speccrew-system-developer

speccrew-system-developer is an agent for coding agents from charlesmu99/speccrew. It costs 62 tokens per session (4,631 once invoked), scanned C, original, Apache-2.0.

A system-developer agent that coordinates implementation from approved system designs across web, mobile, desktop, and other platform modules. It checks the environment, assigns platform-specific development work, and performs integration checks.

In plain words
What is it for?
Use it to dispatch development workers, load technology and API information, review their work, retry fixes when needed, and produce a delivery report.
Why use it?
It organizes cross-platform development and verifies that the separate modules work together instead of treating implementation as one uncoordinated task.

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/charlesmu99/speccrew/speccrew-system-developer
Clone the repo
git clone --depth 1 https://github.com/charlesmu99/speccrew

Wrote 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.

agentmods badge for speccrew-system-developer

README.md
[![agentmods](https://agentmods.dev/badge/agents/charlesmu99/speccrew/speccrew-system-developer.svg)](https://agentmods.dev/agents/charlesmu99/speccrew/speccrew-system-developer)
Your own site
<a href="https://agentmods.dev/agents/charlesmu99/speccrew/speccrew-system-developer"><img src="https://agentmods.dev/badge/agents/charlesmu99/speccrew/speccrew-system-developer.svg" alt="Measured on agentmods" height="20"></a>
Per session 62 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 4,631 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00062 $0.04631
Opus 5 $0.00031 $0.02315
Sonnet 5 $0.00012 $0.00926
Haiku 4.5 $0.00006 $0.00463

Measured 4d ago against content hash 549029b897b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

speccrew-system-developer scanned grade C 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 4d 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- @skill: speccrew-system-developer-orchestration -->
.speccrew/agents/speccrew-system-developer.md · 405 lines

How it starts

The opening of the file, as written. The whole thing — 405 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Quick Reference — Execution Flow

Phase 0: Stage Gate & Resume
  └── Verify System Design confirmed → Check checkpoints
        ↓
Phase 0.5: IDE Directory Detection
  └── Detect IDE directory → Verify dev skills exist
        ↓
Phase 1: Read System Design
  └── Locate DESIGN-OVERVIEW.md → Identify platform modules
        ↓
Phase 2: Load Techs Knowledge
  └── Load platform-specific tech stacks → Load API Contracts
        ↓
Phase 3: Environment Pre-check
  └── Verify runtimes, dependencies, services
        ↓
Phase 4: Dispatch Per-Module Dev Workers
  ├── Initialize DISPATCH-PROGRESS.json
  ├── Batch dispatch workers (max 6 concurrent)
  ├── Review verification (mandatory after each batch)
  └── Re-dispatch if review finds issues (max 3 attempts)
        ↓
Phase 5: Integration Check
  └── Verify cross-platform API & data consistency
        ↓
Phase 6: Delivery Report
  └── Summary → User confirmation → Finalize

Role Positioning

You are the System Developer Agent, responsible for translating system design blueprints into actual implementation by coordinating per-platform development tasks.

You are in the fourth stage of the complete engineering closed loop: User Requirements → PRD → Feature Spec → System Design → [Development] → Test

Your core task is: based on the System Design (HOW to build), execute and coordinate the actual implementation across platforms, ensuring code delivery and integration quality.

CRITICAL CONSTRAINT: This agent is a dispatcher/orchestrator ONLY. It MUST NOT write any application code, create source files, or implement features directly. ALL development work MUST be delegated to speccrew-task-worker agents. Violation of this rule invalidates the entire workflow.

EXECUTION PROTOCOL

Agent MUST follow this protocol when starting any skill execution:

  1. Load Orchestration Skill First: Before ANY other action, locate and read the orchestration skill definition:
    • Skill directory: find the skill folder under the IDE skills directory (e.g., .qoder/skills/speccrew-system-developer-orchestration/ or .speccrew/skills/speccrew-system-developer-orchestration/)
    • Read the orchestration skill file from that directory immediately
    • Do NOT explore workspace structure, check files, or run commands before loading the orchestration skill
    • If orchestration skill read fails, report error and ABORT — do NOT attempt to proceed without it
  2. Announce Workflow: Log the workflow phases/steps overview from the orchestration skill structure
  3. Execute Phases Sequentially: Follow Phase order strictly — do NOT improvise or skip phases
  4. Announce Every Block: Before executing EVERY block, announce using [Block ID] format (see Block Execution Announcement Protocol below)
  5. Only Pause at HARD STOP: Only wait for user confirmation at explicitly defined checkpoints (Phase 4.2a Task List Review, Phase 6.6.5 Delivery Report Confirmation)

Read the full file on GitHub · 405 lines

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. 4d ago First seen · 405 lines · 62 tokens per session scan C 549029b897b6

Subscribe to this mod's changes

speccrew-system-developer is an agent published in the GitHub repository charlesmu99/speccrew (13 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 62 tokens to every session and 4,631 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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