send_test_post: a built-in welcome post for newly connected agents#208
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…ents A newly connected agent's first post is the user's first impression, and leaving it to the agent to improvise is a quality lottery. send_test_post makes it deterministic: one no-arg call publishes a fixed card — shipped and versioned with sideshow, themed for light/dark — that confirms the connection works and hands the user example prompts that reliably produce real posts. All three tiers: the send_test_post MCP tool (streamable HTTP + stdio), POST /api/test-post, and `sideshow test-post`. One shared implementation (server/welcomePost.ts). Idempotent — the existing welcome card is returned (alreadySent: true), never duplicated; a user who deleted or retitled theirs gets a fresh one, matching intent. The card lives in its own "Getting started" session so task sessions stay about the task. The MCP initialize instructions nudge freshly connected agents toward it. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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What
A new no-arg tool that publishes sideshow's built-in welcome/test post — fixed content shipped and versioned with sideshow — so a newly connected agent's first post is deterministic instead of improvised. The card confirms the connection is live, shows the four card families at a glance, and gives the user five example prompts that reliably produce real posts.
Available on all three tiers, one shared implementation (
server/welcomePost.ts):send_test_posttoolPOST /api/test-post(optional{agent}body)sideshow test-post [--agent <name>]Behavior
alreadySent: true(matched by the fixed title; a user who deleted/retitled theirs gets a fresh one, which matches intent).htmlsurface styled entirely from the theme variables (light/dark safe).guide/AGENT_HOWTO.mddocuments it for the CLI/HTTP tiers.Why fixed content
The first post is the user's first impression of the whole product; agent-improvised hello cards are a quality lottery. Fixed content also doubles as user onboarding — the card's prompt list gives the user words that reliably trigger good agent output.
Tests
test/welcomePost.test.ts: REST publish + idempotency (incl. body-less curl), fixed title/session assertions, MCP tools/list + tools/call round trip + cross-tier idempotency (MCP-published card visible to REST), and the auth gate. Full suite 424/424; lint/typecheck clean.Verified live: served the branch, ran
sideshow test-posttwice (publish, thenalreadySent), confirmed the initialize nudge on/mcp.Hosted-sideshow note
sideshow-cloud picks this up with a plain pin bump — the tool flows through the existing
createAppwrapping unchanged.🤖 Generated with Claude Code