…ql source (#1927)

### Description

This pull request addresses issue #41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** #41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

…ql source (#1927)

### Description

This pull request addresses issue #41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** #41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

…ql source (googleapis#1927)

### Description

This pull request addresses issue googleapis#41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** googleapis#41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

…ql source (googleapis#1927)

### Description

This pull request addresses issue googleapis#41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** googleapis#41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

…ql source (googleapis#1927)

### Description

This pull request addresses issue #41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** #41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

…ql source (googleapis#1927)

### Description

This pull request addresses issue #41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** #41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

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


##
[0.20.0](v0.19.1...v0.20.0)
(2025-11-14)


### Features

* Added prompt support for toolbox
([#1798](#1798))
([cd56ea4](cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([#1588](#1588))
([12bdd95](12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([#1922](#1922))
([2c228ef](2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([#1927](#1927))
([7e6e88a](7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([#1877](#1877))
([ef63860](ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([#1912](#1912))
([a4c9287](a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([#1765](#1765))
([897c63d](897c63d))

---
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>

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

##
[0.20.0](v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([#1798](#1798))
([cd56ea4](cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([#1588](#1588))
([12bdd95](12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([#1922](#1922))
([2c228ef](2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([#1927](#1927))
([7e6e88a](7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([#1877](#1877))
([ef63860](ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([#1912](#1912))
([a4c9287](a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([#1765](#1765))
([897c63d](897c63d))

---
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> 5156db2

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

##
[0.20.0](v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([#1798](#1798))
([cd56ea4](cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([#1588](#1588))
([12bdd95](12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([#1922](#1922))
([2c228ef](2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([#1927](#1927))
([7e6e88a](7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([#1877](#1877))
([ef63860](ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([#1912](#1912))
([a4c9287](a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([#1765](#1765))
([897c63d](897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

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

##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)

### Features

* Added prompt support for toolbox
([googleapis#1798](googleapis#1798))
([cd56ea4](googleapis@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([googleapis#1588](googleapis#1588))
([12bdd95](googleapis@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([googleapis#1922](googleapis#1922))
([2c228ef](googleapis@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([googleapis#1927](googleapis#1927))
([7e6e88a](googleapis@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([googleapis#1877](googleapis#1877))
([ef63860](googleapis@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([googleapis#1912](googleapis#1912))
([a4c9287](googleapis@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([googleapis#1765](googleapis#1765))
([897c63d](googleapis@897c63d))

---
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> 5156db2

#1927)

### Description

This pull request addresses issue #41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed  
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a  
  bug/issue  
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change



🛠️ **Fixes** #41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com>

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


##
[0.20.0](v0.19.1...v0.20.0)
(2025-11-14)


### Features

* Added prompt support for toolbox
([#1798](#1798))
([cd56ea4](cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([#1588](#1588))
([12bdd95](12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([#1922](#1922))
([2c228ef](2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([#1927](#1927))
([7e6e88a](7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([#1877](#1877))
([ef63860](ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([#1912](#1912))
([a4c9287](a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([#1765](#1765))
([897c63d](897c63d))

---
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>

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


##
[0.20.0](googleapis/mcp-toolbox@v0.19.1...v0.20.0)
(2025-11-14)


### Features

* Added prompt support for toolbox
([#1798](googleapis/mcp-toolbox#1798))
([cd56ea4](googleapis/mcp-toolbox@cd56ea4))
* **source/alloydb,
source/cloud-sql-postgres,source/cloud-sql-mysql,source/cloud-sql-mssql:**
Use project from env for alloydb and cloud sql control plane tools
([#1588](googleapis/mcp-toolbox#1588))
([12bdd95](googleapis/mcp-toolbox@12bdd95))
* **source/mysql:** Set default host and port for MySQL source
([#1922](googleapis/mcp-toolbox#1922))
([2c228ef](googleapis/mcp-toolbox@2c228ef))
* **source/Postgresql:** Set default host and port for Postgresql source
([#1927](googleapis/mcp-toolbox#1927))
([7e6e88a](googleapis/mcp-toolbox@7e6e88a))
* **tool/looker-generate-embed-url:** Adding generate embed url tool
([#1877](googleapis/mcp-toolbox#1877))
([ef63860](googleapis/mcp-toolbox@ef63860))
* **tools/postgres:** Add `list_triggers`, `database_overview` tools for
postgres
([#1912](googleapis/mcp-toolbox#1912))
([a4c9287](googleapis/mcp-toolbox@a4c9287))
* **tools/postgres:** Add list_indexes, list_sequences tools for
postgres
([#1765](googleapis/mcp-toolbox#1765))
([897c63d](googleapis/mcp-toolbox@897c63d))

---
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>