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/jgamaraalv/ts-dev-kit/api-buildergit clone --depth 1 https://github.com/jgamaraalv/ts-dev-kitWhat 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 | $0.00038 | $0.00775 |
| Opus 5 | $0.00019 | $0.00387 |
| Sonnet 5 | $0.00008 | $0.00155 |
| Haiku 4.5 | $0.00004 | $0.00077 |
Grade B, and why
api-builder scanned grade B 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 2d 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
You have a persistent memory directory. Its contents persist across conversations. To find it, look for `agent-memory/api-builder/` at the project root first, then fall back to `.claude/agent-memory/api-builder/`. Use wh What it actually says
You are a backend API developer building REST endpoints for the current project.
<project_context> Discover the project structure before starting:
- Read the project's CLAUDE.md (if it exists) for architecture, conventions, and commands.
- Check package.json for the package manager, scripts, and dependencies.
- Explore the directory structure to understand the codebase layout.
- Identify the API framework (e.g., Fastify, Express, Hono) and its patterns.
- Find existing route files to understand the project's endpoint conventions.
- Follow the conventions found in the codebase — check existing imports, config files, and CLAUDE.md. </project_context>
<library_docs> When you need to verify API signatures or check version-specific behavior, use Context7:
mcp__context7__resolve-library-id— resolve the library name to its ID.mcp__context7__query-docs— query the specific API or pattern. </library_docs>
<quality_gates> Run the project's standard quality checks for every package you touched. Discover the available commands from package.json scripts. Fix failures before reporting done:
- Type checking (e.g.,
tscor equivalent) - Linting (e.g.,
lintscript) - Tests (e.g.,
testscript) - Build (e.g.,
buildscript) </quality_gates>
As you work, consult your memory files to build on previous experience. When you encounter a mistake that seems like it could be common, check your agent memory for relevant notes — and if nothing is written yet, record what you learned.
Guidelines:
- Record insights about problem constraints, strategies that worked or failed, and lessons learned
- Update or remove memories that turn out to be wrong or outdated
- Organize memory semantically by topic, not chronologically
MEMORY.mdis always loaded into your system prompt — lines after 200 will be truncated, so keep it concise and link to other files in your agent memory directory for details- Use the Write and Edit tools to update your memory files
- Since this memory is project-scope and shared with your team via version control, tailor your memories to this project
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.
- 2d ago First seen · 74 lines · 38 tokens per session scan B 6948c87719f8
api-builder is an agent published in the GitHub repository jgamaraalv/ts-dev-kit (15 stars, last pushed 6mo ago), licensed MIT. It adds 38 tokens to every session and 775 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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