alacritty/alacritty

Can another program use it through a documented, machine-readable surface?

• next: [cli] L1 Invocable non-interactively: no prompts, or prompts guarded by a TTY check or a --yes/--no-input option. (prompts without a non-TTY guard: alacritty_terminal/src/term/mod.rs)
• next: [library] L4 An API reference is generated from the code (autodoc, mkdocstrings, typedoc, …). (no generated API reference)

cli ladder · level 0

• ✗ L1 Invocable non-interactively: no prompts, or prompts guarded by a TTY check or a --yes/--no-input option. prompts without a non-TTY guard: alacritty_terminal/src/term/mod.rs
• ✓ L2 --help documents every option (at least 90% of options have help text). alacritty/src/cli.rs 39 matches
• ✗ L3 Machine-readable output (--json/--format) and documented exit statuses. no --json/--format option
• ✗ L4 The output format is specified by a JSON Schema. no JSON Schema for the output

library ladder · level 3

• ✓ L1 An importable, packaged API exists. alacritty_config/src/lib.rs Rust library cratealacritty_config_derive/src/lib.rs Rust library crate
• ✓ L2 The public API is delimited (__all__, an exports map, exported identifiers). alacritty_config/src/lib.rs pub itemsalacritty_config_derive/src/lib.rs pub items
• ✓ L3 The public API is statically typed (py.typed, type declarations, a typed language). alacritty_config/src/lib.rs statically typed languagealacritty_config_derive/src/lib.rs statically typed language
• ✗ L4 An API reference is generated from the code (autodoc, mkdocstrings, typedoc, …). no generated API reference

Can integrators rely on it not changing under them?

• next: L3 A deprecation mechanism is used in code (warnings, @deprecated, Deprecation/Sunset headers) or the API is versioned. (no deprecation mechanism or API versioning)

all ladder · level 2

• ✓ L1 Releases are versioned (semver tags or versioned changelog sections). 112 semver tags, latest v0.17.0
• ✓ L2 A changelog exists and marks breaking changes. CHANGELOG.md marks breaking changes
• ✗ L3 A deprecation mechanism is used in code (warnings, @deprecated, Deprecation/Sunset headers) or the API is versioned. no deprecation mechanism or API versioning
• ✓ L4 Across tagged releases, no OpenAPI operation, CLI option or __all__ symbol was removed without first being deprecated. 20 tagged releases compared

Can others react to state changes without polling?

Can a machine act with its own revocable, least-privilege identity?

• next: [cli] L4 Several profiles or scoped credentials per target. (no credential profiles)
• next: [library] L4 Several profiles or scoped credentials per target. (no credential profiles)

cli ladder · level 3

• ✓ L1 Credentials can be supplied non-interactively (environment variables). alacritty/src/main.rs 1 match
• ✓ L2 Credentials never need to be on the command line, and their environment variables are documented. alacritty_terminal/CHANGELOG.md 1 match
• ✓ L3 No output or log statement includes a credential. no credential in print/log statements
• ✗ L4 Several profiles or scoped credentials per target. no credential profiles

library ladder · level 3

• ✓ L1 Credentials can be supplied non-interactively (environment variables). alacritty/src/main.rs 1 match
• ✓ L2 The credential environment variables are documented. alacritty_terminal/CHANGELOG.md 1 match
• ✓ L3 No output or log statement includes a credential. no credential in print/log statements
• ✗ L4 Several profiles or scoped credentials per target. no credential profiles

Can its data get in and out, in bulk, in open formats, with an explicit schema?

Can an automated caller use it without guessing, and recover from failure?

• next: [cli] L1 Never blocks on a prompt when stdin is not a TTY. (prompts without a non-TTY guard: alacritty_terminal/src/term/mod.rs)
• next: [library] L1 Errors are specific exception types, and library code never calls sys.exit. (library code exits the process: alacritty/src/migrate/mod.rs, alacritty_terminal/src/tty/unix.rs)

cli ladder · level 0

• ✗ L1 Never blocks on a prompt when stdin is not a TTY. prompts without a non-TTY guard: alacritty_terminal/src/term/mod.rs
• ✓ L2 Data on stdout, diagnostics on stderr, non-zero exit on failure. alacritty/src/migrate/mod.rs 6 matchesalacritty/src/cli.rs 1 match
• ✗ L3 Documented exit statuses distinguish error classes, errors are JSON in JSON mode, and color is off when not a TTY. exit statuses aren't documented
• ✗ L4 --dry-run, limits for long or costly operations (timeouts, budgets), and agent docs. no timeout/budget options

library ladder · level 0

• ✗ L1 Errors are specific exception types, and library code never calls sys.exit. library code exits the process: alacritty/src/migrate/mod.rs, alacritty_terminal/src/tty/unix.rs
• ✗ L2 Inputs are validated with messages naming the bad argument. no input validation errors
• ✗ L3 Timeouts and retries are configurable. no retry parameter
• ✗ L4 Agent docs, and examples that run as tests (doctests). no agent docs

Can another system run and compose it without a human?

• next: [cli] L3 Published to a public registry and run non-interactively in CI. (not published to a registry)
• next: [library] L3 Published to a public registry, with at most 10 runtime dependencies. (not published to a registry)

cli ladder · level 2

• ✓ L1 Runnable from source (a declared entry point). alacritty/src/main.rs cargo binary
• ✓ L2 Installable as a package that provides the command. alacritty/src/main.rs cargo binary
• ✗ L3 Published to a public registry and run non-interactively in CI. not published to a registry
• ✗ L4 Also shipped as a container image or a single binary. no container image or binary

library ladder · level 2

• ✓ L1 Importable from source. alacritty_config/src/lib.rs Rust library cratealacritty_config_derive/src/lib.rs Rust library crate
• ✓ L2 Installable as a package (a package manifest). alacritty_config/src/lib.rs package manifestalacritty_config_derive/src/lib.rs package manifest
• ✗ L3 Published to a public registry, with at most 10 runtime dependencies. not published to a registry
• ✓ L4 Optional features behind extras/features. alacritty/Cargo.toml 1 matchalacritty_terminal/Cargo.toml 1 match

Can behaviour be added without modifying the code?

• next: L1 Internal seams: a registry, registration function or plugin manager. (no registry or registration function)

all ladder · level 0

• ✗ L1 Internal seams: a registry, registration function or plugin manager. no registry or registration function
• ✗ L2 The docs show how to add behaviour through those seams (even in-tree). no registration functions to document
• ✗ L3 Out-of-tree extensions are discovered (entry points, a plugin directory, configuration) without editing the package. extensions must be added inside the package
• ✗ L4 The extension API is versioned, has lifecycle hooks, and has example extensions. the extension API isn't versioned

Can an operator, or an orchestrating agent, tell whether it works and why not?

• next: [cli] L2 Verbosity control for diagnostics (--quiet, --log-level, --debug). (no --quiet or log-level control)
• next: [library] L2 Log levels are used meaningfully (at least two levels). (fewer than two log levels used)

cli ladder · level 1

• ✓ L1 Meaningful exit statuses, and errors on stderr. alacritty/src/migrate/mod.rs 6 matchesalacritty/src/cli.rs 1 match
• ✗ L2 Verbosity control for diagnostics (--quiet, --log-level, --debug). no --quiet or log-level control
• ✗ L3 Structured logs (e.g. --log-format json) or a machine-readable run summary. no structured diagnostics
• ✗ L4 Tracing hooks (OpenTelemetry). no tracing hooks

library ladder · level 1

• ✓ L1 Logs through a standard logger namespace and never prints from library code. alacritty/src/display/window.rs 2 matchesalacritty/src/main.rs 2 matches
• ✗ L2 Log levels are used meaningfully (at least two levels). fewer than two log levels used
• ✗ L3 Optional metrics or tracing hooks. no metrics or tracing hooks
• ✗ L4 OpenTelemetry instrumentation available. no OpenTelemetry instrumentation

Can an agent change it safely with limited context?

• next: L3 At least 90% of modules fit 32k tokens and no file exceeds 12k; test/source token ratio at least 0.3; at least 70% of the code is typed. (80% of modules fit 32k tokens; 5 files over 12k; test/source token ratio 0.01 < 0.3)

all ladder · level 2

• ✓ L1 A README and some tests. README.mdalacritty_config_derive/tests/config.rs 2 test files
• ✓ L2 CI runs the tests; applications pin dependencies (libraries and zero-dependency projects are exempt). .github/workflows/ci.yml.github/workflows/release.yml
• ✗ L3 At least 90% of modules fit 32k tokens and no file exceeds 12k; test/source token ratio at least 0.3; at least 70% of the code is typed. 80% of modules fit 32k tokens; 5 files over 12k; test/source token ratio 0.01 < 0.3
• ✗ L4 No import cycles, and agent docs (AGENTS.md, CLAUDE.md, llms.txt). no agent docs (AGENTS.md, CLAUDE.md, llms.txt)