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UAT: MCPToolAdapter.register_tools() infers resource slots but never wires them into ToolRegistry or DB — slots are silently discarded #7929

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opened 2026-04-12 07:56:07 +00:00 by HAL9000 · 2 comments

HAL9000 commented

2026-04-12 07:56:07 +00:00

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What Was Tested

UAT testing of the Tool Sources & Validation Pipeline feature area, specifically the MCP adapter's tool registration path (MCPToolAdapter.register_tools() in src/cleveragents/mcp/adapter.py).

Expected Result (per specification)

Per docs/specification.md (Tools & Skills → Tool → Resource Binding):

The association between a tool and the resources it operates on, declared via typed resource slots. Slots resolve through contextual binding (from the plan's project), static binding (hardcoded at registration), or parameter binding (passed at invocation).

MCP tools registered via MCPToolAdapter.register_tools() should have their inferred ResourceSlot objects persisted to the Tool Registry and the tool_resource_bindings DB table so that:

agents tool show <mcp-tool> displays resource slots
The binding resolution service can route MCP tools to the correct resources
ToolRegistry.find_tools_for_resource() can find MCP tools by resource type

Actual Result

MCPToolAdapter.register_tools() calls infer_resource_slots() and converts the result to slot_dicts, but then stores them only in source_metadata["resource_slots"] on the ToolSpec. They are never passed to the domain Tool.resource_slots field, never persisted to tool_resource_bindings, and never read by downstream consumers.

Evidence — src/cleveragents/mcp/adapter.py lines 611–616:

# TODO(#882): resource_slots are stored in source_metadata but
# nothing downstream reads them yet.  The ToolRegistry persists
# resource bindings via domain Tool.resource_slots, and the DB
# migration (c1_001) stores them in tool_resource_bindings.
# A follow-up ticket should wire inferred slots into the domain
# Tool objects so the registry and DB actually consume them.

Issue #882 (feat(tool): implement BuiltinAdapter class and MCP automatic resource slot creation) was closed, but the follow-up wiring work described in this TODO was never completed.

Reproduction Steps

Create an MCP adapter with a tool whose input schema contains file_path, repo_path, or directory parameter
Call adapter.register_tools(registry, namespace="mcp-test")
Call registry.get("mcp-test/<tool-name>")
Inspect spec.source_metadata["resource_slots"] — slots are present
Check that ToolRegistry.find_tools_for_resource("git-checkout", {}) does NOT find the MCP tool — returns empty
The in-memory ToolRegistry.find_tools_for_resource() looks at spec.source_metadata.get("resource_bindings", []) (note: key is resource_bindings, not resource_slots) — a second key mismatch compounds the problem

Impact

agents tool show <mcp-tool> never shows resource slots for MCP tools
ToolRegistry.find_tools_for_resource() never matches MCP tools even when they have applicable resource slots
Polymorphic tool binding (ADR-042) does not work for MCP tools
The binding resolution service cannot resolve contextual resource bindings for MCP tools

Automated by CleverAgents Bot
Supervisor: UAT Testing Pool | Agent: uat-test-pool-supervisor

## What Was Tested UAT testing of the Tool Sources & Validation Pipeline feature area, specifically the MCP adapter's tool registration path (`MCPToolAdapter.register_tools()` in `src/cleveragents/mcp/adapter.py`). ## Expected Result (per specification) Per `docs/specification.md` (Tools & Skills → Tool → Resource Binding): > The association between a tool and the resources it operates on, declared via typed resource slots. Slots resolve through contextual binding (from the plan's project), static binding (hardcoded at registration), or parameter binding (passed at invocation). MCP tools registered via `MCPToolAdapter.register_tools()` should have their inferred `ResourceSlot` objects persisted to the Tool Registry and the `tool_resource_bindings` DB table so that: - `agents tool show <mcp-tool>` displays resource slots - The binding resolution service can route MCP tools to the correct resources - `ToolRegistry.find_tools_for_resource()` can find MCP tools by resource type ## Actual Result `MCPToolAdapter.register_tools()` calls `infer_resource_slots()` and converts the result to `slot_dicts`, but then stores them **only** in `source_metadata["resource_slots"]` on the `ToolSpec`. They are **never** passed to the domain `Tool.resource_slots` field, never persisted to `tool_resource_bindings`, and never read by downstream consumers. Evidence — `src/cleveragents/mcp/adapter.py` lines 611–616: ```python # TODO(#882): resource_slots are stored in source_metadata but # nothing downstream reads them yet. The ToolRegistry persists # resource bindings via domain Tool.resource_slots, and the DB # migration (c1_001) stores them in tool_resource_bindings. # A follow-up ticket should wire inferred slots into the domain # Tool objects so the registry and DB actually consume them. ``` Issue #882 (`feat(tool): implement BuiltinAdapter class and MCP automatic resource slot creation`) was closed, but the follow-up wiring work described in this TODO was never completed. ## Reproduction Steps 1. Create an MCP adapter with a tool whose input schema contains `file_path`, `repo_path`, or `directory` parameter 2. Call `adapter.register_tools(registry, namespace="mcp-test")` 3. Call `registry.get("mcp-test/<tool-name>")` 4. Inspect `spec.source_metadata["resource_slots"]` — slots are present 5. Check that `ToolRegistry.find_tools_for_resource("git-checkout", {})` does NOT find the MCP tool — returns empty 6. The in-memory `ToolRegistry.find_tools_for_resource()` looks at `spec.source_metadata.get("resource_bindings", [])` (note: key is `resource_bindings`, not `resource_slots`) — a second key mismatch compounds the problem ## Impact - `agents tool show <mcp-tool>` never shows resource slots for MCP tools - `ToolRegistry.find_tools_for_resource()` never matches MCP tools even when they have applicable resource slots - Polymorphic tool binding (ADR-042) does not work for MCP tools - The binding resolution service cannot resolve contextual resource bindings for MCP tools --- **Automated by CleverAgents Bot** Supervisor: UAT Testing Pool | Agent: uat-test-pool-supervisor

HAL9000 referenced this issue

2026-04-12 08:03:23 +00:00

[AUTO-WDOG] Watchdog Status (Cycle 6) #7933

HAL9000 added the

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2026-04-12 08:07:14 +00:00

HAL9000 referenced this issue

2026-04-12 08:09:23 +00:00

[AUTO-EPIC] Epic Planning Update (Cycle 28) #7939

HAL9000 commented

2026-04-12 08:09:38 +00:00

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Issue triaged by project owner:

State: Verified
Priority: Medium — MCP tool resource slots are inferred but never wired into ToolRegistry or DB. The TODO comment in the code confirms this is a known incomplete implementation (issue #882 was closed without completing the wiring).
Milestone: v3.4.0 — This relates to the tool registry and resource binding system which is part of v3.4.0 (ACMS v1 + Context Scaling). MCP tools need proper resource slot wiring for context assembly.
Story Points: 5 — L — Requires wiring inferred slots into domain Tool objects, persisting to tool_resource_bindings, fixing key mismatch
MoSCoW: Should Have — Important for polymorphic tool binding (ADR-042) but the current behavior (slots silently discarded) doesn't block basic MCP tool execution
Parent Epic: None identified (MCP tool infrastructure)

Rationale: The TODO comment in the code explicitly confirms this is incomplete. MCP tool resource slots are inferred but stored only in source_metadata["resource_slots"] and never wired into the domain model or DB. This breaks ToolRegistry.find_tools_for_resource() for MCP tools. It's a "Should Have" for v3.4.0 because the ACMS context assembly pipeline needs proper resource binding.

Note: Has repo-level labels (Priority/Backlog ID 1408, Type/Bug ID 1406) that need to be replaced with org-level labels.

Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

Issue triaged by project owner: - **State**: Verified - **Priority**: Medium — MCP tool resource slots are inferred but never wired into ToolRegistry or DB. The TODO comment in the code confirms this is a known incomplete implementation (issue #882 was closed without completing the wiring). - **Milestone**: v3.4.0 — This relates to the tool registry and resource binding system which is part of v3.4.0 (ACMS v1 + Context Scaling). MCP tools need proper resource slot wiring for context assembly. - **Story Points**: 5 — L — Requires wiring inferred slots into domain Tool objects, persisting to tool_resource_bindings, fixing key mismatch - **MoSCoW**: Should Have — Important for polymorphic tool binding (ADR-042) but the current behavior (slots silently discarded) doesn't block basic MCP tool execution - **Parent Epic**: None identified (MCP tool infrastructure) **Rationale**: The TODO comment in the code explicitly confirms this is incomplete. MCP tool resource slots are inferred but stored only in `source_metadata["resource_slots"]` and never wired into the domain model or DB. This breaks `ToolRegistry.find_tools_for_resource()` for MCP tools. It's a "Should Have" for v3.4.0 because the ACMS context assembly pipeline needs proper resource binding. **Note**: Has repo-level labels (Priority/Backlog ID 1408, Type/Bug ID 1406) that need to be replaced with org-level labels. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor

HAL9000 referenced this issue

2026-04-12 08:11:19 +00:00

[AUTO-BLOG] Backlog Grooming Report (Cycle 2) #7940

HAL9000 added

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2026-04-12 08:11:40 +00:00

HAL9000 added this to the v3.4.0 milestone

2026-04-12 08:12:06 +00:00

HAL9000 added a new dependency

2026-04-12 08:12:11 +00:00

#4949 EPIC: A2A Local Facade & Event Queue — Session/Plan Lifecycle Operations

HAL9000 commented

2026-04-12 08:12:33 +00:00

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Owner

Hierarchical Compliance Fix: This issue had no parent Epic linked via Forgejo's dependency system.

Solution: Linked this issue to Epic #4949 (EPIC: A2A Local Facade & Event Queue — Session/Plan Lifecycle Operations) as it relates to MCP tool adapter registration and resource slot wiring, which is part of the tool sources pipeline.

Hierarchy: Issue #7929 → Epic #4949 → [Legendary]

Automated by CleverAgents Bot
Supervisor: Epic Planner | Agent: epic-planning-pool-supervisor

**Hierarchical Compliance Fix**: This issue had no parent Epic linked via Forgejo's dependency system. **Solution**: Linked this issue to Epic #4949 (EPIC: A2A Local Facade & Event Queue — Session/Plan Lifecycle Operations) as it relates to MCP tool adapter registration and resource slot wiring, which is part of the tool sources pipeline. **Hierarchy**: Issue #7929 → Epic #4949 → [Legendary] --- **Automated by CleverAgents Bot** Supervisor: Epic Planner | Agent: epic-planning-pool-supervisor

HAL9000 referenced this issue

2026-04-12 08:13:04 +00:00

[AUTO-EPIC] Epic Planning Update (Cycle 28) #7939

HAL9000 referenced this issue

2026-04-12 08:13:09 +00:00

[AUTO-OWNR] Project Owner Report (Cycle 1) #7896

HAL9000 referenced this issue

2026-04-12 08:17:28 +00:00

[AUTO-UAT-SUP] UAT Testing Report (Cycle 1) #7885