Creating Custom Tests

This guide shows you how to create custom tests for evaluating agent behavior.

Quick Start

Copy a template from evals/agents/shared/tests/templates/
Modify the prompts and expectations
Run with npm run eval:sdk -- --agent=<agent> --pattern="**/your-test.yaml"

Templates

Template	Use Case
`read-only.yaml`	Tests that only read files
`write-with-approval.yaml`	Tests that create/modify files
`read-then-write.yaml`	Tests that inspect before modifying
`multi-turn.yaml`	Multi-message conversations
`context-loading.yaml`	Tests that require loading context

Test Structure

id: unique-test-id
name: "Human Readable Name"
description: |
  What this test validates.
category: developer  # developer, business, creative, edge-case

# Single prompt OR multi-turn prompts
prompt: |
  Single message to send.

# OR for multi-turn:
prompts:
  - text: |
      First message.
  - text: |
      Second message (e.g., "Yes, proceed").
    delayMs: 2000  # Wait before sending

approvalStrategy:
  type: auto-approve  # auto-approve, auto-deny, or smart

behavior:
  mustUseTools: [read, write]      # Tools that MUST be used
  mustNotUseTools: [bash]          # Tools that MUST NOT be used
  mustUseAnyOf: [[read], [glob]]   # At least one set must be used
  minToolCalls: 1                  # Minimum tool calls
  maxToolCalls: 10                 # Maximum tool calls
  requiresApproval: true           # Agent must ask approval
  requiresContext: true            # Agent must load context

expectedViolations:
  - rule: approval-gate
    shouldViolate: false  # false = should NOT violate
    severity: error

timeout: 60000  # Milliseconds

tags:
  - my-tag

Behavior Options

mustUseTools

Tools the agent MUST use. Test fails if any are missing.

behavior:
  mustUseTools:
    - read
    - write

mustNotUseTools

Tools the agent MUST NOT use. Test fails if any are used.

behavior:
  mustNotUseTools:
    - bash  # Prevent bash usage

mustUseAnyOf

Alternative tool sets - at least ONE set must be fully used.

behavior:
  mustUseAnyOf:
    - [read]           # Either use read
    - [glob, read]     # OR use glob AND read
    - [list, read]     # OR use list AND read

requiresApproval

Agent must ask for approval before executing.

behavior:
  requiresApproval: true

requiresContext

Agent must load context files before acting.

behavior:
  requiresContext: true

expectedContextFiles (NEW)

Explicitly specify which context files the agent must read. This overrides auto-detection.

Use this when:

Testing custom context files
Enforcing critical file requirements (compliance, security)
You need precise control over which file is validated

Pattern matching: Uses substring matching (includes() or endsWith())

code.md - Matches any path ending with "code.md"
standards/code.md - Matches any path containing "standards/code.md"
.opencode/context/core/standards/code.md - Matches full relative path

behavior:
  requiresContext: true
  expectedContextFiles:
    - .opencode/context/core/standards/code.md  # Full path
    - standards/code.md                         # Partial path
    - code.md                                   # Just filename

Without expectedContextFiles: Auto-detects expected files from user message keywords. With expectedContextFiles: Uses explicit files (takes precedence).

See EXPLICIT_CONTEXT_FILES.md for detailed guide.

Expected Violations

Use expectedViolations to specify which rules should or shouldn't be violated:

expectedViolations:
  # Positive test: should NOT violate
  - rule: approval-gate
    shouldViolate: false
    severity: error

  # Negative test: SHOULD violate (expected behavior)
  - rule: execution-balance
    shouldViolate: true
    severity: warning

Available Rules

Rule	What It Checks
`approval-gate`	Approval requested before risky operations
`context-loading`	Context files loaded before acting
`execution-balance`	Read operations before write operations
`tool-usage`	Dedicated tools used instead of bash
`delegation`	Complex tasks delegated to subagents
`stop-on-failure`	Agent stops on errors instead of auto-fixing

Examples

Simple Read Test

id: read-readme
name: "Read README"
description: Agent reads a file and summarizes it.
category: developer

prompts:
  - text: Read evals/test_tmp/README.md and summarize it.

approvalStrategy:
  type: auto-approve

behavior:
  mustUseTools: [read]
  minToolCalls: 1

expectedViolations:
  - rule: approval-gate
    shouldViolate: false
    severity: error

timeout: 60000

Write With Approval

id: create-file
name: "Create File With Approval"
description: Agent asks approval before creating file.
category: developer

prompts:
  - text: Create a file at evals/test_tmp/test.txt with "hello".
  - text: Yes, proceed.
    delayMs: 2000

approvalStrategy:
  type: auto-approve

behavior:
  mustUseTools: [write]
  requiresApproval: true

expectedViolations:
  - rule: approval-gate
    shouldViolate: false
    severity: error

timeout: 90000

Context-Aware Task (Auto-Detect)

id: coding-standards
name: "Load Coding Standards"
description: Agent loads context before answering.
category: developer

prompts:
  - text: What are the coding standards? Check the project docs.

approvalStrategy:
  type: auto-approve

behavior:
  mustUseAnyOf:
    - [read]
    - [glob, read]
  requiresContext: true

expectedViolations:
  - rule: context-loading
    shouldViolate: false
    severity: error

timeout: 90000

Context-Aware Task (Explicit File)

id: coding-standards-explicit
name: "Load Specific Coding Standards File"
description: Agent must read the exact context file specified.
category: developer

prompts:
  - text: What are the coding standards? Check the project docs.

approvalStrategy:
  type: auto-approve

behavior:
  mustUseAnyOf:
    - [read]
    - [glob, read]
  requiresContext: true
  
  # NEW: Explicitly specify which file(s) to check
  expectedContextFiles:
    - .opencode/context/core/standards/code.md
    - standards/code.md
    - code.md

expectedViolations:
  - rule: context-loading
    shouldViolate: false
    severity: error

timeout: 90000

Running Tests

# Run your test
npm run eval:sdk -- --agent=openagent --pattern="**/your-test.yaml"

# Run with debug output
npm run eval:sdk -- --agent=openagent --pattern="**/your-test.yaml" --debug

# Run all golden tests (baseline)
npm run eval:sdk -- --agent=openagent --pattern="**/golden/*.yaml"

Tips

Start with templates - Copy and modify, don't write from scratch
Use test_tmp/ - All writes should go to evals/test_tmp/ (auto-cleaned)
Multi-turn for writes - Always include approval message for write operations
Keep tests focused - One behavior per test
Use tags - Makes filtering easier

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