fix(agentic): Antigravity adapter argv drops the prompt — --print swallows --print-timeout as its value

[rickylabs]

Summary

.llm/tools/agentic/runtime/adapters/antigravity-adapter.ts emitted:

agy --print --print-timeout <ms> ...

but agy's --print takes the prompt as its value. So --print swallowed the literal string
--print-timeout, and the real prompt was never passed. The agent received --print-timeout as its
instruction.

Owner-specified corrected form keeps all flags before the final --print and prompt value:

agy --model gemini-3.6-flash-high --output-format stream-json --dangerously-skip-permissions --new-project --print "<prompt>"

--print-timeout is deliberately omitted until its ordering is separately proven.

Observed

Reproduced during 0.0.4 release orchestration, 2026-08-03: the launched agent went off investigating
--print-timeout as though it were the task; a second attempt returned a bare greeting. No error —
the invocation was well-formed, it just meant something else.

Why this is p1 now

The documentation authoring lane was just repointed to Antigravity (#1082, PR #1086) because
agy runs on the owner's Google subscription rather than billing OpenRouter credit. Every future
docs slice therefore goes through this adapter.

It also silently degraded any Antigravity probe elsewhere — including the research_extraction
lane and agentic:antigravity-evidence — and the failure presented as "the model gave a useless
answer" rather than as a malformed command.

Acceptance

• The adapter emits --print last, with the prompt as its value, and never places another flag immediately after --print
• A test asserts the emitted argv passes the prompt as --print's value and that no flag follows --print
• An Antigravity probe returns a response that demonstrably answers the prompt, not the flag
• agentic:antigravity-evidence is re-verified against the corrected argv

Evidence

• PR fix(agentic): route Gemini docs through Antigravity #1086, slice commit 8621d4ce0
• Focused adapter/CLI/compat/volatile guards: 25 passed, 0 failed
• Full .llm/tools/agentic/ suite: 323 passed, 0 failed
• Live probe returned exactly the requested unique marker ANTIGRAVITY_PROMPT_VALUE_1089_OK
• agentic:antigravity-evidence: passed, exit 0, no diagnostics, headless and structured output supported, raw output not retained
• Separate Claude/Opus slice review: PASS, all eight criteria verified, no blocking findings

Provenance

Found by the PR-C docs supervisor while running the documentation lane, 2026-08-03. Reproduced twice.
Folded into PR #1086 by written owner direction.

[rickylabs]

#1089 final acceptance evidence

• --print is the final flag and the next/final argv item is the prompt. The adapter also fails before invocation if that value is empty, flag-shaped, misplaced, or differs from the resolved prompt (8621d4ce0, b36e1a2ed).
• Tests assert the exact argv, printIndex === args.length - 2, a non-flag prompt value, and loud rejection of empty/flag-shaped values.
• Real Antigravity invocation proved prompt delivery:
  • Prompt: Reply with exactly ANTIGRAVITY_PROMPT_VALUE_1089_FINAL_OK and nothing else.
  • Response: ANTIGRAVITY_PROMPT_VALUE_1089_FINAL_OK
• agentic:antigravity-evidence passed against corrected argv: exit 0, no diagnostics, headless: supported, structured_output: supported, raw output not retained.

Final gates on pushed head:

• deno task check: cached artifact valid, inputs unchanged
• deno test -A .llm/tools/agentic/: 324 passed, 0 failed; includes config/no-hardcoded-volatile_test.ts and runtime/routing-policy_test.ts
• scoped lint/fmt wrappers: 127 files, 0 findings
• independent Claude/Opus fix(agentic): Antigravity adapter argv drops the prompt — --print swallows --print-timeout as its value #1089 slice review: PASS; 25 focused guards independently green