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/microsoft/bc-bench/altestgit clone --depth 1 https://github.com/microsoft/BC-BenchWhat 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 | $0.00009 | $0.02279 |
| Opus 5 | $0.00005 | $0.01140 |
| Sonnet 5 | $0.00002 | $0.00456 |
| Haiku 4.5 | $0.00001 | $0.00228 |
Grade A, and why
ALTest 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 268 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CRITICAL: PRESERVE ALL EXISTING CODE
- NEVER remove, delete, or simplify existing test code - it was generated by another agent and verified by a human developer.
- NEVER add new setup code, business logic, or "improvements" beyond what's in the rules below.
- Your job is ONLY to fix formatting, structure, and coding standard violations - NOT to change test logic.
- If code seems unnecessary or wrong, LEAVE IT - the human developer approved it.
CRITICAL: BUILD MUST SUCCEED
- Your output must compile in the target test project.
- Avoid introducing new objects (new codeunits/files) unless absolutely required (see Build Robustness rules).
<structure_rules>
Test Structure
Required format:
[Test]
procedure DescriptiveProcedureName()
begin
// [FEATURE] [AI test]
// [SCENARIO 123456] Brief one-line description
Initialize();
// [GIVEN] Setup preconditions
LibrarySales.CreateCustomer(Customer);
LibrarySales.CreateSalesInvoice(SalesInvoice, Customer);
// [GIVEN] More setup preconditions
LibraryPurchase.CreateVendor(Vendor);
LibraryPurchase.CreatePurchaseInvoice(PurchaseInvoice, Vendor);
// [WHEN] Execute the action
Customer.Validate(Name, 'Test');
// [THEN] Verify expected outcome
Assert.AreEqual('Test', Customer.Name, 'Name should be updated');
end;
Rules:
// [FEATURE] [AI test]must be first line afterbegin// [SCENARIO <WorkItemID>]on next line - work item ID is REQUIRED:// [SCENARIO 123456] DescriptionInitialize();immediately after [SCENARIO]- Each [GIVEN]/[WHEN]/[THEN] comments must be preceded by an empty line
- Interleave [GIVEN]/[WHEN]/[THEN] comments with code
- In COMMENTS, refer to entities with 1-2 letters: "C", "V", "C1" (e.g.,
// [GIVEN] Customer "C" with Sales Invoice "SI") - Variable names must be FULL names, not abbreviated:
CustomerNo,VendorNo,ItemNo(NOTC,V,CustNo,VendNo) - Use rounded amounts without decimals </structure_rules>
<build_robustness_rules>
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.
- 2d ago First seen · 268 lines · 9 tokens per session scan A e8733db6df0c
ALTest is an agent published in the GitHub repository microsoft/BC-Bench (56 stars, last pushed 4d ago), licensed MIT. It adds 9 tokens to every session and 2,279 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 2026-08-30.
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