lisa-prd-backlink

name	lisa-prd-backlink
description	Update a source PRD with an always-written, machine-readable `## Tickets` (alias `## Generated Work`) section linking back to every work item created from it. Each entry carries a parseable ref + URL + type + parent token so the generated child set is readable without scraping prose. Vendor-aware on the source side (Notion / Confluence / Linear / GitHub Issue / file) and tracker-agnostic on the ticket side; the documented section is written for every vendor, additive to native hierarchy linking. Idempotent — regenerates the section on each run rather than appending, so re-planning never accumulates stale links. Invoked by the *-to-tracker skills at the end of their pipeline and standalone if a PRD's Tickets section needs to be refreshed.
allowed-tools	["Skill","Bash","Read","Edit","Write","Glob","Grep"]

PRD Back-link

Write or update the ## Tickets section of a source PRD so it links to every work item created from that PRD. The Debrief flow (and a human reading the PRD months later) uses this section as the canonical work-item set for the initiative.

This documented section is the always-written, machine-readable record of the generated child set. It is written for every source_type — including the vendors that also get a native hierarchy link (github / linear / jira) — so the generated top-level work is readable later from the PRD body alone, without parsing free-form comments or depending on a native relationship that may be unavailable on older hosts or across vendors. Native hierarchy linking (see the per-vendor sections below) is additive to this section, never a substitute for it. This is the documented-section leg of the prd-lifecycle-rollup rule (cited by slug; its taxonomy is not restated here).

Input

Pass $ARGUMENTS as a single JSON-style block:

{
  "source_type": "notion" | "confluence" | "linear" | "github" | "file",
  "source_ref": "<URL, page id, project id, issue ref, or absolute file path>",
  "tickets": [
    { "key": "<tracker-key>", "title": "<summary>", "type": "Epic|Story|Task|Sub-task|Bug|Spike", "url": "<link>", "parent_key": "<key or null>", "requirements": ["R1", "R3"] }
  ],
  "requirement_register": [
    { "id": "R1", "verbatim_text":    
  
      

Behaviour

1. Fetch the current PRD content using the source's native read tool:

   • notion → notion-fetch
   • confluence → getConfluencePage
   • linear → Linear MCP project / issue read
   • github → gh issue view
   • file → Read tool on the absolute path

2. Locate the existing section. Search for section_heading (default ## Tickets). The canonical heading is ## Tickets; ## Generated Work is an accepted alias that the reader recognizes — match either heading when locating an existing section so a PRD authored with either name is found and regenerated in place (never duplicated under the other name). If present under either name, you will replace it (keeping whichever heading was already there, or the explicit section_heading override). If not present, you will append a new section just before any closing footer / sign-off / signature block, otherwise at the end.

3. Render the section. Always render it — for every source_type, even when a native hierarchy link was also made (additive, not exclusive). Use the format below. Group by Epic. Within an Epic, group by Story. Sub-tasks nest under their Story. Bugs and Spikes that are not under a Story go in a flat list at the bottom. Each entry carries a machine-readable token (ref + URL + type + parent) so the generated child set is parseable without reading prose — see Format.

4. Write the updated PRD back using the source's native write tool:

   • notion → notion-update-page
   • confluence → updateConfluencePage
   • linear → Linear MCP update
   • github → gh issue edit --body
   • file → Edit (preferred) or Write (full rewrite if needed)

5. Record the PRD→child relationship in the source tool's native hierarchy where the source supports it and the destination tracker is the same system. Each supported source has its own native-linking section, all governed by the same generated-top-level-work contract, child-ref idempotency, and graceful-degradation discipline from the rule:

Format

The rendered section must be deterministic — same inputs produce identical output bytes. This is what makes idempotency reliable. Every entry is simultaneously human-readable (a nested markdown link) and machine-readable (a trailing structured token), so the generated child set can be enumerated by parsing this section alone — the contract LPC-1.3 rollup (github-prd-intake / *-prd-intake) reads against, with no need to scrape free-form comments.

## Tickets

_Generated by `lisa-prd-backlink`. Regenerated on every Plan run; do not edit by hand._

### Requirement coverage

- **R1** §"<PRD heading>": "<verbatim requirement text>" — [<key>](<url>), [<key>](<url>)
- **R2** §"<PRD heading>": "<verbatim requirement text>" — _no tickets — gap_

### <Epic key>: <Epic title>

- [<Epic key>](<url>) — Epic <!-- lisa:gw ref=<ref> url=<url> type=Epic parent= -->
  - [<Story key>](<url>) — Story: <title> <!-- lisa:gw ref=<ref> url=<url> type=Story parent=<Epic > -->
 []() — Sub-task:  <!-- lisa:gw ref= url= type=Sub-task parent= -->
 []() — Sub-task:  <!-- lisa:gw ref= url= type=Sub-task parent= -->
 []() — Story:  <!-- lisa:gw ref= url= type=Story parent= -->


...



 []() — Bug:  <!-- lisa:gw ref= url= type=Bug parent= -->
 []() — Spike:  <!-- lisa:gw ref= url= type=Spike parent= -->

Machine-readable entry token

Every list entry ends with a single-line HTML comment — invisible in rendered markdown, so the section stays clean for humans, but a stable, greppable record for machines:

<!-- lisa:gw ref=<ref> url=<url> type=<type> parent=<parent-ref or empty> reqs=<comma-separated requirement ids or empty> -->

• lisa-gw — a fixed sentinel (gw = generated work). A reader enumerates the generated child set by matching <!-- lisa:gw lines; it never has to parse the surrounding prose, headings, or indentation.
• ref — the child-ref identity from the prd-lifecycle-rollup rule: <org>/<repo>#<n> for GitHub, the issue/project identifier (e.g. TEAM-123) for Linear, the issue key (e.g. PROJ-123) for JIRA. This is the same dedupe key native linking uses, so the documented record and the native record agree.
• url — the canonical URL of the work item.
• type — Epic | Story | Task | Sub-task | Bug | Spike (verbatim from the ticket's type).
• parent — the ref of this entry's parent (its parent_key resolved to the parent's ref), or empty when the entry is top-level (parent_key null/empty). A reader selects the generated top-level child set — exactly what the PRD owns per the rule — as every lisa-gw line whose parent is empty.
• reqs — comma-separated requirement register ids (R1,R3) the ticket's requirements list declares, or empty for derived work or tickets created before traceability. This makes the requirement → tickets mapping parseable from the PRD alone: a reader answers "which tickets carry R3?" by matching reqs= tokens, deterministically — no inference.

The visible markdown link and the token always carry the same ref/url/type; the token is the authoritative machine field (the prose may wrap or be reflowed by a host editor, the comment line will not). Field order within the token is fixed (ref, url, type, parent, reqs) so output is byte-stable.

If the input contains zero items, write the section header with a single line: _No tickets created — Plan flow may not have completed._ Do not omit the section; presence-of-section is itself a signal to Debrief, and the always-written guarantee means a reader can always distinguish "ran, produced nothing" from "never ran."

Idempotency

Rendering rules:

• Sort epics by key (lexical). Sort stories within an epic by key. Sort sub-tasks within a story by key. Sort the unparented list by (type, key). The same sort applies to the lisa-gw tokens (each token sits on its entry's line), so the machine-readable order is identical across runs.
• The line _Generated by ..._ is fixed text — does not include a timestamp. A timestamp would defeat the diff-equality check Debrief relies on.
• Regenerate the whole section from the current ticket set on every run — never append. Dedupe is by child-ref (the token's ref, per the prd-lifecycle-rollup idempotency dedupe key): the same ticket set produces a byte-identical section with no duplicate entries, and re-running over an existing section is a no-op diff. A ticket present in a prior run but absent now simply does not reappear (stale links never accumulate).
• Match by stable ref, never by title (prd-lifecycle-rollup idempotency dedupe key). A child is identified by its ref token alone — a ticket whose title changed but whose ref is unchanged is the same entry: its displayed title is refreshed in place and it appears exactly once, never duplicated. Title is rendered, never matched on.

Native parent linking (GitHub)

When source_type: github and the PRD issue lives in the same repository as the created tickets, make the PRD the structural parent of the work it generated by linking each generated top-level work item as a native GitHub sub-issue of the PRD issue. This is the GitHub leg of the PRD→child native-hierarchy requirement in the prd-lifecycle-rollup rule (cite it by slug; do not restate its taxonomy here). The documented ## Tickets section is still written either way — native linking is the first-class relationship; the documented section is the durable fallback for cross-vendor and older hosts.

This section is GitHub-only. The Linear and JIRA native parents have their own sections below (Linear, JIRA); the documented-section-only fallback for Notion / Confluence / file / cross-vendor sources is governed by the prd-lifecycle-rollup rule and is out of scope for this GitHub section.

What gets linked — generated top-level work only

Per the prd-lifecycle-rollup "generated top-level work" contract, the PRD owns only its generated top-level work as direct children:

• A ticket is top-level when its parent_key is null/empty — these are the created Epic(s) and any top-level Story created directly under the PRD. Link these as sub-issues of the PRD.
• A ticket with a non-null parent_key is a descendant (a Story under an Epic, or a leaf Sub-task) — it is owned by its own top-level parent, never linked directly to the PRD. Leaf Sub-tasks are explicitly NOT direct PRD children (PRD #525 non-goal).

So if the PRD generated Epic E1 → Story S1 → Sub-task T1, only E1 becomes a sub-issue of the PRD; S1 is a sub-issue of E1 and T1 of S1 (those links were already made by the write path), and neither S1 nor T1 is a direct child of the PRD.

Same-repo guard

Native sub-issue linking only applies when the PRD and the work item are in the same repository. Parse owner/repo from source_ref (the PRD URL or <org>/<repo>#<n> token) and from each top-level ticket's key/url. Skip native linking for any ticket whose repo differs from the PRD's repo (cross-repo or cross-vendor) — record those in the documented section only. The cross-vendor case (e.g. a GitHub PRD with a JIRA/Linear tracker) never reaches this path because the ticket is not a GitHub issue.

Idempotency — dedupe by child-ref

The dedupe key is child-ref identity (owner/repo#number), per the prd-lifecycle-rollup idempotency rule. Before adding any link, read the PRD's current sub-issues and skip any child already linked, so re-running prd-backlink never creates duplicate sub-issue links and is a no-op when everything is already linked.

1. Read the PRD's existing sub-issues (same GraphQL subIssues query lisa-github-read-issue Phase 3 uses), and build the set of already-linked child refs:

   gh api graphql -f query='query($org:String!,$repo:String!,$number:Int!){repository(owner:$org,name:$repo){issue(number:$number){subIssues(first:100){nodes{number repository{nameWithOwner}}}}}}' \
     -F org=<prd_org> -F repo=<prd_repo> -F number=<prd_number> \
     --jq '.data.repository.issue.subIssues.nodes[] | "\(.repository.nameWithOwner)#\(.number)"'
   

   The resulting owner/repo#number strings are the existing child-ref set.

2. For each generated top-level ticket in the same repo whose child-ref is not already in that set, resolve node IDs and call addSubIssue (the same mutation lisa-github-write-issue Phase 6 step 3 uses):

   prd_id=$(gh api graphql -f query='query($org:String!,$repo:String!,$number:Int!){repository(owner:$org,name:$repo){issue(number:$number){id}}}' -F org=<prd_org> -F repo=<prd_repo> -F number=<prd_number> --jq '.data.repository.issue.id')
   child_id=$(gh api graphql -f query='query($org:String!,$repo:String!,$number:Int!){repository(owner:$org,name:$repo){issue(number:$number){id}}}' -F org=<org> -F repo=<repo> -F number=<child_number> --jq '.data.repository.issue.id')
   gh api graphql -f query='mutation($parentId:ID!,$childId:ID!){addSubIssue(input:{issueId:$parentId,subIssueId:$childId}){issue{number}subIssue{number}}}' -F parentId="$prd_id" -F childId="$child_id"
   

   A child already in the existing-sub-issue set is a no-op — do not call the mutation for it.

Graceful degradation

• Already linked. Covered by the dedupe read above (no mutation issued). If a concurrent run linked it between the read and the mutation, GitHub rejects the duplicate — treat that rejection as success (the desired end state already holds), not a failure.
• Mutation unavailable (older GHES, sub-issues feature off, or the addSubIssue/subIssues fields are missing). Fall back to the documented ## Tickets section only and surface a warning to the caller (native sub-issue linking unavailable — documented section written). Never silently drop the relationship and never abort the run — the documented section is the contract that always lands.

Native parent linking (Linear)

When source_type: linear and the PRD also lives in Linear (same workspace as the created work items), make the PRD the structural parent of the work it generated using Linear's native parent / project relationship. This is the Linear leg of the PRD→child native-hierarchy requirement in the prd-lifecycle-rollup rule (cite it by slug; do not restate its taxonomy here). The documented ## Tickets section is still written either way — native linking is the first-class relationship; the documented section is the durable fallback for cross-vendor and older hosts.

This section is Linear-only. The GitHub and JIRA native parents have their own sections; the documented-section-only fallback for Notion / Confluence / file / cross-vendor sources is out of scope here.

Which Linear primitive — PRD shape decides

Linear models top-level grouping two ways, and the PRD's own entity type decides which native relationship to use:

• PRD is a Linear Project (the common case — a PRD project groups its generated work). Generated top-level Issues are attached to the PRD by setting their projectId to the PRD Project's id. The Project is the native parent of its Issues; no separate parent-issue link is needed.
• PRD is a Linear Issue (a parent issue, not a project). Generated top-level Issues are attached as native sub-Issues of the PRD Issue by setting their parentId to the PRD Issue's id.

Either way the write surface is lisa-linear-access operation: save-issue with the single relevant field (projectId or parentId) — the same primitive lisa-linear-write-issue uses to set a Story's projectId (Epic Project) and a Sub-task's parentId (Story Issue). Send only that field on update; Linear treats save_issue as a full overwrite of the fields named (lisa-linear-write-issue Phase 6 UPDATE), so resending other fields would clobber them.

What gets linked — generated top-level work only

Per the prd-lifecycle-rollup "generated top-level work" contract, the PRD owns only its generated top-level work as direct children:

• A work item is top-level when its parent_key is null/empty — these are the created Epic(s) (Linear Projects) and any top-level Story (Linear Issue) created directly under the PRD. Attach these to the PRD via projectId/parentId.
• A work item with a non-null parent_key is a descendant (a Story under an Epic Project, or a leaf Sub-task) — it is owned by its own top-level parent, never linked directly to the PRD. Leaf Sub-tasks are explicitly NOT direct PRD children (PRD #525 non-goal); their parentId already points at their Story (set by the write path), and overwriting it to point at the PRD would break that hierarchy.

So if the PRD generated Epic E1 (Project) → Story S1 (Issue) → Sub-task T1 (sub-Issue), only the top-level unit is attached to the PRD; S1 already carries projectId = E1 and T1 already carries parentId = S1 (set by the write path), and neither S1 nor T1 is a direct child of the PRD.

Idempotency — dedupe by child-ref

The dedupe key is child-ref identity — the Linear issue/project identifier (e.g. TEAM-123) or its UUID — per the prd-lifecycle-rollup idempotency rule. Before attaching any child, read the PRD's current children and skip any child already attached, so re-running prd-backlink never duplicates a relationship and is a no-op when everything is already attached.

1. Read the PRD's existing children (the same reads lisa-linear-read-issue uses for Project members and sub-Issues):

   • PRD-as-Project → lisa-linear-access operation: list-issues({project: <prd_project_id>}) and collect each member Issue's identifier/UUID.
   • PRD-as-Issue → lisa-linear-access operation: get-issue({id: <prd_issue_id>}) and collect its sub-Issue identifiers/UUIDs.

   The resulting identifiers/UUIDs are the existing child-ref set.

2. For each generated top-level item whose child-ref is not already in that set, attach it with a single-field save_issue:

   • PRD-as-Project → lisa-linear-access operation: save-issue({id: <child_id>, projectId: <prd_project_id>}).
   • PRD-as-Issue → lisa-linear-access operation: save-issue({id: <child_id>, parentId: <prd_issue_id>}).

   A child already in the existing-children set is a no-op — do not issue the save_issue call for it. Reading the child's current projectId/parentId and finding it already equal to the PRD's id is the same no-op (attaching to the value it already holds changes nothing).

Graceful degradation

• Already attached. Covered by the dedupe read above (no write issued). If a concurrent run attached it between the read and the write, re-setting the same projectId/parentId is harmless (the desired end state already holds) — treat it as success, not a failure.
• No native hierarchy / cross-vendor. If the PRD is not itself a Linear entity (cross-vendor — e.g. a Notion PRD with a Linear tracker, which reaches this skill as source_type: notion, not linear), or the workspace/team does not expose the relationship, this is a clean no-op: fall back to the documented ## Tickets section only and surface a warning to the caller (native Linear parent linking unavailable — documented section written). Never silently drop the relationship and never abort the run — the documented section is the contract that always lands.

Native parent linking (JIRA)

When source_type: jira and the PRD also lives in the same JIRA/Atlassian instance as the created tickets, make the PRD the structural parent of the work it generated using JIRA's native parent / Epic link, or — where the instance does not allow an Epic/Story to be a child of the PRD's issue type — a documented issue-link type (e.g. relates to). This is the JIRA leg of the PRD→child native-hierarchy requirement in the prd-lifecycle-rollup rule (cite it by slug; do not restate its taxonomy here). The documented ## Tickets section is still written either way — native linking is the first-class relationship; the documented section is the durable fallback for cross-vendor and older hosts.

This section is JIRA-only. The GitHub and Linear native parents have their own sections; the documented-section-only fallback for Notion / Confluence / file / cross-vendor sources is out of scope here.

Which JIRA primitive — native parent first, issue-link fallback

JIRA's hierarchy support varies by instance and issue-type scheme, so prefer the strongest relationship the instance allows:

1. Native parent / Epic link (preferred). If the PRD's issue type can be a parent of the generated top-level type in the instance's hierarchy (e.g. the PRD is a parent-level issue and the generated work is Epics/Stories beneath it), set the generated top-level issue's parent to the PRD — the same parent/Epic-link surface lisa-jira-write-ticket uses to set a Story's epic parent (Phase 4a + Phase 6 CREATE). Use lisa-atlassian-access operation: write-ticket payload: {key: <child>, parent: <prd_key>} (send only the parent field on update so other fields are preserved — lisa-jira-write-ticket Phase 6 UPDATE).
2. Documented issue-link type (fallback). If the instance's hierarchy does not allow the PRD to parent the generated type (common when both are Epics, or the PRD is itself an Epic and Epics cannot nest), create a native issue link of a documented type instead — lisa-atlassian-access operation: link from: <prd_key> to: <child_key> type: "<link-type>" — the same link surface lisa-jira-write-ticket Phase 6 step 3 uses for blocks / relates to / etc. Use the project's configured PRD→work link type (default relates to); surface an error if an unknown type is passed rather than inventing one.

Choosing between (1) and (2) is per the instance's capability — never invent a parent relationship the issue-type scheme rejects, and never silently downgrade without recording which relationship was used.

What gets linked — generated top-level work only

Per the prd-lifecycle-rollup "generated top-level work" contract, the PRD owns only its generated top-level work as direct children:

• A ticket is top-level when its parent_key is null/empty — these are the created Epic(s) and any top-level Story created directly under the PRD. Attach these to the PRD via the native parent or the documented issue-link type.
• A ticket with a non-null parent_key is a descendant (a Story under an Epic, or a leaf Sub-task) — it is owned by its own top-level parent, never linked directly to the PRD. Leaf Sub-tasks are explicitly NOT direct PRD children (PRD #525 non-goal); their parent already points at their Story/Epic (set by the write path), and re-parenting them to the PRD would break that hierarchy.

So if the PRD generated Epic E1 → Story S1 → Sub-task T1, only E1 is attached to the PRD; S1 already carries its epic parent E1 and T1 its parent S1 (set by the write path), and neither S1 nor T1 is a direct child of the PRD.

Idempotency — dedupe by child-ref

The dedupe key is child-ref identity — the JIRA issue key (e.g. PROJ-123) — per the prd-lifecycle-rollup idempotency rule. Before attaching any child, read the PRD's current children/links and skip any child already attached, so re-running prd-backlink never duplicates a parent assignment or issue link and is a no-op when everything is already attached.

1. Read the PRD's existing children and links (the same reads lisa-jira-read-ticket uses):

   • Native-parent path → enumerate the PRD's children via the epic-link/parent JQL lisa-jira-read-ticket Phase 5 uses ("Epic Link" = <PRD-KEY> or parent = <PRD-KEY>), and collect their keys.
   • Issue-link path → read the PRD's issuelinks (lisa-jira-read-ticket Phase 4) and collect the keys already linked with the configured PRD→work link type.

   The resulting issue keys are the existing child-ref set.

2. For each generated top-level ticket whose key is not already in that set, attach it via the chosen primitive:

   • Native-parent → lisa-atlassian-access operation: write-ticket payload: {key: <child>, parent: <prd_key>}.
   • Issue-link → lisa-atlassian-access operation: link from: <prd_key> to: <child> type: "<link-type>".

   A child already in the existing-children/links set is a no-op — do not issue the write/link for it.

Graceful degradation

• Already attached. Covered by the dedupe read above (no write issued). If a concurrent run attached it between the read and the write, JIRA either no-ops the identical parent assignment or rejects the duplicate link — treat that as success (the desired end state already holds), not a failure.
• No native hierarchy / cross-vendor. If the PRD is not itself a JIRA issue (cross-vendor — e.g. a Notion or Confluence PRD with a JIRA tracker, which reaches this skill as source_type: notion/confluence, not jira), or neither a native parent nor a documented issue-link type is available in the instance, this is a clean no-op: fall back to the documented ## Tickets section only and surface a warning to the caller (native JIRA parent linking unavailable — documented section written). Never silently drop the relationship and never abort the run — the documented section is the contract that always lands.

Failures

• Source unreachable / permission denied. Stop and report. Do not silently swallow.
• Section already present but in a non-standard format (e.g., user hand-edited it). Replace it anyway — the warning line _do not edit by hand_ is the contract. Note in the run output that an existing section was overwritten.
• Source is a Notion database URL, a Confluence space URL, or any other non-page input. Stop — back-linking only makes sense against a single PRD page, not a queue. Direct the caller to pass the specific page.

Output

PRD back-link updated: <source_url>
Section: ## Tickets — <n> epics, <n> stories, <n> sub-tasks, <n> unparented (<bugs/spikes>)
Native parent links: <n> linked, <n> already linked (<vendor> native hierarchy; documented section is the fallback)

The Native parent links line reports whichever vendor's native linking ran:

• GitHub (same-repo PRD) → sub-issues via addSubIssue.
• Linear (PRD in Linear) → projectId/parentId attachments via save_issue.
• JIRA (PRD in JIRA) → native parent / Epic link, or documented issue-link type.

Omit the Native parent links line when no native linking applies (Notion / Confluence / file source, or any cross-vendor combination — documented section only). If native linking was attempted but unavailable for the vendor, replace the counts with the degradation warning from that vendor's Graceful degradation subsection.

Related rules

• prd-lifecycle-rollup — the vendor-neutral source of truth for PRD→generated-top-level-work ownership, the per-vendor terminal predicate, PRD shipped rollup, and the child-ref idempotency dedupe key. This skill implements both the documented always-written, machine-readable generated-work section leg (the universal fallback written for every vendor) and the GitHub, Linear, and JIRA native-linking legs of that rule; it cites the rule by slug rather than restating its taxonomy.