Zero Zero is an agent first programming language. zero.graph is the program; .0 files are projections of it. Edit through zero patch . Install this skill once in an agent's skill manager. Keep it thin; Zero's own CLI serves the version matched workflow for each installed compiler. Use the zero already on PATH or at ~/.zero/bin/zero when one exists; environments often pin a specific compiler, and replacing it silently breaks version matched stores and workflows. Install only when zero is missing: Version Matched Skills This file is only a discovery stub. Do not treat it as the full Zero workflow or as command reference. Before editing, checking, testing, or repairing Zero code, ask the installed compiler for the skill content that matches that exact binary: If the user has multiple Zero binaries, use the same binary that will run the project: Use zero skills get <name to load only what the task needs, and fetch each topic at most once per session: the content is fixed for a given compiler binary, so refetching a loaded topic returns the same text. Topics and approximate served sizes: zero (~2 KB): this discovery stub agent (~4 KB): read edit verify loop, zero query usage, edit surfaces, verification language (~6 KB): syntax, types, effects, control flow, generics graph (~9 KB): zero.graph store, query/view, patch operations, import/export/merge diagnostics (~4 KB): reading diagnostics, zero explain, typed fix plans packages (~5 KB): manifests, package layout, creation and repair builds (~5 KB): build/run, targets, profiles, emitted artifacts testing (~3 KB): test blocks, filters, runtime checks stdlib (~39 KB): full signature reference, including ready made validators: std.time (RFC 3339 incl. the exact leap second rule), std.inet (IPv4/IPv6/hostname), std.regex (ECMA subset), std.unicode (strict UTF 8). Check here before hand writing any parsing or validation logic. Fetch one module's section (~1 KB) with zero skills get stdlib topic <prefix , e.g. topic std.time . Before hand writing any parsing or validation, check the stdlib catalog: zero skills get stdlib topic <module serves one section ( std.time covers RFC 3339 incl. leap seconds). Edit through the graph: zero patch covers everything from surgical in function text edits ( replace in fn <fn old <text new <text , Edit semantics) to complete helper creation ( upsertFunction ... end ) and whole function bodies ( replace fn <fn body file with a heredoc). Direct .0 text edits are a last resort for changes no patch op expresses; package commands refresh zero.graph from edited source, but patch keeps the loop faster and preserves node identity. Read one function with zero view fn <name instead of whole files. Prefer concise text output during interactive agent work; use json only for automation, exact spans, contracts, or machine readable diagnostics. Common Entry Points In a Zero repository checkout, prefer bin/zero when the task is about that checkout rather than the globally installed compiler.