Building a Tool-Calling Runtime in 300 Lines

Proposed by Tobias Andersson · Rivergate OSS

Accepted

Decision

Currently accepted. You can change your mind at any time.

A session exists on the agenda for this proposal — 13 May 2027 at 18:00.

Proposal

Live-coded from an empty file: a minimal, debuggable tool-calling loop with cancellation, tracing and a sandbox, and what each abstraction buys you.

Agents & ToolingWorkshopIntermediate

Open Source

DevEx

Speaker

People attached to this proposal. Accepting copies them onto the session and assigns their onboarding tasks.

Tobias AnderssonSpeakerPrimary contact

Developer Advocate, Rivergate OSStobias.andersson@example.com

Tobias maintains three open-source agent libraries and one very long changelog. He cares about docs more than demos.

Application answers

Everything the speaker filled in on the call-for-papers form.

Talk title: Building a Tool-Calling Runtime in 300 Lines
Abstract: Live-coded from an empty file: a minimal, debuggable tool-calling loop with cancellation, tracing and a sandbox, and what each abstraction buys you.
Track(s): Agents & Tooling
Session format: Workshop (90 min)
Audience level: Intermediate
Have you presented this talk before?: Yes
Where and when did you present it, and what changed since?: Presented an earlier version at a regional meetup last autumn. This version adds nine months of production data and drops the speculative section.
Do you need travel support to attend?: Yes
Speaker biography: Tobias maintains three open-source agent libraries and one very long changelog. He cares about docs more than demos.

Reviewers

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Reviews

1 review from the programme committee.

5.0 / 5average from 1 score

Tomas Kalb5.0 / 5Approve28 Jul 2026
Strong submission. The outline is specific enough that I trust the speaker can land it in the time slot.

Details

FormatWorkshop

Audience levelIntermediate

Submitted21 Jun 2026 at 22:30

Decision recorded27 Jul 2026 at 22:30

FormDevFlow Conf 2027 — Call for Speakers