feat: Misc MCP improvements - #177
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…d), run discover_mcp_tools in a loop Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
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WalkthroughThe adapters now map stdio MCP servers from separate command, argument, and environment fields. Hermes performs MCP discovery and shutdown asynchronously. Mock API streaming support and end-to-end tests cover enabled and disabled MCP servers. ChangesMCP stdio transport
Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant E2ETest
participant Adapter
participant MultiServerMCPClient
participant TimeMCPServer
participant MockAPI
E2ETest->>MockAPI: Configure model response
E2ETest->>Adapter: Run MCP-enabled request
Adapter->>MultiServerMCPClient: Pass command, args, and env
MultiServerMCPClient->>TimeMCPServer: Start stdio server
Adapter->>MockAPI: Send tool-enabled request
MockAPI-->>Adapter: Stream tool-call events
Adapter->>TimeMCPServer: Invoke get_current_time
TimeMCPServer-->>Adapter: Return tool result
Adapter->>MockAPI: Submit tool result
MockAPI-->>Adapter: Stream final response
Possibly related PRs
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (3 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Fern docs preview: https://nvidia-preview-pull-request-177.docs.buildwithfern.com/nemo/fabric |
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Actionable comments posted: 4
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@adapters/codex/src/nemo_fabric_adapters/codex/adapter.py`:
- Around line 191-192: Validate the MCP server env field as a string-to-string
mapping before forwarding it: in
adapters/codex/src/nemo_fabric_adapters/codex/adapter.py:191-192 and
adapters/claude/src/nemo_fabric_adapters/claude/adapter.py:307-308, use _mapping
with the field-specific name “MCP server {name} env” and reject non-string keys
or values before assignment; in
adapters/deepagents/src/nemo_fabric_adapters/deepagents/adapter.py:293-294,
raise AdapterConfigError naming the server for any non-mapping or non-string
entry before assigning connection["env"]. Add rejection coverage for a
non-mapping env alongside the positive adapter tests.
In `@adapters/hermes/pyproject.toml`:
- Around line 34-40: Document the rationale for the hermes-agent dependency in
the relevant PR or packaging documentation, covering its functional need,
alternatives considered, and why the >=0.19.0 constraint is the narrowest fit.
Ensure the rationale applies consistently to both the relay and full extras.
In `@tests/e2e/test_claude.py`:
- Around line 182-191: Replace the blocking requests.post scenario setup in
tests/e2e/test_claude.py lines 182-191, tests/e2e/test_codex.py lines 29-39, and
tests/e2e/test_deepagents.py lines 116-125 with non-blocking httpx.AsyncClient
calls inside the async tests, preserving the namespace field in the Codex
request body. Remove the now-unused requests imports from all three files and
verify httpx is available as a test dependency.
- Around line 201-207: Ensure the test setup for mcp_server_time is reliable by
confirming mcp-server-time is declared in the test dependencies; if it is
optional or unavailable, add an importorskip guard near the test module setup
before config.add_mcp_server is used. Preserve the existing server configuration
and ensure missing-module cases skip cleanly rather than failing assertions.
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adapters/**/*.{py,js,ts,java,go,rs}: Use the existing Fabricpythonorprocessrunner and normalized request/result contracts. Reuseadapters/common/only when its contract fits; do not add a runner or abstraction for one adapter.
For adapters consuming normalized configuration or runtime context, use the complete Fabric invocation and treatconfig,capability_plan,telemetry_plan, andruntime_contextas authoritative. Reserveharness.settingsfor harness-specific behavior.
Apply configuration precedence in this order: normalized config; Fabric-resolved plans and runtime context; harness-specific settings; descriptor and adapter defaults. Reject conflicting duplicate declarations or unsupported behavior with actionable field-specific errors; never silently drop configuration.
Run dependency and authentication preflight before invoking the harness. Declare fixed dependencies in descriptor requirements, validate versions, hooks, and credentials, and never expose credential values in output, errors, events, logs, or fixtures.
Forward only required system variables, selected credential variables, telemetry variables, and documented harness-specific environment; never forward or log unrelated environment values.
Run one local adapter host per Fabric runtime for orderedstart→invoke*→stop. Emit one JSON lifecycle response per request on stdout and diagnostics on stderr; treat early exit as a host crash.
Return harness-level invoke failures in a successful lifecycle response withresponse: null,failed: true, and structurederrorcontainingcode,message,retryable, and optionalmetadata.
Do not emit NeMo Relay stream records on adapter stdout. Relay records are sent out of band through the SDK-owned NDJSON ATOF endpoint; the adapter must return exactly one terminal lifecycle response.
Scope workspace, generated configuration, state, sessions, and artifacts to the resolved runtime context. Write artifacts only within the resolved r...
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.pyadapters/deepagents/src/nemo_fabric_adapters/deepagents/adapter.pyadapters/claude/src/nemo_fabric_adapters/claude/adapter.pyadapters/codex/src/nemo_fabric_adapters/codex/adapter.py
🧠 Learnings (1)
📚 Learning: 2026-07-09T22:28:51.689Z
Learnt from: AjayThorve
Repo: NVIDIA/NeMo-Fabric PR: 43
File: adapters/claude-sdk/src/nemo_fabric_adapters/claude_sdk/adapter.py:164-168
Timestamp: 2026-07-09T22:28:51.689Z
Learning: In the NeMo-Fabric adapters, treat path values used in Fabric adapter configuration (including logic like `_resolve_path` in adapter.py) as config-root-relative. Do not apply `Path.expanduser()` (or otherwise apply `~`/home or shell-style expansion), because it will make the resolved paths normalize inconsistently across adapters. Also, do not rely on or add any resolution behavior that uses `harness.settings.cwd` as an override point for these adapter paths—`harness.settings.cwd` is explicitly unsupported in this adapter context.
Applied to files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.pyadapters/deepagents/src/nemo_fabric_adapters/deepagents/adapter.pyadapters/claude/src/nemo_fabric_adapters/claude/adapter.pyadapters/codex/src/nemo_fabric_adapters/codex/adapter.py
🪛 ast-grep (0.45.0)
tests/e2e/test_claude.py
[warning] 181-190: Request-controlled URL passed to requests; validate against an allowlist to prevent SSRF.
Context: requests.post(
f"{api_server}/_scenario",
json={
"tool_call": {
"name": tool_name,
"arguments": {"timezone": "America/Los_Angeles"},
}
},
timeout=5,
)
Note: [CWE-918] Server-Side Request Forgery (SSRF).
(ssrf-requests)
tests/e2e/test_codex.py
[warning] 28-38: Request-controlled URL passed to requests; validate against an allowlist to prevent SSRF.
Context: requests.post(
f"{api_server}/_scenario",
json={
"tool_call": {
"name": tool_name,
"namespace": "mcp__mcp_server_time",
"arguments": {"timezone": "America/Los_Angeles"},
}
},
timeout=5,
)
Note: [CWE-918] Server-Side Request Forgery (SSRF).
(ssrf-requests)
tests/_utils/mock_api_server.py
[info] 356-356: use jsonify instead of json.dumps for JSON output
Context: json.dumps(tool_call["arguments"])
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 499-499: use jsonify instead of json.dumps for JSON output
Context: json.dumps(event)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 505-505: use jsonify instead of json.dumps for JSON output
Context: json.dumps(tool_call["arguments"])
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
[info] 576-576: use jsonify instead of json.dumps for JSON output
Context: json.dumps(event)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
tests/e2e/test_deepagents.py
[warning] 115-124: Request-controlled URL passed to requests; validate against an allowlist to prevent SSRF.
Context: requests.post(
f"{api_server}/_scenario",
json={
"tool_call": {
"name": tool_name,
"arguments": {"timezone": "America/Los_Angeles"},
}
},
timeout=5,
)
Note: [CWE-918] Server-Side Request Forgery (SSRF).
(ssrf-requests)
🪛 Ruff (0.16.1)
adapters/deepagents/src/nemo_fabric_adapters/deepagents/adapter.py
[warning] 284-286: Avoid specifying long messages outside the exception class
(TRY003)
tests/e2e/test_claude.py
[warning] 182-182: Async functions should not call blocking HTTP methods
(ASYNC210)
tests/e2e/test_codex.py
[warning] 29-29: Async functions should not call blocking HTTP methods
(ASYNC210)
tests/_utils/mock_api_server.py
[warning] 138-138: Missing return type annotation for private function responses
(ANN202)
[warning] 165-165: Missing return type annotation for private function messages
(ANN202)
tests/e2e/test_deepagents.py
[warning] 116-116: Async functions should not call blocking HTTP methods
(ASYNC210)
🔇 Additional comments (11)
adapters/codex/src/nemo_fabric_adapters/codex/adapter.py (1)
187-190: 🗄️ Data Integrity & IntegrationConfirm
common_utils.normalize_listsemantics forargs.All three adapters now depend on
normalize_listto coerceargs. Confirm the helper exists innemo-fabric-adapters-common0.2.0, and confirm how it treats a bare string and non-string elements. If it splits or stringifies a bare string, a config that setsargs: "--root ."produces one argument instead of two, and the previousshlexbehavior silently changes shape.#!/bin/bash # Locate and print normalize_list plus its tests. fd -t f 'utils.py' adapters/common | xargs -r rg -n -C 12 'def normalize_list' rg -n -C 6 'normalize_list' --glob '*.py' -g '!**/node_modules/**'tests/adapters/test_claude_adapter.py (1)
197-199: LGTM!Also applies to: 242-247
tests/adapters/test_codex_adapter.py (1)
287-296: LGTM!Also applies to: 320-328
tests/adapters/test_deepagents.py (1)
607-628: LGTM!tests/_utils/mock_api_server.py (2)
366-367: 🗄️ Data Integrity & IntegrationConfirm the Codex SDK accepts a
namespacekey on afunction_callitem.
namespaceis not a field in the OpenAI Responsesfunction_callschema. The Codex e2e test sets it and then assertstool_events[0]["server"] == "mcp_server_time", so the server attribution must come from somewhere. Confirm that the Codex SDK readsnamespace, and not amcp__<server>__<tool>prefix onname. If the SDK validates output items strictly, an unknown key can make it reject the item and the test will fail for an unrelated reason.#!/bin/bash # Find how Codex attributes an MCP tool call to a server. rg -n -C 5 'mcpToolCall' --glob '*.py' rg -n -C 4 '\bnamespace\b' adapters/codex tests/e2e/test_codex.py tests/_utils/mock_api_server.py
503-577: LGTM!tests/e2e/test_claude.py (1)
218-242: LGTM!tests/adapters/test_adapter_package_metadata.py (1)
54-54: LGTM!tests/adapters/test_hermes_adapter.py (1)
513-513: LGTM!adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py (2)
306-309: 🩺 Stability & AvailabilityConfirm that MCP discovery does not run while
redirect_stdoutis active.If
startwraps this await in the redirection scope, move the await outside it or use local output capture. Add a regression test for concurrent stdout output.
306-309: 🩺 Stability & AvailabilityConfirm the cancellation path before cleanup. If
startcancellation leavesdiscover_mcp_tools()running inasyncio.to_thread, coordinate its completion beforeshutdown_mcp_servers()and add a regression test.
Signed-off-by: David Gardner <dagardner@nvidia.com>
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⚠️ Outside diff range comments (1)
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py (1)
306-309: 🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy liftSerialize MCP discovery and shutdown across cancellation.
When
start()is canceled duringdiscover_mcp_tools, its cleanup callsstop()while the executor thread still runs discovery. Track and drain discovery beforeshutdown_mcp_servers()runs.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py` around lines 306 - 309, Serialize MCP discovery and shutdown in adapter.py: track the awaitable or task created around discover_mcp_tools in start() so cancellation can await its completion before cleanup proceeds. Update stop() at lines 507-511 to drain any in-progress discovery before calling shutdown_mcp_servers(), preserving safe ordering across cancellation.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Outside diff comments:
In `@adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py`:
- Around line 306-309: Serialize MCP discovery and shutdown in adapter.py: track
the awaitable or task created around discover_mcp_tools in start() so
cancellation can await its completion before cleanup proceeds. Update stop() at
lines 507-511 to drain any in-progress discovery before calling
shutdown_mcp_servers(), preserving safe ordering across cancellation.
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📓 Path-based instructions (12)
**/*.{rs,py,pyi,json,yaml,yml}
📄 CodeRabbit inference engine (.agents/skills/contribute-api/SKILL.md)
Determine and update every affected public surface, including the CLI, PyO3 bindings, Python SDK, type stubs, schemas, and adapter contract, so they remain in parity.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*
📄 CodeRabbit inference engine (.agents/skills/karpathy-guidelines/SKILL.md)
**/*: Before implementing, explicitly state assumptions, surface ambiguity and tradeoffs, present multiple interpretations when relevant, and ask for clarification rather than silently deciding or proceeding when requirements are unclear.
Prefer the minimum code needed to solve the requested problem: avoid speculative features, unnecessary abstractions, unrequested flexibility, and handling of impossible scenarios; simplify overcomplicated solutions.
When editing existing code, make surgical changes only: do not modify unrelated code, comments, formatting, or pre-existing dead code; match the existing style, and remove only unused imports, variables, or functions introduced by your changes.
Define verifiable success criteria for each task, such as writing regression tests for bugs and invalid-input tests for validation, then verify the implementation against those criteria. For multi-step work, state a brief plan with a verification check for each step.
**/*: Always spellNVIDIAin all caps; do not useNvidia,nvidia,nVidia,nVIDIA, orNV.
Usean NVIDIAbefore a noun, because the name begins with an “en” sound.
Do not add a registered trademark symbol afterNVIDIAwhen referring to the company; use trademark symbols with product names only when required by the document type or legal guidance.
Verify official capitalization, spacing, hyphenation, and spelling for NVIDIA and third-party product names; do not rewrite official product names for grammar or title-case rules.
Precede NVIDIA product names withNVIDIAon first mention when natural and accurate, and link the first mention when the destination helps the reader.
On first use, include the company name and full model qualifier when it helps identify the model; preserve official capitalization and punctuation, and use shorter family names only after establishing the full name.
For learning-oriented and developer content, do not force trademark symbols unless explicitly required; for press, ...
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{rs,py}
📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)
For native binding changes, run
cargo check -p fabric-python --locked.Use
snake_casefor functions and variables; usePascalCasefor Rust types and Python classes.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{py,pyi}
📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)
If Python code or a Python-facing adapter changes, run
just test-python.In Python SDK, adapters, examples, and tests, follow the existing style, use type annotations for public APIs, and keep native binding declarations synchronized with their Rust implementations.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{rs,py,pyi}
📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)
**/*.{rs,py,pyi}: If public configuration types change, confirm schema snapshot tests injust test-rustpass and review generated schema diffs.
For schema or public contract changes, run both language suites and review changes underschemas/and generated API references.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{py,pyi,rs}
📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)
For Python SDK or PyO3 binding changes, use
python-tests, run focused pytest tests first, thenjust test-python; rebuild withjust build-pythonwhen native code or packaging changes.Public contract changes must keep native Python binding declarations synchronized with their Rust implementations.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{rs,py,toml}
📄 CodeRabbit inference engine (.agents/skills/update-project-version/SKILL.md)
When editing version helpers, verify every
nemo-fabric-*workspace package through Cargo metadata and reject a static version inpython/pyproject.toml.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{toml,rs,py}
📄 CodeRabbit inference engine (.agents/skills/update-project-version/SKILL.md)
Avoid blind repository-wide replacement of version-like strings; distinguish package-version references from examples and unrelated dependency versions.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
**/*.{md,mdx,yml,py,rs,sh}
📄 CodeRabbit inference engine (.agents/skills/review-doc-style/SKILL.md)
Keep documentation aligned with current NeMo Fabric behavior, repository layout, entry points, commands, package names, APIs, bindings, and support claims.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
adapters/**/*
📄 CodeRabbit inference engine (.agents/skills/contribute-adapter/SKILL.md)
Place repository adapters under
adapters/<name>, define their install extra and packaged descriptor, select the matchingharness.resolutionstrategy, and document repository orbase_dirdescriptor discovery.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
adapters/**/*.{py,js,ts,java,go,rs}
📄 CodeRabbit inference engine (.agents/skills/contribute-adapter/SKILL.md)
adapters/**/*.{py,js,ts,java,go,rs}: Use the existing Fabricpythonorprocessrunner and normalized request/result contracts. Reuseadapters/common/only when its contract fits; do not add a runner or abstraction for one adapter.
For adapters consuming normalized configuration or runtime context, use the complete Fabric invocation and treatconfig,capability_plan,telemetry_plan, andruntime_contextas authoritative. Reserveharness.settingsfor harness-specific behavior.
Apply configuration precedence in this order: normalized config; Fabric-resolved plans and runtime context; harness-specific settings; descriptor and adapter defaults. Reject conflicting duplicate declarations or unsupported behavior with actionable field-specific errors; never silently drop configuration.
Run dependency and authentication preflight before invoking the harness. Declare fixed dependencies in descriptor requirements, validate versions, hooks, and credentials, and never expose credential values in output, errors, events, logs, or fixtures.
Forward only required system variables, selected credential variables, telemetry variables, and documented harness-specific environment; never forward or log unrelated environment values.
Run one local adapter host per Fabric runtime for orderedstart→invoke*→stop. Emit one JSON lifecycle response per request on stdout and diagnostics on stderr; treat early exit as a host crash.
Return harness-level invoke failures in a successful lifecycle response withresponse: null,failed: true, and structurederrorcontainingcode,message,retryable, and optionalmetadata.
Do not emit NeMo Relay stream records on adapter stdout. Relay records are sent out of band through the SDK-owned NDJSON ATOF endpoint; the adapter must return exactly one terminal lifecycle response.
Scope workspace, generated configuration, state, sessions, and artifacts to the resolved runtime context. Write artifacts only within the resolved r...
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
{adapters/**,examples/**}
⚙️ CodeRabbit configuration file
{adapters/**,examples/**}: Review adapter and example changes for command correctness, config/schema consistency, artifact handling, and compatibility with the public NeMo Fabric contracts.
Files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
🧠 Learnings (1)
📚 Learning: 2026-07-09T22:28:51.689Z
Learnt from: AjayThorve
Repo: NVIDIA/NeMo-Fabric PR: 43
File: adapters/claude-sdk/src/nemo_fabric_adapters/claude_sdk/adapter.py:164-168
Timestamp: 2026-07-09T22:28:51.689Z
Learning: In the NeMo-Fabric adapters, treat path values used in Fabric adapter configuration (including logic like `_resolve_path` in adapter.py) as config-root-relative. Do not apply `Path.expanduser()` (or otherwise apply `~`/home or shell-style expansion), because it will make the resolved paths normalize inconsistently across adapters. Also, do not rely on or add any resolution behavior that uses `harness.settings.cwd` as an override point for these adapter paths—`harness.settings.cwd` is explicitly unsupported in this adapter context.
Applied to files:
adapters/hermes/src/nemo_fabric_adapters/hermes/adapter.py
…mprovements Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
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Caution
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⚠️ Outside diff range comments (2)
external/nat/src/nemo_fabric_adapters/nat/adapter.py (2)
5-10: 📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick winDefine
NATon first use.Write
NeMo Agent Toolkit (NAT)in the module docstring. The following text usesNATwithout defining the abbreviation.As per coding guidelines, “Spell out terms on first use and put the acronym in parentheses.”
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@external/nat/src/nemo_fabric_adapters/nat/adapter.py` around lines 5 - 10, Update the module docstring for the NeMo Agent Toolkit adapter to spell out “NeMo Agent Toolkit” on its first occurrence and introduce the abbreviation as “NeMo Agent Toolkit (NAT)” before using “NAT” later in the text.Source: Coding guidelines
323-333: 🎯 Functional Correctness | 🟠 Major | ⚡ Quick winUpdate all stdio adapter tests to use structured
urlandargs.
tests/adapters/test_external_nat_adapter.py:408-418: Assert thatcalculator.urlissys.executableand an argument containscalculator_mcp.py.tests/adapters/test_external_nat_adapter.py:998-1025: Seturlto$NAT_TEST_MCP_COMMANDand move the command arguments intoargs. Update the expected mapping.tests/adapters/test_external_nat_adapter.py:1028-1037: Remove or replace the unbalanced-quote case because structuredargsno longer parses shell quoting.Run the focused test through
python-tests, then runjust test-python.🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@external/nat/src/nemo_fabric_adapters/nat/adapter.py` around lines 323 - 333, Update the stdio adapter tests in tests/adapters/test_external_nat_adapter.py:408-418 to assert structured url and args values, use sys.executable and verify an argument contains calculator_mcp.py; in tests/adapters/test_external_nat_adapter.py:998-1025 set url to $NAT_TEST_MCP_COMMAND, move command arguments into args, and update the expected mapping; remove or replace the unbalanced-quote case at tests/adapters/test_external_nat_adapter.py:1028-1037. The stdio handling in external/nat/src/nemo_fabric_adapters/nat/adapter.py:323-333 and the calculator example in external/nat/examples/calculator.py:61-69 require no direct changes. Run the focused test through python-tests, then run just test-python.Source: Coding guidelines
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Outside diff comments:
In `@external/nat/src/nemo_fabric_adapters/nat/adapter.py`:
- Around line 5-10: Update the module docstring for the NeMo Agent Toolkit
adapter to spell out “NeMo Agent Toolkit” on its first occurrence and introduce
the abbreviation as “NeMo Agent Toolkit (NAT)” before using “NAT” later in the
text.
- Around line 323-333: Update the stdio adapter tests in
tests/adapters/test_external_nat_adapter.py:408-418 to assert structured url and
args values, use sys.executable and verify an argument contains
calculator_mcp.py; in tests/adapters/test_external_nat_adapter.py:998-1025 set
url to $NAT_TEST_MCP_COMMAND, move command arguments into args, and update the
expected mapping; remove or replace the unbalanced-quote case at
tests/adapters/test_external_nat_adapter.py:1028-1037. The stdio handling in
external/nat/src/nemo_fabric_adapters/nat/adapter.py:323-333 and the calculator
example in external/nat/examples/calculator.py:61-69 require no direct changes.
Run the focused test through python-tests, then run just test-python.
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📓 Path-based instructions (9)
**/*.{rs,py,pyi,json,yaml,yml}
📄 CodeRabbit inference engine (.agents/skills/contribute-api/SKILL.md)
Determine and update every affected public surface, including the CLI, PyO3 bindings, Python SDK, type stubs, schemas, and adapter contract, so they remain in parity.
Files:
external/nat/examples/calculator.pyexternal/nat/src/nemo_fabric_adapters/nat/adapter.py
**/*
📄 CodeRabbit inference engine (.agents/skills/karpathy-guidelines/SKILL.md)
**/*: Before implementing, explicitly state assumptions, surface ambiguity and tradeoffs, present multiple interpretations when relevant, and ask for clarification rather than silently deciding or proceeding when requirements are unclear.
Prefer the minimum code needed to solve the requested problem: avoid speculative features, unnecessary abstractions, unrequested flexibility, and handling of impossible scenarios; simplify overcomplicated solutions.
When editing existing code, make surgical changes only: do not modify unrelated code, comments, formatting, or pre-existing dead code; match the existing style, and remove only unused imports, variables, or functions introduced by your changes.
Define verifiable success criteria for each task, such as writing regression tests for bugs and invalid-input tests for validation, then verify the implementation against those criteria. For multi-step work, state a brief plan with a verification check for each step.
**/*: Always spellNVIDIAin all caps; do not useNvidia,nvidia,nVidia,nVIDIA, orNV.
Usean NVIDIAbefore a noun, because the name begins with an “en” sound.
Do not add a registered trademark symbol afterNVIDIAwhen referring to the company; use trademark symbols with product names only when required by the document type or legal guidance.
Verify official capitalization, spacing, hyphenation, and spelling for NVIDIA and third-party product names; do not rewrite official product names for grammar or title-case rules.
Precede NVIDIA product names withNVIDIAon first mention when natural and accurate, and link the first mention when the destination helps the reader.
On first use, include the company name and full model qualifier when it helps identify the model; preserve official capitalization and punctuation, and use shorter family names only after establishing the full name.
For learning-oriented and developer content, do not force trademark symbols unless explicitly required; for press, ...
Files:
external/nat/examples/calculator.pyexternal/nat/src/nemo_fabric_adapters/nat/adapter.py
**/*.{rs,py}
📄 CodeRabbit inference engine (.agents/skills/prepare-pr/SKILL.md)
For native binding changes, run
cargo check -p fabric-python --locked.Use
snake_casefor functions and variables; usePascalCasefor Rust types and Python classes.
Files:
external/nat/examples/calculator.pyexternal/nat/src/nemo_fabric_adapters/nat/adapter.py
**/*.{py,pyi}
📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)
If Python code or a Python-facing adapter changes, run
just test-python.In Python SDK, adapters, examples, and tests, follow the existing style, use type annotations for public APIs, and keep native binding declarations synchronized with their Rust implementations.
Files:
external/nat/examples/calculator.pyexternal/nat/src/nemo_fabric_adapters/nat/adapter.py
**/*.{rs,py,pyi}
📄 CodeRabbit inference engine (.agents/skills/validate-change/SKILL.md)
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🪛 ast-grep (0.45.0)
external/nat/examples/calculator.py
[info] 86-86: use jsonify instead of json.dumps for JSON output
Context: json.dumps(output.to_mapping(), indent=2)
Note: [CWE-116] Improper Encoding or Escaping of Output.
(use-jsonify)
🪛 Ruff (0.16.1)
external/nat/src/nemo_fabric_adapters/nat/adapter.py
[warning] 58-58: Dynamically typed expressions (typing.Any) are disallowed in **metadata
(ANN401)
[warning] 72-72: Dynamically typed expressions (typing.Any) are disallowed in value
(ANN401)
[warning] 175-175: Too many branches (13 > 12)
(PLR0912)
[warning] 287-287: Dynamically typed expressions (typing.Any) are disallowed in value
(ANN401)
[warning] 304-304: Dynamically typed expressions (typing.Any) are disallowed in server
(ANN401)
[warning] 536-536: Too many branches (14 > 12)
(PLR0912)
[warning] 690-690: Dynamically typed expressions (typing.Any) are disallowed in build_nat_config
(ANN401)
[warning] 718-718: Prefer TypeError exception for invalid type
(TRY004)
[warning] 718-718: Avoid specifying long messages outside the exception class
(TRY003)
[warning] 730-732: Avoid specifying long messages outside the exception class
(TRY003)
[warning] 737-737: Dynamically typed expressions (typing.Any) are disallowed in response
(ANN401)
[warning] 770-770: Do not catch blind exception: Exception
(BLE001)
[warning] 771-774: Use logging.exception instead of logging.error
Replace with exception
(TRY400)
[warning] 850-854: Use a single with statement with multiple contexts instead of nested with statements
(SIM117)
[warning] 858-858: Do not catch blind exception: Exception
(BLE001)
[warning] 859-862: Use logging.exception instead of logging.error
Replace with exception
(TRY400)
[warning] 873-876: Use logging.exception instead of logging.error
Replace with exception
(TRY400)
Signed-off-by: David Gardner <dagardner@nvidia.com>
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@tests/adapters/test_external_nat_adapter.py`:
- Around line 1010-1018: Extend the test configuration around
nat_mcp_server_config to include the literal $NAT_TEST_MCP_COMMAND in one args
entry and one env value, then assert both values remain unexpanded while the url
continues expanding. Preserve the existing command, port, trace, and timeout
coverage.
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🔇 Additional comments (3)
external/nat/README.md (1)
53-56: LGTM!tests/adapters/test_external_nat_adapter.py (2)
417-420: LGTM!
1038-1048: LGTM!
Salonijain27
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Salonijain27
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Approved from a dependency point of view
…mprovements Signed-off-by: David Gardner <dagardner@nvidia.com>
AjayThorve
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just a few comments, should be good to merge post that
…pping such that the values in the file redirect to other environment variables, this prevents the issue where if the process was terminated credentials wouldn't remain on disk Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
Signed-off-by: David Gardner <dagardner@nvidia.com>
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5 participants
Overview
argsandenvfor MCP arguments to Deepagents, Claude and Codex.shlex.split(url)to split the command from the argument.Hermes Agent specific changes:
_clear_tool_defs_cachedoesn't appear to be neededdiscover_mcp_toolsandshutdown_mcp_serverswithasyncio.to_threadWhere should the reviewer start?
Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)
Closes FABRIC-172
Closes FABRIC-168
Closes FABRIC-169
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
Summary by CodeRabbit
New Features
Bug Fixes
Chores