Align gen_ai.tool_definitions with JSON Schema and add it to completion hook (#4181)

* add gen_ai.tool_definitions to completion hook

* hash tool defintions

* Update CHANGELOG

* make tool.defintions optional in on_completion

* fix lint errors

* add gen_ai.tool_definitions to completion hook

* hash tool defintions

* fix CompetionHook docstring

* fix lint test

* add gen_ai.tool_definitions to completion hook

* hash tool defintions

* Update CHANGELOG

* align tool.defintions with JSON schema

* fix tests

* fix ruff

* fix unexpected indent

* use local changes from util/opentelemetry-util-genai

* fix ruff

* add gen_ai.tool_definitions to completion hook

* re-add changes lost during merge

* put tool.defintions in the telemetry by default and the params behind the flag

* fix: Too many local variables

* address comments

* Add comments to udpate of util-genai version after release

---------

Co-authored-by: Aaron Abbott <aaronabbott@google.com>

Author: wikaaaaa

instrumentation-genai/opentelemetry-instrumentation-google-genai/CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 - Fix bug in how tokens are counted when using the streaming `generateContent` method.  ([#4152](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4152)).
 - Add `gen_ai.tool.definitions` attribute to `gen_ai.client.inference.operation.details` log event ([#4142](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4142)).
+- Add `gen_ai.tool_definitions` to completion hook ([#4181](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4181))
+
 
 ## Version 0.6b0 (2026-01-27)
 

instrumentation-genai/opentelemetry-instrumentation-google-genai/pyproject.toml

@@ -42,7 +42,7 @@ dependencies = [
   "opentelemetry-api ~=1.37",
   "opentelemetry-instrumentation >=0.58b0, <2",
   "opentelemetry-semantic-conventions >=0.58b0, <2",
-  "opentelemetry-util-genai >= 0.2b0, <0.3b0",
+  "opentelemetry-util-genai >= 0.2b0, <0.3b0", # TODO: update version after release (https://github.com/open-telemetry/opentelemetry-python-contrib/issues/4221)
 ]
 
 [project.optional-dependencies]