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feat: add Pi runtime health checks - #467
sara-tadayon-nv merged 8 commits into
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WalkthroughFabric now supports bounded health checks for local Pi runtimes and targeted OpenShell runtimes. The changes add authenticated adapter communication, runtime evidence, lifecycle invalidation, and runtime-server request and report handling. ChangesRuntime health checks
Priority: Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant FabricCheck
participant CheckEnvironment
participant ServeHealth
participant PiAdapterRuntime
FabricCheck->>CheckEnvironment: Request a runtime health check
CheckEnvironment->>ServeHealth: Send an authenticated level request
ServeHealth->>PiAdapterRuntime: Run the requested health check
PiAdapterRuntime-->>ServeHealth: Return adapter health evidence
ServeHealth-->>CheckEnvironment: Return a signed response
CheckEnvironment-->>FabricCheck: Return validated health evidence
Merge Risk:
 |
| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 115 functions across 28 files. (2 skipped… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title follows Conventional Commits format, uses the allowed lowercase type feat, gives an imperative summary, stays under 72 characters, and matches the main change.Description check The description covers the change, key behavior, reviewer starting points, related issues, and both required confirmations. The additional Details section is relevant and does not omit required templa… Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Description check
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Explanation
The description covers the change, key behavior, reviewer starting points, related issues, and both required confirmations. The additional Details section is relevant and does not omit required template information.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 115 functions across 28 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Fern docs preview: https://nvidia-preview-pull-request-467.docs.buildwithfern.com/nemo/fabric |
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Actionable comments posted: 5
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @adapters/README.md:
- Around line 217-221: Move the Pi runtime health paragraph beginning with
“Local Pi runtimes” to after the complete telemetry paragraph, reconnecting the
text ending with “Claude, Codex,” to “Hermes Agent, mini-SWE-agent, and Pi can
emit…”.
Review comments at @adapters/typescript/common/src/lifecycle.ts:
- Line 292: Wrap the serveHealth invocation in the lifecycle serve flow with a
new callAdapterHealth helper, located alongside callAdapter, that converts any
failure into LifecycleError with code lifecycle_health_unavailable and the
specified health-channel message; preserve successful results and ensure the
wrapper call is properly closed.
Review comments at @adapters/typescript/pi/README.md:
- Line 288: Update the prose in the active-state table entry to use the product
name “NeMo Fabric” instead of standalone “Fabric,” preserving the existing
meaning and wording otherwise.
Review comments at @crates/fabric-core/src/check.rs:
- Around line 705-708: Update the check_environment rustdoc to describe server
and runtime health checks, including local runtime adapter probing, OpenShell
sandbox checks for server and runtime requests, and unsupported results for
local server scope and other providers; retain the timeout and ownership-change
behavior. Regenerate the committed API documentation using the project’s docs
generation workflow so the corresponding check_environment pages match the
source documentation.
- Around line 535-541: Merge each collapsible nested if in the affected check
logic: combine the observed_at presence and RFC3339 validation conditions, the
CheckRequest::Runtime pattern and remote_check_agent comparison, and the
bindings match with binding removal. Preserve the existing condition ordering
and bodies, including the early return and state updates.
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📒 Files selected for processing: 44
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Review Python SDK changes for typed API consistency, import-time dependency neutrality, async/session behavior, and parity with the native extension.
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Enforce the product name in user-facing prose: use "NVIDIA NeMo Fabric" on first use and "NeMo Fabric" thereafter.
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examples/openshell_echo/README.mddocs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxadapters/README.mdadapters/typescript/common/README.mdATTRIBUTIONS-Rust.mddocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxadapters/typescript/pi/README.mddocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxREADME.mddocs/reference/api/python-library-reference/nemo_fabric.client.mdsdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/README.mddocs/sdk/python.mdx
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Tests should cover the behavior promised by the changed API surface, including error paths, lifecycle cleanup, and SDK/native parity where relevant.
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adapters/README.mdadapters/typescript/common/README.mdadapters/typescript/pi/README.md
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🧠 Learnings: 1
📚 Learning: 2026-07-24T16:07:22.255Z
Learnt from: AjayThorve
Repo: NVIDIA/NeMo-Fabric PR: 118
File: docs/reference/api/rust-library-reference/nemo-fabric-core/config/struct-adapterdescriptor.mdx:5-5
Timestamp: 2026-07-24T16:07:22.255Z
Learning: In this repo, files generated under `docs/reference/api/**` are NVIDIA NeMo Fabric API reference output. When reviewing changes to these generated pages, do not treat sidebar `position`/ordering updates as direct manual edits—these can be regenerated by running `just docs` after adding public types. Only flag substantive content changes that are not explained by generation.
Applied to files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdx
🪛 ast-grep (0.45.3)
tests/python/test_checks.py
[info] 110-110: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 157-157: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 173-173: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 199-199: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 223-223: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 266-266: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
tests/e2e/test_checks.py
[info] 60-60: use jsonify instead of json.dumps for JSON output
Context: json.dumps(chunk)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 214-214: use jsonify instead of json.dumps for JSON output
Context: json.dumps(report.to_mapping())
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
🪛 Clippy (1.98.1)
crates/fabric-core/src/check.rs
[warning] 535-535: this if statement can be collapsed
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[warning] 641-641: this if statement can be collapsed
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[warning] 677-677: this if statement can be collapsed
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🪛 zizmor (1.30.1)
.github/workflows/ci_python.yml
[warning] 4-462: overly broad permissions (excessive-permissions): default permissions used due to no permissions: block
(excessive-permissions)
[error] 104-104: runtime artifacts potentially vulnerable to a cache poisoning attack (cache-poisoning): omitting package-manager-cache enables caching
(cache-poisoning)
[error] 173-173: runtime artifacts potentially vulnerable to a cache poisoning attack (cache-poisoning): omitting package-manager-cache enables caching
(cache-poisoning)
🔇 Additional comments: 43
adapters/typescript/common/src/index.ts: 1
18-18: LGTM!adapters/typescript/common/src/lifecycle.ts: 1
53-55: LGTM!Also applies to: 315-316, 434-436
adapters/typescript/common/test/health.test.mjs: 1
1-113: LGTM!adapters/typescript/common/README.md: 1
33-44: LGTM!adapters/typescript/pi/pi.fabric-adapter.json: 1
130-130: LGTM!adapters/typescript/pi/src/pi-sdk.ts: 1
23-24: LGTM!Also applies to: 369-369, 387-393, 418-418, 878-895, 907-942, 1227-1228, 1261-1261
adapters/typescript/pi/src/runtime.ts: 1
8-9: LGTM!Also applies to: 31-31, 78-79, 90-91, 182-201
adapters/typescript/pi/test/health.test.mjs: 1
1-265: LGTM!tests/adapters/test_pi_adapter.py: 1
92-92: LGTM!sdk/python/nemo-fabric-adapter-catalog/src/nemo_fabric_adapter_catalog/catalog.json: 1
1891-1897: LGTM!Also applies to: 2111-2111
examples/openshell_echo/README.md: 1
36-36: LGTM!adapters/typescript/scripts/check-package.mjs: 1
27-28: 🎯 Functional CorrectnessThe comparison is order-insensitive. It checks membership with
Set.has()andArray.includes(), so the position ofdist/health.d.tsanddist/health.jscannot makepack:checkfail. No reorder is needed..github/workflows/ci_python.yml: 2
110-115: 🎯 Functional CorrectnessThe dependency-installation concern is refuted.
install-typescript-piinvokesinstall-typescript-contractfirst, and that recipe runsnpm ciin the contract directory. The adapter command includes the workspace root, which contains thefile:../../adapter-contract/typescriptdependency.
103-108: 🔒 Security & PrivacyDo not remove the npm cache for this workflow.
The changed cache steps only build the Pi adapter and run tests. The
build-wheelsjob uploads Python wheels and does not restore the npm cache, so no cache-poisoning path to the uploaded artifact is established.adapters/typescript/common/src/health.ts: 1
132-136: 🩺 Stability & AvailabilityThe collision premise does not hold for Fabric's local runtime path.
start_local_runtimegenerates a new runtime ID, andnew_idcombines a timestamp, process ID, and per-process counter. Fabric then assigns each runtime its ownFABRIC_HOMEdirectory. A stale directory from a crashed host is not reused by the next local runtime. Normal cleanup also removes the directory and endpoint.The
wxflag protects against an unexpected pre-existing file; no change is required for the inspected path.Cargo.toml: 1
28-31: LGTM!ATTRIBUTIONS-Rust.md: 1
13690-13901: LGTM!docs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdx: 1
4-4: The wrong "non-local providers are unsupported" text on this generated page comes from thecheck_environmentrustdoc incrates/fabric-core/src/check.rs. That comment covers the fix. Regenerate this page after the rustdoc is fixed; do not edit it by hand.Also applies to: 14-16
crates/fabric-core/Cargo.toml: 1
18-24: LGTM!crates/fabric-core/src/task_command.rs: 1
19-24: LGTM!crates/fabric-core/src/environment.rs: 1
615-618: LGTM!crates/fabric-core/src/runtime/openshell.rs: 1
34-34: LGTM!Also applies to: 65-82, 190-190, 203-203, 315-315, 402-402, 573-573, 592-592
crates/fabric-core/src/runtime.rs: 1
39-45: LGTM!Also applies to: 951-951, 1273-1273, 1804-1831, 2377-2377
environment-providers/openshell/src/lib.rs: 1
535-543: LGTM!Also applies to: 1248-1253, 1272-1277, 1282-1323, 2219-2241
crates/fabric-core/tests/check.rs: 1
48-53: LGTM!docs/reference/api/python-library-reference/nemo_fabric.client.md: 1
131-131: LGTM!docs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdx: 1
4-12: LGTM!Also applies to: 39-39
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdx: 1
168-168: LGTM!docs/sdk/python.mdx: 1
234-280: LGTM!Also applies to: 282-284
sdk/python/nemo-fabric-runtime/src/nemo_fabric/client.py: 1
97-99: LGTM!README.md: 1
69-69: LGTM!tests/python/test_checks.py: 1
1-272: LGTM!tests/e2e/test_checks.py: 1
1-295: LGTM!tests/python/runtime_server/conftest.py: 1
62-67: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/cli.py: 1
85-88: LGTM!Also applies to: 113-119, 131-132
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/protocol.py: 1
11-11: LGTM!Also applies to: 51-60, 132-142, 274-274
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/health.py: 1
4-13: LGTM!Also applies to: 23-45, 48-60, 63-91
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/state.py: 2
19-20: LGTM!Also applies to: 31-35, 46-46, 76-76, 111-112, 217-272
170-172: 🩺 Stability & AvailabilityThe claimed availability regression is not reachable through the bound transport.
transport.serve.handledoes not cancelRuntimeServer.handlewhen a client disconnects or its deadline expires. During shutdown,self.shutting_downremains true, so later invokes fail withhost_stoppingbefore the runtime-state check. The reportedruntime_unavailableconsequence is therefore not established.sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/transport.py: 1
20-21: LGTM!Also applies to: 38-43, 114-118, 130-165
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/README.md: 1
16-16: LGTM!Also applies to: 41-47
tests/python/runtime_server/test_runtime_checks.py: 1
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Review comments at @adapters/typescript/common/src/lifecycle.ts:
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[info] 111-111: use jsonify instead of json.dumps for JSON output
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[info] 163-163: use jsonify instead of json.dumps for JSON output
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[info] 179-179: use jsonify instead of json.dumps for JSON output
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[info] 205-205: use jsonify instead of json.dumps for JSON output
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Note: [CWE-116] Improper Encoding or Escaping of Output.
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[info] 229-229: use jsonify instead of json.dumps for JSON output
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[info] 272-272: use jsonify instead of json.dumps for JSON output
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🔇 Additional comments: 12
adapters/typescript/common/src/lifecycle.ts: 1
290-303: LGTM!Also applies to: 319-320
adapters/typescript/common/test/lifecycle.test.mjs: 1
6-8: LGTM!Also applies to: 140-166
adapters/typescript/pi/README.md: 1
280-296: LGTM!adapters/README.md: 1
225-229: LGTM!crates/fabric-core/src/check.rs: 2
497-700: LGTM!Also applies to: 702-708, 728-829, 831-1022
1033-1412: LGTM!docs/reference/api/python-library-reference/nemo_fabric.client.md: 1
131-131: LGTM!docs/sdk/python.mdx: 1
234-236: LGTM!Also applies to: 241-254, 257-280, 284-284
docs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdx: 1
39-39: LGTM!docs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdx: 1
4-4: LGTM!Also applies to: 14-16
sdk/python/nemo-fabric-runtime/src/nemo_fabric/client.py: 1
97-99: LGTM!tests/python/test_checks.py: 1
1-278: LGTM!
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Review comments at @adapters/typescript/pi/src/pi-sdk.ts:
- Line 930: Update the tool availability check around the registered Set and
ready validation to use active tool names for required direct tools, rather than
relying on session.getAllTools(). Keep tools callable without being active
handled separately, and preserve readiness for all genuinely available required
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description to scope server responsiveness, agent probing, and the server report
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[info] 112-112: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 164-164: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
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[info] 180-180: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
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[info] 206-206: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
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[info] 230-230: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
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[info] 273-273: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
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tests/e2e/test_checks.py
[info] 61-61: use jsonify instead of json.dumps for JSON output
Context: json.dumps(chunk)
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[info] 215-215: use jsonify instead of json.dumps for JSON output
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Note: [CWE-116] Improper Encoding or Escaping of Output.
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🔇 Additional comments: 15
crates/fabric-core/src/check.rs: 2
494-1013: LGTM!
1025-1404: LGTM!environment-providers/openshell/src/lib.rs: 1
1299-1322: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/state.py: 1
217-270: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/cli.py: 1
85-88: LGTM!Also applies to: 113-119
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/health.py: 1
23-90: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/protocol.py: 1
132-141: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/README.md: 1
16-16: LGTM!Also applies to: 41-43, 47-47
tests/python/runtime_server/test_runtime_checks.py: 1
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14-16: LGTM!docs/sdk/python.mdx: 1
234-279: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/client.py: 1
97-99: LGTM!tests/e2e/test_checks.py: 1
1-292: LGTM!tests/python/test_checks.py: 1
1-279: LGTM!
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Review comments at @adapters/typescript/common/src/health.ts:
- Around line 131-135: Update serveHealth and its close() cleanup to recover
from a stale health.endpoint.json left by an abrupt restart: remove or
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📓 Path-based instructions: 17
Review Python SDK changes for typed API consistency, import-time dependency neutrality, async/session behavior, and parity with the native extension.
⚙️ CodeRabbit configuration file
Files:
sdk/python/nemo-fabric-runtime/src/nemo_fabric/client.pysdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/README.mdsdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/health.py
Review the Rust core for runtime lifecycle correctness, handle validation, capability routing accuracy, schema stability, and error semantics.
⚙️ CodeRabbit configuration file
Files:
crates/fabric-core/src/environment.rscrates/fabric-core/src/check.rs
Review documentation for technical accuracy against the current API, command correctness, and consistency with generated schemas.
⚙️ CodeRabbit configuration file
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxdocs/reference/api/python-library-reference/nemo_fabric.client.mddocs/sdk/python.mdx
Enforce the product name in user-facing prose: use "NVIDIA NeMo Fabric" on first use and "NeMo Fabric" thereafter.
⚙️ CodeRabbit configuration file
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxexamples/openshell_echo/README.mddocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxdocs/reference/api/python-library-reference/nemo_fabric.client.mdadapters/README.mdadapters/typescript/common/README.mdadapters/typescript/pi/README.mddocs/sdk/python.mdxsdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/README.md
Review adapter and example changes for command correctness, config/schema consistency, artifact handling, and compatibility with the public NeMo Fabric contracts.
⚙️ CodeRabbit configuration file
Files:
examples/openshell_echo/README.mdadapters/README.mdadapters/typescript/common/README.mdadapters/typescript/pi/README.mdadapters/typescript/common/src/health.ts
Tests should cover the behavior promised by the changed API surface, including error paths, lifecycle cleanup, and SDK/native parity where relevant.
⚙️ CodeRabbit configuration file
Files:
tests/python/runtime_server/test_runtime_checks.pytests/python/test_checks.py
Source excerpt: Treat all files under `docs/reference/api/` as generated output.
📄 CodeRabbit inference engine (.agents/skills/review-doc-style/SKILL.md)
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxdocs/reference/api/python-library-reference/nemo_fabric.client.md
Source excerpt: Require the user to provide the stable release version in either `.` or `..` form.
📄 CodeRabbit inference engine (.agents/skills/create-rc-tag/SKILL.md)
Files:
Cargo.toml
Source excerpt: Keep `Cargo.toml` `[workspace.dependencies]` self-references aligned when the workspace version changes.
📄 CodeRabbit inference engine (.agents/skills/update-project-version/SKILL.md)
Files:
Cargo.toml
Source excerpt: In MDX files, top-of-file comments must use JSX comment delimiters: `{/*` to open and `*/}` to close.
📄 CodeRabbit inference engine (.agents/skills/contribute-docs/SKILL.md)
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxdocs/sdk/python.mdx
Source excerpt: Treat these as blocking issues: MDX top-of-file SPDX comments use HTML comment delimiters instead of `{/* ...
📄 CodeRabbit inference engine (.agents/skills/review-doc-style/SKILL.md)
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxdocs/sdk/python.mdx
Source excerpt: For links between files under `docs/`, use paths relative to the source file and include the target file's `.mdx` extension.
📄 CodeRabbit inference engine (.agents/skills/review-doc-style/SKILL.md)
Files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdxdocs/reference/api/python-library-reference/nemo_fabric.client.mddocs/sdk/python.mdx
Source excerpt: [ ] Relevant adapter or example `README.md` files updated when examples or adapters have changed.
📄 CodeRabbit inference engine (.agents/skills/contribute-docs/SKILL.md)
Files:
adapters/README.mdadapters/typescript/common/README.mdadapters/typescript/pi/README.md
Applicability reference: AGENTS.md: # AGENTS.md Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (n...
📄 CodeRabbit inference engine (adapters/README.md)
Files:
adapters/typescript/common/README.mdadapters/typescript/pi/README.mdadapters/typescript/common/src/health.ts
Applicability reference: AGENTS.md: # AGENTS.md Keep public bindings current when the API changes: `docs/sdk/python.mdx` for the Python SDK; `adapter-contract/python/` and `adapter-contract/typescript/` for the southbound adapter contract;...
📄 CodeRabbit inference engine (schemas/SCHEMA.md)
Files:
crates/fabric-core/src/environment.rscrates/fabric-core/src/check.rs
Source excerpt: Establish the release branch and target version.
📄 CodeRabbit inference engine (.agents/skills/draft-release-notes/SKILL.md)
Files:
Cargo.toml
Source excerpt: Confirm the target release version from `upstream/main:Cargo.toml`.
📄 CodeRabbit inference engine (.agents/skills/prepare-code-freeze/SKILL.md)
Files:
Cargo.toml
🧠 Learnings: 2
📓 Common learnings
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Configuration Compatibility
### Environment Values And Names
For example, use `env={"LOG_LEVEL": "debug"}` for a literal setting and `env_names=["GITHUB_TOKEN"]` to forward a token already available to the NeMo Fabric process. `environment.env` does not expand `$GITHUB_TOKEN` or `${GITHUB_TOKEN}`, and neither field loads a `.env` file. Refer to [Set Environment Values Or Forward Them By N...
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Configuration Compatibility
"Normalized" means that the adapter accepts the corresponding `FabricConfig`
field. "Not exposed" does not mean that the underlying harness lacks the
feature; it means that NeMo Fabric does not provide a portable configuration
surface for it. Tool values are adapter-native selectors; NeMo Fabric does not
define a cross-harness tool-name catalog. Planning fails w...
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## TypeScript Adapter Packages
OpenCode, Qwen Code, and Kilo Code require HTTPS for remote model endpoints by default. To use a trusted Docker or Kubernetes HTTP gateway, configure `harness.settings.insecure_http_model_hosts` as described in their adapter READMEs. Kilo Code also supports its existing private IPv4 opt-in.
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Configuration Compatibility
### Complete FabricConfig Support
`Core` means NeMo Fabric owns the behavior and applies it uniformly before or around
adapter execution. `Yes` means the adapter translates the normalized field into
its harness. `No` means an explicitly configured value fails planning instead
of being ignored. The following table groups provider-specific Relay subfields
and add...
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Descriptor Discovery
Identical records with the same ID are deduplicated and retain every source as
provenance. Different records with the same ID fail as ambiguous; discovery
does not merge fields or choose an override. Workflow entry points and settings
schemas come from independently registered Adapter Target Descriptors.
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Runtime and Observability Compatibility
Telemetry output names use the descriptor contract values. Claude, Codex,
Hermes Agent, mini-SWE-agent, and Pi can emit NeMo Relay ATIF, OpenTelemetry, and
OpenInference output. Deep Agents supports the same Relay outputs plus native
OpenTelemetry and OpenInference; Codex also supports native OpenTelemetry. The
Remote Agent adapter maps the request I...
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Runtime and Observability Compatibility
All bundled adapters use a language-specific persistent adapter host with an
ordered `start` → `invoke*` → `stop` protocol.
Learnt from: CR
Repo: NVIDIA/NeMo-Fabric
Timestamp: 2026-10-21T21:32:04.255Z
Learning: Applicability reference:
AGENTS.md: # AGENTS.md
## Documentation And Contribution Workflow
- Update user-facing entry points when public behavior, the `nemo-fabric` package (imported as `nemo_fabric`), examples, or supported bindings change: `README.md`, the Fern docs under `docs/` (navigation in `docs/index.yml`, site config in `fern/docs.yml`), and the adapter/integration READMEs (`adapters/README.md`, `adapters/*/README.md`, `adapters/*/*/README.md`, `sdk/python/nemo-fabric-runtime/src/nemo_fabric/integrations/*/README.md`, `examples/README.md`).
Source excerpt:
# NVIDIA NeMo Fabric Adapters
## Configuration Compatibility
### Complete FabricConfig Support
The selected model role is `default`, or the sole configured role when no
`default` exists. More than one role without `default` fails planning.
All bundled adapters except Hermes publish a descriptor-owned `model_schema`
for every configured model role. The Claude and Codex native providers
(`anthropic` and `openai`, respectiv...
📚 Learning: 2026-07-24T16:07:22.255Z
Learnt from: AjayThorve
Repo: NVIDIA/NeMo-Fabric PR: 118
File: docs/reference/api/rust-library-reference/nemo-fabric-core/config/struct-adapterdescriptor.mdx:5-5
Timestamp: 2026-07-24T16:07:22.255Z
Learning: In this repo, files generated under `docs/reference/api/**` are NVIDIA NeMo Fabric API reference output. When reviewing changes to these generated pages, do not treat sidebar `position`/ordering updates as direct manual edits—these can be regenerated by running `just docs` after adding public types. Only flag substantive content changes that are not explained by generation.
Applied to files:
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdxdocs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdx
🪛 ast-grep (0.45.3)
tests/python/test_checks.py
[info] 112-112: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 164-164: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 180-180: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 206-206: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 230-230: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 273-273: use jsonify instead of json.dumps for JSON output
Context: json.dumps(check_report)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
🔇 Additional comments: 18
Cargo.toml: 1
28-31: LGTM!adapters/typescript/common/src/health.ts: 1
24-122: LGTM!Also applies to: 136-148
adapters/typescript/common/README.md: 1
33-41: LGTM!adapters/README.md: 1
225-228: LGTM!adapters/typescript/pi/README.md: 1
280-292: LGTM!crates/fabric-core/src/check.rs: 1
4-24: LGTM!Also applies to: 494-536, 549-703
crates/fabric-core/src/environment.rs: 1
614-617: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/health.py: 1
4-4: LGTM!Also applies to: 12-13
sdk/python/nemo-fabric-runtime/src/nemo_fabric/runtime_server/README.md: 1
16-16: LGTM!Also applies to: 41-47
tests/python/runtime_server/test_runtime_checks.py: 1
1-200: LGTM!docs/reference/api/python-library-reference/nemo_fabric.client.md: 1
131-131: LGTM!docs/reference/api/rust-library-reference/nemo-fabric-core/check/fn-check-environment.mdx: 1
4-4: LGTM!Also applies to: 14-16
docs/reference/api/rust-library-reference/nemo-fabric-core/check/index.mdx: 1
4-4: LGTM!Also applies to: 12-12, 39-39
docs/reference/api/rust-library-reference/nemo-fabric-core/index.mdx: 1
168-168: LGTM!docs/sdk/python.mdx: 1
234-275: LGTM!Also applies to: 278-278
examples/openshell_echo/README.md: 1
36-36: LGTM!sdk/python/nemo-fabric-runtime/src/nemo_fabric/client.py: 1
96-98: LGTM!tests/python/test_checks.py: 1
1-279: LGTM!
sara-tadayon-nv
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Approved as part of the health-check stack review, subject to the fix requested in #466 before merging the stack.
Tested the stack tip on macOS and Linux: 295 Rust tests, focused Python health suites (397 macOS / 328 Linux), and TypeScript unit, dependency, and package-install checks.
Also verified real Pi busy/timeout recovery, native OpenClaw 2026.9.4 service/runtime health, and real OpenShell server health with both sandbox ownership modes.
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Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
The Python health checks start the TypeScript Pi host from a clean checkout. Build the contract, common host, and Pi adapter in the Python matrix and Relay 0.9 compatibility job before pytest. Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
Signed-off-by: Sara Tadayon <stadayon@nvidia.com>
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Overview
Extend
Fabric.check()with runtime health checks and implement Pi support. Callers can inspect one exact runtime while an invocation continues.Details
livechecks native session liveness; busy sessions can pass.activealso checks completed extension binding and an available request interface.readyalso checks the configured model, required tool registration, and observed Model Context Protocol connection state.fabric-agent-ctl checkcommands.Where should the reviewer start?
Start with
PiAdapterRuntime.check()andPiSdkSessionHandle.check()in the Pi adapter, thencrates/fabric-core/src/check.rsandtests/e2e/test_checks.py.Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)
Relates to https://linear.app/nvidia/issue/FABRIC-364
Relates to feat: add runtime server health checks #466; this PR is stacked on the server checks.
Relates to fabric-agent-ctl: read-only status command for the owned runtime #420
I confirm this contribution is my own work, or I have the right to submit it under this project's license.
I searched existing issues and open pull requests, and this does not duplicate existing work.
Summary by CodeRabbit
New Features
live,active, andreadylevels.Documentation