`.meta()` advertises every node of the declaration; `nodeToZod` only walks the
ones it can type. Everything below follows from that gap, so the keyword
allowlist moves into `sanitiseNode`, which is the one walker that sees every
node.
A `pattern` was compiled straight into a RegExp and run on the main thread
against caller input, with no timeout and nothing to abort it: `^(a+)+$` against
33 characters stops the whole server, not just MCP. That is an escape from the
supervised child into the host event loop, and it does not take malice, since a
hand-written email pattern is the classic accident. Quantified groups that repeat
or alternate inside are refused, and the source is capped.
`mcp:tools` counted as a side effect, so `readOnlyHint` was structurally
unreachable: holding that grant is what lets a plugin advertise a tool at all.
Every plugin tool was therefore advertised as potentially destructive and every
client's auto-approval was off. It is a host entry point like `hook:*`, and is
classified as one.
Property names, `default` and `examples` were the strings that never met the
sanitiser. A key may carry newlines, so `\n## SYSTEM\n...` in one defeated the
newline collapse everything else goes through. Names are identifiers now; sample
values keep their own keys but have their strings bounded.
Also refused at parse time, which is what the rest of the file already does: an
object `enum` member carrying `$ref` past the deep scan, a non-boolean
`additionalProperties` advertised and checked by nothing, `enum` beside
`properties` skipping the children, a root `enum`/`const`/`nullable` producing a
non-object schema the SDK cannot read, and a draft-4 `exclusiveMinimum: true`
dropped from the check while staying in the advertisement.
`required` used `in`, so a field named `toString` read as present on every call.
Nodes are built with a null prototype, and the three names Zod cannot round-trip
are refused rather than silently lost.
A result block that had to be shortened got no marker and no log line, which
reads to the model like the whole answer. It is counted now, like a dropped one,
and `isError` survives every envelope path.
The security test file carried two raw NUL bytes, so git, GitHub and ripgrep all
treated it as binary: no diff, no blame, no review. Escaped, same runtime value.
Found in review of the branch. Each one is a case where the host told the
model or the admin something it did not enforce.
Advertised schemas are now enforced. buildToolInputSchema built a loose
object that checked only which keys were present, so a tool advertising
an integer, an enum and additionalProperties: false accepted a string, an
unlisted value and an extra property. .meta() still advertises the
declaration verbatim, and the schema underneath it is now built from that
same declaration, so the two cannot disagree. Anything the builder cannot
enforce (oneOf, unknown formats, non-primitive enum members) is refused by
parseManifest rather than advertised, and the failure lands at install
time where an admin sees it.
Writing the test for that turned up a live bug: z.custom() cannot be
represented in JSON Schema, so building enums that way would have thrown
inside tools/list for the whole session. Enums and consts are real literal
types now.
readOnlyHint classification fails closed. The side-effect list spelled out
db:write: and missed db:create:trips entirely, letting a plugin that can
create trips advertise a tool as read-only and idempotent, which is what
clients gate auto-approval on. It is an allowlist of read-only grants now,
and mcp-tool-annotations.test.ts walks the whole catalog so a new
permission fails a test rather than producing a wrong hint.
The result cap covers the whole result. It bounded each text block, so a
hundred blocks cost a hundred times the limit: 6.5M characters in a probe,
now 65K. Large objects are serialised with a budget instead of stringified
whole and then sliced, and the block count is capped.
The admin tool list was dead code. The registry preview carries only
widget and tripPage, so the section added for it never rendered, and the
UI hid the description behind the title when both existed. The preview
carries sanitised tools now (previewManifest is exported and tested, which
is how the gap survived), and both fields render, description always.
plugins:use is out of the DCR default. Adding it to ALL_SCOPES meant a
registration that names no scopes got it and had it pre-selected at
consent. Defaults come from DEFAULT_CLIENT_SCOPES now; asking for it by
name still works.
The public ManifestCapabilities gained mcpTools, so a typed manifest can
express what the runtime already validates.
MCPANN-001..005, MCPENF-001..010, MCPPREV-001..005, MCPTOOLS-020..022,
SDKP-015b/c.
Maurice