args

Language reference / args

Meaning and placement

invoke

Arguments passed to the tool · an object whose shape is the TOOL’s own schema, not the language’s. Each builtin and each MCP tool declares its own (spec/02-verbs.md §invoke) · ${{ }} may appear in any leaf value.

Property	Declaration
Requirement	Optional in this object
Schema location	`/$defs/invoke/properties/args`
type	”object”

In the same object: tool · workflow Schema source (use the pointer above)

In a source template

Excerpt from templates/agent-loop.nika.yaml, source lines 138–147. This is a fragment, not a runnable workflow.

illustration

      has_findings: ${{ size(tasks.execute.output.findings) > 0 }}   # the check crosses as ONE boundary expression · SLOT: your law
    invoke:
      tool: "nika:assert"
      args:
        condition: "${{ with.has_findings }}"
        message: "Agent returned no findings, do not trust an empty run"   # SLOT

outputs:
  findings:
    value: ${{ tasks.execute.output.findings }}

Templates containing this field

Template	Source
`templates/agent-loop.nika.yaml`	Line 141
`templates/api-upload-and-create.nika.yaml`	Line 71
`templates/chain.nika.yaml`	Line 49
`templates/classify-and-route.nika.yaml`	Line 97
`templates/corpus-qa.nika.yaml`	Line 35
`templates/docker-report.nika.yaml`	Line 93
`templates/document-to-fields.nika.yaml`	Line 41
`templates/etl-state.nika.yaml`	Line 73
`templates/fanout.nika.yaml`	Line 89
`templates/gate-and-act.nika.yaml`	Line 54
`templates/human-gated-ship.nika.yaml`	Line 96
`templates/media-asset-pack.nika.yaml`	Line 74
`templates/website-brief.nika.yaml`	Line 53

These are literal key occurrences in the source files, not an execution or conformance claim. How to instantiate a template.

Contract and implementation

This page projects the named specification revision. Check released engine status and the validation workflow before running a file. An optional field is not evidence that every engine supports every value. Canonical identity: language:word:args. Spec revision: c5ebbb7b862b. How documentation stays connected.

YAML

Language fields

CLI & errors

Data catalogs

Workspace

Documentation system

Tool contracts

Meaning and placement

invoke

In a source template

Templates containing this field

Contract and implementation

​Meaning and placement

​invoke

​In a source template

​Templates containing this field

​Contract and implementation

Meaning and placement

invoke

In a source template

Templates containing this field

Contract and implementation