the standard library

nika:write

Write a file · returns the path. overwrite defaults true · create_dirs defaults false. One of 28 builtins in the closed nika: namespace: workspace files: read, write, search (permits.fs-gated).

filefamily5 tools
4argsdeclared contract
2requiredcheck teaches a miss
5skeletonsship this tool

the contract

4 args · 2 required

A missing required arg is a nika check finding before anything runs; the vocabulary below comes from the binary itself (nika catalog --tools --json), not from prose.

path*: stringdestination path
content*: stringthe content to write
overwrite: boolean
create_dirs: boolean

in a real file

from the chain skeleton

chain.nika.yaml

34  persist:35    with:36      think: ${{ tasks.think.output }}37    ◆invoke:38      tool: "nika:write"39      args:40        path: "./output.md"         # SLOT: destination41        content: "${{ with.think }}"   # ALWAYS pass content · a write without it writes nothing

a verbatim excerpt, real line numbers from chain.nika.yaml, conformance-gated upstream on every spec push. open the full skeleton →

cross-references

ships in skeletons

the check gates

NIKA-BUILTIN-001

[{"slug":"the-mcp-server-you-didnt-build","title":"The MCP server you didn't have to build","date":"2026-07-11"},{"slug":"injection-goes-nowhere","title":"The prompt injection that goes nowhere","date":"2026-07-08"}]

from the blog

where it lives

the file family

5 tools

workspace files: read, write, search (permits.fs-gated).

Machines read the same vocabulary at /tools/catalog.json; the contract lives in spec 06 · stdlib. Install and ask the binary itself: nika catalog --tools. Read the spec →