Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/surajpanwar/advanced-calc-engine/engineergit clone --depth 1 https://github.com/surajpanwar/advanced-calc-engineWhat 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 | $0.00007 | $0.00176 |
| Opus 5 | $0.00003 | $0.00088 |
| Sonnet 5 | $0.00001 | $0.00035 |
| Haiku 4.5 | $0.00001 | $0.00018 |
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 yesterday.
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.
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.
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.
- yesterday First seen · 47 lines · 7 tokens per session scan A 012514c1496d
engineer is an agent published in the GitHub repository surajpanwar/advanced-calc-engine (0 stars, last pushed 17d ago), licensed MIT. It adds 7 tokens to every session and 176 once invoked, about $0.0000 per session on Opus 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.
Other agents, from other repositories
code-reviewer
Idun coding-guideline review against the active rule set.
huyen-agents
Updated 2025: This is a summary of Chip Huyen's blog and book chapter on agents, with some added context to provide a comprehensive overview of their design, capabilities, and practical applications.
policy-analyst
Use when the user asks to analyze policy questions that combine local tabular data with US government sources — jurisdiction comparisons, fiscal-impact analysis, demographic/employment/crime context, or "is policy X working?" questions referencing Census, BLS, FBI Crime Data, or Wikidata. Prefer data-analyst for plain…
data-wrangler
Use when the user asks to clean, transform, reshape, dedupe, join, concatenate, sort, replace, or convert tabular data and produce new output files — e.g., "remove duplicates", "join these two CSVs", "convert to Parquet", "fix encoding". Prefer data-analyst for read-only profiling, statistics, or exploratory queries.
security-reviewer
Use this agent to audit qsv code changes for security issues — unsafe-code misuse, input-validation gaps, command injection, resource exhaustion, and information disclosure. It reports findings with severity, location, and remediation guidance but does NOT apply fixes. Trigger before merging changes to network-facing…
cr-custom-rules
Reviews a supplied diff against explicit repository rules from supplied rule sources. Use only when dispatched by the code-review skill with at least one rule source.