ALTest

ALTest is an agent for Claude Code from microsoft/BC-Bench. It costs 9 tokens per session (2,279 once invoked), scanned A, original, MIT.

A set of instructions for writing tests in AL, the programming language used by Microsoft Business Central. It structures tests around setup, action, and expected result while preserving existing test logic.

In plain words
What is it for?
Use it when creating or formatting AL test procedures. It covers test naming, comments, setup steps, and the structure needed for Business Central test code.
Why use it?
It helps developers add or correct Business Central tests without accidentally deleting approved code or changing what the tests are meant to check. It also keeps the test project buildable.

Agent for Claude Code ✓ vendor

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it when creating or formatting AL test procedures. It covers test naming, comments, setup steps, and the structure needed for Business Central test code.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/microsoft/bc-bench/altest
About the project

BC-Bench is a benchmark for measuring coding agents on real-world Microsoft Business Central development tasks written in AL. It helps compare models and agent configurations using reproducible evaluation data.

microsoft/BC-Bench · 58 stars · on GitHub · microsoft.github.io

Install

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.

Clone the repo
git clone --depth 1 https://github.com/microsoft/BC-Bench

Made for: Claude Code.

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.

agentmods badge for ALTest

README.md
[![agentmods](https://agentmods.dev/badge/agents/microsoft/bc-bench/altest/github.svg)](https://agentmods.dev/agents/microsoft/bc-bench/altest)
Your own site
<a href="https://agentmods.dev/agents/microsoft/bc-bench/altest"><img src="https://agentmods.dev/badge/agents/microsoft/bc-bench/altest/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.

agentmods 80×15 button for ALTest

Your own site · 80×15
<a href="https://agentmods.dev/agents/microsoft/bc-bench/altest"><img src="https://agentmods.dev/badge/agents/microsoft/bc-bench/altest.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 9 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,279 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00009 $0.02279
Opus 5.5 $0.00004 $0.00912
Sonnet 5.5 $0.00002 $0.00456
Haiku 4.5 $0.00001 $0.00228

Measured 1mo ago against content hash e8733db6df0c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 1mo 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.

src/bcbench/agent/shared/instructions/microsoft-BCApps/agents/ALTest.agent.md · 268 lines

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 after begin
  • // [SCENARIO <WorkItemID>] on next line - work item ID is REQUIRED: // [SCENARIO 123456] Description
  • Initialize(); 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 (NOT C, V, CustNo, VendNo)
  • Use rounded amounts without decimals </structure_rules>

<build_robustness_rules>

Read the full file on GitHub · 268 lines

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.

  1. 1mo ago First seen · 268 lines · 9 tokens per session scan A e8733db6df0c

Subscribe to this mod's changes

ALTest is an agent published in the GitHub repository microsoft/BC-Bench (58 stars, last pushed today), licensed MIT. It adds 9 tokens to every session and 2,279 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 2026-08-30.

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