HTTP-Invoked Functions

Use this pattern when iii should call external HTTP endpoints as functions.

Pattern selection rules

• If the task says "register HTTP endpoints with registerFunction", use this pattern.
• If the task asks for an endpoint list/map (for example { path, id }) and a loop over registerFunction, use this pattern.
• If the system being adapted cannot be modified, use this pattern.
• If the goal is exposing inbound routes that iii owns, use registerTrigger({ type: 'http' }) instead.

Core model

• registerFunction(meta, HttpInvocationConfig) registers an outbound HTTP-invoked function.
• trigger({ function_id, payload }) invokes it like any other function.
• Trigger payload becomes request body for JSON-based calls.
• Non-2xx and network failures are treated as invocation failures.

Common shape

• registerWorker(url, { workerName })
• Small endpoint descriptor list, then loop registration:
  • [{ path, id }]
  • registerFunction({ id }, { url: base + path, method: 'POST' })
• Optional auth config with env var keys (token_key, secret_key, value_key)

Guardrails

• Do not model outbound HTTP endpoint adaptation as registerTrigger({ type: 'http' }).
• Do not pass raw secrets in auth fields; pass env var names.
• Keep function IDs stable and domain-prefixed (for example legacy::orders).

Reference

See ../references/http-invoked-functions.js.

Also available in Python: ../references/http-invoked-functions.py

Also available in Rust: ../references/http-invoked-functions.rs

When to Use

• Use this skill when the task is primarily about iii-http-invoked-functions in the iii engine.
• Triggers when the request directly asks for this pattern or an equivalent implementation.

Boundaries

• Never use this skill as a generic fallback for unrelated tasks.
• You must not apply this skill when a more specific iii skill is a better fit.
• Always verify environment and safety constraints before applying examples from this skill.