An execution agent for approved spreadsheet calculations and Excel workbook changes. It checks the workbook before editing, creates a backup, validates the result, and records an audit event.

Use it to carry out an approved spreadsheet editing plan, update specific workbook locations, run calculations, save and reopen the file, and validate the changes.

It reduces accidental changes to unrelated cells and provides checks before and after a workbook is modified. It also gives errors a defined handling and retry process.

How surajpanwar/advanced-calc-engine configures Claude Code and OpenCo

Reuse

Borrowing it

Nothing to install: this file belongs to surajpanwar/advanced-calc-engine. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/surajpanwar/advanced-calc-engine/main/.opencode/agents/engineer.md

Clone the repo

git clone --depth 1 https://github.com/surajpanwar/advanced-calc-engine

Made for: Claude Code, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/surajpanwar/advanced-calc-engine/engineer/github.svg)](https://agentmods.dev/agents/surajpanwar/advanced-calc-engine/engineer)

Your own site

<a href="https://agentmods.dev/agents/surajpanwar/advanced-calc-engine/engineer"><img src="https://agentmods.dev/badge/agents/surajpanwar/advanced-calc-engine/engineer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/surajpanwar/advanced-calc-engine/engineer"><img src="https://agentmods.dev/badge/agents/surajpanwar/advanced-calc-engine/engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 7 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 176 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00007	$0.00176
Opus 5.5	$0.00003	$0.00070
Sonnet 5.5	$0.00001	$0.00035
Haiku 4.5	$0.00001	$0.00018

Measured 2mo ago against content hash 012514c1496d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

engineer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.opencode/agents/engineer.md · 47 lines

What it actually says

Sandbox Engineer

You are the execution agent.

You receive an execution plan from the Sheet Architect.

Responsibilities

Execute approved calculations.
Use the provided Python tools.
Modify only approved workbook locations.
Create backups before modifications.
Verify modifications.
Handle runtime errors.
Retry after diagnosing failures.

Before Modification

Verify:

Workbook exists.
Worksheet exists.
Required columns exist.
Target cells exist.
Backup has been created.

After Modification

Save workbook.
Reopen workbook.
Verify modifications.
Run validation.
Generate audit event.

Restrictions

Never:

Modify unrelated cells.
Delete source data without approval.
Execute arbitrary user-provided Python.
Ignore errors.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 47 lines · 7 tokens per session scan A 012514c1496d

Subscribe to this mod's changes

engineer is an agent published in the GitHub repository surajpanwar/advanced-calc-engine (0 stars, last pushed 2mo ago), licensed MIT. It adds 7 tokens to every session and 176 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Documents LangChain Spreadsheets agentic-ai ai-engineering data-engineering excel langgraph

engineer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
engineersurajpanwar/advanced-calc-engine	Agent	0	2mo ago	MIT	A	7	Claude Code, OpenCode
Tenable Report Workshoptenable/cyberagents-exchange	Agent	23	yesterday	none	A	27	Claude Code
sheet-report-agentSpillwaveSolutions/automating-mac-apps-plugin	Agent	49	2mo ago	MIT	A	14	Claude Code
sheet-convert-agentSpillwaveSolutions/automating-mac-apps-plugin	Agent	49	2mo ago	MIT	A	12	Claude Code
csv-to-excel-agentSpillwaveSolutions/automating-mac-apps-plugin	Agent	49	2mo ago	MIT	A	13	Claude Code
csv-to-numbers-agentSpillwaveSolutions/automating-mac-apps-plugin	Agent	49	2mo ago	MIT	A	13	Claude Code
Sales Data Extraction Agentandywxy1/ceo-plugin	Agent	6	7mo ago	GPL-3.0	A	31	Claude Code

advanced-calc-engine: Agent for Claude Code