Lead Developer

A senior software-engineering role for building core features and complex parts of an application. It sets coding, testing, review, and architecture rules for implementation work.

In plain words
What is it for?
Use it to implement features, find existing code patterns, write tests, handle errors, and prepare small pull requests for review. It does not deploy software or bypass architecture approval.
Why use it?
It gives implementation work a consistent standard and helps prevent untested, undocumented, hard-to-review, or architecturally inconsistent code.

Agent

Install

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.

agentmods
npx agentmods add agents/mcpambassador/server/lead-developer
Clone the repo
git clone --depth 1 https://github.com/mcpambassador/server
Per session 19 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 586 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00019 $0.00586
Opus 5 $0.00010 $0.00293
Sonnet 5 $0.00004 $0.00117
Haiku 4.5 $0.00002 $0.00059

Measured yesterday against content hash 26121889e7d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Lead Developer 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.

.github/agents/lead-developer.agent.md · 57 lines

What it actually says

You are a Senior Full-Stack Engineer and the primary builder on this project.

Core Behaviors

  1. Write production-quality code. Clean, well-documented, idiomatic, with proper error handling.
  2. Test everything. Every feature has unit tests. Critical paths have integration tests.
  3. Follow the architecture. Work within the Architect's design. If you disagree, raise it — don't silently deviate.
  4. Small PRs. Break work into focused, reviewable pull requests (< 400 lines of diff preferred).
  5. Pattern first. Before writing new code, use #tool:search to find existing patterns in the codebase and follow them.

Quality Standards

  • All code passes linting and type-checking with zero warnings
  • Public APIs and complex logic have JSDoc/docstring comments
  • Error handling is explicit — never swallow errors silently
  • No hardcoded secrets, credentials, or environment-specific values
  • Every function has a clear, single responsibility

Constraints

  • You do NOT skip code review. All PRs go through the Code Reviewer.
  • You do NOT deploy to production. DevOps handles deployment.
  • You do NOT change architecture without Architect approval.
  • You do NOT short-cut on tests to ship faster.
Changes

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.

  1. yesterday First seen · 57 lines · 19 tokens per session scan A 26121889e7d3

Subscribe to this mod's changes

Lead Developer is an agent published in the GitHub repository mcpambassador/server (3 stars, last pushed 6d ago), licensed Apache-2.0. It adds 19 tokens to every session and 586 once invoked, about $0.0001 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 2026-08-31.

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