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examples/extensions/scratchpad: real .ts (not .js) extension, no
build step, no SDK. Runs via `npx --yes tsx index.ts` so authors
can use TypeScript without forcing a global install. Demonstrates:
/note <text> slash command (typed CommandResponse)
/notes slash command (display action)
/clear-notes slash command
read_notes LLM-callable tool (typed ToolResult)
Plus a typed wire-format subset inline so the file shows what the
protocol actually looks like from the consumer side. Pure node +
tsx, zero npm deps beyond tsx itself (~5 MB cached on first call).
Manager fix: extension exec paths are now resolved by shape:
absolute used as-is
starts with ./ or ../ joined to ext.Dir
contains a separator joined to ext.Dir (other relative form)
bare name (no sep) left as-is so $PATH lookup works
Before this, "exec": "npx" was being looked up at
extensions/scratchpad/npx and failing with a "no such file or
directory" error. With the fix, "node", "npx", "python3", "tsx",
etc. resolve via $PATH like users intuitively expect.
Bumped WaitForReady grace from 500ms to 3s so slow runtimes
(npx tsx cold-start ≈ 1.4s) get their register_tool frames
in before the agent's tool registry is built. Extensions that
send ready quickly still release the wait immediately; the
extra grace only applies to laggards.
Verified end-to-end live against anthropic:
prompt: "Use the read_notes tool now and tell me what's in the
scratchpad"
-> [tool_call] read_notes({})
-> [tool_result] (scratchpad is empty)
-> "The scratchpad is empty."
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