Gap Analysis — TanStack AI adapter audit

You are auditing TanStack AI's provider adapters against each provider's upstream documentation. This is a maintainer tool. Your only output is a markdown report under .agent/gap-analysis/. Do not edit source files.

Invocation

Workflow

1. Parse scope. If missing, AskUserQuestion with the four options above.
2. Load the truth files, then read the per-scope inputs you need:
   • Matrix: testing/e2e/src/lib/feature-support.ts
   • Types: testing/e2e/src/lib/types.ts (Provider + Feature unions, ALL_PROVIDERS, ALL_FEATURES)
   • Adapter index: packages/ai-<provider>/src/index.ts
   • Model meta: packages/ai-<provider>/src/model-meta.ts
   • Core types: packages/ai/src/types.ts (Modality, ContentPart, ToolCall)
3. Research upstream. Use WebFetch against the curated URLs in references/provider-doc-urls.md. When a doc page has moved, fall back to WebSearch. For SDK API surface details use the context7 MCP server (mcp__plugin_context7_context7__resolve-library-id then mcp__plugin_context7_context7__query-docs).
4. Walk the audit dimensions in references/audit-checklist.md:
   1. New models
   2. Cross-adapter feature parity
   3. Untracked features
   4. Capability-flag drift
   5. Telemetry / observability parity (usage tokens, cache/reasoning counts, request ids, logging asymmetry)
   6. Activity coverage (which of the 7 core activity kinds each provider ships an adapter for vs. what upstream supports) — this is the only dimension for the activities scope; it's also rolled into --all.
5. Fan out for --all: launch one Explore subagent per provider, max 3 in parallel. Each subagent returns the multi-dimension findings for its provider; you synthesise into the combined report. The activities scope does not fan out — derive the provider×activity matrix centrally from the adapter files (see dimension 6), since it's a fast mechanical diff.
6. Write the report to .agent/gap-analysis/YYYY-MM-DD-<scope>.md using references/report-template.md. Date is today's ISO date. <scope> is openai / feature-tts / models / activities / all.
7. Print the report path and a 5-line summary to the user.

Critical rules

1. Never edit feature-support.ts or any model-meta.ts. The report is read-only — the maintainer applies changes.
2. Always reference line numbers when citing exclusions (e.g., feature-support.ts:57) so the maintainer can jump to them.
3. Distinguish three gap classes in the report:
   • Real gap — upstream supports it, TanStack AI doesn't, no exclusion comment.
   • Tested gap — TanStack AI doesn't list it but there's an exclusion comment in feature-support.ts (e.g., aimock format limitation). Not actionable code-wise; surface in "Out-of-scope" section.
   • Stale capability flag — model-meta.ts declares a capability the model no longer has, or omits one it now has.
4. Cite sources. Every claim "upstream supports X" must link the upstream doc page you read. No claims from training data.
5. Use today's date from the system context (currentDate). Never invent.
6. Quote the relevant snippet from feature-support.ts when flagging a parity gap, so the report is self-contained.

Known providers

openai, anthropic, gemini, ollama, grok, groq, openrouter, bedrock (@tanstack/ai-bedrock; three-API surface — Converse default (adapter name bedrock-converse), Chat Completions opt-in (api: 'chat', adapter name bedrock), Responses opt-in (api: 'responses', adapter name bedrock-responses)), fal (media-only), elevenlabs (TTS-only). The feature matrix tracks openai, anthropic, gemini, ollama, grok, groq, openrouter, bedrock, bedrock-converse, and bedrock-responses; fal and elevenlabs only appear in model/media audits.

Known features (19)

Canonical list is ALL_FEATURES in testing/e2e/src/lib/types.ts — always re-read it; this list is a snapshot:

chat, one-shot-text, reasoning, multi-turn, tool-calling, parallel-tool-calls, tool-approval, text-tool-text, structured-output, structured-output-stream, agentic-structured, multimodal-image, multimodal-structured, summarize, summarize-stream, image-gen, tts, transcription, video-gen.

Known activities (7)

Features (above) are matrix rows about behaviours within an activity. Activities are the coarser-grained core capability kinds in @tanstack/ai — each has a Base<Kind>Adapter and a provider "supports" one only if its package ships an adapter of that kind. Canonical list is the AdapterKind union in packages/ai/src/activities/index.ts — always re-read it:

text, summarize, image, audio, video, tts, transcription.

A provider's activity surface is derived mechanically from its adapter files: packages/ai-<provider>/src/adapters/. Filename → activity-kind map:

(cost.ts is a helper, not an activity adapter.)

Verification before finishing

Before printing the summary:

• Report file exists and is non-empty.
• git status shows only new files under .agent/gap-analysis/ — nothing under packages/ or testing/ should have been modified. Run git status and confirm.
• Every "real gap" entry has an upstream doc URL.