feat(server): add Prime Agent as an ACP provider - #13670
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🟠 High Drivers/PrimeAgentDriver.ts:97
A non-zero exit from prime-agent --version is treated as a successful health probe, so makePrimeAgentProvider marks a broken or misconfigured executable as installed with version unknown until session startup fails. Check result.code and fail the probe when it is non-zero before constructing the initialize response.
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In file @apps/server/src/provider/Drivers/PrimeAgentDriver.ts around line 97:
A non-zero exit from `prime-agent --version` is treated as a successful health probe, so `makePrimeAgentProvider` marks a broken or misconfigured executable as installed with version `unknown` until session startup fails. Check `result.code` and fail the probe when it is non-zero before constructing the initialize response.
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Fixed in ecedee6. The probe now fails with a ProviderSetupError when --version exits non-zero instead of reporting the executable as installed.
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| const mimeType = attachment.mimeType.toLowerCase().split(";", 1)[0] ?? ""; | ||
| const image = attachment.type === "image" && IMAGE_MIME_TYPES.has(mimeType); | ||
| const pdf = attachment.type === "file" && mimeType === "application/pdf"; | ||
| const textFile = |
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🟠 High acp/PrimeAgentAcpSupport.ts:151
Text files whose MIME type is application/octet-stream are rejected by buildPrimeAgentPrompt, so files such as example.tsx never reach Prime Agent even though the error claims text files are supported. The textFile check only examines MIME type; accept known text filename extensions (as elsewhere in ACP attachment handling) or infer the MIME type before this check.
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In file @apps/server/src/provider/acp/PrimeAgentAcpSupport.ts around line 151:
Text files whose MIME type is `application/octet-stream` are rejected by `buildPrimeAgentPrompt`, so files such as `example.tsx` never reach Prime Agent even though the error claims text files are supported. The `textFile` check only examines MIME type; accept known text filename extensions (as elsewhere in ACP attachment handling) or infer the MIME type before this check.
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Fixed in ecedee6. Text detection now also accepts known text file extensions, so .tsx and similar files pass with an octet-stream MIME type.
ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR introduces a large new ACP provider and production process/session integration across server, shared runtime, settings, and client surfaces, along with product-default changes. Unresolved high-severity findings also affect executable health detection and supported text attachments. Not approved because:
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: pingdotgg/t3code/.coderabbit.yaml Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (5)
🚧 Files skipped from review as they are similar to previous changes (4)
Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThis change adds Prime Agent as a configurable provider. It defines provider settings and model metadata, starts ACP sessions, handles prompts and provider events, tracks provider status and workspace snapshots, and registers Prime Agent in server and client interfaces. ChangesPrime Agent provider
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant ProviderClient
participant PrimeAgentAdapter
participant AcpSessionRuntime
participant PrimeAgentProcess
ProviderClient->>PrimeAgentAdapter: Start session
PrimeAgentAdapter->>AcpSessionRuntime: Start ACP runtime
AcpSessionRuntime->>PrimeAgentProcess: Spawn with ACP mode
PrimeAgentProcess-->>AcpSessionRuntime: Return session setup and runtime events
AcpSessionRuntime-->>PrimeAgentAdapter: Provide session and events
PrimeAgentAdapter-->>ProviderClient: Publish session state and provider events
Merge Risk: ⚪ Minimal · up to Prime Agent can use its advertised no-auth-method ACP flow, while other production ACP callers retain their authentication methods. No actionable merge risk is evident. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The new provider is opt-in and routes tool requests through approval, but its requested operating mode is not applied to the agent. It also starts a process with environment-backed credentials; authorization before that process starts remains unverified. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 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: 4
- 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@apps/server/src/provider/acp/PrimeAgentAcpSupport.ts`:
- Around line 82-127: Align primeAgentModelOptions, resolvePrimeAgentModel, and
applyPrimeAgentAcpModelSelection with buildPrimeAgentModelsFromSession by using
the same lookup for model options, including categorized options with other IDs
and the models-block fallback. Preserve the negotiated config-option ID and use
setModel for config options; when models are exposed only through the models
block, resolve the current and available model state and use setSessionModel.
In `@apps/server/src/provider/Drivers/PrimeAgentDriver.ts`:
- Around line 87-95: Update the `spawnAndCollect` error mapping in
`PrimeAgentDriver` to use the not-installed detail only when
`isCommandMissingCause(cause)` or the cause’s error code identifies `ENOENT`.
For all other causes, use a generic start-failure detail that does not match
`isMissingInstallation`’s not-installed or missing checks.
- Around line 80-86: Update the version probe in the `PrimeAgentDriver` probe
flow to use `resolveSpawnCommand` before spawning. Pass its resolved command,
arguments, and shell value to `ChildProcess.make`, preserving the `--version`
probe behavior.
In `@packages/contracts/src/settings.ts`:
- Line 1289: Update fallbackTextGenerationProvider in serverSettings.ts to skip
providers that do not support text generation, including primeAgent, before
checking whether each provider is enabled. Keep the existing enabled-state
resolution for supported providers so fallback selects the first enabled
text-generation provider.
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📒 Files selected for processing (18)
apps/mobile/src/components/ProviderIcon.tsxapps/server/src/provider/Drivers/PrimeAgentDriver.tsapps/server/src/provider/Layers/PrimeAgentAdapter.tsapps/server/src/provider/Layers/PrimeAgentProvider.test.tsapps/server/src/provider/Layers/PrimeAgentProvider.tsapps/server/src/provider/acp/AcpSessionRuntime.tsapps/server/src/provider/acp/PrimeAgentAcpSupport.test.tsapps/server/src/provider/acp/PrimeAgentAcpSupport.tsapps/server/src/provider/builtInDrivers.tsapps/server/src/provider/model-manifest.jsonapps/server/src/provider/providerStatusCache.tsapps/server/src/serverSettings.tsapps/server/src/textGeneration/PrimeAgentTextGeneration.tsapps/web/src/components/Icons.tsxapps/web/src/components/chat/providerIconUtils.tsapps/web/src/components/settings/providerDriverMeta.tspackages/contracts/src/model.tspackages/contracts/src/settings.ts
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…-generation fallback
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Prime Agent is not selectable in T3 Code. This adds it as an ACP provider.
Prime Agent already speaks ACP (
prime-agent --mode acp), so this reuses the existingeffect-acpstack instead of a new protocol adapter:primeAgentdriver, provider snapshot, and ACP adapter. Each thread gets its own process because Prime Agent fixes its cwd at startup and hosts one session per connection.prime-agent --version, so a status poll never starts Prime Agent's daemon or Python kernel.AcpSessionRuntimenow skipsauthenticatewhen a driver sets noauthMethodId. Prime Agent advertises no auth methods and reads credentials from the environment or its own login, so an unconditionalauthenticatecall would fail against it.Not included yet:
supportsTextGeneration: false); Prime Agent has no lightweight completion path, only the full ACP session or RPC mode.loadSession: false._metaextensions (subagents, goals, heartbeats, refinement) are ignored.This is a large feature PR that adds a driver.
CONTRIBUTING.mdsays feature work is unlikely to be accepted without a prior discussion, so treat it as a starting point rather than a finished contribution.Implemented by openrouter/deepseek/deepseek-v4.1-flash in T3 Code.
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