diff --git a/packages/adapter-utils/src/command-redaction.test.ts b/packages/adapter-utils/src/command-redaction.test.ts
index 68ea18478e..d384e3c325 100644
--- a/packages/adapter-utils/src/command-redaction.test.ts
+++ b/packages/adapter-utils/src/command-redaction.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it } from "vitest";
 import {
   REDACTED_COMMAND_TEXT_VALUE,
+  redactCommandText,
   redactDiagnosticText,
 } from "./command-redaction.js";
 
@@ -93,3 +94,95 @@ second-line\" status=401`;
     expect(output).toContain(REDACTED_COMMAND_TEXT_VALUE);
   });
 });
+
+describe("redactCommandText header secrets", () => {
+  it("redacts a double-quoted X-API-Key header value", () => {
+    const input = 'curl -H "X-API-Key: abc" https://example.test/api/agents/me';
+    const output = redactCommandText(input);
+    expect(output).not.toContain("abc");
+    expect(output).toBe(
+      `curl -H "X-API-Key: ${REDACTED_COMMAND_TEXT_VALUE}" https://example.test/api/agents/me`,
+    );
+  });
+
+  it("redacts a single-quoted lowercase x-api-key header value", () => {
+    const input = "curl -H 'x-api-key: abc' https://example.test/api/agents/me";
+    const output = redactCommandText(input);
+    expect(output).not.toContain("abc");
+    expect(output).toBe(
+      `curl -H 'x-api-key: ${REDACTED_COMMAND_TEXT_VALUE}' https://example.test/api/agents/me`,
+    );
+  });
+
+  it("redacts an unquoted header value and other credential header names", () => {
+    expect(redactCommandText("curl -H X-API-Key:abc https://example.test")).toBe(
+      `curl -H X-API-Key:${REDACTED_COMMAND_TEXT_VALUE} https://example.test`,
+    );
+    expect(redactCommandText('curl -H "Api-Key: abc"')).toBe(
+      `curl -H "Api-Key: ${REDACTED_COMMAND_TEXT_VALUE}"`,
+    );
+    expect(redactCommandText('curl -H "X-Auth-Token: abc"')).toBe(
+      `curl -H "X-Auth-Token: ${REDACTED_COMMAND_TEXT_VALUE}"`,
+    );
+    expect(redactCommandText('curl -H "X-Paperclip-Api-Key: abc"')).toBe(
+      `curl -H "X-Paperclip-Api-Key: ${REDACTED_COMMAND_TEXT_VALUE}"`,
+    );
+  });
+
+  it("keeps a non-secret header untouched", () => {
+    const input = 'curl -H "Content-Type: application/json" -H "Accept: application/json" https://example.test';
+    expect(redactCommandText(input)).toBe(input);
+  });
+
+  it("keeps the bearer header output byte for byte identical", () => {
+    // The bearer rule already redacted this shape. The header rule keeps the
+    // scheme, so the output must not change.
+    const input = 'curl -H "Authorization: Bearer abc" https://example.test';
+    expect(redactCommandText(input)).toBe(
+      `curl -H "Authorization: Bearer ${REDACTED_COMMAND_TEXT_VALUE}" https://example.test`,
+    );
+  });
+
+  it("now redacts a basic authorization header value", () => {
+    const input = 'curl -H "Authorization: Basic dXNlcjpwdw==" https://example.test';
+    const output = redactCommandText(input);
+    expect(output).not.toContain("dXNlcjpwdw==");
+    expect(output).toBe(
+      `curl -H "Authorization: Basic ${REDACTED_COMMAND_TEXT_VALUE}" https://example.test`,
+    );
+  });
+
+  it("does not start a match at an escaped quote after the colon", () => {
+    // A serialized diagnostic writes a quoted header value as `\"`. The value
+    // pattern excludes the backslash, so the rule leaves this shape to the
+    // caller's own authorization rules instead of redacting the escape itself.
+    const input = String.raw`prefix Authorization: \"Bearer nested\" suffix`;
+    expect(redactCommandText(input)).toBe(input);
+  });
+
+  it("redacts a header secret inside a serialized command string", () => {
+    const input = String.raw`{"command":"curl -H \"X-API-Key: abc\" https://example.test"}`;
+    const output = redactCommandText(input);
+    expect(output).not.toContain("abc");
+    expect(output).toBe(
+      String.raw`{"command":"curl -H \"X-API-Key: ` +
+        REDACTED_COMMAND_TEXT_VALUE +
+        String.raw`\" https://example.test"}`,
+    );
+  });
+
+  it("is idempotent over a header secret", () => {
+    const input = 'curl -H "X-API-Key: abc" -H "Authorization: Bearer def"';
+    const once = redactCommandText(input);
+    expect(redactCommandText(once)).toBe(once);
+    expect(redactDiagnosticText(once)).toBe(once);
+  });
+
+  it("redacts a header secret inside a diagnostic and keeps a JSON secret field working", () => {
+    const input = 'command failed: curl -H "X-API-Key: abc" -> {"token":"opaque-value"}';
+    const output = redactDiagnosticText(input);
+    expect(output).not.toContain("abc");
+    expect(output).not.toContain("opaque-value");
+    expect(output).toContain("command failed:");
+  });
+});
diff --git a/packages/adapter-utils/src/command-redaction.ts b/packages/adapter-utils/src/command-redaction.ts
index 5890973961..2d00e17f36 100644
--- a/packages/adapter-utils/src/command-redaction.ts
+++ b/packages/adapter-utils/src/command-redaction.ts
@@ -18,6 +18,31 @@ const COMMAND_ENV_SECRET_ASSIGNMENT_RE = new RegExp(
 );
 const COMMAND_AUTHORIZATION_BEARER_RE =
   /(\bAuthorization\s*:\s*Bearer\s+)[^\s"'`]+/gi;
+// A secret-bearing header names a credential in its own header name. The
+// public Paperclip API documents `X-API-Key`, and a run log can also carry
+// `Api-Key`, `X-Auth-Token`, or `X-Paperclip-Api-Key`. The command redaction
+// handled `Authorization: Bearer <value>` only, so a `curl -H "X-API-Key:
+// <value>"` command kept the credential in clear. This rule redacts the value
+// of any header whose name contains an api-key, token, secret, or auth hint.
+//
+// The rule keeps an optional auth scheme in the output. The scheme is not a
+// secret, and it tells a reader which credential form the command used. This
+// also makes the rule agree byte for byte with the bearer rule above, so
+// `Authorization: Bearer <value>` produces the same output as before.
+//
+// The header name and the colon match on one line only, and the value ends at
+// the first quote, backslash, or whitespace. The rule therefore stops at the
+// end of one header argument and never runs past it. Excluding the backslash
+// also keeps the rule off an escaped-quote opener such as
+// `Authorization: \"Bearer ...\"` in a serialized diagnostic, which the
+// caller's own authorization rules already redact.
+const COMMAND_SECRET_HEADER_NAME_PATTERN = String.raw`[A-Za-z0-9_-]*(?:api[-_]?key|token|secret|auth)[A-Za-z0-9_-]*`;
+const COMMAND_SECRET_HEADER_RE = new RegExp(
+  String.raw`(\b${COMMAND_SECRET_HEADER_NAME_PATTERN}[ \t]*:[ \t]*(?:(?:Bearer|Basic|Digest|Token)[ \t]+)?)[^\s\\"'` +
+    "`" +
+    String.raw`]+`,
+  "gi",
+);
 const COMMAND_OPENAI_KEY_RE = /\bsk-[A-Za-z0-9_-]{12,}\b/g;
 const COMMAND_GITHUB_TOKEN_RE = /\bgh[pousr]_[A-Za-z0-9_]{20,}\b/g;
 const COMMAND_JWT_RE =
@@ -58,6 +83,7 @@ export function redactCommandText(
   if (!maybeContainsSecretText(command)) return command;
   return command
     .replace(COMMAND_AUTHORIZATION_BEARER_RE, `$1${redactedValue}`)
+    .replace(COMMAND_SECRET_HEADER_RE, `$1${redactedValue}`)
     .replace(COMMAND_CLI_SECRET_OPTION_RE, `$1${redactedValue}$3`)
     .replace(
       COMMAND_ENV_SECRET_ASSIGNMENT_RE,