fix(runner): make RunnerContext.get_env() read live from os.environ

[bobbravo2]

Summary

This is a followup PR to ensure that #726 data is pushed to Langfuse for product instrumentation

• Fix stale environment snapshot in RunnerContext: get_env() was reading from a frozen dict captured once at construction. Runtime mutations to os.environ (by POST /workflow, POST /repos/add, auth refresh) were invisible to any code using context.get_env().
• Root cause: __post_init__ merged os.environ into self.environment and get_env() read only from that dict. The context is never recreated — mark_dirty() resets the bridge but reuses the same stale context.
• Fix: Store explicit constructor overrides in _overrides. get_env() now checks overrides first, then falls through to live os.environ. self.environment remains populated for backward compatibility.

Changes

File	Change
ambient_runner/platform/context.py	Store _overrides in __post_init__; get_env() reads live from os.environ with overrides winning
tests/test_context.py	Regression tests: runtime mutation visibility + override precedence

Test plan

• New test_get_env_sees_os_environ_mutations_after_creation — creates context, mutates os.environ after, asserts get_env() returns mutated value
• New test_explicit_overrides_win_over_os_environ — constructor overrides take precedence even after os.environ mutation
• All 73 existing tests pass without modification (test_context, test_bridge_claude, test_observability)
• CI green

Made with Cursor

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 93c08729-5727-45a1-9881-bd328976dd46

📥 Commits

Reviewing files that changed from the base of the PR and between 9ca461a and 935dd40.

📒 Files selected for processing (2)

• components/runners/ambient-runner/ambient_runner/platform/context.py
• components/runners/ambient-runner/tests/test_context.py

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Walkthrough

RunnerContext now stores constructor-provided environment overrides in an internal _overrides dict. get_env returns override values when present; for keys without overrides it reads current values from os.environ, so external environment mutations after context creation are visible for non-overridden keys.

Changes

Cohort / File(s)	Summary
RunnerContext override behavior components/runners/ambient-runner/ambient_runner/platform/context.py	Added internal _overrides storage for explicit environment overrides. get_env now returns stored overrides when present and otherwise reads live values from os.environ. Docstrings updated to describe new behavior.
RunnerContext get_env tests components/runners/ambient-runner/tests/test_context.py	Added tests verifying that get_env reflects os.environ mutations for non-overridden keys and that constructor-provided overrides take precedence over os.environ, including after environment changes.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: making RunnerContext.get_env() read live from os.environ instead of from a stale snapshot.
Description check	✅ Passed	The description is directly related to the changeset, explaining the root cause, the fix, files changed, and test plan for the stale environment snapshot issue in RunnerContext.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/stale-runnercontext-env

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@components/runners/ambient-runner/ambient_runner/platform/context.py`:
- Around line 31-33: The bridge is still reading stale merged environment via
direct access to self._context.environment; update any reads in the LangGraph
bridge (where it reads LANGGRAPH_URL, LANGGRAPH_GRAPH_ID, LANGSMITH_API_KEY from
self._context.environment) to use the context's get_env() method (or the helper
in ambient_runner.platform.utils) instead so runtime-updated env vars are
respected; search for occurrences of self._context.environment in the bridge (or
the symbols LANGGRAPH_URL/LANGGRAPH_GRAPH_ID/LANGSMITH_API_KEY) and replace
those direct dict reads with self._context.get_env().get(...) or the utils
helper.
- Around line 32-39: get_env currently assumes self._overrides exists which
fails for objects created via object.__new__; update get_env (in the
RunnerContext / ambient_runner.platform.context module) to first check for the
presence of _overrides (e.g. via hasattr(self, "_overrides")) and if absent fall
back to using self.environment for override lookup, or ensure _overrides is
initialized (empty dict) before use; specifically modify get_env to return
self._overrides[key] when _overrides exists, otherwise check self.environment
for the key and then return os.environ.get(key, default).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 26a13632-9ea2-4df9-9a7c-ae0e5bd01483

📥 Commits

Reviewing files that changed from the base of the PR and between 744c0d4 and 9ca461a.

📒 Files selected for processing (2)

• components/runners/ambient-runner/ambient_runner/platform/context.py
• components/runners/ambient-runner/tests/test_context.py

[Gkrumbach07]

Can you fix unit tests

[bobbravo2]

Can you fix unit tests

Pushed!

Problem was: "The issue was that test_claude_auth.py has a _make_context() helper that uses object.new(RunnerContext) to bypass post_init, so _overrides was never set. The fix adds a getattr guard: when _overrides is absent (bypassed init), get_env() falls back to the old behavior of reading only from self.environment. When _overrides is present (normal construction), it checks overrides first, then reads live from os.environ."

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-03-11 20:07 UTC · Rule: default
• ✅ Checks passed · on draft merge queue: embarking main (f4c5cb5) and #885 together #887
• ✅ Merged — 2026-03-11 20:08 UTC · at 935dd400dfed70a2ab8adc0d09abe52528b253e8

This pull request spent 19 seconds in the queue, including 5 seconds running CI.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub repository ruleset rule protect-main]
  • fix(runner): make RunnerContext.get_env() read live from os.environ #885
• #changes-requested-reviews-by = 0 [🛡 GitHub repository ruleset rule protect-main]
  • fix(runner): make RunnerContext.get_env() read live from os.environ #885