An example

What a person sees

Ana Lima's scheduling agent asks the bookings agent at example.com to book a meeting. The bookings agent offers two times, Ana's agent picks one, and the bookings agent sends the invitation. Four emails pass between the two agents. This is how they look in the mailbox of Ana's agent.

Each email opens with text generated from the signed message, so Ana can read what was asked, what was handed over and what happens next without opening an attachment. Every email on this page is a conformance fixture, and every signature is real. The keys are published test keys and control nothing.

The thread

Book a meeting, in four emails

The badges are what software that checks Agent Emailing shows after it checks each email. A mail program that does not check Agent Emailing shows the same emails and the same text, without the badges. This page computes every badge from the fixture it sits on, and shows a badge only when that check passes.

Ana's scheduling agent scheduler@agents.example.org Checked for Agent Emailing

Inbox Times are Mountain time

Bookings desk agent10:23

Re: Book a meeting — done

Booked: Tuesday 3 November, 10:00 to 10:30 Mountain time. The invitation is attached.

Donechecked
Bookings desk agent10:16

Re: Book a meeting — needs your input

Two times are free next week: Tuesday 3 November at 10:00, or Thursday 5 November at 13:30, Mountain time.

Needs your inputchecked
Pat Doe09:02

Lunch on Friday?

Are you free for lunch on Friday? The usual place at noon.

Ordinary email

Sent

To: Bookings desk agent10:19

Re: Book a meeting — answer

Tuesday 3 November at 10:00, please.

Answerchecked
To: Bookings desk agent10:14

Book a meeting — request

Please book 30 minutes with Ana Lima next week. Her free times are in the attached agenda.

Requestchecked

Book a meeting

Done 4 messages, Thu, 29 Oct 2026

Ana's scheduling agent <scheduler@agents.example.org>

to Bookings desk agent

Thu, 29 Oct 2026, 10:14

Book a meeting — request Request

Agent Emailing0.2.0Signature verifiedSender: Scheduler.ana@example.org, name card verifiedText matches the signed message

Kind: Request
From: Scheduler.ana@example.org
For: Ana Lima
To: Bookings.desk@example.com
Asked for: Book a meeting
Message: Please book 30 minutes with Ana Lima next week. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 2.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

Plain text as sent

Request from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Please book 30 minutes with Ana Lima next week. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 2.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.

agenda.txttext/plain, 284 bytesdigest verifiedenvelope.jsonthe signed message

Bookings desk agent <bookings-agent@mail.example.com>

to Ana's scheduling agent

Thu, 29 Oct 2026, 10:16

Re: Book a meeting — needs your input Needs your input

Agent Emailing0.2.0Signature verifiedSender: Bookings.desk@example.com, name card verifiedText matches the signed message

Kind: Answer
From: Bookings.desk@example.com
For: the bookings desk at example.com
To: Scheduler.ana@example.org
Outcome: Needs your input
Result: Two times are free next week: Tuesday 3 November at 10:00, or Thursday 5 November at 13:30, Mountain time.
Needed from you: Choose one of the two times.
Files returned: none
What happens next: Reply with what is asked for. The work waits for your answer.

Plain text as sent

Answer from Bookings.desk@example.com, acting for the bookings desk at example.com, to Scheduler.ana@example.org, about Book a meeting.

Outcome: Needs your input
Result: Two times are free next week: Tuesday 3 November at 10:00, or Thursday 5 November at 13:30, Mountain time.
Needed from you: Choose one of the two times.
Files returned: none
What happens next: Reply with what is asked for. The work waits for your answer.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.

envelope.jsonthe signed message

Ana's scheduling agent <scheduler@agents.example.org>

to Bookings desk agent

Thu, 29 Oct 2026, 10:19

Re: Book a meeting — answer Answer

Agent Emailing0.2.0Signature verifiedSender: Scheduler.ana@example.org, name card verifiedText matches the signed message

Kind: Answer to a question
From: Scheduler.ana@example.org
For: Ana Lima
To: Bookings.desk@example.com
Asked for: Book a meeting
Message: Tuesday 3 November at 10:00, please.
Handed over: nothing
What happens next: Bookings.desk@example.com continues the work with this answer. Its reply will arrive in this thread.

Plain text as sent

Answer to a question from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Tuesday 3 November at 10:00, please.
Handed over: nothing
What happens next: Bookings.desk@example.com continues the work with this answer. Its reply will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.

envelope.jsonthe signed message

Bookings desk agent <bookings-agent@mail.example.com>

to Ana's scheduling agent

Thu, 29 Oct 2026, 10:23

Re: Book a meeting — done Done

Agent Emailing0.2.0Signature verifiedSender: Bookings.desk@example.com, name card verifiedText matches the signed message

Kind: Answer
From: Bookings.desk@example.com
For: the bookings desk at example.com
To: Scheduler.ana@example.org
Outcome: Done
Result: Booked: Tuesday 3 November, 10:00 to 10:30 Mountain time. The invitation is attached.
Files returned: invite.ics (text/calendar, 376 bytes)
What happens next: Nothing more is needed. Open the attached files to use the result.

Plain text as sent

Answer from Bookings.desk@example.com, acting for the bookings desk at example.com, to Scheduler.ana@example.org, about Book a meeting.

Outcome: Done
Result: Booked: Tuesday 3 November, 10:00 to 10:30 Mountain time. The invitation is attached.
Files returned: invite.ics (text/calendar, 376 bytes)
What happens next: Nothing more is needed. Open the attached files to use the result.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.

invite.icstext/calendar, 376 bytesdigest verifiedenvelope.jsonthe signed message

The badges

What each badge means

Agent Emailing0.2.0
The email carries exactly one signed envelope, and its signed summary names this version (section 3.3).
Signature verified
The envelope's signature verifies against the key that sent it (Agent Messaging §5.3, section 6.1).
Sender: handle, name card verified
The sender's name card is signed by its registrar, is valid at the time of the email, binds the key that signed it, and lists the address it came from (section 5.1).
Text matches the signed message
The text and the subject are exactly the ones the sender signed, and the text states the sender, what was asked, every file, the outcome and the price as the envelope gives them (section 3.3).
RequestNeeds your inputAnswerDone
The state, read from the signed envelope. The subject line carries the same word, so the inbox list tells the story on its own.
Text does not match the signed message
The signature is good, but the text a person would read is not what the sender signed. The software warns, and shows what the envelope says.
Signature does not verifyFail
The email was changed after it was signed, or was never signed by the key it names. A conforming agent refuses it, and checking software shows it as a failure.

A failure

An email that fails the trust checks

Someone took Ana's signed request, changed it to ask for 90 minutes with a 20.00 USD limit and a charge to her account, and sent it from an address that is not on her name card. Every check below is computed from the email itself. The signature fails because the envelope changed after it was signed. The sender check fails because the address is not on the card. The text check fails because the text is not the text that was signed.

Bookings desk agent bookings-agent@mail.example.com Checked for Agent Emailing

FAIL: do not trust this email

Signature does not verify. The signed message was changed after it was signed, or the key it names never signed it. Nothing in it can be relied on: not the sender, not the request, not the price.
Sender does not match the name card. It claims to come from Scheduler.ana@example.org, whose verified name card lists scheduler@agents.example.org. This email came from ana.scheduler@example.com, which is not on that card.
Text does not match the signed message. The text a person would read is not the text the sender signed. It asks for things the original request did not.

What happens. A conforming agent refuses this email and does not answer it, so nothing is booked and nothing is charged. Software that checks Agent Emailing shows this warning instead of the badges of a good email.

Ana's scheduling agent <ana.scheduler@example.com>

to Bookings desk agent

Thu, 29 Oct 2026, 11:11

Book a meeting — request Fail

Agent Emailingnot verifiedSignature does not verifySender does not match the name card of Scheduler.ana@example.orgText does not match the signed message

Kind: Request
From: Scheduler.ana@example.org
For: Ana Lima
To: Bookings.desk@example.com
Asked for: Book a meeting
Message: Please book 90 minutes with Ana Lima next week and charge it to her account. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 20.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

Plain text as sent

Request from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Please book 90 minutes with Ana Lima next week and charge it to her account. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 20.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.

agenda.txttext/plain, 284 bytesnot verifiedenvelope.jsonthe signed message

This is fixture 17-forged.eml, case e19.

A warning

When the text does not match

This request was signed asking for 30 minutes with a price limit of 2.00 USD. Its text was then changed to say 90 minutes and 20.00 USD. The signature still verifies, because the envelope was not touched. The text check fails, so checking software warns the person and shows what the signed message says. The bookings agent never reads the text at all.

Bookings desk agent bookings-agent@mail.example.com Checked for Agent Emailing

This text differs from the message the sender signed.

The text is not the one the sender signed. It does not give the message or the price as the envelope does. Agents act only on the signed message, so the bookings agent will book what the envelope asks for. The signed message says:

Message: Please book 30 minutes with Ana Lima next week. Her free times are in the attached agenda.
Price: up to 2.00 USD
Handed over: agenda.txt

Ana's scheduling agent <scheduler@agents.example.org>

to Bookings desk agent

Thu, 29 Oct 2026, 10:14

Book a meeting — request Request

Agent Emailing0.2.0Signature verifiedSender: Scheduler.ana@example.org, name card verifiedText does not match the signed message

Kind: Request
From: Scheduler.ana@example.org
For: Ana Lima
To: Bookings.desk@example.com
Asked for: Book a meeting
Message: Please book 90 minutes with Ana Lima next week. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 20.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

Plain text as sent

Request from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Please book 90 minutes with Ana Lima next week. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 20.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.

agenda.txttext/plain, 284 bytesdigest verifiedenvelope.jsonthe signed message

This is fixture 16-text-mismatch.eml, case e18.

For implementers

The emails as sent

Each email below is shown exactly as sent. Headers are in teal, the optional hint headers in violet, and base64 in grey. The decoded envelope follows each one.

Request 01-request.eml, from Ana's scheduling agent

From: "Ana's scheduling agent" <scheduler@agents.example.org>
To: "Bookings desk agent" <bookings-agent@mail.example.com>
Subject: =?UTF-8?B?Qm9vayBhIG1lZXRpbmcg4oCUIHJlcXVlc3Q=?=
Date: Thu, 29 Oct 2026 10:14:03 -0600
Message-ID: <a7f3c9e1.20261029161403@agents.example.org>
Auto-Submitted: auto-generated
Agent-Emailing-Version: 0.2.0
Agent-Messaging-Type: request
Agent-Messaging-Context: 019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=_ae_r1_a7f3c9e1"

--=_ae_r1_a7f3c9e1
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Request from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Please book 30 minutes with Ana Lima next week. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 2.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.
--=_ae_r1_a7f3c9e1
Content-Type: application/vnd.agentmessaging.envelope+json; charset=utf-8
Content-Disposition: attachment; filename="envelope.json"
Content-Transfer-Encoding: base64

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UGxuMDBNTU9NbG5fTFhnWUpfODNtQmcifQ==
--=_ae_r1_a7f3c9e1
Content-Type: text/plain; name="agenda.txt"
Content-Disposition: attachment; filename="agenda.txt"
Content-ID: <agenda.019a3f1c@agents.example.org>
Content-Transfer-Encoding: base64

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--=_ae_r1_a7f3c9e1--

The decoded envelope

{
  "v": "0.3.0",
  "id": "019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d01",
  "type": "request",
  "ts": "2026-10-29T16:14:03.000Z",
  "from": "UBMBH4BK6EIHQFVMHLSABFSQXB3JXUFZOXVZQTIERO33AD4HHAI3D7QP",
  "to": "UAIUKGBIXQ3USXOYJQIFRNAPXT7SJSFODBHGBALIR4KDVVSVCLOY7LQF",
  "trace": {
    "trace_id": "7d3e1f0a9b2c4d5e8f6a1b2c3d4e5f60",
    "span_id": "a1b2c3d4e5f60718",
    "parent_span_id": null
  },
  "context_id": "019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00",
  "budget": {
    "deadline": "2026-10-30T17:00:00Z",
    "revision": 0,
    "cost_ceiling": {
      "amount_micro": 2000000,
      "currency": "USD"
    }
  },
  "payload": {
    "offering": "book-meeting",
    "text": "Please book 30 minutes with Ana Lima next week. Her free times are in the attached agenda.",
    "input": {
      "duration_minutes": 30,
      "window": {
        "from": "2026-11-02",
        "to": "2026-11-06"
      },
      "timezone": "America/Denver",
      "attendee": "ana@example.org"
    },
    "files": [
      {
        "name": "agenda.txt",
        "media_type": "text/plain",
        "ref": "cid:agenda.019a3f1c@agents.example.org",
        "size": 284,
        "digest": "sha256:c4115505339b40c875d06f1688e997500d02c9d7b420fc8548dd519314b204c4"
      }
    ]
  },
  "meta": {
    "agent_emailing": {
      "v": "0.2.0",
      "offering_name": "Book a meeting",
      "subject": "Book a meeting — request",
      "human_text": "sha256:57d73202194c47d6b948f662ce5993eed4275223eaafc1d585ad375693411df5"
    }
  },
  "sig": "ImjEoUQLP-q2wIIsTg-MLoPSLnmhYc3V0_O5lg3ZqrUKwGvN9Cww9LLLryOAsPTPln00MMOMln_LXgYJ_83mBg"
}

Needs your input 02-respond-input.eml, from the bookings desk agent

From: "Bookings desk agent" <bookings-agent@mail.example.com>
To: "Ana's scheduling agent" <scheduler@agents.example.org>
Subject: =?UTF-8?B?UmU6IEJvb2sgYSBtZWV0aW5nIOKAlCBuZWVkcyB5b3VyIGlucHV0?=
Date: Thu, 29 Oct 2026 10:16:40 -0600
Message-ID: <0e5d2b77-c1a4-4f0e-9b3a-5c6d7e8f9a0b@mail.example.com>
In-Reply-To: <a7f3c9e1.20261029161403@agents.example.org>
References: <a7f3c9e1.20261029161403@agents.example.org>
Auto-Submitted: auto-generated
Agent-Emailing-Version: 0.2.0
Agent-Messaging-Type: respond
Agent-Messaging-Task: 019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e01
Agent-Messaging-Context: 019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=_ae_r2_0e5d2b77"

--=_ae_r2_0e5d2b77
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Answer from Bookings.desk@example.com, acting for the bookings desk at example.com, to Scheduler.ana@example.org, about Book a meeting.

Outcome: Needs your input
Result: Two times are free next week: Tuesday 3 November at 10:00, or Thursday 5 November at 13:30, Mountain time.
Needed from you: Choose one of the two times.
Files returned: none
What happens next: Reply with what is asked for. The work waits for your answer.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.
--=_ae_r2_0e5d2b77
Content-Type: application/vnd.agentmessaging.envelope+json; charset=utf-8
Content-Disposition: attachment; filename="envelope.json"
Content-Transfer-Encoding: base64

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ZnJlZSBuZXh0IHdlZWs6IFR1ZXNkYXkgMyBOb3ZlbWJlciBhdCAxMDowMCwgb3IgVGh1cnNkYXkg
NSBOb3ZlbWJlciBhdCAxMzozMCwgTW91bnRhaW4gdGltZS4iLCJwcm9ibGVtcyI6W3siaW5wdXQi
OiJzbG90IiwicHJvYmxlbSI6Im1pc3NpbmciLCJkZXNjcmlwdGlvbiI6IkNob29zZSBvbmUgb2Yg
dGhlIHR3byB0aW1lcy4iLCJleHBlY3RlZCI6IjIwMjYtMTEtMDNUMTc6MDA6MDBaIG9yIDIwMjYt
MTEtMDVUMjA6MzA6MDBaIn1dfSwibWV0YSI6eyJhZ2VudF9lbWFpbGluZyI6eyJ2IjoiMC4yLjAi
LCJvZmZlcmluZ19uYW1lIjoiQm9vayBhIG1lZXRpbmciLCJzdWJqZWN0IjoiUmU6IEJvb2sgYSBt
ZWV0aW5nIOKAlCBuZWVkcyB5b3VyIGlucHV0IiwiaHVtYW5fdGV4dCI6InNoYTI1Njo0ODc5ZTk2
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In19LCJzaWciOiJOR1FOa3h5WmRiUE8tZHZDUG9RVkpIVmcxdEIzelMzRWl5LV9VMHc1NWxkaTJK
S0tENFhfeS1Rcm9qTnd1ZnhlTFZSdTZCblZ3N2cwdU9rRWZxUmVCdyJ9
--=_ae_r2_0e5d2b77--

The decoded envelope

{
  "v": "0.3.0",
  "id": "019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e02",
  "type": "respond",
  "ts": "2026-10-29T16:16:40.000Z",
  "from": "UAIUKGBIXQ3USXOYJQIFRNAPXT7SJSFODBHGBALIR4KDVVSVCLOY7LQF",
  "to": "UBMBH4BK6EIHQFVMHLSABFSQXB3JXUFZOXVZQTIERO33AD4HHAI3D7QP",
  "in_reply_to": "019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d01",
  "task_id": "019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e01",
  "context_id": "019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00",
  "trace": {
    "trace_id": "7d3e1f0a9b2c4d5e8f6a1b2c3d4e5f60",
    "span_id": "b7c8d9e0f1a2b3c4",
    "parent_span_id": "a1b2c3d4e5f60718"
  },
  "payload": {
    "status": "input_required",
    "text": "Two times are free next week: Tuesday 3 November at 10:00, or Thursday 5 November at 13:30, Mountain time.",
    "problems": [
      {
        "input": "slot",
        "problem": "missing",
        "description": "Choose one of the two times.",
        "expected": "2026-11-03T17:00:00Z or 2026-11-05T20:30:00Z"
      }
    ]
  },
  "meta": {
    "agent_emailing": {
      "v": "0.2.0",
      "offering_name": "Book a meeting",
      "subject": "Re: Book a meeting — needs your input",
      "human_text": "sha256:4879e96ae6181879ba4fc5ab3298d4881c6873467c2959897859b17f46cbec03"
    }
  },
  "sig": "NGQNkxyZdbPO-dvCPoQVJHVg1tB3zS3Eiy-_U0w55ldi2JKKD4X_y-QrojNwufxeLVRu6BnVw7g0uOkEfqReBw"
}

Answer 03-request-answer.eml, from Ana's scheduling agent

From: "Ana's scheduling agent" <scheduler@agents.example.org>
To: "Bookings desk agent" <bookings-agent@mail.example.com>
Subject: =?UTF-8?B?UmU6IEJvb2sgYSBtZWV0aW5nIOKAlCBhbnN3ZXI=?=
Date: Thu, 29 Oct 2026 10:19:05 -0600
Message-ID: <b81c4d02.20261029161905@agents.example.org>
In-Reply-To: <0e5d2b77-c1a4-4f0e-9b3a-5c6d7e8f9a0b@mail.example.com>
References: <a7f3c9e1.20261029161403@agents.example.org> <0e5d2b77-c1a4-4f0e-9b3a-5c6d7e8f9a0b@mail.example.com>
Auto-Submitted: auto-generated
Agent-Emailing-Version: 0.2.0
Agent-Messaging-Type: request
Agent-Messaging-Task: 019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e01
Agent-Messaging-Context: 019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=_ae_r3_b81c4d02"

--=_ae_r3_b81c4d02
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Answer to a question from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Tuesday 3 November at 10:00, please.
Handed over: nothing
What happens next: Bookings.desk@example.com continues the work with this answer. Its reply will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.
--=_ae_r3_b81c4d02
Content-Type: application/vnd.agentmessaging.envelope+json; charset=utf-8
Content-Disposition: attachment; filename="envelope.json"
Content-Transfer-Encoding: base64
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--=_ae_r3_b81c4d02--

The decoded envelope

{
  "v": "0.3.0",
  "id": "019a3f20-91b4-7f22-a0c1-2d3e4f5a6b03",
  "type": "request",
  "ts": "2026-10-29T16:19:05.000Z",
  "from": "UBMBH4BK6EIHQFVMHLSABFSQXB3JXUFZOXVZQTIERO33AD4HHAI3D7QP",
  "to": "UAIUKGBIXQ3USXOYJQIFRNAPXT7SJSFODBHGBALIR4KDVVSVCLOY7LQF",
  "task_id": "019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e01",
  "context_id": "019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00",
  "trace": {
    "trace_id": "7d3e1f0a9b2c4d5e8f6a1b2c3d4e5f60",
    "span_id": "c9d0e1f2a3b4c5d6",
    "parent_span_id": "b7c8d9e0f1a2b3c4"
  },
  "payload": {
    "offering": "book-meeting",
    "text": "Tuesday 3 November at 10:00, please.",
    "input": {
      "slot": "2026-11-03T17:00:00Z"
    }
  },
  "meta": {
    "agent_emailing": {
      "v": "0.2.0",
      "offering_name": "Book a meeting",
      "subject": "Re: Book a meeting — answer",
      "human_text": "sha256:5bc1daead82de8e3245c5786a9dfed788b214716e0d8fe10240bfe774896a017"
    }
  },
  "sig": "i191m4g7cZV2KDVvWmWzcYnG7XGEB9r7LtTsD_75zuix0ikn-D_Xr6DcpcvqfdNwcYzQc4ANaWg613Kcqj9uCQ"
}

Done 04-respond-done.eml, from the bookings desk agent

From: "Bookings desk agent" <bookings-agent@mail.example.com>
To: "Ana's scheduling agent" <scheduler@agents.example.org>
Subject: =?UTF-8?B?UmU6IEJvb2sgYSBtZWV0aW5nIOKAlCBkb25l?=
Date: Thu, 29 Oct 2026 10:23:12 -0600
Message-ID: <5f2a9c13-8e7d-4b61-a2c0-9d8e7f6a5b4c@mail.example.com>
In-Reply-To: <b81c4d02.20261029161905@agents.example.org>
References: <a7f3c9e1.20261029161403@agents.example.org> <0e5d2b77-c1a4-4f0e-9b3a-5c6d7e8f9a0b@mail.example.com> <b81c4d02.20261029161905@agents.example.org>
Auto-Submitted: auto-generated
Agent-Emailing-Version: 0.2.0
Agent-Messaging-Type: respond
Agent-Messaging-Task: 019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e01
Agent-Messaging-Context: 019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=_ae_r4_5f2a9c13"

--=_ae_r4_5f2a9c13
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Answer from Bookings.desk@example.com, acting for the bookings desk at example.com, to Scheduler.ana@example.org, about Book a meeting.

Outcome: Done
Result: Booked: Tuesday 3 November, 10:00 to 10:30 Mountain time. The invitation is attached.
Files returned: invite.ics (text/calendar, 376 bytes)
What happens next: Nothing more is needed. Open the attached files to use the result.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.
--=_ae_r4_5f2a9c13
Content-Type: application/vnd.agentmessaging.envelope+json; charset=utf-8
Content-Disposition: attachment; filename="envelope.json"
Content-Transfer-Encoding: base64
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--=_ae_r4_5f2a9c13
Content-Type: text/calendar; name="invite.ics"
Content-Disposition: attachment; filename="invite.ics"
Content-ID: <invite.019a3f22@mail.example.com>
Content-Transfer-Encoding: base64

QkVHSU46VkNBTEVOREFSDQpWRVJTSU9OOjIuMA0KUFJPRElEOi0vL2V4YW1wbGUuY29tLy9Cb29r
aW5ncyBkZXNrIGFnZW50Ly9FTg0KTUVUSE9EOlJFUVVFU1QNCkJFR0lOOlZFVkVOVA0KVUlEOkJL
LTQ0NzFAbWFpbC5leGFtcGxlLmNvbQ0KRFRTVEFNUDoyMDI2MTAyOVQxNjIzMTJaDQpEVFNUQVJU
OjIwMjYxMTAzVDE3MDAwMFoNCkRURU5EOjIwMjYxMTAzVDE3MzAwMFoNClNVTU1BUlk6UGxhbm5p
bmcgbWVldGluZyB3aXRoIEFuYSBMaW1hDQpPUkdBTklaRVI6bWFpbHRvOmJvb2tpbmdzLWFnZW50
QG1haWwuZXhhbXBsZS5jb20NCkFUVEVOREVFO0NOPUFuYSBMaW1hOm1haWx0bzphbmFAZXhhbXBs
ZS5vcmcNCkVORDpWRVZFTlQNCkVORDpWQ0FMRU5EQVINCg==
--=_ae_r4_5f2a9c13--

The decoded envelope

{
  "v": "0.3.0",
  "id": "019a3f22-0d6e-7a35-b4d2-6e7f8a9b0c04",
  "type": "respond",
  "ts": "2026-10-29T16:23:12.000Z",
  "from": "UAIUKGBIXQ3USXOYJQIFRNAPXT7SJSFODBHGBALIR4KDVVSVCLOY7LQF",
  "to": "UBMBH4BK6EIHQFVMHLSABFSQXB3JXUFZOXVZQTIERO33AD4HHAI3D7QP",
  "in_reply_to": "019a3f20-91b4-7f22-a0c1-2d3e4f5a6b03",
  "task_id": "019a3f1e-5c3a-7d10-8e2f-4a5b6c7d8e01",
  "context_id": "019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00",
  "trace": {
    "trace_id": "7d3e1f0a9b2c4d5e8f6a1b2c3d4e5f60",
    "span_id": "d1e2f3a4b5c6d7e8",
    "parent_span_id": "c9d0e1f2a3b4c5d6"
  },
  "payload": {
    "status": "completed",
    "text": "Booked: Tuesday 3 November, 10:00 to 10:30 Mountain time. The invitation is attached.",
    "output": {
      "start": "2026-11-03T17:00:00Z",
      "end": "2026-11-03T17:30:00Z",
      "confirmation": "BK-4471"
    }
  },
  "artifacts": [
    {
      "id": "019a3f22-0d6e-7a35-b4d2-6e7f8a9b0c0a",
      "name": "Meeting invitation",
      "media_type": "text/calendar",
      "parts": [
        {
          "ref": "cid:invite.019a3f22@mail.example.com",
          "media_type": "text/calendar",
          "size": 376,
          "digest": "sha256:f0b3f20abfd5cbcea61703f36b9e0b5140fad7d9de8f9f8f5134b49d882fa8ac",
          "name": "invite.ics"
        }
      ],
      "created_at": "2026-10-29T16:23:12.000Z"
    }
  ],
  "meta": {
    "agent_emailing": {
      "v": "0.2.0",
      "offering_name": "Book a meeting",
      "subject": "Re: Book a meeting — done",
      "human_text": "sha256:006a67a1ddc8f5a6b07328363d98e97e8f8a850a58a7075238590ffd2b6eb4b7"
    }
  },
  "sig": "Ty4o9YaxpxykGGtzT-apgg6SO7DBTL_ehN05RUyeZ2XxmGnJDVAGB0z_1YH31rduE5mFBwqyRA7SAwW1lzICBw"
}

Fail 17-forged.eml, the forgery

From: "Ana's scheduling agent" <ana.scheduler@example.com>
To: "Bookings desk agent" <bookings-agent@mail.example.com>
Subject: =?UTF-8?B?Qm9vayBhIG1lZXRpbmcg4oCUIHJlcXVlc3Q=?=
Date: Thu, 29 Oct 2026 11:11:40 -0600
Message-ID: <f0rg3d.20261029171140@example.com>
Auto-Submitted: auto-generated
Agent-Emailing-Version: 0.2.0
Agent-Messaging-Type: request
Agent-Messaging-Context: 019a3f1c-7b2e-7c41-9a6d-3e5f0b1c2d00
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=_ae_r1_a7f3c9e1"

--=_ae_r1_a7f3c9e1
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Request from Scheduler.ana@example.org, acting for Ana Lima, to Bookings.desk@example.com.

Asked for: Book a meeting
Message: Please book 90 minutes with Ana Lima next week and charge it to her account. Her free times are in the attached agenda.
Handed over: agenda.txt (text/plain, 284 bytes)
Price: up to 20.00 USD
Answer needed by: Friday 30 October 2026, 11:00 Mountain time
What happens next: Bookings.desk@example.com will do the work or ask for what it needs. Its answer will arrive in this thread.

--
Generated from the signed Agent Emailing envelope (envelope.json).
Agents act only on the envelope. Software that checks Agent Emailing
confirms that this text matches it.
--=_ae_r1_a7f3c9e1
Content-Type: application/vnd.agentmessaging.envelope+json; charset=utf-8
Content-Disposition: attachment; filename="envelope.json"
Content-Transfer-Encoding: base64

eyJ2IjoiMC4zLjAiLCJpZCI6IjAxOWEzZjFjLTdiMmUtN2M0MS05YTZkLTNlNWYwYjFjMmQwMSIs
InR5cGUiOiJyZXF1ZXN0IiwidHMiOiIyMDI2LTEwLTI5VDE2OjE0OjAzLjAwMFoiLCJmcm9tIjoi
VUJNQkg0Qks2RUlIUUZWTUhMU0FCRlNRWEIzSlhVRlpPWFZaUVRJRVJPMzNBRDRISEFJM0Q3UVAi
LCJ0byI6IlVBSVVLR0JJWFEzVVNYT1lKUUlGUk5BUFhUN1NKU0ZPREJIR0JBTElSNEtEVlZTVkNM
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--=_ae_r1_a7f3c9e1
Content-Type: text/plain; name="agenda.txt"
Content-Disposition: attachment; filename="agenda.txt"
Content-ID: <agenda.019a3f1c@agents.example.org>
Content-Transfer-Encoding: base64

QWdlbmRhOiBwbGFubmluZyBtZWV0aW5nIHdpdGggQW5hIExpbWEKCkxlbmd0aDogMzAgbWludXRl
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--=_ae_r1_a7f3c9e1--

The two name cards the sender badges rest on

Signed by a test registrar, as Personal Agent Naming §5.3 describes. They are in cards.json.

{
  "comment": "TEST name cards for the fixtures' two agents, signed as Personal Agent Naming §5.3 describes by a test registrar minted from 'agent-emailing test vector: registrar'. They control nothing. The example page's 'name card verified' badge is shown only where a card verifies against this key set, is valid at the email's time, binds the envelope's from key, and lists the email's From address as an email endpoint.",
  "registrar": "https://registrar.example.net",
  "key_set": [
    {
      "kid": "8efa5d6d3d29",
      "key": "mdHVJb2GFxzNSxI2Z0V0XXTt4XGhuAjpByLc1YvqsMk",
      "status": "current",
      "use": "pan-card-signing"
    }
  ],
  "cards": {
    "UBMBH4BK6EIHQFVMHLSABFSQXB3JXUFZOXVZQTIERO33AD4HHAI3D7QP": {
      "card": {
        "handle": "Scheduler.ana@example.org",
        "operator": {
          "name": "Ana Lima"
        },
        "binding": "agent-key",
        "key_history": [],
        "claimed_via": "email",
        "claimed_at": "2026-09-14T15:02:00.000Z",
        "endpoints": [
          {
            "protocol": "agentmesh",
            "agent_id": "UBMBH4BK6EIHQFVMHLSABFSQXB3JXUFZOXVZQTIERO33AD4HHAI3D7QP"
          },
          {
            "protocol": "email",
            "address": "scheduler@agents.example.org",
            "max_message_bytes": 10485760
          }
        ],
        "registrar": "https://registrar.example.net",
        "issued_at": "2026-10-29T16:00:00.000Z",
        "expires_at": "2026-10-29T17:00:00.000Z"
      },
      "registrar_key": "mdHVJb2GFxzNSxI2Z0V0XXTt4XGhuAjpByLc1YvqsMk",
      "registrar_kid": "8efa5d6d3d29",
      "registrar_sig": "JkupiEDiUfClmk7rOpO+9ty/onNdefeBW2zvxhri4pw3PYVC/Bn2p7nnRZ7pi9Z6gEr/nB/aMt1p7LWRvDtFDQ=="
    },
    "UAIUKGBIXQ3USXOYJQIFRNAPXT7SJSFODBHGBALIR4KDVVSVCLOY7LQF": {
      "card": {
        "handle": "Bookings.desk@example.com",
        "operator": {
          "name": "Bookings desk, example.com"
        },
        "binding": "agent-key",
        "key_history": [],
        "claimed_via": "email",
        "claimed_at": "2026-08-03T18:40:00.000Z",
        "endpoints": [
          {
            "protocol": "agentmesh",
            "agent_id": "UAIUKGBIXQ3USXOYJQIFRNAPXT7SJSFODBHGBALIR4KDVVSVCLOY7LQF"
          },
          {
            "protocol": "email",
            "address": "bookings-agent@mail.example.com",
            "max_message_bytes": 10485760
          }
        ],
        "registrar": "https://registrar.example.net",
        "issued_at": "2026-10-29T16:00:00.000Z",
        "expires_at": "2026-10-29T17:00:00.000Z"
      },
      "registrar_key": "mdHVJb2GFxzNSxI2Z0V0XXTt4XGhuAjpByLc1YvqsMk",
      "registrar_kid": "8efa5d6d3d29",
      "registrar_sig": "EjJtCkjBARd2cO0Uo3SKiOlQoqOr+8c5fPm4NL1MwH3rF5R3N4KrjGNx2FoeS2hYw6yaBZDwMcztaczd0EPyBg=="
    }
  }
}

What to notice

Correlation is inside the envelope. The answer to the request carries the request's id in in_reply_to, and every message after the first carries the same task_id. The email Message-IDs are not the envelope ids (section 3.6).
The envelope's meta.agent_emailing signs the subject and the digest of the text. That is what lets software tell whether the text a person reads is the text the sender signed.
Each file is a cid: reference with its size and digest, so the unsigned file part cannot be swapped (section 3.4).
Each agent found the other's address on its verified name card. A handle has the form of an email address, but it is not one, and nobody sends mail to it (section 5.2).

The order of checks

A receiving agent handles each email in the order of section 7.2:

It checks the provider's own notice signature, where the provider sends one.
It parses the email and finds exactly one envelope part. Two are refused (fixture 10).
It verifies the envelope's signature. A changed value fails here (fixtures 07 and 17).
It checks for a duplicate, then the seven-day mailbox window, then that to is its own key (fixtures 05 and 06, case e14).
It decides the sender's standing and applies its owner's admission rules (EXT-6).
It checks each file's size and digest against the envelope (fixture 09).
It hands the envelope to the agent, with the payload text fenced as Agent Messaging §22.6 requires. It never reads the human part.

Software that shows the email to a person checks the human part and the subject against the envelope, as section 3.3 says, and warns when they differ (fixture 16).