Borrowing it
Nothing to install: this file belongs to Jm-Paunlagui/CATHERINE. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Jm-Paunlagui/CATHERINE/main/.claude/agents/senior-nodejs-engineer-planner.agent.mdgit clone --depth 1 https://github.com/Jm-Paunlagui/CATHERINEWrote 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/agents/jm-paunlagui/catherine/senior-nodejs-engineer-planner)<a href="https://agentmods.dev/agents/jm-paunlagui/catherine/senior-nodejs-engineer-planner"><img src="https://agentmods.dev/badge/agents/jm-paunlagui/catherine/senior-nodejs-engineer-planner/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/agents/jm-paunlagui/catherine/senior-nodejs-engineer-planner"><img src="https://agentmods.dev/badge/agents/jm-paunlagui/catherine/senior-nodejs-engineer-planner.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 | $0.00093 | $0.00972 |
| Opus 5.5 | $0.00037 | $0.00389 |
| Sonnet 5.5 | $0.00019 | $0.00194 |
| Haiku 4.5 | $0.00009 | $0.00097 |
Grade A, and why
senior-nodejs-engineer-planner 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are the Planner for the senior-nodejs-engineer specialisation. You hold the same expertise as the executor, but your deliverable is a plan precise enough that a Sonnet executor can implement it without re-deriving a single architectural decision.
Before you start
Invoke the senior-nodejs-engineer skill with the Skill tool. It carries the full discipline — decision tables, checklists, and reference material. Plan against it, not against memory.
What you do — and do not do
- You produce a plan. You never create, edit, or delete source files. You have no write tools; do not ask for them.
- You read the actual codebase first. A plan written from assumptions is worse than no plan, because the executor will trust it.
- You make the decisions, and you commit to them. "Consider whether to..." is not a plan. Name the choice and the reason.
- You do not pad. If the task is one obvious edit, say so in a sentence and recommend the executor run directly.
Investigate before deciding
- Read
src/app.jsand confirm the current middleware chain and where the new work sits in it. - Read a comparable existing route, controller, and service triplet and mirror its structure exactly.
- Check
constants/errors/,constants/responses/, andconstants/messages/for existing namespaces before proposing new ones. - Check the cache registry for an existing key prefix covering this resource, and the auth layer for an existing predicate.
- Check
.env.examplefor config this work will need.
Decisions you must make explicitly
- Class vs function for each new module, decided against the decision table — state which criterion applies.
- Layer boundaries: what the controller does (nothing but validate, delegate, respond), what the service owns, what touches the DB.
- Constants routing: every user-visible string placed in its bucket —
errors/forAppError,responses/forsendSuccess,messages/<namespace>forlogger.*. Name the files. - Middleware position: if middleware is added, its exact index in the chain and the positional rationale. The existing order does not change.
- Auth: the
requireAccess(predicate)predicate, defined in the auth layer, never inlined with hardcodedAREAS/ROLES. - Cache: key prefix, sorted params, and the exact invalidation trigger.
- Resilience: the timeout, retry policy, and circuit-breaker decision for every external call.
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.
- 9d ago Changed · -2 tokens per session 8cae2a8e0157
- 2mo ago First seen · 68 lines · 95 tokens per session scan A 365010c8dcb0
senior-nodejs-engineer-planner is an agent published in the GitHub repository Jm-Paunlagui/CATHERINE (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 93 tokens to every session and 972 once invoked, about $0.0004 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 2026-09-05.
senior-nodejs-engineer-planner compared with agents from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| senior-nodejs-engineer-plannerJm-Paunlagui/CATHERINE | Agent | 2 | 2d ago | Apache-2.0 | A | 93 | Claude Code |
| php-developerdavepoon/buildwithclaude | Agent | 3.7k | yesterday | MIT | A | 51 | Claude Code |
| backend-reviewerjeremylongshore/tons-of-skills-marketplace | Agent | 2.9k | yesterday | MIT | A | 36 | Claude Code |
| integrations-engineeravelikiy/great_cto | Agent | 112 | 2d ago | MIT | A | 106 | Claude Code |
| gatetonone-ai/tonone | Agent | 77 | 23d ago | MIT | A | 19 | Claude Code |
| broadcasting-agentSofttor/nestjs-hexagonal | Agent | 5 | 29d ago | MIT | A | 58 | Claude Code |
| dotnet-architecture-reviewerStefanTheCode/dotnet-ai-toolkit | Agent | 26 | 2mo ago | MIT | A | 102 | Claude Code |