How do I install the Prefect Foundation skill?

Run npx skillmds@latest add ryan-brosas/prefect-foundation in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Prefect Foundation safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Prefect Foundation?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Prefect Foundation free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Prefect Foundation?

ryan-brosas (@ryan-brosas) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Prefect Foundation by ryan-brosas — Agent Skill

Name: Prefect Foundation
Author: ryan-brosas

Prefect Foundation

Use when building or porting workflow engines - heartbeat liveness past blocked loops, termination-intent dispatch, cancellation ownership across process boundaries, subflow reattach ladders, client-side retry/backoff arithmetic, transactional result caching, crash taxonomies, and supervised-process exit contracts - plus fire-and-forget telemetry batching (singleton queue services on a global loop, byte-budget log upload, context-capturing event workers, websocket resend with checkpoint acks) and event-driven completion waiting (subscriber replay backfill windows, seen-id dedup, clean-vs-abnormal close policy, register-recheck waiter ladders, terminal-event fan-in singletons, heartbeat backoff loops), lossy-tolerant log-stream consumption, dual-stream queue fan-in with sentinel/straggler-drain termination, recency-cached lineage enrichment, and thread-keyed sync/async waiter primitives - capsule-v2 source maps with decisive excerpts and graph retrieval.

ryan-brosas e505234 39 files · 166.7 KB Updated Sep 17, 2026

File contents

prefect: workflow-engine foundations

Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is historical, revision-pinned evidence rather than timeless guidance. Current project source, tests, requirements, and runtime behavior outrank this projection and decide what ships.

Provenance and revision

Source record: prefect; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
Recorded revision: main@ce79dd3d6cfa2b7337265498210dbc4d25bcdc98.
Full provenance, coverage caveats, boundaries, and preserved evidence: references/index.md.

Topic map

Representative topics: Liveness; Termination plane; Resumability; Process boundary; Execution shells; Run records; Retry plane; State ledger.
Scope and retrieval questions: references/index.md#use-this-for.
Complete capsule chooser: references/index.md#load-the-matching-source-dump.
Detailed grouped map: references/index.md#capsule-map.
Source limitations and portability boundaries: references/index.md#boundaries.

Retrieval

Open the index, choose one capsule matching the active question, and load only that capsule. Revalidate its cited source and revision before relying on it. Do not bulk-load the inventory, treat historical claims as current truth, or apply this foundation as a procedure.

---name: prefect-foundationdescription: Use when building or porting workflow engines - heartbeat liveness past blocked loops, termination-intent dispatch, cancellation ownership across process boundaries, subflow reattach ladders, client-side retry/backoff arithmetic, transactional result caching, crash taxonomies, and supervised-process exit contracts - plus fire-and-forget telemetry batching (singleton queue services on a global loop, byte-budget log upload, context-capturing event workers, websocket resend with checkpoint acks) and event-driven completion waiting (subscriber replay backfill windows, seen-id dedup, clean-vs-abnormal close policy, register-recheck waiter ladders, terminal-event fan-in singletons, heartbeat backoff loops), lossy-tolerant log-stream consumption, dual-stream queue fan-in with sentinel/straggler-drain termination, recency-cached lineage enrichment, and thread-keyed sync/async waiter primitives - capsule-v2 source maps with decisive excerpts and graph retrieval.---# prefect: workflow-engine foundations## Foundation contractThis is a cold, source-specific foundation, not an operational procedure. It ishistorical, revision-pinned evidence rather than timeless guidance. Currentproject source, tests, requirements, and runtime behavior outrank thisprojection and decide what ships.## Provenance and revision- Source record: `prefect`; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.- Recorded revision: `main@ce79dd3d6cfa2b7337265498210dbc4d25bcdc98`.- Full provenance, coverage caveats, boundaries, and preserved evidence: `references/index.md`.## Topic map- Representative topics: Liveness; Termination plane; Resumability; Process boundary; Execution shells; Run records; Retry plane; State ledger.- Scope and retrieval questions: `references/index.md#use-this-for`.- Complete capsule chooser: `references/index.md#load-the-matching-source-dump`.- Detailed grouped map: `references/index.md#capsule-map`.- Source limitations and portability boundaries: `references/index.md#boundaries`.## RetrievalOpen the index, choose one capsule matching the active question, and load onlythat capsule. Revalidate its cited source and revision before relying on it. Donot bulk-load the inventory, treat historical claims as current truth, or applythis foundation as a procedure.

Frequently asked questions