February 2026 performance: Focused on API extensibility, in-app analytics, and documentation quality to improve modeling workflows and reduce future maintenance costs across KittyCAD repos.

January 2026 monthly summary for KittyCAD engineering across modeling-app, modeling-api, and cli. The quarter started strong with broad feature delivery, API modernization, and reliability improvements, positioning the platform for richer modeling workflows and faster release cycles.

December 2025 focused on stabilizing core modeling workflows, expanding KCL capabilities, and delivering release-ready milestones across KittyCAD repos. The month combined core quality fixes with feature-rich enhancements and disciplined release engineering, enabling faster iterations for modeling teams and safer upgrade paths for customers.

Month: 2025-11 Concise monthly summary focused on delivering business value through robust core capabilities, improved developer tooling, and stable releases across KittyCAD repos. Highlights include significant KCL core advancements, enhanced LSP support, testing and docs improvements, and release engineering that elevates product quality and API stability. Key features delivered - KittyCAD/modeling-app: KCL Core: New formatter and parser with path discovery across modules and refactor to a named struct (highly improve cross-file formatting and maintainability). Commits include c1c5323fe76f999f9aaaa8a169cc8af239eb9e7c, 03beece0efe8a10690f377b51f97224c3742b633, and 4975ac3e1c6da33e168ed96360bbfa15ff3cc9a7. - KCL Core: Formatter and parser bug fixes to include module prefixes in formatted output and allow 'if' in pipelines, enhancing parsing/formatting reliability. - KCL LSP and autocomplete enhancements: Added argument-label completions and subtract2d autocomplete snippets to improve IDE support and developer efficiency. - KCL Testing, docs and examples: Implemented sim tests snapshot linter, lint all sim tests, and multi-target multi-tool subtract examples/docs, improving test coverage and documentation quality. - KCL Releases and dependency updates: Released KCL 107 and 110, and updated Kittycad API crate to stabilize API surface and compatibility. - KCL Misc bug fix: Circle position defaults to origin fixed for consistent geometry initialization. - KCL Config and behavior tweak: Use TWENTY_TWENTY=update rather than overwrite, ensuring safer configuration changes. - KCL: Expanded parser to accept comments in more places to improve parsing resilience. - KCL: Added a new 'factor' argument for scale operations to support flexible transformations. - KCL CI and API token handling improvements: CI now checks ZOO_API_TOKEN before tests and prefers ZOO_API_TOKEN over KITTYCAD_API_TOKEN when suggesting tokens. - KCL: Selective lint-and-fix workflow introduced to target issues more efficiently. - KCL: Default roughness set to 1 to align with visual expectations and improve rendering results. - KCL: Improved error messages for missing arguments to indicate the function involved, speeding debugging. - Rust toolchain bump: Upgraded to the latest stable Rust toolchain, aligning with project-wide tooling best practices. - KCL: Added examples for holes and involute gear functions to expand practical usage scenarios and docs. - KittyCAD/documentation: Zoo Design Studio improvements including a new Hole Tool, enhanced extrusion, and battery performance optimizations. - KittyCAD/modeling-api: OIT endpoints released to support order-independent transparency, with a dedicated API endpoint and related stability considerations. - KittyCAD/cli: Stability enhancements via dependency upgrades and streamlined release tooling (Makefile and unsigned tag releases). Overall impact and accomplishments - Substantial improvements to KCL core capabilities and reliability, enabling more maintainable code, safer transformations, and richer rendering features. - Enhanced developer experience through targeted LSP enhancements, linting/writing tests, clearer error messages, and better docs, accelerating onboarding and daily development. - Strong release discipline and API stability, with multiple major releases and API crate updates, reducing risk for downstream users and tooling. - Cross-repo collaborations delivered tangible business value: higher product quality, faster iteration cycles, and a more robust platform for 3D modeling and documentation. Technologies and skills demonstrated - Rust ecosystem and toolchain modernization (Rust toolchain bump; cargo-based releases). - Parser/formatter engineering, path discovery across modules, and data structure refactors (named structs). - LSP integration and IDE ergonomics (autocomplete, argument labels, snippets). - Testing, linting, docs, and example coverage (sim tests, multi-target/multi-tool docs). - Release engineering and package management (Cargo.toml, Makefile targets, token handling). - Rendering feature development (OIT endpoints) and 3D tooling improvements (hole tools, involute gear examples).

October 2025 monthly summary focusing on business value and technical achievements across KittyCAD repositories. Key features delivered: - KittyCAD/documentation: October 2025 Zoo Platform Upgrade delivering Geometric Dimensioning and Tolerancing (GD&T) annotations, UI support for pattern-based workflows, MCP server integration for AI capabilities, DXF export for 2D sketches, enhanced extrude with a 'to' parameter, and improved chamfer offsetting; includes bug fixes and UI/model tooling usability improvements. Commit: 9a4fedf8a7343f7064e9f7a3e8347ab81e2e49ae. - KittyCAD/modeling-app: KCL Hole Module for mechanical engineering (experimental hole functionality plus comprehensive docs and examples for blind holes, counterbores, and countersinks) with support for hole-parameter placement; plus KCL Execution & Simulation Stability improvements and Code Quality/Docs Infrastructure enhancements. Major bugs fixed: - Documentation: Fix inaccurate hole docs and updates to hole examples. - Hole checks: Move flat-bottom hole check to improve hole validation. - Simulation/tests: Expanded tests for multi-body/multi-target operations and stability; avoidance of stdlib noise in KCL execution; disabled a brittle test to stabilize the test suite. Overall impact and accomplishments: - Accelerated delivery of a feature-rich platform with AI-enabled capabilities and richer CAD workflows, improving design accuracy and reuse. - Significantly improved simulation robustness and reliability in KCL, reducing stack overflow risk and improving test coverage. - Strengthened developer productivity through tooling enhancements, linting, and documentation workflows, aligning docs with code. Technologies/skills demonstrated: - CAD platform features (GD&T, DXF export, advanced extrudes, chamfer offsetting, pattern-based UI) and AI integration (MCP server). - KCL language and tooling: hole module, iteration-based evaluation, simulation testing, and multi-body handling. - Code quality: Python bindings linting, docs cleanup, and automated docs generation improvements.

September 2025 monthly summary for KittyCAD repositories. Key features delivered: OpenAPI Schema Lifecycle and Validation in KittyCAD/modeling-api, including lint validation, a schema management crate with a regeneration command, and CI checks to detect breaking changes. Major bugs fixed: KittyCAD/modeling-app KCL documentation alt text now correctly references the top-level 'name' property, ensuring accurate rendering of demonstrated functions. Overall impact: strengthened API stability, clearer documentation, and faster, safer API evolution through repeatable tooling and CI. Technologies/skills demonstrated: OpenAPI tooling, Rust schema tooling, CI integration, Handlebars templating, and documentation templating.

August 2025: Drove stability and capability across KittyCAD repos by upgrading core modeling dependencies, expanding programmatic CAD workflows, enhancing visualization, and laying groundwork for advanced constraint solving. Delivered business value via automated CAD imports and previews, richer 3D visualization, and a scalable constraint solver foundation, while correcting geometry representation and aligning builds with stable Rust toolchains.

July 2025 performance and capability expansion across KittyCAD repos. Delivered advanced geometry tooling, API surface improvements, and stability enhancements that directly boost modeling speed, reliability, and scripting capabilities. Key releases refined geometry kernels and bindings, while CI and release processes improved developer throughput and reliability.

June 2025 achievements focused on reliability, performance, and API expansion across KittyCAD modeling-app and modeling-api. Key features include robust KCL error handling, parser/type UX enhancements, diameter support for involuteCircular, non-ASCII identifier support, coordinate grid alignment to user units, and optimization work. Major bugs fixed include clearer errors for self-referential variables, edge-case error handling, and WASM test and formatting issues; Rust toolchain upgraded. API expansion delivered: extrudeTwist endpoint and API alignment in modeling-cmds; modeling-api releases 0.2.123 and 0.2.125 enabling new extrusion behavior and optional origin field. The result is faster development cycles, improved reliability, and broader capabilities for customers and internal integrations.

May 2025: Across KittyCAD/modeling-app, KittyCAD/modeling-api, and KittyCAD/cli, delivered major KCL language enhancements, advanced geometry features, and solid release engineering. These changes expand expressiveness, improve reliability, and streamline onboarding, providing a stronger foundation for future features and business value.

April 2025: Focused on Kwargs-driven refactor of KCL usage, reliability improvements, and CI hygiene, while laying groundwork for 3D boolean operations in modeling-api. Delivered cross-repo keyword-argument standardization, bug fixes, snapshot updates, CI partitioning, and dependency/defaults maintenance, enabling safer releases and richer modeling capabilities.

March 2025 in KittyCAD/modeling-app focused on API modernization and developer experience. Delivered a keyword-argument refactor for the KCL Line Drawing API and substantially improved error reporting and validation across the parser, type checker, and runtime. The changes enhance API clarity, maintainability, and user/developer debugging experience, setting a foundation for reliable feature development and faster issue resolution.

February 2025 monthly summary for KittyCAD development across modeling-app, cli, kcl-samples, and modeling-api. Focus on delivering keyword-arguments refactors, release automation, stability improvements, and compatibility work that unlocks downstream integration and accelerates delivery of features. Highlights cover API clarity, documentation alignment, and a modernized tech stack.

2025-01 Monthly Summary for KittyCAD engineering team focusing on business value and technical achievements across modeling-app and modeling-api. Delivered features and optimizations that reduce maintenance overhead, improve feature readiness, and strengthen the modeling stack for future capabilities. Key outcomes include flexible KCL function declarations grammar, CI/CD simplifications, and API/type enhancements with clean dependency upgrades. Key achievements: - Flexible KCL Function Declarations Grammar: Enabled optional = and => in function declarations, validated with new tests. Commit: 9358278f7bd51e1a2b881f7f834a1b05b03c9fad (CM KCL: = and => are optional in fn declarations (#4941)). - CI/CD Benchmark Suite Reduction: Removed iai benchmark tests from the Rust project to streamline CI/CD and encourage alternative performance analysis tools. Commit: ac3f7ab712b3c4ba45b53e2c6bd2aeff24a4e1c8 (Rust: Remove iai benchmark tests (#5102)). - Modeling Commands API Enhancement: Implement PartialEq for ModelingCmd enum to enable equality comparisons and pave the way for future modeling command features. Commit: beb56fdd94b427784f3350c5672277c78d320a29 (Release modeling-cmds-macros-impl 0.1.13 (#712)). - Dependency Cleanup in Modeling API: Remove ts-rs workaround after upgrading to ts-rs 10.1.0 and release modeling-cmds 0.2.87, removing legacy compatibility code. Commit: a185d43a3b0912fff8ff6c8fa9fcba3a0ce664ab (Release modeling-cmds 0.2.87 (#715))).

December 2024: Delivered foundational keyword-argument support in KCL across the parser/AST stack, enabling keyword calls for user-defined and stdlib functions with defaults and labels, and support for unlabeled keyword arguments. Completed internal KCL refactor consolidating fields and fixing argument naming for easier maintenance. Removed the stdlib implemented in KCL to reduce duplication and maintenance burden. Strengthened release and testing readiness with CI/docs/test infra updates, including version bumps, derive-docs, and external-branch gating, and aligned engine/API snapshots. Addressed stability through targeted bug fixes (test breakage, keyword-arg syntax normalization, and snapshot updates) and introduced stdlib atan2 support and related cross-repo improvements across modeling-app, modeling-api, and cli.

November 2024 performance highlights across KittyCAD repos, focused on test reliability, core KCL refactors, and release readiness. Delivered substantial test-suite enhancements, core modeling-language improvements, and ecosystem-wide dependency upgrades to accelerate delivery cycles and improve reliability.

October 2024 monthly summary for KittyCAD engineering: - Delivered robust extrusion edge retrieval in the modeling-app module, refactoring edge queries to accept any valid edge ID, improving stability when path variants deviate from expectations. - Improved code quality, tests, and CI reliability, including enum-based TagEngineInfo tagging, CI docs improvements for Justfile, and new regression tests (poop chute geometry) to prevent regressions. - Released Modeling-CMDs Library 0.2.72 in the modeling-api module, extending API capabilities with new parameters/fields across commands.