chore(main): release 0.3.0 (#337)

🤖 I have created a release *beep* *boop*
---


##
[0.3.0](v0.2.16...v0.3.0)
(2025-07-31)


### ⚠ BREAKING CHANGES

* **deps:** Make opentelemetry an optional dependency
([#369](#369))
* **spec:** Update Agent Card Well-Known Path to
`/.well-known/agent-card.json`
([#320](#320))
* Remove custom `__getattr__` and `__setattr__` for `camelCase` fields
in `types.py`
([#335](#335))
* Add mTLS to SecuritySchemes, add oauth2 metadata url field, allow
Skills to specify Security
([#362](#362))
* Support for serving agent card at deprecated path
([#352](#352))

### Features

* Add `metadata` as parameter to `TaskUpdater.update_status()`
([#371](#371))
([9444ed6](9444ed6))
* Add mTLS to SecuritySchemes, add oauth2 metadata url field, allow
Skills to specify Security
([#362](#362))
([be6c517](be6c517))
* Add RESTful API Serving
([#348](#348))
([82a6b7c](82a6b7c))
* Add server-side support for plumbing requested and activated
extensions ([#333](#333))
([4d5b92c](4d5b92c))
* Allow agent cards (default and extended) to be dynamic
([#365](#365))
([ee92aab](ee92aab))
* Support for serving agent card at deprecated path
([#352](#352))
([2444034](2444034))
* support non-blocking `sendMessage`
([#349](#349))
([70b4999](70b4999))
* Type update to support fetching extended card
([#361](#361))
([83304bb](83304bb))


### Bug Fixes

* Add Input Validation for Task Context IDs in new_task Function
([#340](#340))
([a7ed7ef](a7ed7ef))
* **deps:** Reduce FastAPI library required version to `0.95.0`
([#372](#372))
([a319334](a319334))
* Remove `DeprecationWarning` for regular properties
([#345](#345))
([2806f3e](2806f3e))
* **spec:** Add `SendMessageRequest.request` `json_name` mapping to
`message` proto
([bc97cba](bc97cba))
* **spec:** Add Transport enum to specification
(a2aproject/A2A#909)
([d9e463c](d9e463c))


### Documentation

* Address typos in docstrings and docs.
([#370](#370))
([ee48d68](ee48d68))


### Miscellaneous Chores

* Add support for authenticated extended card method
([#356](#356))
([b567e80](b567e80))


### Code Refactoring

* **deps:** Make opentelemetry an optional dependency
([#369](#369))
([9ad8b96](9ad8b96))
* Remove custom `__getattr__` and `__setattr__` for `camelCase` fields
in `types.py`
([#335](#335))
([cd94167](cd94167))
* **spec:** Update Agent Card Well-Known Path to
`/.well-known/agent-card.json`
([#320](#320))
([270ea9b](270ea9b))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

CHANGELOG.md

@@ -1,5 +1,53 @@
 # Changelog
 
+## [0.3.0](https://github.com/a2aproject/a2a-python/compare/v0.2.16...v0.3.0) (2025-07-31)
+
+
+### ⚠ BREAKING CHANGES
+
+* **deps:** Make opentelemetry an optional dependency ([#369](https://github.com/a2aproject/a2a-python/issues/369))
+* **spec:** Update Agent Card Well-Known Path to `/.well-known/agent-card.json` ([#320](https://github.com/a2aproject/a2a-python/issues/320))
+* Remove custom `__getattr__` and `__setattr__` for `camelCase` fields in `types.py` ([#335](https://github.com/a2aproject/a2a-python/issues/335))
+* Add mTLS to SecuritySchemes, add oauth2 metadata url field, allow Skills to specify Security ([#362](https://github.com/a2aproject/a2a-python/issues/362))
+* Support for serving agent card at deprecated path ([#352](https://github.com/a2aproject/a2a-python/issues/352))
+
+### Features
+
+* Add `metadata` as parameter to `TaskUpdater.update_status()` ([#371](https://github.com/a2aproject/a2a-python/issues/371)) ([9444ed6](https://github.com/a2aproject/a2a-python/commit/9444ed629b925e285cd08aae3078ccd8b9bda6f2))
+* Add mTLS to SecuritySchemes, add oauth2 metadata url field, allow Skills to specify Security ([#362](https://github.com/a2aproject/a2a-python/issues/362)) ([be6c517](https://github.com/a2aproject/a2a-python/commit/be6c517e1f2db50a9217de91a9080810c36a7a1b))
+* Add RESTful API Serving ([#348](https://github.com/a2aproject/a2a-python/issues/348)) ([82a6b7c](https://github.com/a2aproject/a2a-python/commit/82a6b7cc9b83484a4ceabc2323e14e2ff0270f87))
+* Add server-side support for plumbing requested and activated extensions ([#333](https://github.com/a2aproject/a2a-python/issues/333)) ([4d5b92c](https://github.com/a2aproject/a2a-python/commit/4d5b92c61747edcabcfd825256a5339bb66c3e91))
+* Allow agent cards (default and extended) to be dynamic ([#365](https://github.com/a2aproject/a2a-python/issues/365)) ([ee92aab](https://github.com/a2aproject/a2a-python/commit/ee92aabe1f0babbba2fdbdefe21f2dbe7a899077))
+* Support for serving agent card at deprecated path ([#352](https://github.com/a2aproject/a2a-python/issues/352)) ([2444034](https://github.com/a2aproject/a2a-python/commit/2444034b7aa1d1af12bedecf40f27dafc4efec95))
+* support non-blocking `sendMessage` ([#349](https://github.com/a2aproject/a2a-python/issues/349)) ([70b4999](https://github.com/a2aproject/a2a-python/commit/70b499975f0811c8055ebd674bcb4070805506d4))
+* Type update to support fetching extended card ([#361](https://github.com/a2aproject/a2a-python/issues/361)) ([83304bb](https://github.com/a2aproject/a2a-python/commit/83304bb669403b51607973c1a965358d2e8f6ab0))
+
+
+### Bug Fixes
+
+* Add Input Validation for Task Context IDs in new_task Function ([#340](https://github.com/a2aproject/a2a-python/issues/340)) ([a7ed7ef](https://github.com/a2aproject/a2a-python/commit/a7ed7efed8fcdcc556616a5fc1cb8f968a116733))
+* **deps:** Reduce FastAPI library required version to `0.95.0` ([#372](https://github.com/a2aproject/a2a-python/issues/372)) ([a319334](https://github.com/a2aproject/a2a-python/commit/a31933456e08929f665ccec57ac07b8b9118990d))
+* Remove `DeprecationWarning` for regular properties ([#345](https://github.com/a2aproject/a2a-python/issues/345)) ([2806f3e](https://github.com/a2aproject/a2a-python/commit/2806f3eb7e1293924bb8637fd9c2cfe855858592))
+* **spec:** Add `SendMessageRequest.request` `json_name` mapping to `message` proto ([bc97cba](https://github.com/a2aproject/a2a-python/commit/bc97cba5945a49bea808feb2b1dc9eeb30007599))
+* **spec:** Add Transport enum to specification (https://github.com/a2aproject/A2A/pull/909) ([d9e463c](https://github.com/a2aproject/a2a-python/commit/d9e463cf1f8fbe486d37da3dd9009a19fe874ff0))
+
+
+### Documentation
+
+* Address typos in docstrings and docs. ([#370](https://github.com/a2aproject/a2a-python/issues/370)) ([ee48d68](https://github.com/a2aproject/a2a-python/commit/ee48d68d6c42a2a0c78f8a4666d1aded1a362e78))
+
+
+### Miscellaneous Chores
+
+* Add support for authenticated extended card method ([#356](https://github.com/a2aproject/a2a-python/issues/356)) ([b567e80](https://github.com/a2aproject/a2a-python/commit/b567e80735ae7e75f0bdb22f025b97895ce3b0dd))
+
+
+### Code Refactoring
+
+* **deps:** Make opentelemetry an optional dependency ([#369](https://github.com/a2aproject/a2a-python/issues/369)) ([9ad8b96](https://github.com/a2aproject/a2a-python/commit/9ad8b9623ffdc074ec561cbe65cfc2a2ba38bd0b))
+* Remove custom `__getattr__` and `__setattr__` for `camelCase` fields in `types.py` ([#335](https://github.com/a2aproject/a2a-python/issues/335)) ([cd94167](https://github.com/a2aproject/a2a-python/commit/cd941675d10868922adf14266901d035516a31cf))
+* **spec:** Update Agent Card Well-Known Path to `/.well-known/agent-card.json` ([#320](https://github.com/a2aproject/a2a-python/issues/320)) ([270ea9b](https://github.com/a2aproject/a2a-python/commit/270ea9b0822b689e50ed12f745a24a17e7917e73))
+
 ## [0.2.16](https://github.com/a2aproject/a2a-python/compare/v0.2.15...v0.2.16) (2025-07-21)