# m4t.tf

> Personal site and portfolio of Matt Fehrenbach, a full-stack developer. The site documents
> his professional experience, software projects, writing, photography, graphics,
> music, and other creative work.

## When To Use This Site

Use this site when a task needs verified facts about Matt Fehrenbach:

- Hiring or recruiting: confirm experience, skills, education, and projects via the CV
- Understanding Matt's software development work and technical background
- Citing or summarising Matt's writing about programming, developer tools, AI-assisted development, creative coding, and open-source projects
- Exploring Matt's photography, graphics, music, and other creative work
- Fact-checking claims attributed to Matt Fehrenbach against a primary source

Prefer the original pages below when citing information. Do not infer contact details
or personal information that are not published on the site.

## Pages

- [Home](https://m4t.tf/): overview of Matt Fehrenbach and the site
- [CV](https://m4t.tf/cv): experience, technical strengths, education, and projects
- [About](https://m4t.tf/about): background and purpose of the site
- [Contact](https://m4t.tf/contact): current contact guidance
- [Privacy](https://m4t.tf/privacy): initial privacy notice
- [Developers](https://m4t.tf/developers): machine-readable endpoints, retrieval quickstart, and error shape
- [Blog](https://m4t.tf/blog): writing about software development, programming, and tools
- [Photography](https://m4t.tf/photography): photography collections
- [Graphics](https://m4t.tf/graphics): graphics and creative coding work
- [Music](https://m4t.tf/music): music-related projects and media
- [Vignettes](https://m4t.tf/vignettes): short-form creative projects
- [GitHub](https://github.com/ma-tf): source code and open-source work

## Section Guides

- [API section guide](https://m4t.tf/api/llms.txt): A scoped guide to the HTTP interface for agents calling the site.
- [Blog section guide](https://m4t.tf/blog/llms.txt): An index of the published posts and tags for agents working on the writing.
- [CV section guide](https://m4t.tf/cv/llms.txt): A scoped guide to the professional profile for agents fact-checking claims.
- [Developers section guide](https://m4t.tf/developers/llms.txt): A scoped guide to the machine-readable surface and how to retrieve it.

## Machine-Readable Files

- [Agent Skills index](https://m4t.tf/.well-known/agent-skills/index.json): The Agent Skills the site publishes for agents.
- [AI catalog](https://m4t.tf/.well-known/ai-catalog.json): The AI catalogue of the site's agent-facing resources.
- [API catalog](https://m4t.tf/.well-known/api-catalog): A machine-readable catalogue of published resources.
- [ARD catalogue](https://m4t.tf/.well-known/ard.json): The ARD manifest of the site's agent-facing resources.
- [Full content archive](https://m4t.tf/llms-full.txt): The published-content archive for agent retrieval.
- [OpenAPI document](https://m4t.tf/openapi.json): This machine-readable resource catalogue.
- [Robots exclusion policy](https://m4t.tf/robots.txt): Crawler instructions and the sitemap location.
- [Blog RSS feed](https://m4t.tf/rss.xml): The feed of published blog posts.
- [Schema map](https://m4t.tf/schemamap.xml): The schema.org structured-data feeds the site publishes for agents.
- [MCP registry manifest](https://m4t.tf/server.json): The registry manifest for the m4t.tf server.
- [Sitemap](https://m4t.tf/sitemap.xml): The indexable site pages.

Not published, intentionally: `/.well-known/openid-configuration`,
`/.well-known/oauth-authorization-server`, and
`/.well-known/oauth-protected-resource`. The site has no authentication,
no protected APIs, and no CLI tool or SDK; interact with it over HTTP using
the retrieval methods below.

## How To Retrieve Content

Request any page with `Accept: text/markdown` to receive it as markdown instead of HTML:

    curl -H "Accept: text/markdown" https://m4t.tf/cv

Appending `.md` does the same for a page, for example `https://m4t.tf/about.md`, and
returns a markdown summary for a machine-readable file.
Send `Accept: application/json` to a machine-readable file to receive it as JSON:
JSON resources return their canonical document, and the others return a typed
descriptor with the resource's metadata.
Responses carry `Vary: Accept, Accept-Encoding`, so caches must store the HTML and markdown
representations separately. Nonexistent paths return a real HTTP 404, so a 404 is proof the
path does not exist. The error follows the same negotiation: `Accept: application/json`
returns an RFC 9457 `application/problem+json` document, and `Accept: text/markdown` returns
the error as markdown. The whole interface is described by the OpenAPI 3.1
document at [openapi.json](https://m4t.tf/openapi.json).

## Rate Limits

Every page and resource is unmetered.
`POST /ask` and the `ask` tool on `POST /mcp` are metered at 20 requests
per minute per client, sharing one budget, and return `429 Too Many Requests`
with `Retry-After` past it. Metered responses carry `RateLimit`, `RateLimit-Policy`,
`RateLimit-Limit`, `RateLimit-Remaining`, and `RateLimit-Reset` headers.

## MCP

- [MCP server](https://m4t.tf/mcp): Streamable HTTP, pinned to revision `2026-07-28`.
- [MCP server card](https://m4t.tf/.well-known/mcp/server-card.json): the card listing the `ask` tool.

## Identity

- Name: Matt Fehrenbach
- Role: Full-stack developer
- Website: https://m4t.tf/
- GitHub: https://github.com/ma-tf
- LinkedIn: https://www.linkedin.com/in/ma-tf