diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1477978..ee644a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,26 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.2.0] - 2026-04-20
+
+### Added
+- **`agent_context()`**: new context manager for OTel GenAI semantic-convention
+  agent identity attributes (`gen_ai.agent.id`, `gen_ai.agent.name`,
+  `gen_ai.agent.description`, `gen_ai.agent.version`). All spans created inside
+  the context are auto-tagged by `Last9SpanProcessor`, matching the shape
+  OpenAI Agents SDK and `autogen-core` emit natively on their own agent spans.
+- `agent_context` composes with `conversation_context()` and
+  `workflow_context()`; covered by tests for triple-nesting, multi-agent
+  handoff (same conversation), inner-overrides-outer, and mixed-exit order.
+
+### Notes
+- `agent_name` is the only required argument (per OTel semconv).
+  `agent_id` / `agent_description` / `agent_version` are optional.
+- Native-instrumented agent spans (e.g. AutoGen's `invoke_agent`,
+  OpenAI Agents SDK) set `gen_ai.agent.*` directly inside the span body and
+  will override values from `agent_context`. Sibling and child spans still
+  receive `agent_context`'s values.
+
 ## [1.1.0] - 2026-04-20
 
 ### Added
diff --git a/last9_genai/__init__.py b/last9_genai/__init__.py
index 470d474..b2073b6 100644
--- a/last9_genai/__init__.py
+++ b/last9_genai/__init__.py
@@ -34,7 +34,7 @@
 For more information, see: https://github.com/last9/python-ai-sdk
 """
 
-__version__ = "1.1.0"
+__version__ = "1.2.0"
 __author__ = "Last9 Inc."
 __license__ = "MIT"
 
diff --git a/pyproject.toml b/pyproject.toml
index 33acb41..6ad2a82 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "last9-genai"
-version = "1.1.0"
+version = "1.2.0"
 description = "Last9 observability attributes for OpenTelemetry GenAI spans - track costs, workflows, and conversations in LLM applications"
 readme = "README.md"
 license = "MIT"
diff --git a/setup.py b/setup.py
index c61c4bd..d43e2cf 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
 
 setup(
     name="last9-genai",
-    version="1.1.0",
+    version="1.2.0",
     author="Last9 Inc.",
     author_email="hello@last9.io",
     description="Last9 observability attributes for OpenTelemetry GenAI spans",
diff --git a/uv.lock b/uv.lock
index d33ead5..f4343ad 100644
--- a/uv.lock
+++ b/uv.lock
@@ -794,7 +794,7 @@ wheels = [
 
 [[package]]
 name = "last9-genai"
-version = "1.1.0"
+version = "1.2.0"
 source = { editable = "." }
 dependencies = [
     { name = "opentelemetry-api" },