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Tail remote MCP logs before downloading #1797

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Merged
xeophon merged 1 commit into from
Jun 21, 2026
+7 −2
Merged

Tail remote MCP logs before downloading #1797

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9 changes: 7 additions & 2 deletions verifiers/v1/mcp/launch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -171,10 +171,15 @@ async def _install_in_sandbox(server: ServerBase, runtime: Runtime) -> str:


async def log_tail(runtime: Runtime, log: str, limit: int = 2000) -> str:
"""The tail of a program's `log` file in `runtime`, empty if it can't be read — for
"""The last `limit` bytes of a program's `log` in `runtime`, empty if it can't be read — for
enriching an error with what the program (e.g. a tool server) wrote before it died."""
if limit <= 0:
return ""
with contextlib.suppress(Exception):
return (await runtime.read(log)).decode(errors="replace").strip()[-limit:]
# Tail in place so a large remote log never crosses into host memory in full.
result = await runtime.run(["tail", "-c", str(limit), log], {})
if result.exit_code == 0:
return result.stdout
return ""


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