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BoundaryML
baml
Rust2024–2026
BoundaryML / baml

baml

The programming language for agents

12Distinct people
24Mentions
0Explicit recommenders
9.5KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

The programming language for agents

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 1:49:46 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by month24 dated mentions

Observed mentions: 2024-03-26 13:09:31 UTC to 2026-07-15 22:23:38 UTC.

01232024-03-01 00:00:00 UTC to 2024-04-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 commentsMar 20242024-04-01 00:00:00 UTC to 2024-05-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-05-01 00:00:00 UTC to 2024-06-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-06-01 00:00:00 UTC to 2024-07-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2024-07-01 00:00:00 UTC to 2024-08-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-08-01 00:00:00 UTC to 2024-09-01 00:00:00 UTC (exclusive): 3 mentions; 1 submissions, 2 comments2024-09-01 00:00:00 UTC to 2024-10-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2024-10-01 00:00:00 UTC to 2024-11-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-11-01 00:00:00 UTC to 2024-12-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments2024-12-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-01-01 00:00:00 UTC to 2025-02-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2025-02-01 00:00:00 UTC to 2025-03-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2025-03-01 00:00:00 UTC to 2025-04-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-04-01 00:00:00 UTC to 2025-05-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-05-01 00:00:00 UTC to 2025-06-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 commentsMay 20252025-06-01 00:00:00 UTC to 2025-07-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2025-07-01 00:00:00 UTC to 2025-08-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments2025-08-01 00:00:00 UTC to 2025-09-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-09-01 00:00:00 UTC to 2025-10-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-10-01 00:00:00 UTC to 2025-11-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-11-01 00:00:00 UTC to 2025-12-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2025-12-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-01-01 00:00:00 UTC to 2026-02-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-02-01 00:00:00 UTC to 2026-03-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-03-01 00:00:00 UTC to 2026-04-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-04-01 00:00:00 UTC to 2026-05-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-05-01 00:00:00 UTC to 2026-06-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2026-06-01 00:00:00 UTC to 2026-07-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-07-01 00:00:00 UTC to 2026-08-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 commentsJul 2026

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
Mar 20242024-03-01 00:00:00 UTC2024-04-01 00:00:00 UTC110
Apr 20242024-04-01 00:00:00 UTC2024-05-01 00:00:00 UTC000
May 20242024-05-01 00:00:00 UTC2024-06-01 00:00:00 UTC000
Jun 20242024-06-01 00:00:00 UTC2024-07-01 00:00:00 UTC202
Jul 20242024-07-01 00:00:00 UTC2024-08-01 00:00:00 UTC000
Aug 20242024-08-01 00:00:00 UTC2024-09-01 00:00:00 UTC312
Sep 20242024-09-01 00:00:00 UTC2024-10-01 00:00:00 UTC202
Oct 20242024-10-01 00:00:00 UTC2024-11-01 00:00:00 UTC000
Nov 20242024-11-01 00:00:00 UTC2024-12-01 00:00:00 UTC110
Dec 20242024-12-01 00:00:00 UTC2025-01-01 00:00:00 UTC101
Jan 20252025-01-01 00:00:00 UTC2025-02-01 00:00:00 UTC211
Feb 20252025-02-01 00:00:00 UTC2025-03-01 00:00:00 UTC202
Mar 20252025-03-01 00:00:00 UTC2025-04-01 00:00:00 UTC000
Apr 20252025-04-01 00:00:00 UTC2025-05-01 00:00:00 UTC101
May 20252025-05-01 00:00:00 UTC2025-06-01 00:00:00 UTC000
Jun 20252025-06-01 00:00:00 UTC2025-07-01 00:00:00 UTC202
Jul 20252025-07-01 00:00:00 UTC2025-08-01 00:00:00 UTC110
Aug 20252025-08-01 00:00:00 UTC2025-09-01 00:00:00 UTC101
Sep 20252025-09-01 00:00:00 UTC2025-10-01 00:00:00 UTC000
Oct 20252025-10-01 00:00:00 UTC2025-11-01 00:00:00 UTC101
Nov 20252025-11-01 00:00:00 UTC2025-12-01 00:00:00 UTC202
Dec 20252025-12-01 00:00:00 UTC2026-01-01 00:00:00 UTC000
Jan 20262026-01-01 00:00:00 UTC2026-02-01 00:00:00 UTC000
Feb 20262026-02-01 00:00:00 UTC2026-03-01 00:00:00 UTC000
Mar 20262026-03-01 00:00:00 UTC2026-04-01 00:00:00 UTC000
Apr 20262026-04-01 00:00:00 UTC2026-05-01 00:00:00 UTC000
May 20262026-05-01 00:00:00 UTC2026-06-01 00:00:00 UTC101
Jun 20262026-06-01 00:00:00 UTC2026-07-01 00:00:00 UTC000
Jul 20262026-07-01 00:00:00 UTC2026-08-01 00:00:00 UTC110

What Hacker News says

24 sources
We are working on making our programming language BAML turing-complete. https://github.com/boundaryml/baml It is a language that is embeddable in other programming languages, with the type system similar to typescript, and a runtime that is similar to Go. People use it currently for structured outputs with llms but soon we will support orchestration and more. We are letting some users have an early access preview! Let me know if you are interested in hacking with it!
In Ask HN: What are you working on? (May 2026)
Boundary (YC W23) | Software engineer (compilers) | Seattle, USA (in person) | Full-time We are building a new programming language (BAML) to build AI agents -- the "typescript" for LLMs. We are open source: https://github.com/BoundaryML/baml A big part of this language is all the tooling around visualizing non-deterministic code, visualizing code, and getting great observability (e.g. our language has type information at runtime unlike TS). We are looking for engineers with experience with Rust, programming languages, and/or compilers. Any amount of experience is fine. To apply: send an email to aaron@boundaryml.com with your resume and mention you came from HN
In Ask HN: Who is hiring? (November 2025)
Super cool! We at BAML had been thinking about doing something like this for our ecosystem as well - we’d love to add BAML models to this repo! If you haven’t heard of us, we provide a language and runtime that enable defining your schemas in a simpler syntax, and allow usage with _any_ model, not just those that implement tool calling or json mode, by by relying on schema-aligned parsing. Check it out! https://github.com/BoundaryML/baml
In Run structured extraction on documents/images locally with Ollama and Pydantic
aaronvg·Jan 27, 2025Submission

Show HN: Structured Outputs with Deepseek R1

This is our interactive playground that uses our framework (BAML https://github.com/BoundaryML/baml) to do structured outputs with R1, without the use of tool-calling APIs or fine-tuning required. We have a more fleshed out playground at https://promptfiddle.com as well. BAML is a DSL for prompts, where prompts are modeled as functions. Our compiler transforms your LLM function declaration into the relevant API call, and will also parse the output for you. We serialize using "type definitions" instead of using json schemas, since they are more efficient and easier to understand for models. We talk more about why here: https://www.boundaryml.com/blog/type-definition-prompting-ba... We ran the Berkeley Function Calling Benchmark some months ago on our approach and achieved really good results https://www.boundaryml.com/blog/sota-function-ca
Read the rest
7 points · Open discussion
I found it interesting how DSPy created the Signatures concept: https://dspy.ai/learn/programming/signatures/ We took this kind of concept all the way to making a DSL called BAML, where prompts look like literal functions, with input and output types. Playground link here https://www.promptfiddle.com/ https://github.com/BoundaryML/baml (tried pasting code but the formatting is completely off here, sorry). We think we could run some optimizers on this as well in the future! We'll definitely use DSPy as inspiration!
In DSPy – Programming–not prompting–LMs

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