The POSIX agent-hook script for every curl-based agent inlined the full
event payload via `curl --data-urlencode "payload=${payload}"`. Tool
output can be tens of KB, so the resulting process command line could be
multi-KB — which endpoint security tools (e.g. Microsoft Defender for
Endpoint) flag as an oversized/suspicious command line. That produced a
false-positive detection on Orca's own loopback (127.0.0.1) telemetry POST.
Stream the payload to an mktemp file and post it with
`--data-urlencode "payload@$payload_file"` instead. The urlencoded body on
the wire is byte-identical, so the agent-hook receiver is unchanged; the
payload simply never appears on a process command line. `trap ... EXIT`
removes the temp file on every exit path. Small bounded metadata fields
(paneKey/tabId/worktreeId/env/version) stay inline.
Applied to all curl-based agents: claude, codex, command-code, copilot,
cursor, droid, gemini, grok, antigravity. (amp/hermes/opencode post via
the HTTP request body and were never affected.) The Windows post-command
shares the same latent pattern and is flagged as follow-up.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Neil <4138956+nwparker@users.noreply.github.com>
Co-authored-by: Orca <help@stably.ai>
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