- Build & Deploy Power Automate Flows with FlowStudio MCP
- Step-by-step guide for constructing and deploying Power Automate cloud flows
- programmatically through the FlowStudio MCP server.
- Prerequisite
- A FlowStudio MCP server must be reachable with a valid JWT.
See the
flowstudio-power-automate-mcp
skill for connection setup.
Subscribe at
https://mcp.flowstudio.app
Source of Truth
Always call
tools/list
first
to confirm available tool names and their
parameter schemas. Tool names and parameters may change between server versions.
This skill covers response shapes, behavioral notes, and build patterns —
things
tools/list
cannot tell you. If this document disagrees with
tools/list
or a real API response, the API wins.
Python Helper
import
json
,
urllib
.
request
MCP_URL
=
"https://mcp.flowstudio.app/mcp"
MCP_TOKEN
=
"
" def mcp ( tool , ** kwargs ) : payload = json . dumps ( { "jsonrpc" : "2.0" , "id" : 1 , "method" : "tools/call" , "params" : { "name" : tool , "arguments" : kwargs } } ) . encode ( ) req = urllib . request . Request ( MCP_URL , data = payload , headers = { "x-api-key" : MCP_TOKEN , "Content-Type" : "application/json" , "User-Agent" : "FlowStudio-MCP/1.0" } ) try : resp = urllib . request . urlopen ( req , timeout = 120 ) except urllib . error . HTTPError as e : body = e . read ( ) . decode ( "utf-8" , errors = "replace" ) raise RuntimeError ( f"MCP HTTP { e . code } : { body [ : 200] } " ) from e raw = json . loads ( resp . read ( ) ) if "error" in raw : raise RuntimeError ( f"MCP error: { json . dumps ( raw [ 'error' ] ) } " ) return json . loads ( raw [ "result" ] [ "content" ] [ 0 ] [ "text" ] ) ENV = " "
e.g. Default-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Step 1 — Safety Check: Does the Flow Already Exist? Always look before you build to avoid duplicates: results = mcp ( "list_store_flows" , environmentName = ENV , searchTerm = "My New Flow" )
list_store_flows returns a direct array (no wrapper object)
if len ( results )
0 :
Flow exists — modify rather than create
id format is "envId.flowId" — split to get the flow UUID
FLOW_ID
- results
- [
- 0
- ]
- [
- "id"
- ]
- .
- split
- (
- "."
- ,
- 1
- )
- [
- 1
- ]
- (
- f"Existing flow:
- {
- FLOW_ID
- }
- "
- )
- defn
- =
- mcp
- (
- "get_live_flow"
- ,
- environmentName
- =
- ENV
- ,
- flowName
- =
- FLOW_ID
- )
- else
- :
- (
- "Flow not found — building from scratch"
- )
- FLOW_ID
- =
- None
- Step 2 — Obtain Connection References
- Every connector action needs a
- connectionName
- that points to a key in the
- flow's
- connectionReferences
- map. That key links to an authenticated connection
- in the environment.
- MANDATORY
- You MUST call list_live_connections first — do NOT ask the user for connection names or GUIDs. The API returns the exact values you need. Only prompt the user if the API confirms that required connections are missing. 2a — Always call list_live_connections first conns = mcp ( "list_live_connections" , environmentName = ENV )
Filter to connected (authenticated) connections only
active
[ c for c in conns [ "connections" ] if c [ "statuses" ] [ 0 ] [ "status" ] == "Connected" ]
Build a lookup: connectorName → connectionName (id)
conn_map
{ } for c in active : conn_map [ c [ "connectorName" ] ] = c [ "id" ] print ( f"Found { len ( active ) } active connections" ) print ( "Available connectors:" , list ( conn_map . keys ( ) ) ) 2b — Determine which connectors the flow needs Based on the flow you are building, identify which connectors are required. Common connector API names: Connector API name SharePoint shared_sharepointonline Outlook / Office 365 shared_office365 Teams shared_teams Approvals shared_approvals OneDrive for Business shared_onedriveforbusiness Excel Online (Business) shared_excelonlinebusiness Dataverse shared_commondataserviceforapps Microsoft Forms shared_microsoftforms Flows that need NO connections (e.g. Recurrence + Compose + HTTP only) can skip the rest of Step 2 — omit connectionReferences from the deploy call. 2c — If connections are missing, guide the user connectors_needed = [ "shared_sharepointonline" , "shared_office365" ]
adjust per flow
missing
[ c for c in connectors_needed if c not in conn_map ] if not missing : print ( "✅ All required connections are available — proceeding to build" ) else :
── STOP: connections must be created interactively ──
Connections require OAuth consent in a browser — no API can create them.
print ( "⚠️ The following connectors have no active connection in this environment:" ) for c in missing : friendly = c . replace ( "shared_" , "" ) . replace ( "onlinebusiness" , " Online (Business)" ) print ( f" • { friendly } (API name: { c } )" ) print ( ) print ( "Please create the missing connections:" ) print ( " 1. Open https://make.powerautomate.com/connections" ) print ( " 2. Select the correct environment from the top-right picker" ) print ( " 3. Click '+ New connection' for each missing connector listed above" ) print ( " 4. Sign in and authorize when prompted" ) print ( " 5. Tell me when done — I will re-check and continue building" )
DO NOT proceed to Step 3 until the user confirms.
After user confirms, re-run Step 2a to refresh conn_map.
2d — Build the connectionReferences block Only execute this after 2c confirms no missing connectors: connection_references = { } for connector in connectors_needed : connection_references [ connector ] = { "connectionName" : conn_map [ connector ] ,
the GUID from list_live_connections
- "source"
- :
- "Invoker"
- ,
- "id"
- :
- f"/providers/Microsoft.PowerApps/apis/
- {
- connector
- }
- "
- }
- IMPORTANT —
- host.connectionName
- in actions
- When building actions in
Step 3, set
host.connectionName
to the
key
from this map (e.g.
shared_teams
), NOT the connection GUID. The GUID only goes inside the
connectionReferences
entry. The engine matches the action's
host.connectionName
to the key to find the right connection.
Alternative
— if you already have a flow using the same connectors,
you can extract
connectionReferences
from its definition:
ref_flow
=
mcp
(
"get_live_flow"
,
environmentName
=
ENV
,
flowName
=
"
" ) connection_references = ref_flow [ "properties" ] [ "connectionReferences" ] See the power-automate-mcp skill's connection-references.md reference for the full connection reference structure. Step 3 — Build the Flow Definition Construct the definition object. See flow-schema.md for the full schema and these action pattern references for copy-paste templates: action-patterns-core.md — Variables, control flow, expressions action-patterns-data.md — Array transforms, HTTP, parsing action-patterns-connectors.md — SharePoint, Outlook, Teams, Approvals definition = { "$schema" : "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#" , "contentVersion" : "1.0.0.0" , "triggers" : { . . . } ,
see trigger-types.md / build-patterns.md
"actions" : { . . . }
see ACTION-PATTERNS-*.md / build-patterns.md
} See build-patterns.md for complete, ready-to-use flow definitions covering Recurrence+SharePoint+Teams, HTTP triggers, and more. Step 4 — Deploy (Create or Update) update_live_flow handles both creation and updates in a single tool. Create a new flow (no existing flow) Omit flowName — the server generates a new GUID and creates via PUT: result = mcp ( "update_live_flow" , environmentName = ENV ,
flowName omitted → creates a new flow
definition
definition , connectionReferences = connection_references , displayName = "Overdue Invoice Notifications" , description = "Weekly SharePoint → Teams notification flow, built by agent" ) if result . get ( "error" ) is not None : print ( "Create failed:" , result [ "error" ] ) else :
Capture the new flow ID for subsequent steps
FLOW_ID
result [ "created" ] print ( f"✅ Flow created: { FLOW_ID } " ) Update an existing flow Provide flowName to PATCH: result = mcp ( "update_live_flow" , environmentName = ENV , flowName = FLOW_ID , definition = definition , connectionReferences = connection_references , displayName = "My Updated Flow" , description = "Updated by agent on " + import ( 'datetime' ) . datetime . utcnow ( ) . isoformat ( ) ) if result . get ( "error" ) is not None : print ( "Update failed:" , result [ "error" ] ) else : print ( "Update succeeded:" , result ) ⚠️ update_live_flow always returns an error key. null (Python None ) means success — do not treat the presence of the key as failure. ⚠️ description is required for both create and update. Common deployment errors Error message (contains) Cause Fix missing from connectionReferences An action's host.connectionName references a key that doesn't exist in the connectionReferences map Ensure host.connectionName uses the key from connectionReferences (e.g. shared_teams ), not the raw GUID ConnectionAuthorizationFailed / 403 The connection GUID belongs to another user or is not authorized Re-run Step 2a and use a connection owned by the current x-api-key user InvalidTemplate / InvalidDefinition Syntax error in the definition JSON Check runAfter chains, expression syntax, and action type spelling ConnectionNotConfigured A connector action exists but the connection GUID is invalid or expired Re-check list_live_connections for a fresh GUID Step 5 — Verify the Deployment check = mcp ( "get_live_flow" , environmentName = ENV , flowName = FLOW_ID )
Confirm state
print ( "State:" , check [ "properties" ] [ "state" ] )
Should be "Started"
Confirm the action we added is there
acts
- check
- [
- "properties"
- ]
- [
- "definition"
- ]
- [
- "actions"
- ]
- (
- "Actions:"
- ,
- list
- (
- acts
- .
- keys
- (
- )
- )
- )
- Step 6 — Test the Flow
- MANDATORY
- Before triggering any test run, ask the user for confirmation . Running a flow has real side effects — it may send emails, post Teams messages, write to SharePoint, start approvals, or call external APIs. Explain what the flow will do and wait for explicit approval before calling trigger_live_flow or resubmit_live_flow_run . Updated flows (have prior runs) The fastest path — resubmit the most recent run: runs = mcp ( "get_live_flow_runs" , environmentName = ENV , flowName = FLOW_ID , top = 1 ) if runs : result = mcp ( "resubmit_live_flow_run" , environmentName = ENV , flowName = FLOW_ID , runName = runs [ 0 ] [ "name" ] ) print ( result ) Flows already using an HTTP trigger Fire directly with a test payload: schema = mcp ( "get_live_flow_http_schema" , environmentName = ENV , flowName = FLOW_ID ) print ( "Expected body:" , schema . get ( "triggerSchema" ) ) result = mcp ( "trigger_live_flow" , environmentName = ENV , flowName = FLOW_ID , body = { "name" : "Test" , "value" : 1 } ) print ( f"Status: { result [ 'status' ] } " ) Brand-new non-HTTP flows (Recurrence, connector triggers, etc.) A brand-new Recurrence or connector-triggered flow has no runs to resubmit and no HTTP endpoint to call. Deploy with a temporary HTTP trigger first, test the actions, then swap to the production trigger. 7a — Save the real trigger, deploy with a temporary HTTP trigger
Save the production trigger you built in Step 3
production_trigger
definition [ "triggers" ]
Replace with a temporary HTTP trigger
definition [ "triggers" ] = { "manual" : { "type" : "Request" , "kind" : "Http" , "inputs" : { "schema" : { } } } }
Deploy (create or update) with the temp trigger
result
mcp ( "update_live_flow" , environmentName = ENV , flowName = FLOW_ID ,
omit if creating new
definition
definition , connectionReferences = connection_references , displayName = "Overdue Invoice Notifications" , description = "Deployed with temp HTTP trigger for testing" ) if result . get ( "error" ) is not None : print ( "Deploy failed:" , result [ "error" ] ) else : if not FLOW_ID : FLOW_ID = result [ "created" ] print ( f"✅ Deployed with temp HTTP trigger: { FLOW_ID } " ) 7b — Fire the flow and check the result
Trigger the flow
test
mcp ( "trigger_live_flow" , environmentName = ENV , flowName = FLOW_ID ) print ( f"Trigger response status: { test [ 'status' ] } " )
Wait for the run to complete
import time ; time . sleep ( 15 )
Check the run result
runs
mcp ( "get_live_flow_runs" , environmentName = ENV , flowName = FLOW_ID , top = 1 ) run = runs [ 0 ] print ( f"Run { run [ 'name' ] } : { run [ 'status' ] } " ) if run [ "status" ] == "Failed" : err = mcp ( "get_live_flow_run_error" , environmentName = ENV , flowName = FLOW_ID , runName = run [ "name" ] ) root = err [ "failedActions" ] [ - 1 ] print ( f"Root cause: { root [ 'actionName' ] } → { root . get ( 'code' ) } " )
Debug and fix the definition before proceeding
See power-automate-debug skill for full diagnosis workflow
7c — Swap to the production trigger Once the test run succeeds, replace the temporary HTTP trigger with the real one:
Restore the production trigger
- definition
- [
- "triggers"
- ]
- =
- production_trigger
- result
- =
- mcp
- (
- "update_live_flow"
- ,
- environmentName
- =
- ENV
- ,
- flowName
- =
- FLOW_ID
- ,
- definition
- =
- definition
- ,
- connectionReferences
- =
- connection_references
- ,
- description
- =
- "Swapped to production trigger after successful test"
- )
- if
- result
- .
- get
- (
- "error"
- )
- is
- not
- None
- :
- (
- "Trigger swap failed:"
- ,
- result
- [
- "error"
- ]
- )
- else
- :
- (
- "✅ Production trigger deployed — flow is live"
- )
- Why this works
-
- The trigger is just the entry point — the actions are
- identical regardless of how the flow starts. Testing via HTTP trigger
- exercises all the same Compose, SharePoint, Teams, etc. actions.
- Connector triggers
- (e.g. "When an item is created in SharePoint"):
- If actions reference
- triggerBody()
- or
- triggerOutputs()
- , pass a
- representative test payload in
- trigger_live_flow
- 's
- body
- parameter
- that matches the shape the connector trigger would produce.
- Gotchas
- Mistake
- Consequence
- Prevention
- Missing
- connectionReferences
- in deploy
- 400 "Supply connectionReferences"
- Always call
- list_live_connections
- first
- "operationOptions"
- missing on Foreach
- Parallel execution, race conditions on writes
- Always add
- "Sequential"
- union(old_data, new_data)
- Old values override new (first-wins)
- Use
- union(new_data, old_data)
- split()
- on potentially-null string
- InvalidTemplate
- crash
- Wrap with
- coalesce(field, '')
- Checking
- result["error"]
- exists
- Always present; true error is
- != null
- Use
- result.get("error") is not None
- Flow deployed but state is "Stopped"
- Flow won't run on schedule
- Check connection auth; re-enable
- Teams "Chat with Flow bot" recipient as object
- 400
- GraphUserDetailNotFound
- Use plain string with trailing semicolon (see below)
- Teams
- PostMessageToConversation
- — Recipient Formats
- The
- body/recipient
- parameter format depends on the
- location
- value:
- Location
- body/recipient
- format
- Example
- Chat with Flow bot
- Plain email string with
- trailing semicolon
- "user@contoso.com;"
- Channel
- Object with
- groupId
- and
- channelId
- {"groupId": "...", "channelId": "..."}
- Common mistake
- passing {"to": "user@contoso.com"} for "Chat with Flow bot" returns a 400 GraphUserDetailNotFound error. The API expects a plain string. Reference Files flow-schema.md — Full flow definition JSON schema trigger-types.md — Trigger type templates action-patterns-core.md — Variables, control flow, expressions action-patterns-data.md — Array transforms, HTTP, parsing action-patterns-connectors.md — SharePoint, Outlook, Teams, Approvals build-patterns.md — Complete flow definition templates (Recurrence+SP+Teams, HTTP trigger)