What is aws-messaging-mcp CLAUDE.md?

A set of Claude Code instructions for an AWS-hosted MCP server that provides tools for Amazon SES email, AWS messaging SMS/MMS, and CloudFront-signed file sharing. Amazon SES sends email, while CloudFront is AWS's content-delivery service.

Guiding implementation, local testing, and deployment preparation for the AWS messaging server, including email, text or multimedia messages, and signed file sharing.

It keeps development and deployment within stated safety rules, such as reviewing the product requirements first, protecting secrets, and requiring approval before creating billable AWS resources.

How gesparza8138/aws-messaging-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to gesparza8138/aws-messaging-mcp. 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/gesparza8138/aws-messaging-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/gesparza8138/aws-messaging-mcp

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/instructions/gesparza8138/aws-messaging-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/gesparza8138/aws-messaging-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/gesparza8138/aws-messaging-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/gesparza8138/aws-messaging-mcp/claude-md/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/instructions/gesparza8138/aws-messaging-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/gesparza8138/aws-messaging-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,344 This file is loaded in full into every session.

When invoked 1,344 The same file — it is already loaded in full.

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	$0.01344	$0.01344
Opus 5.5	$0.00538	$0.00538
Sonnet 5.5	$0.00269	$0.00269
Haiku 4.5	$0.00134	$0.00134

Measured 2mo ago against content hash 72085204c5c6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

aws-messaging-mcp CLAUDE.md 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.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — aws-messaging-mcp

Project conventions for Claude Code. Read docs/PRD.md before planning anything; it is the source of truth for scope, architecture, auth, guardrails, and milestones.

What this is

A stateless MCP server (Streamable HTTP) on AWS Lambda that exposes tools for Amazon SES email, AWS End User Messaging SMS/MMS (RCS descoped - PRD Appendix C), and CloudFront-signed file sharing. Single owner (Gabe), clients are Claude Code and Claude Desktop/Routines. Single AWS account (ID not recorded in this public repo — aws sts get-caller-identity locally, GitHub secret AWS_ACCOUNT_ID in CI), region us-west-2, hostnames mcp.gabriel-esparza.com (prod) and dev.mcp.gabriel-esparza.com (dev).

Hard rules

Ask before any AWS deploy or any action that creates billable resources (aws cloudformation deploy, make deploy-dev, requesting phone numbers, registrations, domain changes). Show the change set or the command first and wait for an explicit yes. This applies to dev as well as prod.
Never deploy to prod from a local machine. Prod is reached only via the GitHub release workflow after manual approval.
No secrets in the repo, ever. Not in code, templates, params files, tests, docs, or commit messages. Secrets live in SSM Parameter Store (AWS) or GitHub environment secrets. If you need a value for a test, generate it in the test.
Pure CloudFormation. No SAM, no CDK, no Terraform. Templates live in infra/, are YAML, and must pass cfn-lint, checkov, and cfn_nag.
Tool schemas mirror the AWS API. Property names and nesting are the PascalCase shapes of the underlying sesv2 / pinpoint-sms-voice-v2 / s3 request (what --cli-input-json accepts). Server-controlled fields are injected or validated, not exposed. Contract tests enforce this by reflection over the AWS SDK for Go v2 input types (sesv2.SendEmailInput etc.).
Every send tool supports DryRun and runs the guardrails in src/aws_messaging_mcp/guardrails/ before calling boto3.
Files bucket and media bucket stay separate. Only the files bucket is behind CloudFront.
Docs are GitHub-flavored Markdown in docs/; keep Mermaid, [!NOTE] admonitions, and relative links working. markdownlint-cli2 and lychee run in CI.

Read the full file on GitHub · 50 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 · 50 lines · 1,344 tokens per session scan A 72085204c5c6

Subscribe to this mod's changes

aws-messaging-mcp CLAUDE.md is an instructions file published in the GitHub repository gesparza8138/aws-messaging-mcp (0 stars, last pushed 5d ago), licensed MIT. It adds 1,344 tokens to every session, about $0.0054 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.

Backend and APIs

aws-messaging-mcp CLAUDE.md next to 6 instructions from other repositories
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aws-messaging-mcp: Instructions file for Claude Code