diff --git a/mcp-server/CHANGELOG.md b/mcp-server/CHANGELOG.md
index 4e75f25..471ff8b 100644
--- a/mcp-server/CHANGELOG.md
+++ b/mcp-server/CHANGELOG.md
@@ -8,7 +8,9 @@
 
 ### Fixed
 
-* `currents-list-affected-tests`: serialize `action_type` query params as `action_type[]` to match OpenAPI.
+* `currents-list-affected-tests`: serialize `action_type` as repeated `action_type` query keys (OpenAPI `style: form`, `explode: true`).
+* `currents-get-runs`: serialize `status` and `completion_state` as repeated query keys (OpenAPI `style: form`, `explode: true`); add optional `pr_id` query param per OpenAPI list runs.
+* MCP tools intentionally omit deprecated-only OpenAPI query parameters (for example `tag[]` on find run).
 * `currents-update-webhook`: require at least one updatable field so the HTTP request body is never empty (matches OpenAPI `requestBody.required: true`).
 * `postApi`: treat HTTP 201 and empty JSON bodies like other successful POST responses.
 
diff --git a/mcp-server/src/tools/actions/list-affected-tests.test.ts b/mcp-server/src/tools/actions/list-affected-tests.test.ts
index df963db..460b90f 100644
--- a/mcp-server/src/tools/actions/list-affected-tests.test.ts
+++ b/mcp-server/src/tools/actions/list-affected-tests.test.ts
@@ -9,7 +9,7 @@ describe("listAffectedTestsTool", () => {
     vi.clearAllMocks();
   });
 
-  it("serializes action_type as action_type[] per OpenAPI", async () => {
+  it("serializes action_type as repeated action_type per OpenAPI (form explode)", async () => {
     vi.spyOn(request, "fetchApi").mockResolvedValue({ status: "OK", data: [] });
 
     await listAffectedTestsTool.handler({
@@ -20,10 +20,10 @@ describe("listAffectedTestsTool", () => {
     });
 
     expect(request.fetchApi).toHaveBeenCalledWith(
-      expect.stringContaining("action_type%5B%5D=skip")
+      expect.stringContaining("action_type=skip")
     );
     expect(request.fetchApi).toHaveBeenCalledWith(
-      expect.stringContaining("action_type%5B%5D=tag")
+      expect.stringContaining("action_type=tag")
     );
   });
 });
diff --git a/mcp-server/src/tools/actions/list-affected-tests.ts b/mcp-server/src/tools/actions/list-affected-tests.ts
index c438242..fabd3bd 100644
--- a/mcp-server/src/tools/actions/list-affected-tests.ts
+++ b/mcp-server/src/tools/actions/list-affected-tests.ts
@@ -74,7 +74,7 @@ const handler = async ({
   }
 
   if (action_type && action_type.length > 0) {
-    action_type.forEach((t) => queryParams.append("action_type[]", t));
+    action_type.forEach((t) => queryParams.append("action_type", t));
   }
 
   if (action_id) {
diff --git a/mcp-server/src/tools/runs/get-runs.test.ts b/mcp-server/src/tools/runs/get-runs.test.ts
new file mode 100644
index 0000000..2675f2f
--- /dev/null
+++ b/mcp-server/src/tools/runs/get-runs.test.ts
@@ -0,0 +1,28 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import * as request from "../../lib/request.js";
+import { getRunsTool } from "./get-runs.js";
+
+vi.mock("../../lib/request.js");
+
+describe("getRunsTool", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("serializes list runs query per OpenAPI (repeated status, completion_state, pr_id)", async () => {
+    vi.spyOn(request, "fetchApi").mockResolvedValue({ status: "OK", data: [] });
+
+    await getRunsTool.handler({
+      projectId: "p1",
+      status: ["PASSED", "FAILED"],
+      completion_state: ["COMPLETE"],
+      pr_id: "42",
+    });
+
+    const url = vi.mocked(request.fetchApi).mock.calls[0][0] as string;
+    expect(url).toContain("status=PASSED");
+    expect(url).toContain("status=FAILED");
+    expect(url).toContain("completion_state=COMPLETE");
+    expect(url).toContain("pr_id=42");
+  });
+});
diff --git a/mcp-server/src/tools/runs/get-runs.ts b/mcp-server/src/tools/runs/get-runs.ts
index fbb2f56..12502be 100644
--- a/mcp-server/src/tools/runs/get-runs.ts
+++ b/mcp-server/src/tools/runs/get-runs.ts
@@ -42,6 +42,15 @@ const zodSchema = z.object({
     .max(200)
     .optional()
     .describe("Search runs by ciBuildId or commit message. Case-insensitive."),
+  pr_id: z
+    .string()
+    .min(1)
+    .max(128)
+    .regex(/^[!-~]+$/)
+    .optional()
+    .describe(
+      "Filter runs by normalized pull request id (meta.pr.id). Printable ASCII only, max 128 characters."
+    ),
   authors: z
     .array(z.string())
     .optional()
@@ -73,6 +82,7 @@ const handler = async ({
   tags,
   tag_operator,
   search,
+  pr_id,
   authors,
   status,
   completion_state,
@@ -106,6 +116,10 @@ const handler = async ({
     queryParams.append("search", search);
   }
 
+  if (pr_id) {
+    queryParams.append("pr_id", pr_id);
+  }
+
   if (authors && authors.length > 0) {
     authors.forEach((a) => queryParams.append("authors[]", a));
   }