How to pronounce BAML

BAML is most commonly pronounced "bam uhl" (/ˈbæməl/). This is one of several readings in active use; the developer community hasn't converged on a single answer.

BAML is Boundary's (YC) open-source domain-specific language for writing type-safe LLM/agent prompts; .baml files declare typed prompt functions callable from any language. The README's own gloss is the joke "Basically A Made-up Language"; it is also widely reported to have originated as "Boundary AI Markup Language," paralleling YAML. Built on the -ML markup-language lineage, so the natural one-word reading is "bammel" /ˈbæməl/ — first-syllable stress, rhyming with camel, exactly like YAML→"yammel" / SAML→"sammel." No official pronunciation guide exists and many first-time readers instead spell it out B-A-M-L (alt), so it is genuinely split. Non-obvious because the four consonant-heavy letters give no cue that a vowel sits between the M and L; non-native devs also tend to over-articulate the trailing -L.

Alternate readings you might hear:

• "bee ay em el" /ˌbiːˌeɪˌɛmˈɛl/

Source: BoundaryML/baml — GitHub README

Pronouncing project and product names correctly avoids the small but persistent friction of being gently corrected during standups, conference Q&As, and team calls. Hearing the word a few times locks in the right reading better than reading IPA ever will. Pronounce is a community-maintained dictionary — every entry tagged with a confidence level and (where possible) a citable source.