ServiceNow Developer Skill

ServiceNow development and architecture guidance across classic scripting, platform configuration, workflow automation, workspace UX, domain apps, and enterprise delivery practices.

Instructions

Step 1: Triage the request before writing code

Always identify:

1. The product family or workflow domain.
2. Whether the solution is server-side, client-side, Flow Designer, UI Builder, Service Portal, Virtual Agent, or API-driven.
3. Whether the user is working in global scope or a scoped app.
4. The target table, plugins, roles, and release assumptions if they affect the answer.
5. Whether the task is read-only, transactional, or security-sensitive.

Load the minimum set of reference files that matches the task. For cross-cutting work, load 2-3 references and reconcile them before answering.

Step 2: Apply ServiceNow platform standards

All generated code and recommendations should follow these rules:

1. Use getValue() and setValue() for GlideRecord or current data access and mutation. GlideElement methods like changes(), changesTo(), nil(), and setDisplayValue() are acceptable when needed.
2. Never hardcode credentials, OAuth profile sys_ids, or environment-specific secrets. Prefer REST Message records, Connection & Credential Aliases, and system properties.
3. In scoped apps, treat GlideRecord.get() as a boolean-returning operation and always check the result before reading fields.
4. Use GlideAggregate for counts and aggregates; do not call addAggregate() on GlideRecord.
5. Use setLimit() on exploratory or user-facing queries unless the workflow explicitly needs the full result set.
6. Prefer encoded queries only for static, known-safe complex filters. If any part comes from user input, sanitize it or use discrete addQuery() calls.
7. Use async Business Rules, events, or scheduled jobs for heavy work. Do not block the transaction with slow integrations.
8. Avoid current.update() in Before Business Rules. If you must update from an After rule or UI Action, explain the recursion risk and use setWorkflow(false) deliberately.
9. Use async GlideAjax patterns only; never use getXMLWait().
10. Call out required plugins, roles, cross-scope privileges, and release-specific assumptions whenever they matter.
11. For Vulnerability Response, Security Incident Response, SAM Pro, and IntegrationHub, favor data-driven workflows and named configuration records over scripted constants.

Step 3: Validate before you return anything

Before responding:

• Confirm the code matches the correct execution context.
• Check for recursion, N+1 queries, unbounded queries, and unsafe auth patterns.
• Verify reference-field logic uses internal values for writes and explicit display-value APIs only when needed.
• Include deployment notes if the change depends on plugins, update sets, app repo, or CI/CD.
• Include a test path: ATF, background script smoke test, Flow execution test, or manual validation steps.

Common gotchas

• gr.field returns a GlideElement, not a plain string. Use getValue() unless you specifically need GlideElement behavior.
• g_form, g_user, and g_list are client APIs only.
• getRowCount() is not a cheap count.
• addEncodedQuery(userInput) is an injection risk.
• Business Rules on sys_dictionary or sys_db_object can destabilize an instance.
• Querying by display value such as assignment_group.name is sometimes useful for examples, but sys_id-based queries are safer and faster in production code.
• Record Producers and inbound actions should usually populate current and let the platform handle persistence rather than forcing extra updates.
• CSDM guidance should preserve layer boundaries and ownership semantics rather than inventing custom service hierarchies.
• IntegrationHub solutions should specify connection aliases, credential ownership, retries, and rate-limit behavior.

Fast patterns

Use these without loading a reference file when the request is simple and clearly matches the pattern.

Safe GlideRecord query

var gr = new GlideRecord('incident');
gr.addActiveQuery();
gr.addQuery('priority', '1');
gr.setLimit(50);
gr.query();

while (gr.next()) {
    gs.info(gr.getValue('number') + ' ' + gr.getValue('short_description'));
}

Scoped-safe single-record lookup

var user = new GlideRecord('sys_user');
if (!user.get(userSysId)) {
    gs.addErrorMessage('User not found');
    return;
}

gs.info(user.getValue('email'));

CLI Helper

# Generate queries
python3 skills/servicenow/scripts/snow_helper.py query "find active incidents assigned to me"
python3 skills/servicenow/scripts/snow_helper.py query "find all work orders in state Dispatch Pending"

# Generate templates
python3 skills/servicenow/scripts/snow_helper.py template business-rule --table incident --when before --insert --update
python3 skills/servicenow/scripts/snow_helper.py template scripted-rest-api --table incident
python3 skills/servicenow/scripts/snow_helper.py template flow-script-action --table incident
python3 skills/servicenow/scripts/snow_helper.py template atf-server-test --table incident
python3 skills/servicenow/scripts/snow_helper.py template integrationhub-action --table incident

# Lint a script
python3 skills/servicenow/scripts/snow_helper.py lint < myscript.js

# Validate the skill package and bundled references
python3 skills/servicenow/scripts/snow_helper.py validate-skill skills/servicenow

Examples

Example 1: ITSM query

User says: "Write a query to find all P1 incidents opened this week"

Actions: Load references/glide-api.md and references/itsm.md, generate a safe query, and check for limits and boolean get() usage.

Example 2: Scripted REST

User says: "Create a REST endpoint that returns user details by employee number"

Actions: Load references/rest-api.md, return a Scripted REST resource with 400/404 handling, note required ACLs, and include a test call.

Example 3: ITAM lifecycle

User says: "How do I reclaim laptops from terminated employees and update stockroom state?"

Actions: Load references/itam.md and references/flow-designer.md, propose a reclamation flow, asset-state transitions, and HAM role assumptions.

Example 4: FSM dispatch

User says: "Build a flow to auto-assign field work orders by territory and skills"

Actions: Load references/fsm.md and references/flow-designer.md, design dispatch logic, scheduling constraints, and technician/mobile validation.

Example 5: SecOps / IRM

User says: "Create a Vulnerability Response integration that opens exceptions only for approved compensating controls"

Actions: Load references/irm-secops.md, references/security.md, and references/rest-api.md, then return data model, approval logic, and audit requirements.

Example 6: SPM

User says: "Model demand intake and project creation with resource plans"

Actions: Load references/spm.md plus references/app-engine.md or references/flow-designer.md, then return table/process guidance and portfolio governance notes.

Example 7: Vulnerability Response

User says: "Build triage logic for vulnerable items that routes exceptions to security governance"

Actions: Load references/vulnerability-response.md, references/irm-secops.md, and references/integrationhub.md, then return routing logic, exception controls, and audit requirements.

Example 8: Security Incident Response

User says: "Create a security incident workflow for containment and forensic handoff"

Actions: Load references/security-incident-response.md, references/flow-designer.md, and references/security.md, then return lifecycle design, task model, and escalation rules.

Example 9: SAM Pro

User says: "Reconcile software entitlements against installs and flag reclaim candidates"

Actions: Load references/sam-pro.md and references/itam.md, then return normalization assumptions, compliance logic, and reclamation workflow.

Example 10: CSDM / CMDB governance

User says: "Model business applications and services using CSDM and clean up ownership gaps"

Actions: Load references/csdm-cmdb-governance.md and references/advanced.md, then return class mapping, governance steps, and validation queries.

Example 11: IntegrationHub

User says: "Create a custom spoke action that streams paginated records from an external API"

Actions: Load references/integrationhub.md and references/rest-api.md, then return the action contract, credential strategy, pagination handling, and retry notes.

Troubleshooting

Release Notes

Treat release behavior as instance-specific. If a feature depends on family release or plugin state, say so explicitly and ask which release the customer is on.

Recent family names often referenced in examples:

• Zurich
• Xanadu
• Washington DC