KeiSeiKit-1.0/_primitives/_rust/kei-task/atoms/add-dependency.md
Parfii-bot 0be354a920 KeiSeiKit-public — clean state
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Contents:
- 100 Rust crates (_primitives/_rust/)
- 37 agent manifests (_manifests/) + generated specs (_generated/)
- 67 user-invocable skills (skills/)
- 33 hooks (hooks/)
- Composition blocks (_blocks/)
- Documentation (docs/, README.md)
- TS adapter packages (_ts_packages/)
- Assembler (_assembler/)
- Roles (_roles/)
- Templates (_templates/)
- Forgejo CI (.forgejo/)

Author: Denis Parfionovich <info@greendragon.info>

License: see LICENSE.
2026-05-01 12:09:03 +08:00

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---
atom: kei-task::add-dependency
kind: command
version: "0.1.0"
input:
schema: schemas/add-dependency-input.json
required: [from, to]
example: { from: 42, to: 17, dep_type: "blocks" }
output:
schema: schemas/add-dependency-output.json
example: { ok: true }
errors:
- code: SelfDependency
http_analog: 400
description: "A task cannot depend on itself"
- code: InvalidDepType
http_analog: 400
description: "dep_type must be one of: blocks, feeds_into, subtask_of, milestone_of, assigned_to, depends_on"
- code: CycleDetected
http_analog: 409
description: "The new edge would close a cycle in the task DAG"
- code: StoreError
http_analog: 500
description: "Underlying SQLite store failed to insert the dependency row"
side_effects:
- { op: write, domain: kei-task-db }
idempotent: false
timeout_ms: 5000
deprecated: null
stability: stable
keywords: [task, dependency, dag, blocks, graph]
related:
- "[[kei-task::create]]"
---
# kei-task::add-dependency
Inserts a typed edge `from -> to` in the task DAG, rejecting cycles
and self-loops at write time. Edge is stored idempotently via
`INSERT OR IGNORE` — re-adding the same triple is a no-op.
## Example
kei-task add-dependency 42 17 --dep-type blocks
Stdout:
dep: 42 -> 17 (blocks)
Programmatic callers receive:
{ "ok": true }
## Gotchas
- `dep_type` defaults to `"blocks"`. Empty string is also treated as
`"blocks"` for CLI convenience.
- Cycle check is transitive — the implementation walks the existing
DAG from `to` and refuses if it can reach `from`.
- Both task ids must already exist; missing ids do NOT surface a
dedicated error code in the current impl and bubble up as
`StoreError` via foreign-key violation.
- Re-adding an existing edge is silently idempotent (`INSERT OR
IGNORE`) even though the atom declares `idempotent: false` — that
flag reflects the CONTRACT (callers should not rely on retry
semantics), not the specific SQL behaviour.
## Related
- [[kei-task::create]] — create endpoints of the edge first