put_v1_pubsub_jetstream_streams_stream

UpdateStream rewrites a stream's configuration — subjects, limits, discard — and returns the updated stream. It is a PUT: the spec sent replaces the spec held, with one reading for the enums a caller omits — an empty storage, retention or discard keeps the stream's current one, because JetStream holds storage and retention immutable and refuses a change with a 400 rather than this door pretending it took.

Arguments

This tool's schema does not declare which fields are required, nor any default, nor any enumerated value set. The columns above are empty because the door publishes nothing there, not because the answer is "none" — where a field is constrained, the constraint is stated in that field's own description.

Call it

A tools/call carries every argument in one flat object — nothing binds to a path or a query string. Every declared argument is shown, because the door marks none of them required.

curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "put_v1_pubsub_jetstream_streams_stream",
         "arguments": {
           "discard": "<discard>",
           "maxAge": 0,
           "maxBytes": 0,
           "maxMsgs": 0,
           "retention": "<retention>",
           "storage": "<storage>",
           "stream": "<stream>",
           "subjects": [
             "<subjects>"
           ]
         }
       }
     }'

Values are placeholders derived from each field's declared type. tools/list needs no credential; tools/call does — called without one the door answers HTTP 200 with a JSON-RPC result whose isError is set and whose text says what was missing. How to get a key →

The operation behind it

The same capability over plain HTTP is in the cloud API reference, on https://api.hanzo.ai.

All 834 tools · The door · API reference

Generated from tools/list on https://api.hanzo.ai/v1/mcp — 834 tools captured 2026-08-01 (this build read the vendored copy; the door was unreachable).