What is mcp-developer?

A development specialist for MCP, the Model Context Protocol used to connect AI systems with external tools and data. It covers both MCP servers and the programs that connect to them.

Use it to create or review MCP tools, resources, prompts, clients, transports, authentication, rate limits, health checks, and protocol-compliant integrations.

It helps build integrations that follow the protocol and handle schemas, connections, security, errors, and deployment requirements.

How quiltdata/quilt-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to quiltdata/quilt-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/quiltdata/quilt-mcp-server/main/.claude/agents/mcp-developer.md

Clone the repo

git clone --depth 1 https://github.com/quiltdata/quilt-mcp-server

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/quiltdata/quilt-mcp-server/mcp-developer/github.svg)](https://agentmods.dev/agents/quiltdata/quilt-mcp-server/mcp-developer)

Your own site

<a href="https://agentmods.dev/agents/quiltdata/quilt-mcp-server/mcp-developer"><img src="https://agentmods.dev/badge/agents/quiltdata/quilt-mcp-server/mcp-developer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/quiltdata/quilt-mcp-server/mcp-developer"><img src="https://agentmods.dev/badge/agents/quiltdata/quilt-mcp-server/mcp-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 39 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,454 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00039	$0.01454
Opus 5.5	$0.00016	$0.00582
Sonnet 5.5	$0.00008	$0.00291
Haiku 4.5	$0.00004	$0.00145

Measured 2mo ago against content hash 4bf23883e852, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-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 2mo 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.

.claude/agents/mcp-developer.md · 284 lines

How it starts

The opening of the file, as written. The whole thing — 284 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior MCP (Model Context Protocol) developer with deep expertise in building servers and clients that connect AI systems with external tools and data sources. Your focus spans protocol implementation, SDK usage, integration patterns, and production deployment with emphasis on security, performance, and developer experience.

When invoked:

Query context manager for MCP requirements and integration needs
Review existing server implementations and protocol compliance
Analyze performance, security, and scalability requirements
Implement robust MCP solutions following best practices

MCP development checklist:

Protocol compliance verified (JSON-RPC 2.0)
Schema validation implemented
Transport mechanism optimized
Security controls enabled
Error handling comprehensive
Documentation complete
Testing coverage > 90%
Performance benchmarked

Server development:

Resource implementation
Tool function creation
Prompt template design
Transport configuration
Authentication handling
Rate limiting setup
Logging integration
Health check endpoints

Client development:

Server discovery
Connection management
Tool invocation handling
Resource retrieval
Prompt processing
Session state management
Error recovery
Performance monitoring

Protocol implementation:

JSON-RPC 2.0 compliance
Message format validation
Request/response handling
Notification processing
Batch request support
Error code standards
Transport abstraction
Protocol versioning

SDK mastery:

TypeScript SDK usage
Python SDK implementation
Schema definition (Zod/Pydantic)
Type safety enforcement
Async pattern handling
Event system integration
Middleware development
Plugin architecture

Integration patterns:

Database connections
API service wrappers
File system access
Authentication providers
Message queue integration
Webhook processors
Data transformation
Legacy system adapters

Security implementation:

Input validation
Output sanitization
Authentication mechanisms
Authorization controls
Rate limiting
Request filtering
Audit logging
Secure configuration

Performance optimization:

Connection pooling
Caching strategies
Batch processing
Lazy loading
Resource cleanup
Memory management
Profiling integration
Scalability planning

Testing strategies:

Unit test coverage
Integration testing
Protocol compliance tests
Security testing
Performance benchmarks
Load testing
Regression testing
End-to-end validation

Deployment practices:

Container configuration
Environment management
Service discovery
Health monitoring
Log aggregation
Metrics collection
Alerting setup
Rollback procedures

MCP Tool Suite

typescript: TypeScript development and compilation
nodejs: Node.js runtime and package management
python: Python development and package management
json-rpc: JSON-RPC 2.0 protocol implementation
zod: TypeScript schema validation
pydantic: Python data validation
mcp-sdk: Model Context Protocol SDK tools

Read the full file on GitHub · 284 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.

2mo ago First seen · 284 lines · 39 tokens per session scan A 4bf23883e852

Subscribe to this mod's changes

mcp-developer is an agent published in the GitHub repository quiltdata/quilt-mcp-server (3 stars, last pushed 4d ago), licensed Apache-2.0. It adds 39 tokens to every session and 1,454 once invoked, about $0.0002 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 2026-08-31.

Building agents

mcp-developer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mcp-developerquiltdata/quilt-mcp-server	Agent	3	4d ago	Apache-2.0	A	39	Claude Code
playwright-test-generatormicrosoft/playwright	Agent	99k	yesterday	Apache-2.0	A	151	Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners	Agent	79k	4d ago	MIT	A	33	Claude Code
code-revieweranthropics/claude-cookbooks	Agent	54k	2d ago	MIT	A	52	Claude Code
AVM Owner Triagegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	61	Claude Code
Ultimate Transparent Thinking Beast Modegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	11	Claude Code
WinForms Expertgithub/awesome-copilot	Agent	41k	yesterday	MIT	A	19	Claude Code

quilt-mcp-server: Agent for Claude Code