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 skills add fall-out-bug/sdp --skill tddgit clone --depth 1 https://github.com/fall-out-bug/sdpWrote 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/fall-out-bug/sdp/tdd)<a href="https://agentmods.dev/skills/fall-out-bug/sdp/tdd"><img src="https://agentmods.dev/badge/skills/fall-out-bug/sdp/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/fall-out-bug/sdp/tdd"><img src="https://agentmods.dev/badge/skills/fall-out-bug/sdp/tdd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00025 | $0.00330 |
| Opus 5.5 | $0.00010 | $0.00132 |
| Sonnet 5.5 | $0.00005 | $0.00066 |
| Haiku 4.5 | $0.00003 | $0.00033 |
Grade A, and why
tdd 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.
What it actually says
@tdd (INTERNAL)
TDD discipline. Called by @build, not users.
Cycle
- RED — Write failing test first. Run test suite (see Quality Gates in AGENTS.md) — must FAIL
- GREEN — Minimal implementation. Run test suite (see Quality Gates in AGENTS.md) — must PASS
- REFACTOR — Improve code. Run test suite (see Quality Gates in AGENTS.md) — still PASS
- COMMIT — Save state
Exit When
- All AC met
- Test suite passes (see Quality Gates in AGENTS.md)
- Static analysis passes (see Quality Gates in AGENTS.md)
Example (Go)
// RED: test first
func TestEmailValid(t *testing.T) {
v := NewValidator()
if !v.IsValid("[email protected]") { t.Error("expected valid") }
if v.IsValid("x") { t.Error("expected invalid") }
}
// Run: FAIL (undefined NewValidator)
// GREEN: minimal impl
func NewValidator() *V { return &V{} }
func (v *V) IsValid(s string) bool { return strings.Contains(s, "@") }
// Run: PASS
// REFACTOR: improve, tests still pass
For Go refactors, prefer modern stdlib idioms from @go-modern when they preserve behavior.
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 · 43 lines · 0 tokens per session scan A 7bf4e3a24d2f
tdd is a skill published in the GitHub repository fall-out-bug/sdp (19 stars, last pushed 4mo ago), licensed MIT. It adds 25 tokens to every session and 330 once invoked, about $0.0001 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 2026-09-03.
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