reply command sends addressed fields as JSON arrays instead of comma-separated strings, causing 422 or drafts

[jaxson]

Bug Description

The hey reply command fails with a 422 Unprocessable Content error (or silently creates a draft instead of sending) because the SDK's CreateReply method in hey-sdk/go v0.3.0 sends the addressed fields (directly, copied, blindcopied) as JSON arrays (["email@example.com"]) instead of comma-separated strings ("email@example.com").

Steps to Reproduce

1. hey reply <topic_id> -m "test"
2. Observe 422 response from POST /entries/{id}/replies.json

Root Cause

In hey-sdk/go@v0.3.0/pkg/hey/entries.go, the CreateReply method (lines 74-88) assigns []string slices directly to the addressed map:

addressed["directly"] = to    // []string{"alice@example.com"}

But the HEY API's MessageAddressed type (in the generated OpenAPI types) defines these as comma-separated strings:

type MessageAddressed struct {
    Directly    string `json:"directly,omitempty"`
    Copied      string `json:"copied,omitempty"`
    Blindcopied string `json:"blindcopied,omitempty"`
}

Additionally, without the addressed block, the API creates a draft instead of sending.

Workaround

Bypass CreateReply in the CLI and call PostMutation directly with strings.Join(emails, ", ") for each addressed field.

Introduced In

Commit 6ce1992 ("Fix reply command to send instead of creating a draft") / SDK upgrade to v0.3.0.

[cpinto]

I'm really really sorry that I broke this for you. I don't understand how/why it works for me - I have the CLI/SDK exposed to my Claude desktop as an MCP. Regardless, I'm trying to produce a fix and will propose an SDK PR shortly.

[jaxson]

No worries at all I'm excited that it's in development! Thanks for already doing a PR. How might I expose the CLI to my Claude desktop?

[cpinto]

No worries at all I'm excited that it's in development! Thanks for already doing a PR. How might I expose the CLI to my Claude desktop?

@jaxson published the repo now https://github.com/cpinto/hey-mcp, it could probably get away with just the skill. it's not doing anything tricky, just wrapping the CLI

[jaxson]

Thanks @cpinto