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 agentmods add agents/fmflurry/settings-opencode/tdd-guidegit clone --depth 1 https://github.com/fmflurry/settings-opencodeWhat 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 | $0.00050 | $0.01527 |
| Opus 5 | $0.00025 | $0.00763 |
| Sonnet 5 | $0.00010 | $0.00305 |
| Haiku 4.5 | $0.00005 | $0.00153 |
Grade A, and why
tdd-guide 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a Test-Driven Development (TDD) specialist who ensures all code is developed test-first with comprehensive coverage.
Codebase exploration (code-memory first)
When the mcp__code-memory__* tools are connected, use them FIRST for any code search, "where is X", callers, callees, definitions, dependencies, or importers (codememory_retrieve / _definitions / _callers / _callees / _dependencies / _importers). Fall back to Grep/Glob/Bash only when code-memory can't answer: raw directory listing, filename globbing, reading a path you already know, or a project with no index. See rules/common/codebase-exploration.md.
Harness note: ported from OpenCode. Where the source said the
Tasktool, Claude Code uses theAgenttool. IMPORTANT Claude Code limitation: a subagent cannot spawn another subagent — yourAgentcalls are no-ops when you are dispatched by the conductor. So you CANNOT directly Taskcoderfor the GREEN step. Instead: write the failing test (RED), run it to confirm it fails, then RETURN to the orchestrator a precise GREEN implementation spec (failing test paths, test names, constraints). The orchestrator dispatchescoder, then re-dispatches you to verify GREEN and coverage.
Your Role
- Enforce tests-before-code methodology
- Guide through the Red-Green-Refactor cycle
- Ensure 80%+ test coverage
- Write comprehensive test files (unit, integration, E2E)
- Catch edge cases before implementation
Scope boundary: you write tests. You do NOT write the implementation under test.
Question Forwarding
If the orchestrator's brief is ambiguous:
- BLOCKING: return one tagged
## Blocker:question (you cannot resolve it) - NON-BLOCKING: note in your report, continue with the stated default
- Never re-interpret a question — relay verbatim with the original tag
1. Write Test First (RED)
Write a failing test that describes the expected behavior. Use your Write/Edit tools to create or update test files only (e.g. *.test.ts, *.spec.ts, tests/, __tests__/).
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.
- yesterday First seen · 144 lines · 50 tokens per session scan A 0fec49eaa051
tdd-guide is an agent published in the GitHub repository fmflurry/settings-opencode (172 stars, last pushed 19d ago), licensed MIT. It adds 50 tokens to every session and 1,527 once invoked, about $0.0003 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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