mcp-tokens/ holds live MCP OAuth access tokens (<server>.json) and
dynamically-registered OAuth client credentials (<server>.client.json),
layout per tools/mcp_oauth.py. This is the same credential class as
auth.json/credentials/, which _media_delivery_denied_paths() already
blocks. The write side already denies this dir (file_tools
_check_sensitive_path), but the media-delivery (read/exfil) side did
not, leaving an unpaired half-door.
Without it, a prompt-injection MEDIA: tag emitting
~/.hermes/mcp-tokens/<server>.json would, in default (non-strict)
mode, pass the denylist and exfiltrate a live OAuth bearer token to
the same untrusted channel. Sibling follow-up to commit 4ec0adebe
(config.yaml media-delivery denylist).
mcp-tokens is a directory and _path_under_denied_prefix already does
containment matching, so the whole subtree (.json/.client.json/
.meta.json) is denied, mirroring credentials/.
42d0174699