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docs(mcp): fix spec inconsistency: empty MCP_SERVICES means zero services

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Self-review caught a contradiction: the spec's prose said
'MCP_SERVICES="" (empty) -> zero services mount' but the code example
in the spec used 'if not raw: return services' which conflates unset
and empty (both fall through to 'all mount').

Fix: _filter_by_env now uses 'MCP_SERVICES' not in os.environ to
distinguish unset (backward compat: all mount) from empty (explicit
choice: zero mount). Test cases already specified the correct behavior.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Claude
2026-06-30 11:13:23 +00:00
committed by tao.chen
co-authored by Claude Fable 5
parent 579e81af82
commit f35707c9f3
1 changed files with 6 additions and 3 deletions
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docs/superpowers/specs/2026-06-30-pluggable-mcp-design.md
+6 -3
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@@ -121,10 +121,13 @@ BUILTIN_SERVICES: list[str] = [
def _filter_by_env(services: list[McpService]) -> list[McpService]:
"""Whitelist by `MCP_SERVICES` env. Unset = no filter (backward compat)."""
raw = os.environ.get("MCP_SERVICES")
if not raw:
"""Whitelist by `MCP_SERVICES` env. Unset = no filter (backward compat).
Empty string = zero services (explicit operator choice, distinct from unset)."""
if "MCP_SERVICES" not in os.environ:
return services
raw = os.environ["MCP_SERVICES"]
if not raw:
return []
allowed = {n.strip() for n in raw.split(",") if n.strip()}
return [s for s in services if s.name in allowed]