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Kai Ase Siren

Kai Ase Siren is a senior platform engineer. Policy bound agent systems, developer infrastructure, and the platform layer underneath. What a tool may run stays occluded until policy grants it. One guardfile becomes a guarded MCP server with a natural flow. Every agent role is cast from a single YAML roster, and the context each one loads is composed into a bundle you can diff before it runs.

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For agents: Personal site of senior platform engineer Kai Ase Siren: policy-bound agent systems, guarded MCP servers, contracting and hiring pages, resume and writing archi

policy-bound agentsmcp serverplatform engineeringagent boundariesdeveloper infrastructure

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AI agents and MCP · Personal sites and blogs
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Documentation: developer or product docs worth reading, nothing to call
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2026-10-18T15:08:55.423Z
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The beginning of the file, from our validated copy saved 2026-10-21T14:29:46.422Z. Cached copy · Source on coilysiren.me

# Kai Ase Siren

> Kai Ase Siren is a senior platform engineer. Policy bound agent systems, developer infrastructure, and the platform layer underneath. What a tool may run stays occluded until policy grants it. One guardfile becomes a guarded MCP server with a natural flow. Every agent role is cast from a single YAML roster, and the context each one loads is composed into a bundle you can diff before it runs.

Use the pages below as the canonical public profile. Other routes are retained only for archival compatibility and should not be treated as current.

## Public pages

- [Home](https://www.coilysiren.me/): Current platform thesis and active portfolio.
- [About](https://www.coilysiren.me/about/): Biography, visual autobiography, and collected interests.
- [Contracting](https://www.coilysiren.me/contracting/): Platform engineering by the hour, agent boundaries as the specialism, and engagement terms.
- [Hiring](https://www.coilysiren.me/hiring/): Role fit, practical constraints, and interview boundaries.
- [Resume](https://www.coilysiren.me/resume/): Canonical experience and impact record.

## Projects

- [umbra](https://umbra.coilyco.ai/): Occlusion for agent CLIs and APIs. Declare what an agent may run, and everything you did not name stays unreachable.
- [housecast](https://housecast.coilyco.ai/): Human-graded behavior evaluations for any agent. Each answer goes in front of a person, with its target beside it, and the grade is recorded.
- [agent-compose, archived](https://acompose.coilyco.ai/): agent-compose composed the context an agent harness loads into one bundle of plain files you could read before a run. It is no longer offered, and its source is no longer public.
- [mcp-beaver, archived](https://beaver.coilyco.ai/): mcp-beaver rendered one umbra guardfile into an MCP server and an HTTP tool API, one tool per grant. It is no longer offered, and its source is no longer public.


## housecast docs

housecast's own documentation, mounted verbatim from its repository and ordered by a manifest rather than alphabetically. The [front door](https://housecast.coilyco.ai/docs/) lists every shelf.

### Getting started

- [Features](https://housecast.coilyco.ai/docs/features/): Every capability that ships today, and what does not.

### Grading

- [Grading](https://housecast.coilyco.ai/docs/grading/): The human half, and why it ships in an extra.
- [Grading surfaces](https://housecast.coilyco.ai/docs/grading-surfaces/): One set of rules across a terminal and a browser.
- [Grading evidence](https://housecast.coilyco.ai/docs/grading-evidence/): The public and private halves of a single run.
- [The deck](https://housecast.coilyco.ai/docs/deck/): housecast grade deck ROUNDS --run RUNDIR --out DECK builds
- [The grading page](https://housecast.coilyco.ai/docs/grading-page/): housecast/grade/page/index.html renders a committed run and
- [The grading page, payloads and delivery](https://housecast.coilyco.ai/docs/grading-page-delivery/): How grading-page
…

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