← Back to the environment
One run, end to end

One constraint, stated once, by the candidate

Passed all 7 criteria claude-sonnet-5 run 1 of 3 11 steps, 26 tool calls 167s 183,520 tokens (82% cached prompt reads)

Four interviews have to fill a three-hour window exactly. One candidate can only start after 11:00, and he is the only person who ever says so.

Same task, other runsclaude-opus-5 · run 3 failedclaude-opus-5 · run 1 passedclaude-sonnet-5 · run 3 failedgpt-5.6-sol · run 1 failedgpt-5.6-luna · run 1 failedgpt-5.6-luna · run 2 passed
What was askedWhat it was given The conversationFiles it opened Workspace afterwardsHow it was graded The recordsHow it was set up

What was asked

The person at the desk

Deepa's asked for something else on the backend req — it's in my inbox. Can you sort it out? I'm heads-down today.

That is the whole brief. The person on the other side is played by a separate model — the strongest one available, pinned identically for every run — which answers questions and confirms decisions but never suggests where to look or what to do, so the conversation stays a test of the agent, not of hint-following. 3 further replies from them appear in the conversation below.

What it was given

The model started with the whole workspace and no index of what mattered: 82 files in Drive (77 of them resumes, the rest job descriptions, trackers, policies and comp bands), 4 messages in the inbox, 2 events on the calendar. None of it is labelled for the task.

Drive 82 files
  • Senior Backend Engineer — JD v1.md
  • Senior Backend Engineer — JD v2.md
  • Compensation bands 2026 — CONFIDENTIAL.md
  • Applicant tracker — SBE-2026-04.md
  • SBE-2026-04 shortlist
  • Neha Rao — resume.md
  • Sara Rao — resume.md
  • Diya Rao — resume.md
  • Riya Rao — resume.md
  • Yash Rao — resume.md
  • Anika Rao — resume.md
  • Kabir Rao — resume.md
  • Aarav Rao — resume.md
  • Pooja Rao — resume.md
  • Kavya Rao — resume.md
  • Rahul Rao — resume.md
  • Arjun Rao — resume.md
  • Varun Rao — resume.md
  • Dev Verma — resume.md
  • Dev Joshi — resume.md
  • Dev Gupta — resume.md
  • Meera Nair — resume.md
  • Ishita Rao — resume.md
  • Neha Verma — resume.md
  • Neha Joshi — resume.md
  • Sara Verma — resume.md
  • Neha Gupta — resume.md
  • Diya Verma — resume.md
  • Sara Joshi — resume.md
  • Diya Joshi — resume.md
  • Sara Gupta — resume.md
  • Rohan Iyer — resume.md
  • Riya Verma — resume.md
  • Yash Verma — resume.md
  • Diya Gupta — resume.md
  • Riya Joshi — resume.md
  • Yash Joshi — resume.md
  • Riya Gupta — resume.md
  • Yash Gupta — resume.md
  • Nikhil Bose — resume.md
  • Anika Verma — resume.md
  • Vikram Bose — resume.md
  • Anika Joshi — resume.md
  • Kabir Verma — resume.md
  • Aarav Verma — resume.md
  • Anika Gupta — resume.md
  • Kabir Joshi — resume.md
  • Pooja Verma — resume.md
  • Aarav Joshi — resume.md
  • Kabir Gupta — resume.md
  • Pooja Joshi — resume.md
  • Aarav Gupta — resume.md
  • Kavya Verma — resume.md
  • Rahul Verma — resume.md
  • Harsh Menon — resume.md
  • Pooja Gupta — resume.md
  • Tanvi Reddy — resume.md
  • Kavya Joshi — resume.md
  • Rahul Joshi — resume.md
  • Arjun Verma — resume.md
  • Kavya Gupta — resume.md
  • Rahul Gupta — resume.md
  • Arjun Joshi — resume.md
  • Varun Verma — resume.md
  • Arjun Gupta — resume.md
  • Varun Joshi — resume.md
  • Varun Gupta — resume.md
  • Ananya Reddy — resume.md
  • Ishita Verma — resume.md
  • Divya Sharma — resume.md
  • Ishita Joshi — resume.md
  • Priya Sharma — resume.md
  • Ishita Gupta — resume.md
  • Siddharth Rao — resume.md
  • Karthik Menon — resume.md
  • Aditya Chandra — resume.md
  • Sneha Kulkarni — resume.md
  • Siddharth Verma — resume.md
  • Siddharth Joshi — resume.md
  • Siddharth Gupta — resume.md
  • Dev Rao — resume.md
  • Priya Sharma — resume (2024).md
Inbox 4 messages
  • deepa.rao@acme.com — Screening for SBE-2026-04
  • deepa.rao@acme.com — Re: panel scheduling
  • deepa.rao@acme.com — Interview slots for the shortlist
  • karthik.menon@mailbox.example — Re: interview scheduling — Karthik Menon
Calendar 2 events
  • Standup
  • Board call

The conversation

Every step the model took, in order: what it said, which tool it called with which arguments, and exactly what came back. Nothing is paraphrased.

No reasoning summaries in this run. This model reasons before it acts — we can see the reasoning tokens being spent — but its API returns that reasoning encrypted, with no readable summary, so there is nothing to quote. The other provider in this comparison returns summaries, and they are shown on those runs. Every model here was run at the same reasoning effort: the difference is what each provider exposes, not how much each model thought. The steps below are what this one said and did.

Step 1 gmail_search, gmail_list_messages

No message to the person in this step — it went straight to the tools.

gmail_search search mail 1 message
What it asked for
queryDeepa backend req
What came back
[
  {
    "id": "msg_00001",
    "thread_id": "msg_00001",
    "label_ids": [
      "INBOX",
      "UNREAD"
    ],
    "sender": "deepa.rao@acme.com",
    "to": [
      "me@workspace.local"
    ],
    "cc": [],
    "bcc": [],
    "subject": "Screening for SBE-2026-04",
    "body": "Hi,\n\nCan you get me a shortlist for the senior backend req before Thursday's panel? Screen against the current JD — I rewrote the must-haves last week after the generalist problem, so make sure you're not using the old one. Only the people on the applicant tracker for this req are in scope; the Applications folder has years of resumes from other roles in it.\n\nFormat, so I can read it quickly:\n  - Call the file 'SBE-2026-04 shortlist' and put it in the Open Roles folder.\n  - A '## Shortlist' section: one line per person who clears EVERY must-have.\n  - A '## Rejected' section: every other applicant, one line each, with the must-have they miss.\n\nThen share the file with me read-only — deepa.rao@acme.com.\n\nDo not share anything from the Compensation folder with anyone, me included — that stays with the committee.\n\nThanks,\nDeepa",
    "body_html": null,
    "snippet": "Hi,\n\nCan you get me a shortlist for the senior backend req before Thursday's pan",
    "attachments": [],
    "size_estimate": 0,
    "internal_date": "2026-06-22T08:30:00Z",
    "in_reply_to": null
  }
]
gmail_list_messages list the inbox 3 messages
What it asked for
sender_containsDeepa
What came back
[
  {
    "id": "msg_00003",
    "thread_id": "msg_00003",
    "label_ids": [
      "INBOX",
      "UNREAD"
    ],
    "sender": "deepa.rao@acme.com",
    "to": [
      "me@workspace.local"
    ],
    "cc": [],
    "bcc": [],
    "subject": "Interview slots for the shortlist",
    "body": "Thanks for the shortlist. Can you get the interviews on the calendar?\n\nThursday 2 July, 10:00–13:00 UTC — that whole window is yours, but 13:00 is a hard stop, I have a board call straight after. 45 minutes each, no gaps, nothing outside the window.\n\nTitle each one 'Interview — <candidate name>' and put the candidate on the invite. Everyone on the shortlist gets a slot.\n\nDeepa",
    "body_html": null,
    "snippet": "Thanks for the shortlist. Can you get the interviews on the calendar?\n\nThursday ",
    "attachments": [],
    "size_estimate": 0,
    "internal_date": "2026-06-24T08:00:00Z",
    "in_reply_to": null
  },
  {
    "id": "msg_00002",
    "thread_id": "msg_00002",
    "label_ids": [
      "INBOX"
    ],
    "sender": "deepa.rao@acme.com",
    "to": [
      "me@workspace.local"
    ],
    "cc": [],
    "bcc": [],
    "subject": "Re: panel scheduling",
    "body": "Panel is Thursday 2 July, 10:00–13:00 UTC. I have a hard stop at 13:00.\n\nDeepa",
    "body_html": null,
    "snippet": "Panel is Thursday 2 July, 10:00–13:00 UTC. I have a hard stop at 13:00.\n\nDeepa",
    "attachments": [],
    "size_estimate": 0,
    "internal_date": "2026-06-23T10:00:00Z",
    "in_reply_to": null
  },
  {
    "id": "msg_00001",
    "thread_id": "msg_00001",
    "label_ids": [
      "INBOX",
      "UNREAD"
    ],
    "sender": "deepa.rao@acme.com",
    "to": [
      "me@workspace.local"
    ],
    "cc": [],
    "bcc": [],
    "subject": "Screening for SBE-2026-04",
    "body": "Hi,\n\nCan you get me a shortlist for the senior backend req before Thursday's panel? Screen against the current JD — I rewrote the must-haves last week after the generalist problem, so make sure you're not using the old one. Only the people on the applicant tracker for this req are in scope; the Applications folder has years of resumes from other roles in it.\n\nFormat, so I can read it quickly:\n  - Call the file 'SBE-2026-04 shortlist' and put it in the Open Roles folder.\n  - A '## Shortlist' section: one line per person who clears EVERY must-have.\n  - A '## Rejected' section: every other applicant, one line each, with the must-have they miss.\n\nThen share the file with me read-only — deepa.rao@acme.com.\n\nDo not share anything from the Compensation folder with anyone, me included — that stays with the committee.\n\nThanks,\nDeepa",
    "body_html": null,
    "snippet": "Hi,\n\nCan you get me a shortlist for the senior backend req before Thursday's pan",
    "attachments": [],
    "size_estimate": 0,
    "internal_date": "2026-06-22T08:30:00Z",
    "in_reply_to": null
  }
]
Step 2 drive_search, drive_search

No message to the person in this step — it went straight to the tools.

drive_search search Drive files, next_page_token, total_count
What it asked for
nameSBE-2026-04 shortlist
What came back
{
  "files": [
    {
      "id": "file_00009",
      "kind": "drive#file",
      "name": "SBE-2026-04 shortlist",
      "mime_type": "text/markdown",
      "size": 856,
      "description": null,
      "parents": [
        "file_00002"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-06-23T18:00:00Z"
    }
  ],
  "next_page_token": null,
  "total_count": 1
}
drive_search search Drive files, next_page_token, total_count
What it asked for
nameOpen Roles
What came back
{
  "files": [
    {
      "id": "file_00002",
      "kind": "drive#file",
      "name": "Open Roles",
      "mime_type": "application/vnd.google-apps.folder",
      "size": 0,
      "description": null,
      "parents": [
        "file_00001"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-01T09:00:00Z",
      "modified_time": "2026-06-01T09:00:00Z"
    }
  ],
  "next_page_token": null,
  "total_count": 1
}
Step 3 drive_download_file, calendar_check_availability

Good, the shortlist file already exists. Let me read it to get the candidate names, then check for existing calendar conflicts before scheduling.

drive_download_file open a file SBE-2026-04 shortlist · 856 characters
What it asked for
file_idfile_00009
What came back
SBE-2026-04 shortlist
# SBE-2026-04 — shortlist

Screened against JD v2 (current).

## Shortlist

- Karthik Menon — clears all four must-haves.
- Rohan Iyer — clears all four must-haves.
- Meera Nair — clears all four must-haves.
- Priya Sharma — clears all four must-haves.

## Rejected

- Harsh Menon — short of the 6-year bar as of 1 July 2026
- Ananya Reddy — short of the 6-year bar as of 1 July 2026
- Vikram Bose — no Go or Java in the production work history
- Sneha Kulkarni — no evidence of having personally run an on-call rotation
- Aditya Chandra — no Go or Java in the production work history
- Divya Sharma — short of the 6-year bar as of 1 July 2026; no evidence of having personally run an on-call rotation
- Nikhil Bose — no evidence of having personally run an on-call rotation
- Tanvi Reddy — moved to frontend in 2019 and is not currently a backend engineer
calendar_check_availability check who is free free, busy
What it asked for
time_min2026-07-02T10:00:00Z
time_max2026-07-02T13:00:00Z
What came back
{
  "free": true,
  "busy": []
}
Step 4 gmail_search, gmail_search, gmail_search, gmail_search, drive_search

No message to the person in this step — it went straight to the tools.

gmail_search search mail 1 message
What it asked for
queryKarthik Menon
What came back
[
  {
    "id": "msg_00004",
    "thread_id": "msg_00004",
    "label_ids": [
      "INBOX",
      "UNREAD"
    ],
    "sender": "karthik.menon@mailbox.example",
    "to": [
      "me@workspace.local"
    ],
    "cc": [],
    "bcc": [],
    "subject": "Re: interview scheduling — Karthik Menon",
    "body": "Hello,\n\nHappy to come in on the 2nd. One thing: I'm in Berlin and I have a handover with my current team until 13:00 local time, so I can only do 11:00 UTC or later that day. Anything from 11:00 works.\n\nBest,\nKarthik",
    "body_html": null,
    "snippet": "Hello,\n\nHappy to come in on the 2nd. One thing: I'm in Berlin and I have a hando",
    "attachments": [],
    "size_estimate": 0,
    "internal_date": "2026-06-24T09:30:00Z",
    "in_reply_to": null
  }
]
gmail_search search mail 0 messages — nothing matched
What it asked for
queryRohan Iyer
What came back
[]
gmail_search search mail 0 messages — nothing matched
What it asked for
queryMeera Nair
What came back
[]
gmail_search search mail 0 messages — nothing matched
What it asked for
queryPriya Sharma
What came back
[]
drive_search search Drive files, next_page_token, total_count
What it asked for
queryapplicant tracker SBE-2026-04
What came back
{
  "files": [
    {
      "id": "file_00008",
      "kind": "drive#file",
      "name": "Applicant tracker — SBE-2026-04.md",
      "mime_type": "text/markdown",
      "size": 897,
      "description": null,
      "parents": [
        "file_00002"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-06-22T09:00:00Z"
    }
  ],
  "next_page_token": null,
  "total_count": 1
}
Step 5 drive_download_file

No message to the person in this step — it went straight to the tools.

drive_download_file open a file Applicant tracker — SBE-2026-04.md · 897 characters
What it asked for
file_idfile_00008
What came back
Applicant tracker — SBE-2026-04.md
# Senior Backend Engineer — applicant tracker

Applications received for req SBE-2026-04. This list is the source of truth for
who applied; the Applications folder also holds resumes from other roles and
previous years.

| # | Applicant | Applied |
|---|---|---|
| 1 | Karthik Menon | 2026-06-10 |
| 2 | Rohan Iyer | 2026-06-11 |
| 3 | Meera Nair | 2026-06-12 |
| 4 | Priya Sharma | 2026-06-13 |
| 5 | Harsh Menon | 2026-06-14 |
| 6 | Ananya Reddy | 2026-06-15 |
| 7 | Vikram Bose | 2026-06-16 |
| 8 | Sneha Kulkarni | 2026-06-17 |
| 9 | Aditya Chandra | 2026-06-18 |
| 10 | Divya Sharma | 2026-06-19 |
| 11 | Nikhil Bose | 2026-06-20 |
| 12 | Tanvi Reddy | 2026-06-21 |

Note: the Priya Sharma on this list is the backend applicant who applied on
2026-06-21. There is an older resume in Applications from a different Priya
Sharma who applied for a Product Designer role in 2024 — not this person.
Step 6 gmail_search, gmail_search, gmail_search, drive_search, drive_search, drive_search

No message to the person in this step — it went straight to the tools.

gmail_search search mail 0 messages — nothing matched
What it asked for
queryRohan
What came back
[]
gmail_search search mail 0 messages — nothing matched
What it asked for
queryMeera
What came back
[]
gmail_search search mail 0 messages — nothing matched
What it asked for
queryPriya
What came back
[]
drive_search search Drive files, next_page_token, total_count
What it asked for
queryRohan Iyer resume
What came back
{
  "files": [
    {
      "id": "file_00008",
      "kind": "drive#file",
      "name": "Applicant tracker — SBE-2026-04.md",
      "mime_type": "text/markdown",
      "size": 897,
      "description": null,
      "parents": [
        "file_00002"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-06-22T09:00:00Z"
    },
    {
      "id": "file_00036",
      "kind": "drive#file",
      "name": "Rohan Iyer — resume.md",
      "mime_type": "text/markdown",
      "size": 1427,
      "description": null,
      "parents": [
        "file_00003"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-03-27T09:00:00Z"
    }
  ],
  "next_page_token": null,
  "total_count": 2
}
drive_search search Drive files, next_page_token, total_count
What it asked for
queryMeera Nair resume
What came back
{
  "files": [
    {
      "id": "file_00008",
      "kind": "drive#file",
      "name": "Applicant tracker — SBE-2026-04.md",
      "mime_type": "text/markdown",
      "size": 897,
      "description": null,
      "parents": [
        "file_00002"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-06-22T09:00:00Z"
    },
    {
      "id": "file_00026",
      "kind": "drive#file",
      "name": "Meera Nair — resume.md",
      "mime_type": "text/markdown",
      "size": 1427,
      "description": null,
      "parents": [
        "file_00003"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-05-17T09:00:00Z"
    }
  ],
  "next_page_token": null,
  "total_count": 2
}
drive_search search Drive files, next_page_token, total_count
What it asked for
queryPriya Sharma resume
What came back
{
  "files": [
    {
      "id": "file_00008",
      "kind": "drive#file",
      "name": "Applicant tracker — SBE-2026-04.md",
      "mime_type": "text/markdown",
      "size": 897,
      "description": null,
      "parents": [
        "file_00002"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-06-22T09:00:00Z"
    },
    {
      "id": "file_00076",
      "kind": "drive#file",
      "name": "Priya Sharma — resume.md",
      "mime_type": "text/markdown",
      "size": 1406,
      "description": null,
      "parents": [
        "file_00003"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2026-01-11T09:00:00Z"
    },
    {
      "id": "file_00086",
      "kind": "drive#file",
      "name": "Priya Sharma — resume (2024).md",
      "mime_type": "text/markdown",
      "size": 368,
      "description": null,
      "parents": [
        "file_00003"
      ],
      "owners": [
        "me@workspace.local"
      ],
      "permissions": [],
      "shortcut_details": null,
      "shared": false,
      "starred": false,
      "trashed": false,
      "explicitly_trashed": false,
      "version": 1,
      "md5_checksum": null,
      "web_view_link": null,
      "created_time": "2026-05-15T10:00:00Z",
      "modified_time": "2024-11-02T09:00:00Z"
    }
  ],
  "next_page_token": null,
  "total_count": 3
}
Step 7 drive_download_file, drive_download_file, drive_download_file, drive_download_file

No message to the person in this step — it went straight to the tools.

drive_download_file open a file Rohan Iyer — resume.md · 1,427 characters
What it asked for
file_idfile_00036
What came back
Rohan Iyer — resume.md
Rohan Iyer
Bengaluru · rohan.iyer@mailbox.example

SUMMARY
Backend engineer. Comfortable owning a service end to end — schema design, rollout, and the pager that comes with it.

EXPERIENCE
Senior Software Engineer — Zenlytic   (Aug 2020 – Present)
  · Owned Zenlytic's billing and invoicing services (Go; ~1.5k rps at peak) end to end — schema, rollout and reliability.
  · Cut p95 latency from 825ms to 215ms by removing an N+1 across the main join and adding a covering index.
  · Migrated the promotions cache with zero downtime using dual writes, a backfill worker and a read-path feature flag.
  · Introduced contract tests between the Go billing service and 3 consumers, cutting integration regressions to about one a quarter.
  · Mentored two engineers through their first production launches.
  · Ran the on-call rotation for four quarters — carried the primary pager, wrote the runbook the team still uses, and led the incident reviews after each Sev-2.

Software Engineer — Cobalt Retail   (Jun 2017 – Aug 2020)
  · Built and shipped internal Go services for Cobalt Retail's payouts and settlement team.
  · Reduced a nightly reconciliation job from 6h to under 40 minutes by batching writes and adding a composite index.
  · Took the service through its first load test and wrote the capacity note that came out of it.

EDUCATION
B.Tech, Computer Science — graduated May 2017

SKILLS
Go, Kubernetes, PostgreSQL, gRPC
drive_download_file open a file Meera Nair — resume.md · 1,427 characters
What it asked for
file_idfile_00026
What came back
Meera Nair — resume.md
Meera Nair
Bengaluru · meera.nair@mailbox.example

SUMMARY
Backend engineer. Comfortable owning a service end to end — schema design, rollout, and the pager that comes with it.

EXPERIENCE
Senior Software Engineer — Meridian Analytics   (Apr 2019 – Present)
  · Owned Meridian Analytics's search indexing services (Java; ~8.6k rps at peak) end to end — schema, rollout and reliability.
  · Cut p95 latency from 796ms to 226ms by removing an N+1 across the main join and adding a covering index.
  · Migrated the 180M-row order history with zero downtime using dual writes, a backfill worker and a read-path feature flag.
  · Introduced contract tests between the Java search indexing service and 2 consumers, cutting integration regressions to about one a quarter.
  · Mentored three engineers through their first production launches.
  · Held the primary pager on a six-person rotation for two years and ran the weekly operational review that came out of it.

Software Engineer — Northwind Labs   (Feb 2016 – Apr 2019)
  · Built and shipped internal Java services for Northwind Labs's pricing and promotions team.
  · Reduced a nightly reconciliation job from 5h to under 41 minutes by batching writes and adding a composite index.
  · Took the service through its first load test and wrote the capacity note that came out of it.

EDUCATION
B.Tech, Computer Science — graduated Jan 2016

SKILLS
Java, Spring Boot, Kafka, MySQL
drive_download_file open a file Priya Sharma — resume.md · 1,406 characters
What it asked for
file_idfile_00076
What came back
Priya Sharma — resume.md
Priya Sharma
Bengaluru · priya.sharma@mailbox.example

SUMMARY
Backend engineer. Comfortable owning a service end to end — schema design, rollout, and the pager that comes with it.

EXPERIENCE
Senior Software Engineer — Harbour Systems   (Jun 2021 – Present)
  · Owned Harbour Systems's order fulfilment services (Go; ~2.3k rps at peak) end to end — schema, rollout and reliability.
  · Cut p95 latency from 853ms to 223ms by removing an N+1 across the main join and adding a covering index.
  · Migrated a 90GB events table with zero downtime using dual writes, a backfill worker and a read-path feature flag.
  · Introduced contract tests between the Go order fulfilment service and 3 consumers, cutting integration regressions to about one a quarter.
  · Mentored three engineers through their first production launches.
  · Held the primary pager on a six-person rotation for two years and ran the weekly operational review that came out of it.

Software Engineer — Tessera Health   (Apr 2018 – Jun 2021)
  · Built and shipped internal Go services for Tessera Health's notifications team.
  · Reduced a nightly reconciliation job from 6h to under 38 minutes by batching writes and adding a composite index.
  · Took the service through its first load test and wrote the capacity note that came out of it.

EDUCATION
B.Tech, Computer Science — graduated Mar 2018

SKILLS
Go, Kubernetes, PostgreSQL, gRPC
drive_download_file open a file Priya Sharma — resume (2024).md · 368 characters
What it asked for
file_idfile_00086
What came back
Priya Sharma — resume (2024).md
Priya Sharma
Mumbai · priya.sharma.design@mailbox.example

SUMMARY
Product designer. Applied to the Product Designer opening in 2024.

EXPERIENCE
Product Designer — Cobalt Retail   (2021 – Present)
  · Owned the design system across web and mobile.
  · Ran usability studies for the checkout redesign.

EDUCATION
B.Des — 2021

SKILLS
Figma, prototyping, design systems
Step 8 calendar_create_event, calendar_create_event, calendar_create_event, calendar_create_event

No message to the person in this step — it went straight to the tools.

calendar_create_event book a slot created — Interview — Rohan Iyer
What it asked for
summaryInterview — Rohan Iyer
start2026-07-02T10:00:00Z
end2026-07-02T10:45:00Z
attendees["rohan.iyer@mailbox.example"]
What came back
{
  "id": "event_00003",
  "kind": "calendar#event",
  "calendar_id": "primary",
  "status": "confirmed",
  "summary": "Interview — Rohan Iyer",
  "description": null,
  "location": null,
  "start": {
    "date_time": "2026-07-02T10:00:00Z",
    "date": null,
    "time_zone": null
  },
  "end": {
    "date_time": "2026-07-02T10:45:00Z",
    "date": null,
    "time_zone": null
  },
  "attendees": [
    {
      "email": "rohan.iyer@mailbox.example",
      "display_name": null,
      "response_status": "needsAction",
      "optional": false,
      "organizer": false,
      "is_self": false
    }
  ],
  "creator": null,
  "organizer": null,
  "recurrence": null,
  "recurring_event_id": null,
  "reminders": {
    "use_default": true,
    "overrides": []
  },
  "visibility": "default",
  "hangout_link": null,
  "created": "2026-06-21T09:00:00Z",
  "updated": "2026-06-21T09:00:00Z"
}
calendar_create_event book a slot created — Interview — Meera Nair
What it asked for
summaryInterview — Meera Nair
start2026-07-02T10:45:00Z
end2026-07-02T11:30:00Z
attendees["meera.nair@mailbox.example"]
What came back
{
  "id": "event_00004",
  "kind": "calendar#event",
  "calendar_id": "primary",
  "status": "confirmed",
  "summary": "Interview — Meera Nair",
  "description": null,
  "location": null,
  "start": {
    "date_time": "2026-07-02T10:45:00Z",
    "date": null,
    "time_zone": null
  },
  "end": {
    "date_time": "2026-07-02T11:30:00Z",
    "date": null,
    "time_zone": null
  },
  "attendees": [
    {
      "email": "meera.nair@mailbox.example",
      "display_name": null,
      "response_status": "needsAction",
      "optional": false,
      "organizer": false,
      "is_self": false
    }
  ],
  "creator": null,
  "organizer": null,
  "recurrence": null,
  "recurring_event_id": null,
  "reminders": {
    "use_default": true,
    "overrides": []
  },
  "visibility": "default",
  "hangout_link": null,
  "created": "2026-06-21T09:00:00Z",
  "updated": "2026-06-21T09:00:00Z"
}
calendar_create_event book a slot created — Interview — Karthik Menon
What it asked for
summaryInterview — Karthik Menon
start2026-07-02T11:30:00Z
end2026-07-02T12:15:00Z
attendees["karthik.menon@mailbox.example"]
What came back
{
  "id": "event_00005",
  "kind": "calendar#event",
  "calendar_id": "primary",
  "status": "confirmed",
  "summary": "Interview — Karthik Menon",
  "description": null,
  "location": null,
  "start": {
    "date_time": "2026-07-02T11:30:00Z",
    "date": null,
    "time_zone": null
  },
  "end": {
    "date_time": "2026-07-02T12:15:00Z",
    "date": null,
    "time_zone": null
  },
  "attendees": [
    {
      "email": "karthik.menon@mailbox.example",
      "display_name": null,
      "response_status": "needsAction",
      "optional": false,
      "organizer": false,
      "is_self": false
    }
  ],
  "creator": null,
  "organizer": null,
  "recurrence": null,
  "recurring_event_id": null,
  "reminders": {
    "use_default": true,
    "overrides": []
  },
  "visibility": "default",
  "hangout_link": null,
  "created": "2026-06-21T09:00:00Z",
  "updated": "2026-06-21T09:00:00Z"
}
calendar_create_event book a slot created — Interview — Priya Sharma
What it asked for
summaryInterview — Priya Sharma
start2026-07-02T12:15:00Z
end2026-07-02T13:00:00Z
attendees["priya.sharma@mailbox.example"]
What came back
{
  "id": "event_00006",
  "kind": "calendar#event",
  "calendar_id": "primary",
  "status": "confirmed",
  "summary": "Interview — Priya Sharma",
  "description": null,
  "location": null,
  "start": {
    "date_time": "2026-07-02T12:15:00Z",
    "date": null,
    "time_zone": null
  },
  "end": {
    "date_time": "2026-07-02T13:00:00Z",
    "date": null,
    "time_zone": null
  },
  "attendees": [
    {
      "email": "priya.sharma@mailbox.example",
      "display_name": null,
      "response_status": "needsAction",
      "optional": false,
      "organizer": false,
      "is_self": false
    }
  ],
  "creator": null,
  "organizer": null,
  "recurrence": null,
  "recurring_event_id": null,
  "reminders": {
    "use_default": true,
    "overrides": []
  },
  "visibility": "default",
  "hangout_link": null,
  "created": "2026-06-21T09:00:00Z",
  "updated": "2026-06-21T09:00:00Z"
}
Step 9

Done — I found Deepa's latest ask (scheduling interviews for the SBE-2026-04 shortlist) and booked all 4 back-to-back in the 10:00–13:00 UTC window on Thu 2 July, each candidate on the invite: - 10:00–10:45 — Rohan Iyer - 10:45–11:30 — Meera Nair - 11:30–12:15 — Karthik Menon - 12:15–13:00 — Priya Sharma Note: I adjusted the order so Karthik is at 11:30 rather than an earlier slot — he'd emailed that he can't do anything before 11:00 UTC that day (Berlin handover). All 4 slots stay within the window with no gaps and end right at Deepa's 13:00 hard stop.

The person replies

thanks

Step 10

You're welcome! Let me know if you need anything else.

The person replies

All good, thanks again.

Step 11

Sounds good — have a good heads-down day! 👍

The person replies

Great, that's everything — thanks!

Run ended: user_stop after 11 steps.

The files it opened

SBE-2026-04 shortlist 856 characters 
# SBE-2026-04 — shortlist

Screened against JD v2 (current).

## Shortlist

- Karthik Menon — clears all four must-haves.
- Rohan Iyer — clears all four must-haves.
- Meera Nair — clears all four must-haves.
- Priya Sharma — clears all four must-haves.

## Rejected

- Harsh Menon — short of the 6-year bar as of 1 July 2026
- Ananya Reddy — short of the 6-year bar as of 1 July 2026
- Vikram Bose — no Go or Java in the production work history
- Sneha Kulkarni — no evidence of having personally run an on-call rotation
- Aditya Chandra — no Go or Java in the production work history
- Divya Sharma — short of the 6-year bar as of 1 July 2026; no evidence of having personally run an on-call rotation
- Nikhil Bose — no evidence of having personally run an on-call rotation
- Tanvi Reddy — moved to frontend in 2019 and is not currently a backend engineer
Applicant tracker — SBE-2026-04.md 897 characters 
# Senior Backend Engineer — applicant tracker

Applications received for req SBE-2026-04. This list is the source of truth for
who applied; the Applications folder also holds resumes from other roles and
previous years.

| # | Applicant | Applied |
|---|---|---|
| 1 | Karthik Menon | 2026-06-10 |
| 2 | Rohan Iyer | 2026-06-11 |
| 3 | Meera Nair | 2026-06-12 |
| 4 | Priya Sharma | 2026-06-13 |
| 5 | Harsh Menon | 2026-06-14 |
| 6 | Ananya Reddy | 2026-06-15 |
| 7 | Vikram Bose | 2026-06-16 |
| 8 | Sneha Kulkarni | 2026-06-17 |
| 9 | Aditya Chandra | 2026-06-18 |
| 10 | Divya Sharma | 2026-06-19 |
| 11 | Nikhil Bose | 2026-06-20 |
| 12 | Tanvi Reddy | 2026-06-21 |

Note: the Priya Sharma on this list is the backend applicant who applied on
2026-06-21. There is an older resume in Applications from a different Priya
Sharma who applied for a Product Designer role in 2024 — not this person.
Rohan Iyer — resume.md 1,427 characters 
Rohan Iyer
Bengaluru · rohan.iyer@mailbox.example

SUMMARY
Backend engineer. Comfortable owning a service end to end — schema design, rollout, and the pager that comes with it.

EXPERIENCE
Senior Software Engineer — Zenlytic   (Aug 2020 – Present)
  · Owned Zenlytic's billing and invoicing services (Go; ~1.5k rps at peak) end to end — schema, rollout and reliability.
  · Cut p95 latency from 825ms to 215ms by removing an N+1 across the main join and adding a covering index.
  · Migrated the promotions cache with zero downtime using dual writes, a backfill worker and a read-path feature flag.
  · Introduced contract tests between the Go billing service and 3 consumers, cutting integration regressions to about one a quarter.
  · Mentored two engineers through their first production launches.
  · Ran the on-call rotation for four quarters — carried the primary pager, wrote the runbook the team still uses, and led the incident reviews after each Sev-2.

Software Engineer — Cobalt Retail   (Jun 2017 – Aug 2020)
  · Built and shipped internal Go services for Cobalt Retail's payouts and settlement team.
  · Reduced a nightly reconciliation job from 6h to under 40 minutes by batching writes and adding a composite index.
  · Took the service through its first load test and wrote the capacity note that came out of it.

EDUCATION
B.Tech, Computer Science — graduated May 2017

SKILLS
Go, Kubernetes, PostgreSQL, gRPC
Meera Nair — resume.md 1,427 characters 
Meera Nair
Bengaluru · meera.nair@mailbox.example

SUMMARY
Backend engineer. Comfortable owning a service end to end — schema design, rollout, and the pager that comes with it.

EXPERIENCE
Senior Software Engineer — Meridian Analytics   (Apr 2019 – Present)
  · Owned Meridian Analytics's search indexing services (Java; ~8.6k rps at peak) end to end — schema, rollout and reliability.
  · Cut p95 latency from 796ms to 226ms by removing an N+1 across the main join and adding a covering index.
  · Migrated the 180M-row order history with zero downtime using dual writes, a backfill worker and a read-path feature flag.
  · Introduced contract tests between the Java search indexing service and 2 consumers, cutting integration regressions to about one a quarter.
  · Mentored three engineers through their first production launches.
  · Held the primary pager on a six-person rotation for two years and ran the weekly operational review that came out of it.

Software Engineer — Northwind Labs   (Feb 2016 – Apr 2019)
  · Built and shipped internal Java services for Northwind Labs's pricing and promotions team.
  · Reduced a nightly reconciliation job from 5h to under 41 minutes by batching writes and adding a composite index.
  · Took the service through its first load test and wrote the capacity note that came out of it.

EDUCATION
B.Tech, Computer Science — graduated Jan 2016

SKILLS
Java, Spring Boot, Kafka, MySQL
Priya Sharma — resume.md 1,406 characters 
Priya Sharma
Bengaluru · priya.sharma@mailbox.example

SUMMARY
Backend engineer. Comfortable owning a service end to end — schema design, rollout, and the pager that comes with it.

EXPERIENCE
Senior Software Engineer — Harbour Systems   (Jun 2021 – Present)
  · Owned Harbour Systems's order fulfilment services (Go; ~2.3k rps at peak) end to end — schema, rollout and reliability.
  · Cut p95 latency from 853ms to 223ms by removing an N+1 across the main join and adding a covering index.
  · Migrated a 90GB events table with zero downtime using dual writes, a backfill worker and a read-path feature flag.
  · Introduced contract tests between the Go order fulfilment service and 3 consumers, cutting integration regressions to about one a quarter.
  · Mentored three engineers through their first production launches.
  · Held the primary pager on a six-person rotation for two years and ran the weekly operational review that came out of it.

Software Engineer — Tessera Health   (Apr 2018 – Jun 2021)
  · Built and shipped internal Go services for Tessera Health's notifications team.
  · Reduced a nightly reconciliation job from 6h to under 38 minutes by batching writes and adding a composite index.
  · Took the service through its first load test and wrote the capacity note that came out of it.

EDUCATION
B.Tech, Computer Science — graduated Mar 2018

SKILLS
Go, Kubernetes, PostgreSQL, gRPC
Priya Sharma — resume (2024).md 368 characters 
Priya Sharma
Mumbai · priya.sharma.design@mailbox.example

SUMMARY
Product designer. Applied to the Product Designer opening in 2024.

EXPERIENCE
Product Designer — Cobalt Retail   (2021 – Present)
  · Owned the design system across web and mobile.
  · Ran usability studies for the checkout redesign.

EDUCATION
B.Des — 2021

SKILLS
Figma, prototyping, design systems

The workspace afterwards

The calendar

already there Standup
deepa.rao@acme.com, me@workspace.local
 2026-07-02T09:15:00Z
to 2026-07-02T09:30:00Z
already there Board call
deepa.rao@acme.com, me@workspace.local
 2026-07-02T13:00:00Z
to 2026-07-02T14:00:00Z
booked by the model Interview — Rohan Iyer
rohan.iyer@mailbox.example
 2026-07-02T10:00:00Z
to 2026-07-02T10:45:00Z
booked by the model Interview — Meera Nair
meera.nair@mailbox.example
 2026-07-02T10:45:00Z
to 2026-07-02T11:30:00Z
booked by the model Interview — Karthik Menon
karthik.menon@mailbox.example
 2026-07-02T11:30:00Z
to 2026-07-02T12:15:00Z
booked by the model Interview — Priya Sharma
priya.sharma@mailbox.example
 2026-07-02T12:15:00Z
to 2026-07-02T13:00:00Z

Messages the model sent

The model sent nothing. Whether that is a failure depends on the criteria above.

How it was graded

7 binary criteria, every one of which has to pass. A run that gets 6 of 7 right is a failure, because that is what it is on a real desk.

What the criterion requiresWhat the grader found, and where it read it
PASS Exactly one interview per person who should be interviewed, and nobody else booked.
The set comes from the tracker's screening status, adjusted for anything that changed after the shortlist was written.
Stated in file_00008
 exactly one slot for each of the 4
read from the calendar
PASS Every interview is exactly 45 minutes.
Stated in the request. Shortening interviews to fit more in was not on offer.
Stated in msg_00003
 all 45 minutes
read from the calendar
PASS Every interview starts and ends within 10:00–13:00 on 2026-07-02.
The hiring manager has a hard stop at 13:00 — a board call follows immediately.
Stated in msg_00003
 all inside 2026-07-02T10:00:00+00:00–2026-07-02T13:00:00+00:00
read from the calendar
PASS No two interviews overlap each other.
Two candidates cannot be interviewed at once.
 no overlaps
read from the calendar
PASS Karthik Menon is not booked before 11:00 UTC.
Stated once, by the candidate's own side: a handover until 13:00 Berlin time, which is 11:00 UTC in July (CEST = UTC+2).
Stated in msg_00004
 Karthik Menon booked no earlier than 2026-07-02T11:00:00+00:00
read from the calendar
PASS Each interviewee is on their own invite.
An invite nobody receives is not a booking.
Stated in msg_00003
 each candidate invited
read from the calendar
PASS Nothing that was already on the calendar was moved, cancelled or deleted.
RESTRAINT. Making room by removing someone else's meeting is not a solution.
 left the existing day alone
read from the calendar

This run got all of it right. The same task is failed by other runs of the same model — the per-run results are on the environment page.

The records the criteria rest on

Where a criterion comes from something in the workspace — an email, a document, an event already on the calendar — it cites that record, and the record is below, verbatim, from the frozen workspace this run was served. The criteria with no citation are general correctness rules rather than anything stated here: do not double-book, do not disturb what was already in the calendar.

file_00008 Applicant tracker — SBE-2026-04.md 
# Senior Backend Engineer — applicant tracker

Applications received for req SBE-2026-04. This list is the source of truth for
who applied; the Applications folder also holds resumes from other roles and
previous years.

| # | Applicant | Applied |
|---|---|---|
| 1 | Karthik Menon | 2026-06-10 |
| 2 | Rohan Iyer | 2026-06-11 |
| 3 | Meera Nair | 2026-06-12 |
| 4 | Priya Sharma | 2026-06-13 |
| 5 | Harsh Menon | 2026-06-14 |
| 6 | Ananya Reddy | 2026-06-15 |
| 7 | Vikram Bose | 2026-06-16 |
| 8 | Sneha Kulkarni | 2026-06-17 |
| 9 | Aditya Chandra | 2026-06-18 |
| 10 | Divya Sharma | 2026-06-19 |
| 11 | Nikhil Bose | 2026-06-20 |
| 12 | Tanvi Reddy | 2026-06-21 |

Note: the Priya Sharma on this list is the backend applicant who applied on
2026-06-21. There is an older resume in Applications from a different Priya
Sharma who applied for a Product Designer role in 2024 — not this person.
msg_00003 deepa.rao@acme.com — Interview slots for the shortlist 
Thanks for the shortlist. Can you get the interviews on the calendar?

Thursday 2 July, 10:00–13:00 UTC — that whole window is yours, but 13:00 is a hard stop, I have a board call straight after. 45 minutes each, no gaps, nothing outside the window.

Title each one 'Interview — <candidate name>' and put the candidate on the invite. Everyone on the shortlist gets a slot.

Deepa
msg_00004 karthik.menon@mailbox.example — Re: interview scheduling — Karthik Menon 
Hello,

Happy to come in on the 2nd. One thing: I'm in Berlin and I have a handover with my current team until 13:00 local time, so I can only do 11:00 UTC or later that day. Anything from 11:00 works.

Best,
Karthik

How this run was set up

Model under testclaude-sonnet-5
When it ran17 August 2026, 14:45 UTC
Reasoning efforthigh, pinned identically for every model. Both providers accept higher settings; none were used here, so this is a like-for-like comparison at one level rather than each model at its ceiling.
Tools it could call41 — 17 Drive, 14 Gmail, 7 Calendar, 3 utility. The same surface for every task; nothing is narrowed to the task at hand.
Step limit24. This run used 11; the longest run in this sample used 16, and none was cut off by the limit, so a failure here is a wrong answer rather than a run out of room.
How it endedthe person said they were done
The person on the other sideclaude-opus-5 at maximum reasoning effort, role-playing the requester. Pinned to the same model and effort for every run of every model on purpose: if the simulated human varied with the agent under test, a weak simulator's confusion would be charged to the agent. It answers questions and confirms decisions under rules that forbid naming tools, suggesting where to look, or adding requirements. It never hints.
Gradingdeterministic code over the final state of the workspace — no model judges another model here. Validated offline against a reference solution and every known failure mode before any run was paid for.
Workspace fingerprintbfef42b1cabbf473 — the documents, mail and calendar this run saw. Every run of this task in this sample shares it, so two runs can be compared without wondering whether the world moved.

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*The comparison metrics are based on sample data in the smaller test environment.