doc: design spec for azd ai agent toolbox direct commands

[hund030]

Summary

This PR adds the design spec for the azd ai agent toolbox direct commands. This is for design review only and contains no implementation code.

What's in this spec

• Five top-level verbs for managing versioned toolboxes against a Foundry project:

  • toolbox create <name>: register a toolbox (pending tools until first connection add).
  • toolbox update <name> --default-version <n>: retarget the active version.
  • toolbox delete <name>: delete the whole toolbox or a single version via --version.
  • toolbox show <name>: display metadata, version body, and the toolbox's MCP endpoint URL for runtime consumption.
  • toolbox list: list toolboxes plus any local pending records for the resolved endpoint.

• Connection subgroup (connection add | remove | list) that wraps the toolbox versions API. Every tool mutation is a full-tools[] POST to /toolboxes/{name}/versions followed by a PATCH default_version; tool-entry shape is inferred from the project connection's ARM category (RemoteTool → mcp, CognitiveSearch → azure_ai_search).

• Tag subgroup (tag set | remove | list) shipped as a Compatibility stub: toolboxes are not yet exposed as ARM resources, so the standard ARM resource-tag surface is unavailable. The CLI surface is final and activates without surface changes once the underlying API exists.

• Pending-toolbox config store: create cannot POST because the service requires a non-empty tools[], so it records a local entry under extensions.ai-agents.pending-toolboxes.<endpointHash>.items.<name>. The first connection add promotes the record to a real v1.

• Live-verified API surface (§ 4): every endpoint the spec relies on was probed against a live Foundry project, including the per-version delete guard, the MCP runtime endpoint, and the ARM connection lookup used by connection add.

Key design decisions for review

1. Extension placement (§ 3): toolbox commands live inside the existing azure.ai.agents extension at azd ai agent toolbox …. Files are isolated under internal/cmd/toolbox*.go and internal/pkg/toolbox/ so a future move to a standalone azure.ai.toolbox extension is a registration-only change.
2. create does not POST (§ 5.1, Open Question 1): the service requires a non-empty tools[]. Two options were considered — auto-seed with a sentinel built-in, or defer the first POST until the first connection add. Current proposal: defer (pending-record model). Keeps create non-network and matches the "one command, one action" principle.
3. update is --default-version only (§ 5.2): the service only accepts default_version on PATCH. Description and tool edits must go through connection add / connection remove, which publish a new version.
4. Per-version delete is exposed (§ 5.3): the service refuses to delete the default_version when sibling versions exist (400). When the default is the only remaining version the service deletes it and cascades to remove the parent toolbox; the CLI rejects this without --force to avoid surprise destruction.
5. Tools support both built-ins and connection-backed entries (§ 4.2, § 2 Non-Goals): the service accepts code_interpreter, web_search, file_search, mcp, and azure_ai_search side-by-side. Per issue Add azd ai toolbox create/update/show/list/delete (plus connection and tag subcommands) to manage Foundry Toolboxes from any directory #8143, built-ins are wired on the agent rather than via toolboxes; the CLI does not author built-ins but carries them through unchanged during fetch-merge-POST.
6. No -p short form (§ 5.1): -p is already taken on agent run / agent invoke. The canonical name is --project-endpoint, matching the project-context spec.

Related

• Feature request: #8143 Feature: Add ai.toolbox commands for CRUD on Toolboxes in Foundry Project
• Sibling design specs:
  • #8138 docs: design spec for azd ai connection direct commands
  • #8152 doc: design spec for azd ai project context commands and endpoint resolution — the 5-level endpoint resolution cascade referenced in § 6 is owned by this spec.
• Feature spec: azd ai Direct Commands (CLI Surface for Foundry)

[github-actions]

📋 Prioritization Note

Thanks for the contribution! The linked issue isn't in the current milestone yet.
Review may take a bit longer — reach out to @rajeshkamal5050 or @kristenwomack if you'd like to discuss prioritization.

[Copilot]

Pull request overview

Adds a new design specification document describing the proposed azd ai agent toolbox direct-command surface in the azure.ai.agents extension (design review only; no implementation).

Changes:

• Documents the planned toolbox CRUD command surface (create|update|delete|show|list) plus connection and tag subgroups.
• Specifies data-plane API endpoints, request/response shapes, and CLI behaviors (including a local pending-toolbox record model).
• Outlines endpoint resolution, config storage shape, telemetry events, error codes, and a test plan.

Comments suppressed due to low confidence (1)

cli/azd/docs/design/azure-ai-toolbox-direct-commands.md:166

• The spec’s computed MCP consumption URL omits the toolbox version ({projectEndpoint}/toolboxes/{name}/mcp?...). In the existing extension code, the MCP endpoint is version-scoped: /toolboxes/{name}/versions/{version}/mcp?api-version=v1 (see extensions/azure.ai.agents/internal/cmd/listen.go). If the service contract is versioned, this spec should reflect that so show returns a runnable URL.

1. `GET /toolboxes/{name}` for `default_version`.
2. `GET /toolboxes/{name}/versions/{version}` (or `default_version` when `--version` is absent) for the body.
3. Compute the toolbox's MCP consumption URL as `{projectEndpoint}/toolboxes/{name}/mcp?api-version=v1`.
4. Output:

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 5 comments.

[jongio]

Solid spec with clear API mapping, good test plan, and well-structured command surface. A few design gaps that'll bite during implementation:

Error code overloading: CodeInvalidToolbox is used for 6+ distinct failure modes (duplicate connection, unsupported category, empty tools, missing --index, missing connection, invalid version target). This makes telemetry useless for distinguishing root causes. Consider at least: CodeDuplicateConnection, CodeUnsupportedConnectionCategory, CodeEmptyToolsArray, CodeMissingIndex.

TOCTOU in shared write flow: Steps 2-5 (fetch default version, mutate, POST, PATCH) have a race window. Two concurrent connection add calls both fetch the same version, both POST, and the second creates a version missing the first's tool. Worth acknowledging as a known limitation or describing retry/conflict detection (e.g., conditional on the fetched version number).

Stale pending-record accumulation: Records are cleared by connection add or delete, but if a user runs create and never follows up (or the endpoint changes), pending records accumulate forever. Consider a TTL (e.g., 30 days) or a toolbox list --cleanup-stale hint.

Built-in tool interaction with last-tool guard: connection remove rejects when tools[] would be empty. But if removing the last connection-backed tool leaves only built-ins (which are "carried through unchanged"), is the result considered empty? The guard should clarify whether empty means zero total entries or zero connection-backed entries.

show on pending toolbox: create records locally, but show does GET /toolboxes/{name} which will 404 for a pending-only toolbox. Should show fall back to displaying the pending record metadata, or explicitly error with "toolbox is pending, run connection add first"?

[hund030]

@jongio Thanks for the review - all five are valid and the spec is updated.

• Error codes — CodeInvalidToolbox replaced with 10 specific codes (§ 11).
• TOCTOU — documented as known v1 limitation; no client-side mitigation since service lacks If-Match/CAS and any client-side detect has its own TOCTOU (§ 5.6 Concurrency). Workaround: serialize calls.
• Stale pending records — list shows CREATED; delete clears pending-only records (§§ 5.3, 5.5, 7).
• Empty tools[] — CodeLastToolRemoval defined as "zero entries including built-ins" (§ 5.6, § 11).
• show on pending — pre-checks the pending store on 404 and emits a pending view (§ 5.4.1); --version rejected.

[jongio]

Addresses all feedback from my prior review:

• Error codes split from the overloaded CodeInvalidToolbox into distinct codes (CodeDuplicateConnection, CodeDefaultVersionDelete, CodeOnlyVersionDelete, etc.) - telemetry can now distinguish root causes.
• TOCTOU race documented as a known limitation with clear user guidance (serialize calls, wait for service conditional-write support).
• Pending-record cleanup is user-driven via delete; list now surfaces CREATED so stale entries are visible.
• Built-in tool guard clarified: "zero entries (counting any built-ins carried through)."
• show on pending-only toolbox specified in new section 5.4.1 with both table and JSON output contracts.

Architecture simplification (extending FoundryToolboxClient directly rather than wrapping via composition) is a good call - less indirection, same one-way import graph.