dependency-manager - Dependency Visualization, Creation and Diagnosis

Manage blocks and relates_to edges between work items: view them, create them, delete them and diagnose why an item cannot start. Shapes are in _generated/call-shapes.md (deps_read, deps_write); semantics are in current/docs/api-reference.md ("deps_read", "deps_write"). Ids below are 8-hex shorts and any item id field also takes the full UUID. Read every answer through the envelope: ok, then data.results[i] (ok or error) and data.summary {ok, failed}. When a write element fails, the call-level error is only partial_failure (no detail, no fix): read code, kind (retry class), detail and fix from data.results[i].error. A read (select) call reports its failure in the call-level error.

Step 1: Determine intent

Resolve $ARGUMENTS to an item id with a search; if several match, show them via AskUserQuestion. An argument that is already an id defaults to VIEW.

{"tool": "items_read", "select": "search", "args": {"query": "REST endpoints", "kinds": ["item"], "limit": 5}}

With no argument, infer the intent from the conversation, else ask: "What would you like to do with dependencies? view, create, delete or diagnose?" For a compound request (show what blocks this, then remove it) do VIEW first, then act on the result.

Step 2: View dependencies

{"tool": "deps_read", "select": "list", "args": {"item": "4b7d0e19", "direction": "all"}}

data.items[] is {id, from, to, type, unblockAt?} with full UUIDs; from blocks to. incoming is the edges whose to is the item (what blocks it), outgoing those whose from is the item. type filters to blocks or relates_to. Titles and roles are not in the edge: read the other ends with items_read get (or list). Draw a tree:

* Design API schema (work)
  |-- blocks --> o Implement data models (queue)
  |-- blocks --> o Build REST endpoints (queue)
  `-- blocked by <-- * Finalize data contract (work)

Symbols: v terminal, * work or review, o queue, x blocked. For the whole chain around the item:

{"tool": "deps_read", "select": "graph", "args": {"item": "4b7d0e19"}}

data.items[] is {id, level} (blockers first; level 0 has no blocker) or {id, cyclic: true}; blocks edges only, relates_to is ignored. After the tree, offer DIAGNOSE for any blocked item.

Step 3: Create dependencies

Pick the shape from what the user described:

A pattern is one unit: all its edges are created or none (a duplicate or a cycle anywhere leaves nothing written). Confirm the derived edges first ("About to create A -> B -> C -> D as a chain. Proceed?"). type is lowercase blocks (default) or relates_to; the old IS_BLOCKED_BY alias is rejected, so name the blocker as from.

{"tool": "deps_write", "op": "linear", "args": {"ids": ["4b7d0e19", "6e21c0aa", "9f3a1c22", "0b6d4e11"]}}

{"tool": "deps_write", "op": "create", "args": {"from": "4b7d0e19", "to": "6e21c0aa", "type": "blocks", "unblockAt": "review"}}

Several ops can share one deps_write call (ops[]); each commits on its own unless atomic is true. The answer is {id, from, to, type, unblockAt?} for create and {created: [edge, ...]} for a pattern. A blocks edge to or from a lifecycle-free item is invalid_request; relates_to is allowed. Report:

Created 3 edges: A blocks B, B blocks C, C blocks D

Step 4: Delete dependencies

List the edges first so the user can choose:

{"tool": "deps_read", "select": "list", "args": {"item": "6e21c0aa", "direction": "all"}}

Show them with their id, confirm, then delete in one of three modes:

{"tool": "deps_write", "op": "delete", "args": {"from": "4b7d0e19", "to": "6e21c0aa", "type": "blocks"}}

The answer is {deleted: n}. An unknown id is not_found; a pair or item that matches nothing deletes 0.

Step 5: Diagnose blocked items

One item. Read its incoming edges and its gate state:

{"tool": "deps_read", "select": "list", "args": {"item": "4b7d0e19", "direction": "incoming"}}

{"tool": "items_read", "select": "context", "args": {"itemId": "4b7d0e19"}}

gateStatus.blockedBy names the first failing gate (table, dependency, note, lease); for a dependency block blockers[] lists {id, role?, threshold} for the unsatisfied ones, and for a lease block contended lists the resource keys.

Broad view. All blocked work, or one subtree:

{"tool": "items_read", "select": "blocked", "args": {"ancestorId": "98d452e9"}}

Each entry has blockType (explicit for the blocked role, dependency for an unmet edge) and blockers[] with threshold and satisfied for EVERY blocking edge, satisfied ones included. An explicit entry also has reason; an awaiting_decision entry adds decisionId and resumable.

For each unsatisfied blocker decide what must happen:

x "Build REST endpoints" cannot start because:
  Blocker 1: Design API schema (work)   must reach terminal
  Blocker 2: Write OpenAPI spec (queue) must reach terminal

Not every "cannot start" is a dependency. A resource_unavailable failure (transient) on start means a shared resource the item's traits declare is held by another item; the item stays in its role and no edge exists. If no incoming edge explains the symptom, look at context contended and resourceLeases and treat it as contention, not a dependency problem.

Then point to the fix: /status-progression on the blocker, or fill its missing notes with notes_write.

Reference

Troubleshooting

`cycle_detected` on create. The edge or pattern would close a loop (data.results[i].error.detail.path). One edge is backwards: flip from and to.

`duplicate`. The edge exists already; list it instead.

Item is still blocked after the blocker finished. Either unblockAt names a role the blocker has not reached, or other incoming edges remain. List incoming edges and check each blocker. If every blocker is satisfied and the item sits in the blocked role, an explicit block is the cause: resume it via /status-progression.

`not_found` on delete by `id`. The edge is gone or the id is from elsewhere. List again and use an id from the fresh answer.

Wrong pattern fields. linear takes ids; fan_out takes from and toIds; fan_in takes fromIds and to. A wrong name is unknown_parameter. Re-list the item and delete incorrect edges with Step 4.

Examples

View. "Show me what blocks the REST endpoints task." Search gives 6e21c0aa; list incoming edges, read the two blocker items, and draw: both blockers must reach terminal; use /status-progression on each.

Chain. "Set up A, B, C, D as a chain." Resolve the ids, confirm, send one linear op, report 3 edges.

Diagnose. "Why can't Write integration tests start?" List incoming edges, read context for blockers[], report the two unsatisfied blockers and recommend completing them.

Quick decision guide