df5379c047* fix: harden JSON-RPC input parsing against malformed input and DoS
MessageFactory::create() detected batches via $input[0] === '{', which
mishandled valid-but-non-object JSON: a scalar ("5") or leading-whitespace
object silently returned [] (with a PHP warning) or could reach a foreach
over a non-array. It also had no bound on batch size, letting one small
request expand into arbitrarily many operations (amplification).
- Detect single-vs-batch from the decoded JSON type (object vs list array)
instead of the raw first byte; reject scalars and empty payloads as
InvalidInputMessageException rather than crashing or no-oping.
- Cap batch size (maxBatchSize, default 100) and reject oversized batches.
- Reject non-object batch elements as InvalidInputMessageException instead
of letting them hit a TypeError.
- Bound the StreamableHttpTransport POST body (maxBodyBytes, default 4 MiB),
returning 413, with an incremental read so unknown-size/chunked bodies
cannot exhaust memory.
* docs: document input-hardening limits in CHANGELOG and transports guide
Add CHANGELOG entries and docs/transports.md sections for the JSON-RPC
batch size cap (maxBatchSize) and the StreamableHttpTransport request
body size cap (maxBodyBytes), plus the type-based single-vs-batch
message detection.
98 lines
8.6 KiB
Markdown
98 lines
8.6 KiB
Markdown
# Changelog
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All notable changes to `mcp/sdk` will be documented in this file.
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0.6.0
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-----
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* Add `Builder::add(Tool|ResourceDefinition|ResourceTemplate|Prompt $definition, ElementHandlerInterface $handler)` for explicit registration of elements whose schema is only known at runtime.
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* Add handler interfaces `ToolHandlerInterface`, `ResourceHandlerInterface`, `ResourceTemplateHandlerInterface`, `PromptHandlerInterface`, and the `ElementHandlerInterface` marker.
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* [BC Break] Renamed `Mcp\Schema\Resource` to `Mcp\Schema\ResourceDefinition`. No alias.
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* [BC Break] Renamed `Mcp\Capability\Registry\Loader\ArrayLoader` to `Mcp\Capability\Registry\Loader\ReflectedElementLoader`.
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* [BC Break] Bump default protocol version to `2025-11-25`
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* Add support for MCP Apps extension in schema and server
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* Add `extensions` to `ServerCapabilities` and `ClientCapabilities` and `Builder::enableExtension()`
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* Allow overriding the default name pattern for Discovery
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* Add configurable session garbage collection (`gcProbability`/`gcDivisor`)
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* Add optional `title` field to `ResourceDefinition` and `ResourceTemplate` for MCP spec compliance
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* Add `ChainLoader` to compose multiple `LoaderInterface` implementations via explicit ordering.
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* Add `RegistryInterface::unregisterTool()`, `unregisterResource()`, `unregisterResourceTemplate()`, `unregisterPrompt()` — idempotent removals.
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* Add `RegistryInterface::hasTool()`, `hasResource()`, `hasResourceTemplate()`, `hasPrompt()` — by-name existence checks.
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* `DiscoveryLoader` now refreshes only its own previously written entries; manual registrations (via `Builder::addTool()` etc. or runtime `$registry->registerTool()` calls) survive rediscovery, and a same-name manual registration takes precedence over discovery on collision.
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* [BC Break] Removed `ElementReference::$isManual` public property and the `bool $isManual` parameter from all `*Reference` constructors. Origin tracking is no longer carried on the element; manual-over-discovered precedence is encoded by loader execution order.
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* [BC Break] `RegistryInterface::registerTool()`, `registerResource()`, `registerResourceTemplate()`, `registerPrompt()` lost their trailing `bool $isManual = false` parameter. Callers using positional arguments must drop the flag.
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* [BC Break] Removed `RegistryInterface::clear()`, `getDiscoveryState()`, `setDiscoveryState()`. Rediscovery now goes through `DiscoveryLoader::load()` directly.
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* `Registry::register*()` semantics changed to plain last-write-wins (overwrites silently) and the methods now return the stored `*Reference`. The previous "discovered registration is ignored when a manual one already exists" precedence rule still applies, but is now enforced by `DiscoveryLoader` via reference-identity tracking — and still emits a debug log when a discovery is skipped due to a conflicting registration.
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* Add optional `title` parameter to `Builder::addResource()` and `Builder::addResourceTemplate()` for MCP spec compliance
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* [BC Break] `Builder::addResource()` signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments must switch to named arguments.
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* [BC Break] `Builder::addResourceTemplate()` signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments must switch to named arguments.
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* Add `CorsMiddleware`, `DnsRebindingProtectionMiddleware`, and `ProtocolVersionMiddleware` for `StreamableHttpTransport`, composed automatically as the default stack via `StreamableHttpTransport::defaultMiddleware()`
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* [BC BREAK] `StreamableHttpTransport` constructor: `$corsHeaders` parameter removed; CORS is now configured via `CorsMiddleware`. The `$middleware` parameter is nullable — `null` (or omitted) installs the default stack; `[]` disables all defaults. Default `Access-Control-Allow-Origin` is no longer set (was `*`).
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* [BC Break] `ResourceDefinition::__construct()` signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments must switch to named arguments.
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* [BC Break] `ResourceTemplate::__construct()` signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments must switch to named arguments.
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* [BC Break] `McpResource` and `McpResourceTemplate` attribute signatures changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments must switch to named arguments.
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* Harden JSON-RPC input parsing: single-message vs batch is now decided from the decoded JSON type (object → single, list array → batch) instead of the raw first byte. Scalars, empty payloads, and non-object batch elements are surfaced as `InvalidInputMessageException` entries instead of triggering warnings or a `TypeError`.
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* Add `maxBatchSize` (default `100`) to `MessageFactory` — oversized JSON-RPC batches are rejected before any message is constructed, guarding against amplification.
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* Add `maxBodyBytes` (default 4 MiB) to `StreamableHttpTransport` — POST bodies exceeding the cap are rejected with `413`. Unknown-size/chunked bodies are read incrementally and stopped at the cap so they cannot exhaust memory.
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0.5.0
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* Add built-in authentication middleware for HTTP transport using OAuth
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* Add client component for building MCP clients
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* Add `Builder::setReferenceHandler()` to allow custom `ReferenceHandlerInterface` implementations (e.g. authorization decorators)
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* Add elicitation enum schema types per SEP-1330: `TitledEnumSchemaDefinition`, `MultiSelectEnumSchemaDefinition`, `TitledMultiSelectEnumSchemaDefinition`
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* [BC break] Make Symfony Finder component optional. Users would need to install `symfony/finder` now themselves
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* Add `LenientOidcDiscoveryMetadataPolicy` for identity providers that omit `code_challenge_methods_supported` (e.g. FusionAuth, Microsoft Entra ID)
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* Add OAuth 2.0 Dynamic Client Registration middleware (RFC 7591)
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* Add optional `title` field to `Prompt` and `McpPrompt` for MCP spec compliance
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* [BC Break] `Builder::addPrompt()` signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments for `$description` must switch to named arguments.
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* Add optional `title` field to `Tool` and `McpTool` for MCP spec compliance
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* [BC Break] `Tool::__construct()` signature changed — `$title` parameter added between `$name` and `$inputSchema`. Callers using positional arguments must switch to named arguments or pass `null` for `$title`.
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* [BC Break] `McpTool` attribute signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments for `$description` must switch to named arguments.
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* [BC Break] `Builder::addTool()` signature changed — `$title` parameter added between `$name` and `$description`. Callers using positional arguments for `$description` must switch to named arguments.
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0.4.0
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-----
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* Rename `Mcp\Server\Session\Psr16StoreSession` to `Mcp\Server\Session\Psr16SessionStore`
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* Add missing handlers for resource subscribe/unsubscribe and persist subscriptions via session
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* Introduce `SessionManager` to encapsulate session handling (replaces `SessionFactory`) and move garbage collection logic from `Protocol`.
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0.3.0
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* Add output schema support to MCP tools
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* Add validation of the input parameters given to a Tool.
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* Rename `Mcp\Capability\Registry\ResourceReference::$schema` to `Mcp\Capability\Registry\ResourceReference::$resource`.
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* Introduce `SchemaGeneratorInterface` and `DiscovererInterface` to allow custom schema generation and discovery implementations.
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* Remove `DocBlockParser::getSummary()` method, use `DocBlockParser::getDescription()` instead.
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0.2.2
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-----
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* Throw exception when trying to inject parameter with the unsupported names `$_session` or `$_request`.
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* `Throwable` objects are passed to log context instead of the exception message.
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0.2.1
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* Add `RunnerControl` for `StdioTransport` to allow break out from continuously listening for new input.
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* Open range of supported Symfony versions to include v5.4
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0.2.0
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* Make `Protocol` stateless by decouple if from `TransportInterface`. Removed `Protocol::getTransport()`.
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* Change signature of `Builder::addLoaders(...$loaders)` to `Builder::addLoaders(iterable $loaders)`.
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* Removed `ClientAwareInterface` in favor of injecting a `RequestContext` with argument injection.
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* The `ClientGateway` cannot be injected with argument injection anymore. Use `RequestContext` instead.
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* Removed `ClientAwareTrait`
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* Removed `Protocol::getTransport()`
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* Added parameter for `TransportInterface` to `Protocol::processInput()`
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0.1.0
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-----
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* First tagged release of package
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* Support for implementing MCP server
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