Validating a struct is ambiguous, because a zero field could be
considered missing or present.
Interpret a zero optional struct field in whichever way results in
success.
Change-Id: I6a9474e6f6558d2a8522bc5ba0451967367e467d
Reviewed-on: https://go-review.googlesource.com/c/tools/+/675956
Reviewed-by: Alan Donovan <adonovan@google.com>
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Change-Id: I8066b22cb87e09fb160de3b8ff2d8fdde6ec3dcf
Reviewed-on: https://go-review.googlesource.com/c/tools/+/675815
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
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This CL adds paginating functionality for tools. It uses the gob encoder
for creating opaque cursors. More CLs to follow for paginating other features.
Change-Id: I1443c0213ceb6238d844a8eee9a0be52934f5cab
Reviewed-on: https://go-review.googlesource.com/c/tools/+/675055
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
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Pass GetPromptParams as needed, in case that type ever gets additional
properties.
Change-Id: I83fa37bb2af5633a8c2bcdc47a85c3030dfe70fb
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674895
Auto-Submit: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
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Provide a ServerSession method that directly implements the spec
method.
Also provide a custom slog.Handler that writes a notification on each
log call. It uses a slog.JSONHandler to format the message as JSON, then
adds the additional fields of LoggingMessageParams.
I decided that the direct method should handle levels, since that is
in the spec, but that rate-limiting is an extra feature, so is only
provided in the slog handler.
Change-Id: I1190ca124e992e61fb633ac52ee3492c8e6d99c9
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674498
Auto-Submit: Jonathan Amsterdam <jba@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
Document the package.
Change-Id: I770c14d6339b75ea6827280c23171c3584dc1071
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674977
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Jonathan Amsterdam <jba@google.com>
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Add additional fields to Schema which are mentioned in the spec but
do not affect validation.
Change-Id: I89488261a00c207d01cd7fc59d782f43692fe528
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674976
Reviewed-by: Alan Donovan <adonovan@google.com>
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Auto-Submit: Jonathan Amsterdam <jba@google.com>
Use the weave program from golang.org/x/example to weave together
the README text with buildable programs. This ensures the code in the
README compiles.
Change-Id: Ib5e10c8f808cc6d1ed4addbee784607e910ba30b
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673796
Reviewed-by: Robert Findley <rfindley@google.com>
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Add notification logic for intialization and list changes.
Change-Id: I1d392bb49d5995f2046c400da955a033ab2715ce
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673775
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
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Reviewed-by: Robert Findley <rfindley@google.com>
Fix some typos found during the Google import of x/tools.
Change-Id: I8ea38d3e1bd09bedbc98ed8c8146e88e84aa051f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674975
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
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A dynamic reference is like a dynamic variable in a programming
language, with two twists:
- There must be a dynamic anchor in lexical scope for the ref to
resolve. (Think of it as declaring the dynamic variable.)
- The ref resolves to the schema highest on the stack, not lowest.
That feels odd, but it turns out to work for the intended purpose,
which is to provide extension points for additional features.
There is some distracting code motion and refactoring in this CL:
resolveRefs was moved down in the file, and resolution of a single
ref was split off.
Change-Id: I17da6052e0782fc540d14b8a41b06a2645923872
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674155
Auto-Submit: Jonathan Amsterdam <jba@google.com>
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This change is necessary to support pagination which will be implemented
in subsequent CLs.
Change-Id: I8bc616a57463ea569dc7cadf1d4f06c69602ddd5
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674135
Reviewed-by: Jonathan Amsterdam <jba@google.com>
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Remove a TODO that was in package doc position.
Change-Id: Ib98dbcd7d733fdf0059bc3ced1fd6a1008b91a26
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674257
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Augment the generator to create constants for all method names.
Change-Id: I858e516b1afec0aa3cf3b9852cbdfc16aec4c553
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673177
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Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Implement middleware for clients.
Make the middleware types generic so we can factor out code
from both peers.
I was able to make the request handler generic, with one weird trick
(see handleRequest).
The first three declarations of shared.go, and a few others as well,
are copied unchanged from middleware.go.
Change-Id: Ib3239d8fcfda022ddb5b554c38cff4cdbc3704c1
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673635
Reviewed-by: Robert Findley <rfindley@google.com>
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Provide secure reading of files on the local filesystem.
There are subtleties in path manipulation on Windows that I don't fully
understand, so I defer that work for now.
Change-Id: Ic11f4617dde4ac0b31ccd5b0a772bb2f56db026f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673196
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
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Implement the dispatcher middleware framework, allowing users to
wrap method dispatching with their own code.
The Dispatcher functions have an untyped params arg, but expect its
value to be a typed, unmarshaled XXXParams struct. That required
splitting the elegant dispatch[P, R] function into two parts, one
to do the unmarshaling and one to call the method. The nicest way
I could find to do that was to map from method names to a pair
of functions, one to unmarshal and one to call. We could also write
it as two switches on method name, which would require less machinery
but would duplicate the list of method names, already a tad fragile
because they are literal strings.
I also exported the initialize params and result, so user Dispatchers
could access them. All Params and Result types will have to be exported
for that reason.
Change-Id: Ie2c95cc17b4ef3d3d095dccdadb294e5f1590796
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673515
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Due to the irregularities of github-flavored markdown, I had to join all
paragraphs before posting the public design. Additionally, I made a few
wording tweaks.
If we want to continue editing the design here, we should keep it in
sync with the public design discussion. Therefore, copy back those
changes.
Change-Id: Ie6ab3b3f59b923bb58540e86bbb1451ce0b4815d
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673199
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Reviewed-by: Jonathan Amsterdam <jba@google.com>
Do another pass of clean up for the design prior to posting.
Also, add a cached Roots iterator, as discussed.
Change-Id: If8d444b23c7332b89effb2fce8b3be28841f0882
Reviewed-on: https://go-review.googlesource.com/c/tools/+/673195
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Reviewed-by: Jonathan Amsterdam <jba@google.com>
Update the README to reflect recent API changes. Also, remove some
design discussion in the README, to instead refer to the canonical
design doc.
Change-Id: Id77d34c6364d0a35e33f6952a291b3b659ad732b
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672619
Reviewed-by: Jonathan Amsterdam <jba@google.com>
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Do a pass through the design doc, adding a bit more clean-up and
commentary.
Additionally, update ServerTool and ServerPrompt to be consistent with
the design.
Change-Id: I1b75c4690d86fe8946d512cb36a1fc2938b3c883
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672576
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Auto-Submit: Robert Findley <rfindley@google.com>
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Since cancellation is handled transparently, this type need not be
exported.
Change-Id: Id4e195b0c3bd49eca52587032a027ffa449eb9d1
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672796
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Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Add a logical client session type back to the SDK, to bring it closer to
the design. Also, remove 'ConnectionOptions', which is better
implemented using middleware, and reimplement logging as a
LoggingTransport middleware, which is also added to the design.
Change-Id: I908b4f837d513ffc60ae5b6171a31519cffafebc
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672795
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Reviewed-by: Jonathan Amsterdam <jba@google.com>
Various typo and style changes.
Change-Id: Ifd4322dcf0bf2b2653bb38a023a51056424cca39
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672815
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Commit-Queue: Jonathan Amsterdam <jba@google.com>
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Add a link to a recent commit that illustrates a backward-compatible
change.
Change-Id: I5e277f9417cf9bbbc5146512e29a3cb8205a4e14
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672716
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
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Update the design to mention our in-memory transport, since it is
generally useful, and update the implementation to use distinct types
for InMemoryTransport and StdIOTransport (the fact that they are both
implemented as an io.ReadWriteCloser is an implementation detail).
Change-Id: I8228ccf2092a56a730c113c4db105fb492cce112
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672715
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
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Bring the Server implementation up to date with the spec by renaming
ServerConnection to ServerSession. Also update variable names, which
were in various states of disarray from the multiple renamings of this
type.
Change-Id: I4aec883db6d0500fb91e6daa51b702614877cf8a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672655
Auto-Submit: Robert Findley <rfindley@google.com>
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Reviewed-by: Jonathan Amsterdam <jba@google.com>
Change-Id: I2cb8be82a91dea7755ea5514ee1fbe1e937135c9
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672376
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
TryBot-Bypass: Jonathan Amsterdam <jba@google.com>
Commit-Queue: Jonathan Amsterdam <jba@google.com>
Get the name and signature of the handler right.
Change-Id: I743aaaee45cc07a741ab8ad16e90e1b1d5519b64
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672336
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Change-Id: I5f7a6bad296d23c1bc075eb767a243c24a42668c
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672675
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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Change the type of CallToolParams.Arguments to json.RawMessage.
Change-Id: Ief16ef261b9f41566a1a16efc60a9382a8d414eb
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CallTool takes a tool name, arguments, and an options struct.
Also, pass the params to ToolHandler.
Update the design doc accordingly.
Change-Id: I21b7995b607bea976ad708ebb6ac0716018f39cb
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To ensure backward compatibility, every method in the spec now takes a
*Params struct and returns a *Result struct.
CallTools is an exception: we'll change that in the next CL.
Change-Id: I58835239c67582401b8c9c2d070702d270131c08
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Use pointers for the protocol's struct types, to future-proof against
them getting large.
Change-Id: I55b204080a41c8140539697ba264e502e912e613
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672575
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Also, make sure that NewBlobResourceContents creates a Blob.
Change-Id: I2f0fe2ac6410d6b155deb2c8643a40bc73e25cd4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672418
Reviewed-by: Robert Findley <rfindley@google.com>
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To be compatible with Go 1.23, we cannot use the
encoding/json "omitzero" option. Replace with a
custom MarshalJSON method.
Change-Id: Ied615ea04fb20e2459f9ed20ef03c81edbc74961
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672417
Reviewed-by: Alan Donovan <adonovan@google.com>
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Now that the protocol package is merged into the mcp package, clean up
the higher level 'Content' union types, in favor of types constructors.
Change-Id: I37bedb0ff0a296eef799ba65c37ca7f94ee1dbbe
Reviewed-on: https://go-review.googlesource.com/c/tools/+/672415
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TryBot-Bypass: Jonathan Amsterdam <jba@google.com>
In accordance with the updated design, merge the protocol package into
the mcp package. To do so, rename protocol.Content to WireContent and
protocol.ResourceContents to WireResource.
Also, remove some stray logging in readResource.
Change-Id: I76f61ce8d67dd3ac520ef2e1959ade0a0785a480
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Design for pagination.
Change-Id: I8257a499b1e4691382b5681b84a52030344ab0e3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/671135
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When we check the root schema during resolution, first make sure
its descendants form a tree.
Change-Id: Icc430e7df463aa84b961c28616be567f98960430
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Reviewed-by: Alan Donovan <adonovan@google.com>
Support remote references.
Most of the machinery was in place; we just had to define the
right loader, copy files from the test repo, and download
the meta-schema files from json-schema.org.
Change-Id: Ib588200ef0fa483641b9b53f9904f53b39dc4b82
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Implementation of resources.
This follows the design sketched in design/design.md, except for
Server.FileResourceHandler, which will be in a forthcoming CL.
As the spec recommends, the server verifies an incoming URI from the
client against its list of resources, to make sure the URI came from one
of them.
Some things that aren't in the design doc:
- I provide an exported function that creates a "resource not found"
jsonrpc2.WireEror error for server authors to return.
A wrinkle: the MCP spec defines the error code for
"resource not found" as -32002 [1]. That code is reserved for use
by implementations of JSON-RPC, not applications. That matters to us
because our JSON-RPC implementation already uses that code for the
"server closing" error. I filed a bug against MCP about it [2] and
chose a different code for the "resource not found" error.
- As a slight convenience, I fill in some fields in the
ReadResourceResult if the handler doesn't set them.
[1] https://modelcontextprotocol.io/specification/2025-03-26/server/resources#error-handling
[2] https://github.com/modelcontextprotocol/modelcontextprotocol/issues/509
Change-Id: I06153da982ea00748a3691ded923448a880cea2a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/671363
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Mention that all methods from the spec have the same signature,
and then don't repeat those method declarations.
Modify all method calls in the doc to take a Params struct, even if
the current MCP spec says it is empty.
Change `string` to `[]byte` in some of the listed struct fields.
The current code generator incorrectly generates these as strings.
(I have a forthcoming CL to fix that.)
Also, elaborate the logging design.
Change-Id: I5f323d4d98a4b6045d3cdef770d13b4bfdcb1044
Reviewed-on: https://go-review.googlesource.com/c/tools/+/671358
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Bypass: Jonathan Amsterdam <jba@google.com>
Handle resource subscriptions by delegating to the user.
We don't need to use the word "Resource" in the handlers because
the Subscribe and Unsubscribe methods in the spec don't use that
name. If the spec adds another kind of subscription, they will pick
a new name.
The need for two handlers is dictated by backward compatibility.
We must pass the RPC params to the subscription handler, which means
we need different signatures for subscribe and unsubscribe.
Change-Id: I045abaf52dc9c3e96181331728d50cf36cc8ed91
Reviewed-on: https://go-review.googlesource.com/c/tools/+/671895
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TryBot-Bypass: Jonathan Amsterdam <jba@google.com>
- Change the names of some content-related types to better match
the spec. Most notably, rename Resource to EmbeddedResource,
because the former has a different meaning in the spec.
- Use []byte intead of string where the spec says "base64-encoded data."
- Unexport EmbeddedResource.ToWire.
Change-Id: I9f65efaadadda1b3abc0e58c64a743af1a72852c
Reviewed-on: https://go-review.googlesource.com/c/tools/+/671362
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Commit-Queue: Jonathan Amsterdam <jba@google.com>
You can now write "*" for a name in a config to use the original
name.
Also, fix a bug in dealing with initialisms.
Change-Id: I4d5d0acb1200fff6500644457ec34c5026d63f9f
Reviewed-on: https://go-review.googlesource.com/c/tools/+/671361
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