deploy: chore(main): release 0.29.0 (googleapis#2608)

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

##
[0.29.0](googleapis/mcp-toolbox@v0.28.0...v0.29.0)
(2026-03-13)

### ⚠ BREAKING CHANGES

* **source/alloydb:** restructure prebuilt toolsets
([googleapis#2639](googleapis#2639))
* **source/spanner:** restructure prebuilt toolsets
([googleapis#2641](googleapis#2641))
* **source/dataplex:** restructure prebuilt toolsets
([googleapis#2640](googleapis#2640))
* **source/oss-db:** restructure prebuilt toolsets
([googleapis#2638](googleapis#2638))
* **source/cloudsql:** restructure prebuilt toolsets
([googleapis#2635](googleapis#2635))
* **source/bigquery:** restructure prebuilt toolsets
([googleapis#2637](googleapis#2637))
* **source/firestore:** restructure prebuilt toolsets
([googleapis#2636](googleapis#2636))
* telemetry metrics updates as per semantic convention
([googleapis#2566](googleapis#2566))

### Features

* Add user agent to embeddings generation
([googleapis#2572](googleapis#2572))
([287251a](googleapis@287251a))
* **skill:** Attach user agent metadata for generated skill
([googleapis#2697](googleapis#2697))
([9598a6a](googleapis@9598a6a))
* **skills:** Add additional-notes flag to generate skills command
([googleapis#2696](googleapis#2696))
([73bf962](googleapis@73bf962))
* **skill:** Update skill generation logic
([googleapis#2646](googleapis#2646))
([c233eee](googleapis@c233eee))
* **source/alloydb:** Restructure prebuilt toolsets
([googleapis#2639](googleapis#2639))
([5f3f063](googleapis@5f3f063))
* **source/bigquery:** Restructure prebuilt toolsets
([googleapis#2637](googleapis#2637))
([dc984ba](googleapis@dc984ba))
* **sources/bigquery:** Support custom oauth header name
([googleapis#2564](googleapis#2564))
([d3baf77](googleapis@d3baf77))
* **source/cloudsql:** Restructure prebuilt toolsets
([googleapis#2635](googleapis#2635))
([99613dc](googleapis@99613dc))
* **source/dataplex:** Restructure prebuilt toolsets
([googleapis#2640](googleapis#2640))
([acb9a80](googleapis@acb9a80))
* **source/firestore:** Restructure prebuilt toolsets
([googleapis#2636](googleapis#2636))
([22ab7b9](googleapis@22ab7b9))
* **source/oss-db:** Restructure prebuilt toolsets
([googleapis#2638](googleapis#2638))
([5196c6a](googleapis@5196c6a))
* **source/spanner:** Restructure prebuilt toolsets
([googleapis#2641](googleapis#2641))
([ea2b698](googleapis@ea2b698))
* Telemetry metrics updates as per semantic convention
([googleapis#2566](googleapis#2566))
([131d764](googleapis@131d764))
* **tools/mongodb:** Add tool annotations to MongoDB tools for improved
LLM understanding
([googleapis#2219](googleapis#2219))
([b7a5f80](googleapis@b7a5f80))
* **tools/serverless-spark:** Add get_session_template tool
([googleapis#2308](googleapis#2308))
([a136e16](googleapis@a136e16))
* **tools/serverless-spark:** Add list/get sessions tools
([googleapis#2576](googleapis#2576))
([a554298](googleapis@a554298))

### Bug Fixes

* Improve list locks integration test for postgres
([googleapis#2279](googleapis#2279))
([d9ebe5d](googleapis@d9ebe5d))
* **mcp:** Guard nil SSE session lookup and return 400 for missing
session
([googleapis#2681](googleapis#2681))
([f66189f](googleapis@f66189f))
* **oracle:** Update oracle-execute-sql tool interface to match source
signature
([googleapis#2627](googleapis#2627))
([81699a3](googleapis@81699a3))
* Return AllParams for GetParameter() for tools with
templateParameter([googleapis#2734](googleapis#2734))
([bfd7ba6](googleapis@bfd7ba6))
* **server/mcp:** Scope defer span.End inside loop iteration
([googleapis#2558](googleapis#2558))
([c88a62d](googleapis@c88a62d)),
closes [googleapis#2549](googleapis#2549)
* **skill:** Fix env variable propagation
([googleapis#2645](googleapis#2645))
([5271368](googleapis@5271368))
* **sources/looker:** Looker and looker-dev prebuilt tools should share
one source definition.
([googleapis#2620](googleapis#2620))
([df7f2fd](googleapis@df7f2fd))
* **telemetry:** Histogram buckets from OTel standard to MCP standards
([googleapis#2729](googleapis#2729))
([87cd4a0](googleapis@87cd4a0))
* **ui:** Remove module from script
([googleapis#2703](googleapis#2703))
([6943ab6](googleapis@6943ab6))
* Update toolset attributes naming
([googleapis#2554](googleapis#2554))
([3d6ae4e](googleapis@3d6ae4e))

---
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>
Co-authored-by: Yuan Teoh <45984206+Yuan325@users.noreply.github.com> 39832a0

Author: pull[bot]

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