Received-SPF: pass (google.com: domain of postmaster@cio121019.openrouter.ai designates 159.112.253.125 as permitted sender) client-ip=159.112.253.125;
Date: Fri, 27 Mar 2026 21:25:37 +0000
Mime-Version: 1.0
Content-Type: multipart/alternative;
 boundary="d60a7af03e942c6dc46fe42d86f2a31932d4e3afae6ab8330abb1e7aa181"
Subject: Tool calling that just works
From: OpenRouter Team <welcome@openrouter.ai>
To: tjphuhs@gmail.com
Message-Id: <20260327212537.98a8b9321f00f645@cio121019.openrouter.ai>

--d60a7af03e942c6dc46fe42d86f2a31932d4e3afae6ab8330abb1e7aa181
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="utf-8"

OpenRouter

OpenRouter ( https://openrouter.ai/?utm_campaign=3DWelcome+Email+Campaign+%=
232&utm_content=3DToolCalling-email&utm_medium=3Demail_action&utm_source=3D=
customer.io )

Hi=C2=A0T,

Tool calls ( https://openrouter.ai/docs/guides/features/tool-calling?utm_ca=
mpaign=3DWelcome+Email+Campaign+%232&utm_content=3DToolCalling-email&utm_me=
dium=3Demail_action&utm_source=3Dcustomer.io ) give an LLM the ability to i=
nteract with the outside world, as well as power agentic workflows.

OpenRouter standardizes the tool calling interface across models and provid=
ers, making it easy to integrate external tools with any supported model.

You can find models that support tool calling by filtering on the models pa=
ge ( openrouter.ai/models?supported_parameters=3Dtools&utm_campaign=3DWelco=
me+Email+Campaign+%232&utm_content=3DToolCalling-email&utm_medium=3Demail_a=
ction&utm_source=3Dcustomer.io ).=C2=A0

Learn more about tool calling, including examples such as =E2=80=9Cmulti-le=
vel research with reasoning ( https://openrouter.ai/docs/guides/features/to=
ol-calling?utm_campaign=3DWelcome+Email+Campaign+%232&utm_content=3DToolCal=
ling-email&utm_medium=3Demail_action&utm_source=3Dcustomer.io#example-multi=
-step-research-with-reasoning )=E2=80=9D,=C2=A0and its corresponding code s=
nippets in the documentation ( https://openrouter.ai/docs/guides/features/t=
ool-calling?utm_campaign=3DWelcome+Email+Campaign+%232&utm_content=3DToolCa=
lling-email&utm_medium=3Demail_action&utm_source=3Dcustomer.io ).

Happy tool calling!

Best,
OpenRouter Team
For questions or comments, reach out to us on X ( https://x.com/openroutera=
i?utm_campaign=3DWelcome+Email+Campaign+%232&utm_content=3DToolCalling-emai=
l&utm_medium=3Demail_action&utm_source=3Dcustomer.io )=C2=A0or on Discord (=
 https://discord.com/invite/8TpuzNXQYr?utm_campaign=3DWelcome+Email+Campaig=
n+%232&utm_content=3DToolCalling-email&utm_medium=3Demail_action&utm_source=
=3Dcustomer.io ).

Unsubscribe here. ( https://track.customer.io/manage_subscription_preferenc=
es/dgSE_QoLAIvZ9gKK2fYCAZ0xMCn8i2XObYEbsYVYTQ=3D=3D )

=E2=80=8B=E2=80=8B
--d60a7af03e942c6dc46fe42d86f2a31932d4e3afae6ab8330abb1e7aa181
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="utf-8"

<!DOCTYPE html><html lang=3D"und" dir=3D"auto" xmlns:v=3D"urn:schemas-micro=
soft-com:vml" xmlns:o=3D"urn:schemas-microsoft-com:office:office"><head>
      <meta charset=3D"utf-8"/>
      <meta http-equiv=3D"X-UA-Compatible" content=3D"IE=3Dedge"/>
      <meta name=3D"viewport" content=3D"width=3Ddevice-width, initial-scal=
e=3D1, user-scalable=3Dyes"/>
      <meta name=3D"format-detection" content=3D"telephone=3Dno, date=3Dno,=
 address=3Dno, email=3Dno, url=3Dno"/>
      <meta name=3D"x-apple-disable-message-reformatting"/>
      <meta name=3D"color-scheme" content=3D"normal"/>
      <meta name=3D"supported-color-schemes" content=3D"normal"/>
      <title>Tool calling that just works</title>
      <!--[if mso]>
        <noscript>
          <xml>
            <o:OfficeDocumentSettings>
              <o:PixelsPerInch>96</o:PixelsPerInch>
            </o:OfficeDocumentSettings>
          </xml>
        </noscript>
      <![endif]-->
      <style>
        :root {
          color-scheme: normal;
          supported-color-schemes: normal;
        }
      </style>
      <style>
        .x-wrapper {
          -webkit-font-smoothing: antialiased;
          -moz-osx-font-smoothing: grayscale;
        }
        a[x-apple-data-detectors]{
          word-break:normal;
        }
      </style>
      <style>
        body {
          margin: 0;
          padding:0 !important;
        }
        table.mso {
          mso-cellspacing: 0;
          padding: 0;
          font-size: medium;
          line-height: 150%;
          font-family: Helvetica, sans-serif;
        }
        table.mso td{
          vertical-align: top;
        }
        h1,h2,h3,h4,h5,h6,p,li,td{mso-hyphenate: none;}
      </style>
      <style>.c1x30091{max-width:100% !important;}.covbl52{mso-ansi-font-si=
ze:0;}@media (prefers-color-scheme: dark) { .ca49raw{color:#ffffff !importa=
nt;} .c1w0zajv{background:#000000 !important;} .c19284yn{display:inline-blo=
ck !important;vertical-align:middle;max-width:100%;width:479px;color:#fffff=
f !important;margin-block:0 !important;} .cww8v4j{display:none !important;}=
 .c385pa7{color:rgb(255, 255, 255) !important;} }</style><style data-isolat=
ed=3D"thunderbird" media=3D"(prefers-color-scheme: dark)">
=2Emoz-text-html .ca49raw{color:#ffffff !important;}
=2Emoz-text-html .c1w0zajv{background:#000000 !important;}
=2Emoz-text-html .c385pa7{color:rgb(255=
, 255, 255) !important;}</style></head=
>
    <body class=3D"body" style=3D"background: #fefefe;">
      <div role=3D"article" aria-roledescription=3D"email" aria-label=3D"To=
ol calling that just works" lang=3D"und" dir=3D"auto" style=3D"font-size: m=
ax(16px, 1rem);color: #000000; background: #fefefe; line-height: 1.5; mso-l=
ine-height-alt: 150%; font-family: Helvetica, sans-serif; word-break: norma=
l; word-wrap: normal; word-spacing: normal;" class=3D"ca49raw x-wrapper">
       =20
         =20
 =20
  <div style=3D"background: #fefefe;" class=3D"c1w0zajv">
   =20
  <!--[if true]><table
    role=3D"none"
    class=3D"mso"
    align=3D"left"
    style=3D"width: 100%; background-color: #fefefe;"
  >
    <tr>
      <td></td><td style=3D"width: 640px; border: 2px solid #000000; paddin=
g: 20px;">
        <![endif]--><!--[if !true]><! --><div style=3D"max-width: 640px; ma=
rgin-left: auto; margin-right: auto;">
        <div style=3D"border: 2px solid #000000;">
          <!-- <![endif]--><div style=3D"color: rgb(0, 0, 0); padding: 20px=
; overflow: auto;" class=3D"ca49raw">
           =20
     =20
 =20
   =20
     =20
       =20
       =20
          <div style=3D"color: rgb(0, 0, 0); overflow: auto;" class=3D"ca49=
raw">
           =20
  <div style=3D"text-align: center;" class=3D"covbl52">
  <a href=3D"https://email-v3.openrouter.ai/e/c/eyJlbWFpbF9pZCI6ImRnU0VfUW9=
MQUl2WjlnS0syZllDQVoweE1DbjhpMlhPYllFYnNZVllUUT09IiwiaHJlZiI6Imh0dHBzOi8vb3=
BlbnJvdXRlci5haS8_dXRtX2NhbXBhaWduPVdlbGNvbWUrRW1haWwrQ2FtcGFpZ24rJTIzMlx1M=
DAyNnV0bV9jb250ZW50PVRvb2xDYWxsaW5nLWVtYWlsXHUwMDI2dXRtX21lZGl1bT1lbWFpbF9h=
Y3Rpb25cdTAwMjZ1dG1fc291cmNlPWN1c3RvbWVyLmlvIiwiaW50ZXJuYWwiOiI4NGZkMGFjYzA=
xY2E5NDAxOGJkOWY2MDIiLCJsaW5rX2lkIjoxMDd9/753ca1dbeffac90f8e623ebb20527610c=
8613a3d52af7153a942296e4bef8342" style=3D"text-decoration: none; display: i=
nline-block;">
     =20
     =20
        <picture>
          <source srcset=3D"https://userimg-assets.customeriomail.com/image=
s/client-env-179844/1761144858328_logo_white_01K866KSVWVF5RN807Q9JYKTVG.png=
" media=3D"(prefers-color-scheme: dark)"/><img class=3D"c1x30091 cww8v4j" s=
rc=3D"https://userimg-assets.customeriomail.com/images/client-env-179844/t7=
-big1_01K8NWZF15VM5RY9E6024YVBN2.png" alt=3D"OpenRouter" width=3D"479" styl=
e=3D"vertical-align: middle; max-width: 100%; width: 479px;"/>
        </picture>
        <!--[if !mso]><! -->
          <img src=3D"https://userimg-assets.customeriomail.com/images/clie=
nt-env-179844/1761144858328_logo_white_01K866KSVWVF5RN807Q9JYKTVG.png" styl=
e=3D"display:none;" alt=3D"OpenRouter" class=3D"c19284yn"/><!-- <![endif]--=
></a></div>
 =20
          </div>
         =20
     =20
       =20
     =20
 =20
 =20
 =20
  <p style=3D"color: #000000; margin: 16px 0;" class=3D"c385pa7">Hi=C2=A0T,=
</p>
 =20
 =20
  <p style=3D"margin: 16px 0;"><a class=3D"inline-link" href=3D"https://ema=
il-v3.openrouter.ai/e/c/eyJlbWFpbF9pZCI6ImRnU0VfUW9MQUl2WjlnS0syZllDQVoweE1=
DbjhpMlhPYllFYnNZVllUUT09IiwiaHJlZiI6Imh0dHBzOi8vb3BlbnJvdXRlci5haS9kb2NzL2=
d1aWRlcy9mZWF0dXJlcy90b29sLWNhbGxpbmc_dXRtX2NhbXBhaWduPVdlbGNvbWUrRW1haWwrQ=
2FtcGFpZ24rJTIzMlx1MDAyNnV0bV9jb250ZW50PVRvb2xDYWxsaW5nLWVtYWlsXHUwMDI2dXRt=
X21lZGl1bT1lbWFpbF9hY3Rpb25cdTAwMjZ1dG1fc291cmNlPWN1c3RvbWVyLmlvIiwiaW50ZXJ=
uYWwiOiI4NGZkMGFjYzAxY2E5NDAxOGJkOWY2MDIiLCJsaW5rX2lkIjo3Njl9/6bc02fe3995c0=
5264f89c4a0cf0a8f8881777c75578ab1a83a1fc7927ca47b56" style=3D"text-decorati=
on: underline;color: #6367f0;font-weight: 500;">Tool calls</a> give an LLM =
the ability to interact with the outside world, as well as power agentic wo=
rkflows.</p>
 =20
 =20
  <p style=3D"margin: 16px 0;">OpenRouter standardizes the tool calling int=
erface across models and providers, making it easy to integrate external to=
ols with any supported model.</p>
 =20
 =20
  <p style=3D"margin: 16px 0;">You can find models that support tool callin=
g by filtering on the <a class=3D"inline-link" href=3D"openrouter.ai/models=
?supported_parameters=3Dtools&amp;utm_campaign=3DWelcome+Email+Campaign+%23=
2&amp;utm_content=3DToolCalling-email&amp;utm_medium=3Demail_action&amp;utm=
_source=3Dcustomer.io" style=3D"text-decoration: underline;color: #6367f0;f=
ont-weight: 500;">models page</a>.=C2=A0</p>
 =20
 =20
  <p style=3D"margin: 16px 0;">Learn more about tool calling<span style=3D"=
box-sizing: border-box; margin: 0px; padding: 0px;">, including examples su=
ch as =E2=80=9C<a class=3D"inline-link" href=3D"https://email-v3.openrouter=
=2Eai/e/c/eyJlbWFpbF9pZCI6ImRnU0VfUW9MQ=
Ul2WjlnS0syZllDQVoweE1DbjhpMlhPYllFYnN=
ZVllUUT09IiwiaHJlZiI6Imh0dHBzOi8vb3BlbnJvdXRlci5haS9kb2NzL2d1aWRlcy9mZWF0dX=
Jlcy90b29sLWNhbGxpbmc_dXRtX2NhbXBhaWduPVdlbGNvbWUrRW1haWwrQ2FtcGFpZ24rJTIzM=
lx1MDAyNnV0bV9jb250ZW50PVRvb2xDYWxsaW5nLWVtYWlsXHUwMDI2dXRtX21lZGl1bT1lbWFp=
bF9hY3Rpb25cdTAwMjZ1dG1fc291cmNlPWN1c3RvbWVyLmlvI2V4YW1wbGUtbXVsdGktc3RlcC1=
yZXNlYXJjaC13aXRoLXJlYXNvbmluZyIsImludGVybmFsIjoiODRmZDBhY2MwMWNhOTQwMThiZD=
lmNjAyIiwibGlua19pZCI6NzcwfQ/99f92273ecc5f3b3472c1f29da07fb192987c5461cae2f=
8d75389a66e2d6569a" target=3D"_blank" style=3D"text-decoration: underline;c=
olor: #6367f0;font-weight: 500;">multi-level research with reasoning</a>=E2=
=80=9D,</span>=C2=A0and its corresponding code snippets in the <a class=3D"=
inline-link" href=3D"https://email-v3.openrouter.ai/e/c/eyJlbWFpbF9pZCI6ImR=
nU0VfUW9MQUl2WjlnS0syZllDQVoweE1DbjhpMlhPYllFYnNZVllUUT09IiwiaHJlZiI6Imh0dH=
BzOi8vb3BlbnJvdXRlci5haS9kb2NzL2d1aWRlcy9mZWF0dXJlcy90b29sLWNhbGxpbmc_dXRtX=
2NhbXBhaWduPVdlbGNvbWUrRW1haWwrQ2FtcGFpZ24rJTIzMlx1MDAyNnV0bV9jb250ZW50PVRv=
b2xDYWxsaW5nLWVtYWlsXHUwMDI2dXRtX21lZGl1bT1lbWFpbF9hY3Rpb25cdTAwMjZ1dG1fc29=
1cmNlPWN1c3RvbWVyLmlvIiwiaW50ZXJuYWwiOiI4NGZkMGFjYzAxY2E5NDAxOGJkOWY2MDIiLC=
JsaW5rX2lkIjo3Njl9/6bc02fe3995c05264f89c4a0cf0a8f8881777c75578ab1a83a1fc792=
7ca47b56" style=3D"text-decoration: underline;color: #6367f0;font-weight: 5=
00;">documentation</a>.</p>
 =20
 =20
  <p style=3D"margin: 16px 0;">Happy tool calling!</p>
 =20
 =20
  <p style=3D"color: rgb(0, 0, 0); margin: 16px 0;" class=3D"ca49raw">Best,=
<br/>OpenRouter Team<br/>For questions or comments, reach out to us on <a s=
tyle=3D"color: #6367f0;
font-weight: 500;
text-decoration: underline" class=3D"inline-link" href=3D"https://email-v3.=
openrouter.ai/e/c/eyJlbWFpbF9pZCI6ImRnU0VfUW9MQUl2WjlnS0syZllDQVoweE1DbjhpM=
lhPYllFYnNZVllUUT09IiwiaHJlZiI6Imh0dHBzOi8veC5jb20vb3BlbnJvdXRlcmFpP3V0bV9j=
YW1wYWlnbj1XZWxjb21lK0VtYWlsK0NhbXBhaWduKyUyMzJcdTAwMjZ1dG1fY29udGVudD1Ub29=
sQ2FsbGluZy1lbWFpbFx1MDAyNnV0bV9tZWRpdW09ZW1haWxfYWN0aW9uXHUwMDI2dXRtX3NvdX=
JjZT1jdXN0b21lci5pbyIsImludGVybmFsIjoiODRmZDBhY2MwMWNhOTQwMThiZDlmNjAyIiwib=
Glua19pZCI6Mjh9/5d8abf663c468cccf9771db33b33f7d37b2a0be7b9cd047d7eed33307ff=
42a33">X</a>=C2=A0or on <a style=3D"color: #6367f0;
font-weight: 500;
text-decoration: underline" href=3D"https://discord.com/invite/8TpuzNXQYr?u=
tm_campaign=3DWelcome+Email+Campaign+%232&amp;utm_content=3DToolCalling-ema=
il&amp;utm_medium=3Demail_action&amp;utm_source=3Dcustomer.io" class=3D"unt=
racked inline-link" target=3D"_blank">Discord</a>.<br/></p>
 =20
 =20
  <p style=3D"font-size: 14px; text-align: center; margin: 16px 0;"><a styl=
e=3D"color: #6367f0;
font-weight: 500;
text-decoration: underline" class=3D"inline-link" href=3D"https://email-v3.=
openrouter.ai/manage_subscription_preferences/dgSE_QoLAIvZ9gKK2fYCAZ0xMCn8i=
2XObYEbsYVYTQ=3D=3D">Unsubscribe here.</a></p>
 =20
   =20
          </div>
          <!--[if !true]><! --></div>
      </div>
        <!-- <![endif]--><!--[if true]></td>
      <td></td></tr>
  </table>
  <![endif]-->
  </div>
 =20

       =20
      </div>
   =20
  =E2=80=8B=E2=80=8B<img src=3D"https://email-v3.openrouter.ai/e/o/eyJlbWFp=
bF9pZCI6ImRnU0VfUW9MQUl2WjlnS0syZllDQVoweE1DbjhpMlhPYllFYnNZVllUUT09In0=3D"=
 style=3D"height: 1px !important; max-height: 1px !important; max-width: 1p=
x !important; width: 1px !important; display: none !important;" alt=3D""/><=
/body></html>
--d60a7af03e942c6dc46fe42d86f2a31932d4e3afae6ab8330abb1e7aa181--