEvent(event)) {
diff --git a/packages/mcp-core/src/tools/support/profile/analyzer.ts b/packages/mcp-core/src/tools/support/profile/analyzer.ts
index 6d54eb994..05eb8490c 100644
--- a/packages/mcp-core/src/tools/support/profile/analyzer.ts
+++ b/packages/mcp-core/src/tools/support/profile/analyzer.ts
@@ -352,12 +352,11 @@ export function compareFrameStats(
   // Compare frames that exist in both
   const comparisons: FrameComparison[] = [];
 
-  for (const [fingerprint, indices] of frameMap.entries()) {
+  for (const indices of frameMap.values()) {
     if (indices.baselineIdx === undefined || indices.currentIdx === undefined) {
       continue; // Frame only in one dataset
     }
 
-    const baselineFrame = baselineFrames[indices.baselineIdx];
     const currentFrame = currentFrames[indices.currentIdx];
     const baselineInfo =
       baselineInfos[indices.baselineIdx] || DEFAULT_FRAME_INFO;
diff --git a/packages/mcp-core/src/tools/support/search-attributes/search.ts b/packages/mcp-core/src/tools/support/search-attributes/search.ts
index 42fc333d7..6dcd32e2b 100644
--- a/packages/mcp-core/src/tools/support/search-attributes/search.ts
+++ b/packages/mcp-core/src/tools/support/search-attributes/search.ts
@@ -1,4 +1,3 @@
-import type { TraceItemType } from "../../../api-client";
 import { apiServiceFromContext } from "../../../internal/tool-helpers/api";
 import { setTargetTagsAndAttributes } from "../../../telem/scope";
 import type { ServerContext } from "../../../types";
diff --git a/packages/mcp-core/src/tools/support/search-events/agent.ts b/packages/mcp-core/src/tools/support/search-events/agent.ts
index 8c727cf14..79bc3efa0 100644
--- a/packages/mcp-core/src/tools/support/search-events/agent.ts
+++ b/packages/mcp-core/src/tools/support/search-events/agent.ts
@@ -208,11 +208,7 @@ export async function searchEventsAgent(
     organizationSlug: options.organizationSlug,
     projectId: options.projectId,
   });
-  const otelLookupTool = createOtelLookupTool({
-    apiService: options.apiService,
-    organizationSlug: options.organizationSlug,
-    projectId: options.projectId,
-  });
+  const otelLookupTool = createOtelLookupTool();
   const replayFieldsTool = createDatasetFieldsTool({
     apiService: options.apiService,
     organizationSlug: options.organizationSlug,
diff --git a/packages/mcp-server-mocks/src/index.ts b/packages/mcp-server-mocks/src/index.ts
index f5e900d24..f8cfd34d9 100644
--- a/packages/mcp-server-mocks/src/index.ts
+++ b/packages/mcp-server-mocks/src/index.ts
@@ -1102,7 +1102,7 @@ export const restHandlers = buildHandlers([
           fields.length > 0 ? null : "Orderby must also be a selected field",
       }));
 
-      const environmentResults = environments.map((environment) => ({
+      const environmentResults = environments.map(() => ({
         valid: true,
         error: null,
       }));
@@ -1455,8 +1455,7 @@ export const restHandlers = buildHandlers([
   {
     method: "post",
     path: "/api/0/projects/sentry-mcp-evals/cloudflare-mcp/teams/:teamSlug/",
-    fetch: async ({ request, params }) => {
-      const body = (await request.json()) as any;
+    fetch: async ({ params }) => {
       const teamSlug = params.teamSlug as string;
       return HttpResponse.json({
         ...teamFixture,
diff --git a/packages/mcp-test-client/src/logger.test.ts b/packages/mcp-test-client/src/logger.test.ts
index 7a567375a..3735a4ee0 100644
--- a/packages/mcp-test-client/src/logger.test.ts
+++ b/packages/mcp-test-client/src/logger.test.ts
@@ -12,17 +12,14 @@ import {
 } from "./logger.js";
 
 describe("Logger", () => {
-  let processStdoutWriteSpy: ReturnType<typeof vi.spyOn>;
   let capturedOutput: string;
 
   beforeEach(() => {
     capturedOutput = "";
-    processStdoutWriteSpy = vi
-      .spyOn(process.stdout, "write")
-      .mockImplementation((chunk) => {
-        capturedOutput += chunk;
-        return true;
-      });
+    vi.spyOn(process.stdout, "write").mockImplementation((chunk) => {
+      capturedOutput += chunk;
+      return true;
+    });
   });
 
   afterEach(() => {