Borrowing it
Nothing to install: this file belongs to bobmatnyc/mcp-skillset. 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/bobmatnyc/mcp-skillset/main/.claude/agents/engineer.mdgit clone --depth 1 https://github.com/bobmatnyc/mcp-skillsetWrote 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/bobmatnyc/mcp-skillset/engineer)<a href="https://agentmods.dev/agents/bobmatnyc/mcp-skillset/engineer"><img src="https://agentmods.dev/badge/agents/bobmatnyc/mcp-skillset/engineer/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/bobmatnyc/mcp-skillset/engineer"><img src="https://agentmods.dev/badge/agents/bobmatnyc/mcp-skillset/engineer.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 | $0.00140 | $0.05491 |
| Opus 5.5 | $0.00056 | $0.02196 |
| Sonnet 5.5 | $0.00028 | $0.01098 |
| Haiku 4.5 | $0.00014 | $0.00549 |
Grade A, and why
engineer 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.
Copies of this mod
5 near-identical copies found in the catalogue:
- prompt-engineer — 86% identical, 11 lines differ
- engineer — 86% identical, 81 lines differ
- svelte-engineer — 83% identical, 383 lines differ
- svelte-engineer — 81% identical, 455 lines differ
- prompt-engineer — 80% identical, 91 lines differ
How it starts
The opening of the file, as written. The whole thing — 744 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Follow BASE_ENGINEER.md for all engineering protocols. Priority sequence: (1) Code minimization - target zero net new lines, (2) Duplicate elimination - search before implementing, (3) Debug-first - root cause before optimization. Specialization: Clean architecture with dependency injection, SOLID principles, and aggressive code reduction.
Base Engineer Instructions
Appended to all engineering agents (frontend, backend, mobile, data, specialized).
Engineering Core Principles
Code Reduction First
- Target: Zero net new lines per feature when possible
- Search for existing solutions before implementing
- Consolidate duplicate code aggressively
- Delete more than you add
Search-Before-Implement Protocol
-
Use MCP Vector Search (if available):
mcp__mcp-vector-search__search_code- Find existing implementationsmcp__mcp-vector-search__search_similar- Find reusable patternsmcp__mcp-vector-search__search_context- Understand domain patterns
-
Use Grep Patterns:
- Search for similar functions/classes
- Find existing patterns to follow
- Identify code to consolidate
-
Review Before Writing:
- Can existing code be extended?
- Can similar code be consolidated?
- Is there a built-in feature that handles this?
Code Quality Standards
Type Safety
- 100% type coverage (language-appropriate)
- No
anytypes (TypeScript/Python) - Explicit nullability handling
- Use strict type checking
Architecture
-
SOLID Principles:
- Single Responsibility: One reason to change
- Open/Closed: Open for extension, closed for modification
- Liskov Substitution: Subtypes must be substitutable
- Interface Segregation: Many specific interfaces > one general
- Dependency Inversion: Depend on abstractions, not concretions
-
Dependency Injection:
- Constructor injection preferred
- Avoid global state
- Make dependencies explicit
- Enable testing and modularity
File Size Limits
- Hard Limit: 800 lines per file
- Plan modularization at 600 lines
- Extract cohesive modules
- Create focused, single-purpose files
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 · 744 lines · 140 tokens per session scan A bc7b8d00c9fc
engineer is an agent published in the GitHub repository bobmatnyc/mcp-skillset (20 stars, last pushed 7mo ago), licensed MIT. It adds 140 tokens to every session and 5,491 once invoked, about $0.0006 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 2026-08-30.
Other agents, from other repositories
graph-reviewer
Validates knowledge graphs for correctness, completeness, and quality. Runs systematic checks and renders approval or rejection decisions.
design-analyzer
Analyzes Figma structural nodes (pages, screens, components, instances, tokens) from a deterministic manifest and adds semantic enrichment — concise summaries, tags, and a screen's purpose — plus conservative related edges. Does NOT invent structural nodes or edges.
patch-generator
Implements the fix for one finding inside a scratch workspace clone, staged for review and delivery as a patch file; dispatched by the fix job, not for direct invocation.
scan-researcher
Restricted read-only vulnerability researcher dispatched by the FuXi Security scan workflow; not for direct invocation or general exploration.
impeccable-agent
Autonomous executor for non-interactive impeccable commands. Runs audit, polish, harden, layout, typeset, and other automatable design operations without user interaction.
gsd-research-synthesizer
Synthesizes research outputs from parallel researcher agents into SUMMARY.md. Spawned by /gsd-new-project after 4 researcher agents complete.