SANDBOX-1981: MCP hot-path contract - #39
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- Export BuildBasePodSpec with instance labels, automount false, and class overlay - Require instance name, kubeconfig secret, sandbox SA, and namespace flags - Always claim unassigned pods then create; drop MCP pool replenish and idle GC - Health-check by listing namespaced pods; note claim-fail rediscover for Phase 5 Signed-off-by: Feny Mehta <fbm3307@gmail.com> Co-authored-by: Cursor <cursoragent@cursor.com>
WalkthroughThe server now requires expanded sandbox configuration. Session pods use instance-aware labels, secured pod specifications, and protected environment variables. Session creation claims matching unassigned pods before on-demand creation. Warm-pool reconciliation and server-managed stale cleanup were removed. ChangesSandbox configuration and CLI wiring
Sandbox pod specification
Instance-scoped claim-or-create flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR changes sandbox pod construction and session creation, but it currently risks pod admission failures in restricted namespaces and process panics when resource configuration is invalid. These issues should be fixed before merge. Sequence Diagram(s)sequenceDiagram
participant SessionManager
participant WarmPool
participant KubernetesAPI
SessionManager->>WarmPool: claim an instance-scoped unassigned pod
WarmPool->>KubernetesAPI: update pod labels and create auth Secret
WarmPool-->>SessionManager: return claimed pod or failure
SessionManager->>KubernetesAPI: rediscover assigned pod
SessionManager->>KubernetesAPI: create a pod if no claim succeeds
Suggested labels: Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@pkg/session/podspec.go`:
- Around line 43-45: Update the PodSecurityContext in the base pod spec to set
SeccompProfile.Type to corev1.SeccompProfileTypeRuntimeDefault, while preserving
RunAsNonRoot. Extend TestBuildBasePodSpecOverlay to assert the RuntimeDefault
seccomp profile.
- Around line 53-58: Update BuildBasePodSpec to parse the effective CPU and
memory requests and limits with resource.ParseQuantity instead of
resource.MustParse, returning any parsing error as a configuration validation
error. Preserve the existing config-over-default selection for all four
SandboxConfig quantity fields and propagate the error to NewSessionManager
without panicking.
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Fix all unresolved CodeRabbit comments on this PR:
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ℹ️ Review info
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Configuration used: Repository YAML (base), Organization UI (inherited)
Review profile: CHILL
Plan: Enterprise
Run ID: bbd34fc3-b6f1-4b44-ae56-c83f03e5e369
📒 Files selected for processing (13)
README.mdcmd/server/flags.gocmd/server/flags_test.gocmd/server/health_test.gocmd/server/main.godocs/proposals/cli-mcp-operator-design.mdpkg/session/config.gopkg/session/manager.gopkg/session/manager_test.gopkg/session/podspec.gopkg/session/podspec_test.gopkg/session/pool.gopkg/session/pool_test.go
🔗 Linked repositories identified
CodeRabbit considers these linked repositories for cross-repo context during reviews:
codeready-toolchain/mcp-common(manual)codeready-toolchain/mcp-server-devsandbox(manual)codeready-toolchain/api(manual)codeready-toolchain/toolchain-common(manual)codeready-toolchain/host-operator(manual)codeready-toolchain/toolchain-e2e(manual)
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📜 Review details
⏰ Context from checks skipped due to timeout. (3)
- GitHub Check: Build Image (cli-mcp-server)
- GitHub Check: Build Image (cli-mcp-operator)
- GitHub Check: build-test-coverage
🧰 Additional context used
📓 Path-based instructions (1)
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⚙️ CodeRabbit configuration file
-Focus on major issues impacting performance, readability, maintainability and security. Avoid nitpicks and avoid verbosity.
Files:
cmd/server/health_test.gocmd/server/flags_test.godocs/proposals/cli-mcp-operator-design.mdcmd/server/flags.gopkg/session/podspec_test.gopkg/session/podspec.goREADME.mdpkg/session/manager_test.gocmd/server/main.gopkg/session/config.gopkg/session/manager.gopkg/session/pool.gopkg/session/pool_test.go
🪛 ast-grep (0.45.1)
pkg/session/manager_test.go
[warning] 34-34: A credential is hard-coded as a string literal. Secrets stored in source code, such as passwords, API keys, and tokens, can be leaked through version control or binaries and used by internal or external malicious actors. Rotate the exposed secret and load it at runtime from a secure secret vault, a Hardware Security Module (HSM), or an environment variable if permitted by your company policy (e.g. password := os.Getenv("APP_PASSWORD")).
Context: testKubeSecret = "cli-mcp-oc-kubeconfig"
Note: [CWE-798] Use of Hard-coded Credentials.
(hardcoded-credentials-string-literal-go)
🪛 LanguageTool
docs/proposals/cli-mcp-operator-design.md
[grammar] ~498-~498: Ensure spelling is correct
Context: ...the cheap place. Include the claim-fail rediscover (sibling already assigned a pool pod; losing rep...
(QB_NEW_EN_ORTHOGRAPHY_ERROR_IDS_1)
🔇 Additional comments (14)
pkg/session/config.go (1)
3-68: LGTM!cmd/server/flags.go (1)
13-100: LGTM!cmd/server/flags_test.go (1)
12-148: LGTM!cmd/server/main.go (1)
31-95: LGTM!Also applies to: 137-140, 238-238
cmd/server/health_test.go (1)
13-23: LGTM!README.md (1)
16-16: LGTM!Also applies to: 54-54, 65-79, 101-101, 115-122, 151-151
pkg/session/manager.go (3)
49-88: LGTM!
156-160: The claim-fail rediscovery step is not implemented, but the stack summary states it is.The layer description for "Instance-scoped claim-or-create flow" states that session creation "rediscovers after claim failures". The code comment on Line 158 documents this as a Phase 5 follow-up, and
docs/proposals/cli-mcp-operator-design.mdLine 497 also defers it. The code only rediscovers whencreateSandboxPodreturnsAlreadyExists.The behavior matches the design document, so the code is not wrong. Confirm that the PR description and stack summary are corrected to say the rediscovery is deferred.
137-155: LGTM!Also applies to: 184-185, 238-242, 259-267, 325-325, 424-424, 438-439
pkg/session/manager_test.go (1)
30-46: LGTM!Also applies to: 74-81, 198-236, 323-343, 435-441, 482-487, 496-503, 581-581, 595-595, 739-739
docs/proposals/cli-mcp-operator-design.md (1)
497-498: LGTM!pkg/session/pool.go (1)
19-31: LGTM!Also applies to: 43-43, 58-58, 76-76, 89-89, 108-116, 125-125, 206-206
pkg/session/pool_test.go (2)
38-43: LGTM!Also applies to: 105-114, 157-164, 184-189, 202-215, 245-297, 299-336
23-28: 📐 Maintainability & Code QualityNo change needed. The module declares Go 1.26.0, which supports
t.Context().> Likely an incorrect or invalid review comment.
2 participants
Phase-3
cmd/serverflag-driven claim + on-demand create only: exportBuildBasePodSpecwithcli-mcp.redhat.comlabels, dedicated sandbox SA, andautomountServiceAccountToken: false; merge class overlay (resources/env/imagePullPolicy) inpkg/sessionwith noapi/import.--instance-name,--kubeconfig-secret,--sandbox-service-account, and--namespace(notarsy/ investigation-SA defaults). Discover/claim/unassigned selectors are instance + component./healthlists pods in-namespace.StartPool/ReconcilePool/TriggerReplenish/ idle GC.--idle-timeoutand--warm-pool-sizestill parse for CLI compatibility and have no effect.Assisted By: Cursor