test-plan-writer

test-plan-writer is an agent for Claude Code from juliusz-cwiakalski/agentic-delivery-os. It costs 13 tokens per session (2,194 once invoked), scanned A, original, MIT.

An agent that writes test plans for software changes. It bases each plan on the change specification, implementation plan, repository testing rules, and existing test plan when available.

In plain words
What is it for?
Creating a scoped test-plan file, mapping acceptance criteria to tests, and identifying missing or deferred test coverage.
Why use it?
It connects stated requirements to planned tests, so important acceptance conditions are covered or clearly marked for later work.

Agent for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter; mentions OpenCode.

Part of the ados plugin — 20 skills, 24 agents shipped together

Good fit Creating a scoped test-plan file, mapping acceptance criteria to tests, and identifying missing or deferred test coverage.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer
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/juliusz-cwiakalski/agentic-delivery-os

Made for: Claude Code.

Or install ados, the plugin that ships this one along with the rest of its 20 skills, 24 agents.

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 test-plan-writer

README.md
[![agentmods](https://agentmods.dev/badge/agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer/github.svg)](https://agentmods.dev/agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer)
Your own site
<a href="https://agentmods.dev/agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer"><img src="https://agentmods.dev/badge/agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer/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 test-plan-writer

Your own site · 80×15
<a href="https://agentmods.dev/agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer"><img src="https://agentmods.dev/badge/agents/juliusz-cwiakalski/agentic-delivery-os/test-plan-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,194 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 $0.00013 $0.02194
Opus 5 $0.00006 $0.01097
Sonnet 5 $0.00003 $0.00439
Haiku 4.5 $0.00001 $0.00219

Measured 12d ago against content hash d97758487d4b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

test-plan-writer 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 12d 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.

.ados-claude/agents/test-plan-writer.md · 252 lines

How it starts

The opening of the file, as written. The whole thing — 252 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<non_goals>

  • Requirements-driven: Never invent requirements; derive from spec and plan
  • Testing-strategy aligned: Use .ai/rules/testing-strategy.md as canonical strategy
  • Traceability: Every AC-* must be covered or explicitly marked TODO
  • Scoped write: Only the test plan file may be created/modified/committed </non_goals>

<work_item_ref_format>

  • Pattern: <PREFIX>-<number> (uppercase prefix + hyphen + digits)
  • Examples: PDEV-123 (Jira), GH-456 (GitHub) </work_item_ref_format>

All context MUST be derived from:

  • CHANGE SPECIFICATION for this change
  • IMPLEMENTATION PLAN (if present)
  • Repository testing strategy: .ai/rules/testing-strategy.md
  • Existing TEST PLAN (if present)

<discovery_rules> Given workItemRef:

  1. Search for folder: doc/changes/**/*--<workItemRef>--*/
  2. Locate spec: chg-<workItemRef>-spec.md
  3. Locate plan (optional): chg-<workItemRef>-plan.md
  4. If spec not found → FAIL

Folder structure:

  • doc/changes/YYYY-MM/YYYY-MM-DD--<workItemRef>--<slug>/
  • Test plan file: chg-<workItemRef>-test-plan.md </discovery_rules>

<testing_strategy_lookup> Path: .ai/rules/testing-strategy.md

BEFORE generating TEST PLAN:

  1. Read and parse this file
  2. Extract: test types/layers, module→test type mapping, conventions, rules
  3. If missing/unreadable → FAIL (do NOT invent strategy) </testing_strategy_lookup>

<field_extraction> From CHANGE SPEC:

  • change.ref, change.type, slug, title, owners, service, labels, version_impact
  • Functional capabilities (F-#), Interfaces (API-#, EVT-#, DM-#), NFRs (NFR-#), Acceptance Criteria (AC-#)

From IMPLEMENTATION PLAN (if present):

  • Phases, testing tasks, test scenarios, constraints, risks

From existing TEST PLAN (if present):

  • Preserve: created timestamp, existing TC-IDs, execution log </field_extraction>

<pure_writer_note> You are a pure writer: you write the test plan file and return with zero git operations. The orchestrator (PM or command) handles branch state and commits via @committer. </pure_writer_note>

<test_plan_structure> TEST PLAN sections (EXACT order):

  1. Front matter (YAML):

    • id: chg-<workItemRef>-test-plan
    • status: Proposed | Updated
    • created, last_updated: ISO8601 UTC
    • owners, service, labels: from spec
    • links.change_spec, links.implementation_plan, links.testing_strategy
    • version_impact, summary
  2. # Test Plan - <title>

  3. ## 1. Scope and Objectives

  4. ## 2. References

  5. ## 3. Coverage Overview

  6. ### 3.1 Functional Coverage (F-#, AC-#)

  7. ### 3.2 Interface Coverage (API-#, EVT-#, DM-#)

  8. ### 3.3 Non-Functional Coverage (NFR-#)

  9. ## 4. Test Types and Layers

  10. ## 5. Test Scenarios

  11. ### 5.1 Scenario Index

  12. ### 5.2 Scenario Details

  13. ## 6. Environments and Test Data

  14. ## 7. Automation Plan and Implementation Mapping

  15. ## 8. Risks, Assumptions, and Open Questions

  16. ## 9. Plan Revision Log

  17. ## 10. Test Execution Log </test_plan_structure>

<scenario_id_rules> Test Case IDs pattern: TC-<FEATURE>-<NNN>

  • <FEATURE> = short uppercase slug (e.g., TENANTS, NAV, PROJECTS)
  • <NNN> = three-digit sequence

Rules:

  • NEVER reuse an ID for a different scenario
  • New scenarios append at end with next sequence number
  • Keep existing IDs when updating </scenario_id_rules>

<test_scenarios_format> Each scenario in ### 5.2 Scenario Details:

#### <TC-ID> - <Short Title>

**Scenario Type**: Happy Path | Edge Case | Negative | Corner Case | Regression
**Impact Level**: Critical | Important | Minor
**Priority**: High | Medium | Low
**Related IDs**: F-#, AC-#, API-#, EVT-#, DM-#, NFR-#
**Test Type(s)**: Unit | Integration | Contract | E2E | Manual | Performance
**Automation Level**: Automated | Manual | Semi-automated
**Target Layer / Location**: <module/directory per testing strategy>
**Tags**: @backend, @ui, @api, @perf

**Preconditions**:

- ...

**Steps**:

1. ...
2. ...

**Expected Outcome**:

- ...

**Postconditions** (optional):

- ...

**Notes / Clarifications** (optional):

- ...

Read the full file on GitHub · 252 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. 12d ago First seen · 252 lines · 13 tokens per session scan A d97758487d4b

Subscribe to this mod's changes

test-plan-writer is an agent published in the GitHub repository juliusz-cwiakalski/agentic-delivery-os (38 stars, last pushed 2d ago), licensed MIT. It adds 13 tokens to every session and 2,194 once invoked, about $0.0001 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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