| name | build-workflow |
| description | Build or modify Tray workflows. Use this skill whenever the user asks to create, build, or modify a workflow — including requests like "build a workflow that...", "create a workflow to...", "set up an integration between...", "automate X", or "modify the workflow that...".
Examples of when this skill MUST be loaded:
- "Build a workflow that syncs Salesforce leads to Slack"
- "Create a scheduled job that sends a daily email report"
- "Set up an integration between HubSpot and Google Sheets"
- "Modify the existing lead scoring workflow to add error handling"
- "I have a Workato recipe — can you recreate it in Tray?"
This skill is the entry point for ALL workflow creation and modification. Load it BEFORE making any create_workflow, add_workflow_steps, or update_workflow_steps calls.
|
Build Tray Workflow
Follow this process for every workflow build or modification. Do not skip the plan step.
Core principles
- Discover technically, clarify strategically. Use MCP tools to answer technical questions without asking. Surface design questions before committing to an approach.
- Understand before building. Check the existing workspace, ask 2-3 clarifying questions about intent, scope, or tradeoffs.
- Batch questions. Ask everything in one message.
- Never guess field values. When DDL can't reveal values, always ask the user explicitly.
- Salesforce custom fields (
*__c) require explicit handling. Their valid values are org-specific and unknown to the connector schema. Before setting any value on a *__c field, either DDL its picklist, ask the user, or — if the user already supplied the value — still call out the assumption in the build summary ("Built with Priority__c = 'High' — assumes that's a valid picklist value in your org"). Building silently is a fail. See tray-gotchas for the rule.
- Build in Tray, not local files. The source of truth is always in the Tray workspace via MCP tools — never edit local JSON directly.
- Never build workflows in parallel. Dependencies (callable workflows) must be created first.
- Chain version_ids. Every mutating tool returns a new
version_id that must be used for the next operation.
- Default to delegating connector research to the Researcher subagent. Spawn an agent matching the description "Research a Tray connector — discover version, operations, auth, required fields, DDL values, and return a step-level prescriptive result". You hand it an intent (connector + operation + the user's data flow) and it hands back a typed
properties block ready to drop into update_workflow. The parent agent should not call list_connector_operations itself — operation schemas are absorbed by the Researcher, the parent just reads back a step-input ready to use. Calling list_connector_operations directly is a fallback for trivial lookups (single connector, single small operation, no DDL fields), not the default path.
- Track progress through multi-step builds (use your plan/todo facility) so dependent steps run in the right order.
Related skills
research-connector — manual connector research (when not using the agent)tray-connectors — quick lookup for core connector versions and property typestray-patterns — workflow structure reference, trigger properties, branch/loop patternstray-gotchas — error debugging and edge cases
get_workflow defaults to view: "structure" — a cheap structure tree + per-step index without properties. Use view: "step" (with step_names) to drill into specific steps' full properties. Reach for view: "full" only when you genuinely need the entire JSON (rare); don't dump that into the conversation when summarising — point the user at the Tray UI to inspect.
Step 1: Plan (mandatory — before any API calls)
For new workflows:
1a. Understand the request:
- Identify ambiguities, implicit assumptions, or unstated edge cases
- Check existing project/workspace with
list_projects for related workflows
- Surface design questions: scope (one workflow or several?), trigger choice tradeoffs, error handling needs, edge cases (no results, duplicates, failures)
1b. Produce a structured plan and present it to the user:
WORKFLOW PLAN
─────────────
Project: [name]
Workflow: [name]
Trigger: [type] ([connector] v[version], [operation])
Config: [schedule, webhook URL, etc.]
Steps:
1. [connector]-1: [operation] — [purpose]
2. [connector]-2: [operation] — [purpose]
...
Branching:
- [step]: [condition] → true: [steps], false: [steps]
Error Handling:
- [step]: manual error handling → error: [action], success: [continue]
Auth Required:
- [connector]: [existing auth name / needs new auth]
Callable Dependencies:
- [workflow A] must be created before [workflow B]
1c. Wait for user approval before proceeding.
For modifications to existing workflows:
- Fetch current state with
get_workflow(workflow_id)
- Show the user what exists and what will change
- Get approval before making changes
Step 2: Research Connectors
For each connector in the approved plan — including the trigger connector — delegate research to the Researcher subagent. The trigger is a connector like any other: it has an inputSchema with required fields, possibly DDL lookup values (e.g. timezones), and the Researcher will return a step-level prescriptive result for it just like any operational step. Do not skip trigger research or rely on memorized defaults.
Trigger choice is decided at plan time, not research time. Map the user's wording to the right trigger connector before you spawn the Researcher — see tray-connectors#picking-the-trigger-from-the-users-prompt. Common miss: prompts that mention "form" / "submit" / "form fields" must use form-trigger, not webhook. The two have different downstream output shapes — picking webhook for a form-shaped prompt builds a workflow that can't read the form's typed fields. Webhook is for incoming HTTP from external systems (Stripe, Zendesk, etc.), not for form submissions.
If list_connectors(connector_names: [...]) reports "N/M found" and the missing names include form-trigger, callable-trigger, agent-tool-trigger, or any other trigger-only connector, that's a quirk of the REST endpoint — those exist but only show up under list_connectors(is_trigger: true). Re-query with is_trigger: true (or with connector_names AND is_trigger: true) before assuming the trigger isn't available.
Default path: delegate to the Tray Researcher subagent. This repo ships a tray-researcher subagent (agents/tray-researcher.toml); spawn it (e.g. "spawn the tray-researcher agent to research …", or via /agent) and hand it the research intent. If subagents aren't available in your Codex version, run the research inline by following the research-connector skill — but keep the verbose schema work in a tight loop and only carry the prescriptive result forward.
Spawn: tray-researcher
prompt: "Research [connector] for [operation].
Auth to check: [name or service]. Fields needed: [list from plan].
Workflow context: [trigger output shape, upstream step outputs]."
The Researcher will return a typed properties block per operation, ready to drop into update_workflow. Pass the returned block straight through — you do not need to read the operation's inputSchema yourself. For multiple independent connectors, spawn the Researcher in parallel — each subagent runs on its own MCP queue, returns a concise prescriptive summary, and keeps the verbose DDL isolated in its own context. Only spawn sequentially when one Researcher's output genuinely feeds the next (rare).
Fallback: call list_connector_operations directly only when the operation is trivial (no DDL fields, no polymorphism, no auth setup) AND you're confident the round-trip cost beats spawning a subagent. The tool returns compacted schemas by default — advanced fields stripped, polymorphic structures (oneOf, deeply-nested array items, large enums) replaced with _collapsed markers carrying expand: ['<propName>'] hints. If you do call it directly: read the markers, decide which branches to expand, and re-call with the named property in the expand array. Pass include_advanced: true only when an advanced field is actually required, and include_output_schema: false for terminal steps with no downstream jsonpath consumers.
Existing-auth lookups: filter list_authentications by service_name, not by keyword search. Auth display names are user-supplied and unreliable — an auth labelled "Sheets" that backs google-sheets will not match search: "google", and project-scoped ai-agent auths often outrank the real service auth in keyword matches. Pass service_name: "<service>" (e.g. "google-sheets", "slack", "salesforce") — the slug is the same one returned in connector.service.name from list_connectors. The Researcher applies this rule by default; direct lookups from the parent agent should too. If a service-name filter returns 0 rows, fall back to an unfiltered list_authentications and inspect the service block on each row before keyword search.
Research checklist (per connector, including trigger):
CRITICAL: Step properties MUST use exact field names from inputSchema. The MCP server validates properties against the connector schema — made-up field names will be rejected.
Referencing Step Output (JsonPath)
When a step needs to reference output from a previous step, build the jsonpath from the actual output schema of the step being referenced. Different step types have different output shapes — do not assume a universal pattern.
$.steps.<step-name>.<path-based-on-step-output-schema>
How to determine the correct path: Look at the output returned by the step (from a test call_connector call, or from the operation's outputSchema). The jsonpath must match the runtime output structure of that specific step.
Special path patterns:
$.steps.loop-1.value.<field> — current loop iteration item
$.steps.call-workflow-1.response.<field> — callable workflow response
$.env.<variable> — environment variable
Note: The call_connector tool response may wrap data differently than the workflow runtime. Always verify the runtime output shape — don't assume the call_connector response structure is identical to the runtime jsonpath structure.
Property Value Wrapping
ALL property values must be wrapped in Tray's type format. Never pass raw values.
WRONG: "hour": "9"
CORRECT: "hour": {"type": "string", "value": "9"}
WRONG: "limit": 100
CORRECT: "limit": {"type": "integer", "value": 100}
WRONG: "active": true
CORRECT: "active": {"type": "boolean", "value": true}
When referencing another step's output:
"channel": {"type": "jsonpath", "value": "$.steps.script-1.channel_id"}
The inputSchema from list_connector_operations shows field types (string, integer, etc.) — these map to the type field in the wrapper, NOT to raw values. The MCP server's validateStepProperties enforces this format on every mutating call.
Object array items must be wrapped too
When a property's inputSchema is array with items.type: "object" (or items.oneOf: [...]), each item must itself be wrapped as {"type": "object", "value": {...}}. The Tray API will silently accept a bare object — the workflow will save fine — but the workflow editor cannot read the inner properties and the step will fail at runtime with "field is required" / "value is required" UI errors. The MCP server's validateStepProperties rejects this on every mutation; if you see Array item must be type-wrapped in a tool result, this is the rule.
WRONG:
"conditions": {
"type": "array",
"value": [
{ "field": {"type":"string","value":"Industry"},
"operator": {"type":"string","value":"Equal to"},
"value": {"type":"string","value":"Technology"} }
]
}
CORRECT:
"conditions": {
"type": "array",
"value": [
{ "type": "object",
"value": {
"field": {"type":"string","value":"Industry"},
"operator": {"type":"string","value":"Equal to"},
"value": {"type":"string","value":"Technology"}
} }
]
}
Common offenders: salesforce.find_records.conditions, salesforce.update_record.fields (each item needs key + value wrapped), agent-tool-trigger input schemas with array fields, sheet/airtable column-mapping arrays. Primitive arrays (items.type: "string"|"integer"|...) just need each item type-wrapped as the primitive — salesforce.find_records.fields items are {"type":"string","value":"Id"}, not nested-object-wrapped.
Step 3: Build
3a. Analyze dependencies
Identify callable workflows and their dependency chain. Create in order: callable workflows first, callers last. Store each workflow_id for reference.
Callable workflow rule: If a callable workflow uses the trigger_and_respond operation (synchronous), it MUST include a callable-workflow-response step — without it, the calling workflow will hang. If it uses the trigger operation (async/fire-and-forget), it must NOT have a response step.
Trigger event reply rule: Workflows using webhook (webhook_with_response), API operation triggers (request_response / publish_subscribe), or agent tool triggers (request_response) need a trigger-reply step to return a response. The reply step's properties shape is declared by the trigger op's replySchema — read it from list_connector_operations. The shape splits by trigger family: webhook + publish_subscribe are flat (no envelope); APIM request_response and agent-tool-trigger request_response use a {response: {<discriminator>: {...}}} envelope with a oneOf of variants (successBody, errorBody, internalErrorBody, invalidInputBody, forbiddenBody). For the callable-trigger pairing, the response shape lives on callable-workflow-response.response.inputSchema instead. See tray-gotchas "Trigger Event Reply Steps" for the per-family rules + worked examples.
3b. Create project
create_project(name="[from plan]", description="[brief]")
→ Returns: project_id
3c. Create workflow with trigger
Use the trigger connector's researched inputSchema to set properties. Include ALL required fields from the schema — the trigger is configured here, not via add_workflow_steps.
description is required for every workflow. It serves two audiences:
- For most workflows, it provides UI context for humans maintaining the workflow.
- For
agent-tool-trigger workflows, the description becomes the tool description an agent reads when deciding whether to invoke the tool. Write it from the agent's perspective: what the tool does, when to use it, what inputs it expects. A weak description means the agent won't know when to call it. The MCP server enforces a minimum description length for these workflows.
For agent-tool-trigger workflows, create_workflow also auto-registers an API operation under the project's API Management so the workflow is immediately callable as a tool — no manual UI step needed. The operation name is derived from the workflow name (lowercased, non-alphanumerics replaced with _); the path is /ai-agent/{name}. If the registration fails (e.g., name collision), the workflow is kept and a warning is returned — no automatic rollback.
For triggers with DynamicSchema-tagged fields (APIM's request.body / request.headers / response.<variant>, agent-tool-trigger's body.tool_input / body.static_data): the field's .value is raw JSON Schema, not type-wrapped (see tray-gotchas "DynamicSchema content" for the right vs. wrong shape). Inside that schema, include title and description on every property — Tray's UI renders them as the "Name" and "Description" fields next to each property key, and a blank Name reads as a half-built tool to anyone editing the trigger later.
create_workflow(project_id, workflow_name, description, trigger={
connector_name: "[from research]",
connector_version: "[from research]",
operation: "[from research]",
title: "[descriptive title]",
properties: {
// ALL required fields from the trigger operation's inputSchema
// ALL values type-wrapped: {"type": "string", "value": "..."}
}
})
→ Returns: workflow_id + version_id
To update metadata later (description, name, enabled, tags) use update_workflow_metadata(workflow_id, ...). This is the only API path that can change a workflow's description — the versioned PUT endpoint silently ignores description edits. It does not bump the version_id, so it's safe to call mid-build without disrupting the step-editing chain.
3d. Add the planned steps
Use add_workflow_steps for every step add — pass a one-element array if you only need a single step. After research you almost always know every step you need for a workflow upfront; emit them in one batched call instead of paying N separate LLM round-trips. The MCP server validates every step's properties before any HTTP call; if any step's properties are malformed the whole batch is rejected with errors aggregated by step name, and you retry with a fixed batch.
add_workflow_steps(workflow_id, version_id, steps=[
{step_name: "salesforce-1", connector_name: "salesforce", connector_version: "8.8",
operation: "find_records", title: "Find Leads",
properties: { ... }, auth_id: "<uuid>"},
{step_name: "script-1", connector_name: "script", connector_version: "3.4",
operation: "execute", properties: { ... }},
{step_name: "slack-1", connector_name: "slack", connector_version: "11.0",
operation: "send_message", properties: { ... }, auth_id: "<uuid>"}
])
→ Returns: new version_id + full step list
If a workflow has more than ~15 steps, split into 2 batched calls to stay safely under the model's output budget. If you genuinely need to inspect intermediate state between additions (e.g. fetching DDL to decide step N+1), call add_workflow_steps with the steps you have so far, then call it again with the next batch — the version_id chains the same way.
3e. Configure step properties (if not set during add) — or fix N steps from one round of validator errors
Use update_workflow_steps with an array of {step_name, properties, operation?, auth_id?, error_handling?} entries. Pass one entry for a single update; pass many to fix several steps in one round-trip. The properties object on each entry is the FULL replacement (not a merge/patch).
update_workflow_steps can also swap the operation on an existing step — useful when modifying a workflow in place rather than removing and re-adding. Set operation to the new op name on the same connector and the new properties are validated against the new operation's schema before the call goes out. Connector + version cannot change — remove and re-add the step to switch connectors. When an operation is swapped, the cached output_schema is dropped so any downstream jsonpath references are re-resolved against the new operation's outputs.
update_workflow_steps(workflow_id, version_id, steps=[
{step_name: "salesforce-1",
properties: { ... }, // FULL properties object — replaces, not merges
auth_id: "<uuid>"}, // pass the `id` field from list_authentications, NOT `group`
{step_name: "text-helpers-1",
operation: "concatenate", // swap to a different operation on the same connector; properties validated against the new op
properties: { values: { ... }, separator: { ... } }},
{step_name: "slack-1",
properties: { ... },
error_handling: "manual"} // step becomes branch with empty error/success paths
])
→ Returns: new version_id + the list of updated step names + any operation changes
3f. Reorganize structure (move steps into branches, reorder)
get_workflow(workflow_id) // default view: "structure" — returns the tree + step index
update_workflow_structure(workflow_id, version_id, structure=[...])
→ Returns: new version_id
Step 4: Validate
Structural audit is automatic. Every mutating workflow tool (create_workflow, add_workflow_steps, update_workflow_steps, remove_workflow_step, update_workflow_structure, update_workflow_metadata, import_workflow) runs validate_workflow server-side and returns any findings in the same tool response. You don't need to invoke it manually in the common case — if there are structural issues, they'll arrive alongside the tool result and you should fix them before handing off to the user.
When validator errors flag multiple steps at once, fix them in one batched call to update_workflow_steps rather than N sequential singular updates — same atomic per-step validation as the add path, single version mint, single round-trip.
Call validate_workflow(workflow_id) explicitly when you want an on-demand audit — for example, after multiple rapid mutations, or at the end of a long build to confirm clean state.
The validator checks:
- Every
{type:"jsonpath", value:"$.steps.<name>..."} resolves — step exists AND the path matches the referenced step's effective output schema. Shape rules: script wraps in result, loop in value, call-workflow in response, raw_http_request depends on parse_response. Trigger envelopes (webhook → body, form-trigger → result, callable-trigger → data, agent-tool-trigger → tool_input / static_data) are documented in tray-patterns and tray-connectors
- Structural rules — no
next pointers; loop uses _loop wrapper; branch has path keys; trigger step named trigger; scheduled-daily has all 7 day_of_week keys; trigger_and_respond callable has a callable-workflow-response step while async trigger callables do not; oneOf array items are type-wrapped
- Step naming follows
<connector>-N
Plan-vs-build comparison (does this workflow match what we agreed on?) stays in the main conversation — walk the plan's steps against get_workflow output. That's judgement, not a deterministic rule.
Step 5: Test (only with explicit permission)
trigger_workflow fires a workflow against the live Tray workspace — not a dry-run, not a sandbox. Each fire executes every step, creates an execution log entry, consumes API quota, and runs every connector against whatever real systems it's wired to (Slack messages get posted, Salesforce records get written, third-party webhooks get called).
Always ask permission explicitly before firing. Be clear about what will happen:
- "I'll fire the workflow against your live Tray workspace — this creates an execution log entry and consumes API quota."
- For workflows whose downstream steps touch external systems: "This will also send a real Slack message / create a real Salesforce record / call . Should I proceed?"
WRONG — vague:
"Ready to test?"
"I'll proceed with testing now."
RIGHT — explicit:
"Ready to fire the workflow in your Tray workspace? This will create execution logs and consume API resources, and the Slack step will post to #demo-channel."
After the user confirms, trigger_workflow returns a workflow_instance and the literal fired_payload_shape. Verify your jsonpaths against fired_payload_shape, then call get_workflow_execution(workflow_id, workflow_instance) to inspect the run. For failed steps, get_workflow_step_detail drills into input/output. See tray-gotchas Runtime Debug Flow for the full loop.
MCP Tool Reference
These tools come from the tray MCP server (configured in ~/.codex/config.toml). Codex exposes them namespaced to that server — the exact surface form depends on your Codex version (commonly tray.<tool> or tray__<tool>); the bare tool names below are what matters.
Tool Usage Notes
- Version ID chaining: Every mutating tool returns a
version_id. The next operation MUST use that version_id. Stale version IDs cause API errors (which include the latest version ID for recovery)
- Incremental building:
create_workflow → add_workflow_steps → update_workflow_steps (per-step refinement) → update_workflow_structure (reorganise) → ...
add_workflow_steps / update_workflow_steps: The canonical step-mutating tools. One round-trip each, atomic per-step validation, errors aggregated by step name. Pass a single-element array for a one-step change — there are no singular variants.- SetStepData replaces entire properties:
update_workflow_steps replaces the full properties object on each targeted step — not a merge/patch. Always send the complete property set per step.
- auth_id on steps: Both step-mutating tools accept optional
auth_id per step entry for metadata.auth_uuid
- error_handling on steps: Set to
"manual" to enable manual error handling — changes step type from "normal" to "branch" with empty success/error paths. Follow up with update_workflow_structure to place steps in those paths
- update_workflow_structure: Move steps into branch paths (error/success/true/false), reorder steps, restructure layout. Call
get_workflow first (default view: "structure") to see current structure
- Store workflow IDs during creation for referencing in dependent workflows
Connector Research Tools
list_connectors — Search connectors. Use connector_names array for exact lookup (keyword search can be unreliable). Set is_trigger: true for trigger connectorslist_connector_operations — Get operations with input/output schemascall_connector — Execute operations including DDL for field discoverylist_service_environments — Get auth environments. Requires service_name (string, e.g., "google-gmail") and service_version (integer from list_connectors → service.version) — NOT service_idlist_authentications — List existing auths. Always check before creating new authscreate_auth_collection — Create auth requests. Requires service (UUID from list_service_environments) and service_environment_id — NOT connector_name/connector_versioncheck_auth_completion — Check auth completion status
Failure Recovery
| Problem | Action |
|---|
| Missing authentication | Set up via list_service_environments → create_auth_collection (see research-connector for parameter mapping), test, retry |
| Unclear field values | Ask user — never guess |
| DDL discovery incomplete | Run all relevant DDL operations before proceeding |
| Stale version_id error | Use the latest version_id from the error response and retry |
| Step add/update fails | Use get_workflow to inspect current state, fix, retry |
| Property validation error | Check field names against list_connector_operations inputSchema |
