release: v0.4.0

Author: DaleSeo

.changesets/feat_jeffrey_allow_passing_in_url_overrides.md

@@ -4,6 +4,56 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# [0.4.0] - 2025-06-17
+
+## 🚀 Features
+
+### Add `--collection <COLLECTION_ID>` as another option for operation source
+
+Use operation collections as the source of operations for your MCP server. The server will watch for changes and automatically update when you change your operation collection.
+
+### Allow overriding registry endpoints 
+
+Set APOLLO_UPLINK_ENDPOINTS and APOLLO_REGISTRY_URL to override the endpoints for fetching schemas and operations
+
+### Add client metadata to GraphQL requests - @pubmodmatt PR #137
+
+The MCP Server will now identify itself to Apollo Router through the `ApolloClientMetadata` extension. This allows traffic from MCP to be identified in the router, for example through telemetry.
+
+### Update license to MIT - @kbychu PR #122
+
+The Apollo MCP Server is now licensed under MIT instead of ELv2
+
+## 🐛 Fixes
+
+### Fix GetAstronautsCurrentlyInSpace query - @pubmodmatt PR #114
+
+The `GetAstronautsCurrentlyInSpace` in the Quickstart documentation was not working.
+
+### Change explorer tool to return URL - @pubmodmatt PR #123
+
+The explorer tool previously opened the GraphQL query directly in the user's browser. Although convenient, this would only work if the MCP Server was hosted on the end user's machine, not remotely. It will now return the URL instead.
+
+### Fix bug in operation directory watching - @pubmodmatt PR #135
+
+Operation directory watching would not trigger an update of operations in some cases.
+
+### fix: handle headers with colons in value - @DaleSeo PR #128
+
+The MCP server won't crash when a header's value contains colons.
+
+## 🛠 Maintenance
+
+### Automate changesets and changelog - @pubmodmatt PR #107
+
+Contributors can now generate a changeset file automatically with:
+```console
+cargo xtask changeset create
+```
+This will generate a file in the `.changesets` directory, which can be added to the pull request.
+
+
+
 ## [0.3.0] - 2025-05-29
 
 ### 🚀 Features