A cron job that sets `enabled_toolsets` to a list of *native* toolsets (e.g.
`["web", "terminal"]`) silently got ZERO MCP tools, while a job with no
per-job list got every globally-enabled MCP server. `_resolve_cron_enabled_
toolsets` returned the per-job list verbatim, bypassing the MCP-merge that the
platform-fallback branch performs via `_get_platform_tools`. So
`discover_mcp_tools()` registered the MCP tools into the registry, but
`get_tool_definitions(enabled_toolsets=...)` kept only the named native
toolsets — the agent then rejected every `mcp_*` call as "Unknown tool". (R2
of #23997.)
Fix: `_merge_mcp_into_per_job_toolsets` layers MCP membership onto a per-job
allowlist with the SAME semantics as `_get_platform_tools`:
* `no_mcp` sentinel present -> no MCP servers (sentinel stripped)
* one or more MCP server names already listed -> treat as an allowlist
* otherwise -> union in every globally-enabled MCP server
To avoid duplicating the "which MCP servers are enabled" computation (it
already existed inline in `_get_platform_tools`), this extracts a shared
`enabled_mcp_server_names(config)` helper in `hermes_cli.tools_config` and has
BOTH the gateway/CLI platform resolver and the cron per-job resolver call it —
so every path agrees on MCP membership (extend, don't duplicate).
Note: the issue's *headline* — bare MCP server names rejected, registry never
includes them — was already fixed on main (commits c10fea8d2 + 04918345e,
both before the issue was filed). This PR closes the remaining cron-specific
gap (R2). The `server:*` / `mcp:server` alias-notation rejection (R1) and the
quiet-mode silent-drop (R3) are tracked separately.
Salvaged from #32788 by sherman-yang (credited below). Reworked to reuse the
shared `enabled_mcp_server_names` helper instead of re-implementing the MCP
membership set in cron/scheduler.py.
Fixes#23997
Co-authored-by: sherman-yang <58446328+sherman-yang@users.noreply.github.com>
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