Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/danielvm-git/bigpowersnpx agentmods add skills/danielvm-git/bigpowers/develop-tddWrote 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.
[](https://agentmods.dev/skills/danielvm-git/bigpowers/develop-tdd)<a href="https://agentmods.dev/skills/danielvm-git/bigpowers/develop-tdd"><img src="https://agentmods.dev/badge/skills/danielvm-git/bigpowers/develop-tdd/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.
<a href="https://agentmods.dev/skills/danielvm-git/bigpowers/develop-tdd"><img src="https://agentmods.dev/badge/skills/danielvm-git/bigpowers/develop-tdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 3 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
- medium Agent Snooping · line 130 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00038 | $0.03618 |
| Opus 5.5 | $0.00015 | $0.01447 |
| Sonnet 5.5 | $0.00008 | $0.00724 |
| Haiku 4.5 | $0.00004 | $0.00362 |
Grade A, and why
develop-tdd scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
fetch: (endpoint, options) => fetch(endpoint, options), How it starts
The opening of the file, as written. The whole thing — 417 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Develop TDD
HARD GATE — Do NOT proceed if on
mainormaster. Runkickoff-branchfirst to create a feature branch or worktree.HARD GATE — Do NOT write code before you have a plan. New feature:
plan-work→ epic capsule tasks. Bug:investigate-bug→specs/bugs/BUG-*.md(or usefix-bugorchestrator).RECURSIVE DISCIPLINE — This lifecycle applies to EVERY task, including updating these skills. Never skip planning because a task is "meta" or "just documentation."
Philosophy
Tests verify behavior through public interfaces, not implementation details. A good test reads like a specification. See REFERENCE.md for the horizontal-slice anti-pattern and TDD phase detail.
Red Flags
If you catch yourself thinking these, stop and reconsider — you are likely deviating from production-grade craft.
| Red Flag | Reality |
|---|---|
| "This is too simple to need tests." | Simple code is where bugs hide. If it's simple, the test is cheap. |
| "I'll refactor this later." | "Later" is when technical debt becomes bankruptcy. Refactor while Green. |
| "The tests are already comprehensive." | If you're adding behavior, you need a new test. Coverage ≠ Correctness. |
| "I'm just fixing a small bug." | Small bugs often indicate deep interface flaws. Investigate root cause. |
| "I need to mock this internal class." | Mocking internals couples tests to implementation. Mock only I/O. |
| "This refactor is out of scope." | Leave the code cleaner than you found it (Boy Scout Rule). |
| "Preflight failed but it's unrelated." | Always Green: any reproducible gate failure routes quick-fix → fix-bug before forward work. Session boundaries do not waive Preflight. |
| "I'll note the red gate and continue." | Narrating a failure is banned. fix-or-log is mandatory per CONVENTIONS § Discovered Defects. |
Workflow
Timing:
bash scripts/bp-timing.sh start develop-tddat invocation;bash scripts/bp-timing.sh end develop-tddbefore handoff.
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.
- 1mo ago First seen · 417 lines · 38 tokens per session scan A 4d3eb8b65b21
develop-tdd is a skill published in the GitHub repository danielvm-git/bigpowers (266 stars, last pushed 24d ago), licensed MIT. It adds 38 tokens to every session and 3,618 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
workflow-patterns
Use this skill when implementing tasks according to Conductor's TDD workflow, handling phase checkpoints, managing git commits for tasks, or understanding the verification protocol.
testing
TDD/BDD testing principles. Use when writing tests, reviewing test coverage, setting up testing, or discussing test strategy and test architecture.
workflow-analysis
Analyse obligatoire en 4 étapes (comprendre, analyser, documenter, valider) avant toute modification de code, puis implémentation TDD. Use when starting a feature, bugfix or refactoring, or before touching existing code with unclear impact.
nested-fixture-pattern
This skill should be used when working on Java projects with JUnit tests that have layered preconditions, expensive shared setup (servers, databases, provisioned users), or complex scenario trees. Trigger phrases include "nested fixture", "fixture pattern", "scenario tree", "layered test setup", or when the user is…
maven
Always load this skill when a pom.xml file exists in the project, when creating or editing a pom.xml, or when setting up Maven project structure in a new project. It provides Maven-specific conventions for running tests, building, managing dependencies, and project structure.
app
This skill should be used when the user asks to "calculate code mass", "measure code complexity with APP", "compare implementations using APP", "apply Absolute Priority Premise", "use mass calculations", or during TDD refactor phases when comparing alternative implementations. Based on Micah Martin's work.