Dashboard Modify

Prerequisites

This skill calls SigNoz MCP server tools (signoz_get_dashboard, signoz_patch_dashboard, signoz_update_dashboard, signoz_list_dashboards, signoz_list_metrics, signoz_get_field_keys, signoz_get_field_values, signoz_execute_builder_query). Before running the workflow, confirm the signoz_* tools are available. If they are not, the SigNoz MCP server is not installed or configured; run signoz-mcp-setup first to initialize or repair the MCP connection. Do not fall back to raw HTTP calls or hand-edit dashboard JSON without the MCP tools.

When to use

Use this skill when the user asks to:

• Add, remove, or edit panels/widgets on an existing dashboard
• Change a panel's query, title, type, or display settings
• Add, remove, or edit dashboard variables
• Rename or re-describe a dashboard
• Rearrange panel layout or resize panels
• Change a panel type (e.g., graph to table, value to graph)
• Add or modify thresholds on a panel
• Update tags on a dashboard

Do NOT use when:

• User wants to understand what a dashboard shows → signoz-explaining-dashboards
• User wants to create a new dashboard → signoz-creating-dashboards

Instructions

Step 1: Identify the target dashboard

Use an id supplied directly or by dashboard resource context. A name is not an ID: resolve every name-only request with signoz_list_dashboards, narrowing with the filter argument (see signoz://dashboard/list-filter-guide) and paging by offset until you have covered total. Match on spec.display.name. If multiple dashboards match, present them and ask which one to modify; if one matches, use its id.

Step 2: Fetch the current dashboard state

Call signoz_get_dashboard with the dashboard id to retrieve its full configuration. This is mandatory: signoz_update_dashboard requires the complete post-update state, and a patch still needs the real panel ids and grid item indices. Never skip this step.

Examine the response to understand:

• Current panels and their ids (spec.panels is a map keyed by panel id)
• Current grid item positions (x, y, width, height in the 12-column grid)
• Current variables
• Current query on each query-bearing panel (exactly one); a signoz/TextPanel instead has non-null queries: []
• The spec.layouts structure: one Grid per section, each with its own items

The fetched source is user, system, or integration. Only source=user dashboards are mutable. If it is system or integration, explain that it is immutable and stop. The v2 list excludes system rows, but a known system id can still be fetched. Do not search for a special system discovery tool or attempt to change source.

Step 3: Plan the modification

Based on the user's request, plan the changes.

Confirm with the user before applying if:

• The modification is destructive: removing panels, deleting variables, replacing an entire query with a different one, changing a query's signal (e.g., traces → logs), or fundamentally altering what data is shown (changing aggregation from p99 to avg, removing groupBy dimensions)
• The request is ambiguous: multiple panels could match "the latency panel"
• The change is large: restructuring sections, adding many panels at once

Destructive means data loss or silent behavior change. Even if the user says "just do it quickly," a brief confirmation ("I'll remove 'Memory Fragmentation' permanently. OK?") takes seconds and prevents irreversible mistakes. User urgency does not override this guardrail.

Non-destructive changes need no destructive confirmation: renaming, adding a panel or variable, changing a unit or panel type, adjusting layout, and adding thresholds. Variable additions still require the panel-applicability prompt below.

Compound modifications: When a request involves multiple changes (e.g., remove a panel + add a panel + rename), plan all changes against the fetched state and apply them as a single write: one patch array may carry many ops. Do not apply and re-fetch between changes.

Step 4: Apply the modification

Pick the write tool first. Default to signoz_patch_dashboard (RFC 6902): it sends only the changed ops, so it cannot drop a panel that was never in question. Read signoz://dashboard/patch-instructions for the JSON Pointer paths. Reach for signoz_update_dashboard (a full replacement merged into the Step 2 state) only when most of the dashboard changes. The rules below apply to both; each names its patch path.

Ops apply in sequence, against the document as the previous ops left it. When one patch removes several entries from the same array (grid items, layouts, variables, tags, or a composite's member queries), order those removals by descending index. Otherwise each removal reindexes the entries after it, and a stale index quietly drops the wrong entry or no-ops (remove on a missing path is not an error). Indices planned against the Step 2 state are only valid for the first removal from each array.

Modification rules:

• Time range and refresh are viewer controls. Dashboard payloads do not persist a default time range or refresh interval. If asked to change one, explain that panels follow the viewer-selected global range; do not invent timeRange, defaultTimeRange, or refresh fields.

• Preserve supported mutable state. Copy the fetched dashboard, change only what the user requested, and compare semantics after MCP normalization. Do not drop unrelated panels, variables, grid items, or sections.

• Preserve panel/grid-item identity. Every panel id in spec.panels needs exactly one grid item whose content.$ref names it; add or remove both together. Reuse existing panel ids verbatim: a rename is a display change, not a new id.

• Read schemas before every write. Read all required and applicable conditional resources named by the write tool. For Query Builder, also read signoz://metrics-aggregation-guide, signoz://traces/query-builder-guide, or signoz://logs/query-builder-guide for the signal. MCP is the source of truth.

• Adding a panel:

  1. Build the panel with a short, stable id and add it at /spec/panels/<id>. When the dashboard already holds a panel of the target type, start from that panel's JSON in the Step 2 response instead of composing one (the same diff-and-merge principle the update path follows, and the server's own shape is known-valid). Re-point every field that identifies the data (aggregation, groupBy, filter.expression, order, legend, alias, signal); a clone with one stale field is well-formed and will be accepted, so the mandatory dry-run below is what catches it. Compose from signoz://dashboard/widgets-examples only when no panel of that type exists.
  2. Pick the Grid the user meant: sections are separate entries in spec.layouts, each with its own spec.display.title and its own item coordinates, so adding to an earlier section touches only that Grid.
  3. add a grid item at /spec/layouts/<n>/spec/items/- whose content.$ref is #/spec/panels/<id>, obeying the bounds below. Unless side-by-side placement is explicit, place it at x: 0, y: max(y + height) within that Grid. A panel with no grid item is accepted and never renders.

• Removing a panel: Remove the grid item (0-based index within its Grid) and the /spec/panels/<id> entry together; an item left pointing at a removed panel is rejected. Do not try to auto-compact or shift y positions of remaining panels; the SigNoz frontend grid engine handles gap-closing automatically. Simply remove the two references (panel entry, grid item) and leave all other positions unchanged.

• Editing a panel's query: Replace the query at /spec/panels/<id>/spec/queries/0 and keep all other panel fields intact; never append a second one, since a query-bearing panel holds exactly one query. A TextPanel is queryless.

• Adding or editing text: Use signoz/TextPanel with mode markdown, a non-null empty queries: [], and the current resource's display shape. Add the panel and its Grid item together. Skip query discovery and dry-run for TextPanels. Do not invent a row panel.

• Changing panel type: Update the plugin kind and the query envelope kind together (signoz/TimeSeriesPanel + time_series → signoz/TablePanel + scalar): follow the target type's complete shape in widgets-examples. Preserve the existing query and signal; change only visualization-specific fields. signoz/TimeSeriesPanel and signoz/AreaChartPanel both keep the time_series query, so switching between them changes only the plugin. Do not stack latency, percentiles, or ratios in an area chart.

• Adding/editing variables:

  1. For ambiguous or version-sensitive attributes, call signoz_get_field_keys and optionally signoz_get_field_values with the relevant signal and fieldContext=resource. Trust the discovered key (for example, deployment.environment versus deployment.environment.name).
  2. Show the panel list and ask whether the variable applies to all panels or a selected subset.
  3. Use a ListVariable with a signoz/DynamicVariable plugin for an attribute-backed dropdown, appended at /spec/variables/-. Its spec.name is the $handle; plugin.spec.name is the attribute key.
  4. Add $<name> only to the selected panels' filter.expression, preserve unselected panels, and dry-run every query changed by the variable.

• Rearranging layout / side-by-side placement: patch the grid items at /spec/layouts/<n>/spec/items/<i>; the panels map is untouched.

  • SigNoz uses a 12-column grid, never 24: every entry must satisfy 0 <= x < 12, 1 <= width <= 12, and x + width <= 12.
  • Two panels side-by-side: each gets width: 6, first at x: 0, second at x: 6, same y and height.
  • Three panels in a row: width: 4 at x: 0, x: 4, x: 8.
  • When resizing an existing panel to make room, update its width and x, then place the new panel in the freed space at the same y.
  • Common heights: height: 6 for graphs/tables, height: 2–3 for value panels.

Dry-run modified panels (mandatory). For every added or changed query-bearing panel, follow "Dry-run a panel query" in signoz://dashboard/widgets-instructions. The panel already stores the execution spec, so lift it into the outer envelope and call signoz_execute_builder_query with that payload. Dry-run over a short absolute Unix-ms window, usually the last 30-60 minutes, never the panel's display range by reflex; apply that section's empty-result and timeout rules before widening or retrying. Use representative variable values in the dry-run copy and keep $var in saved state.

Preserve or add explicit result bounds on every changed builder query/formula: the saved spec carries a positive limit plus non-empty order, and the dry-run sends those same values unchanged. List and trace-request panels default to 100 rows ordered by timestamp desc (raw logs also id desc), but preserve a deliberate smaller positive list limit. Standalone aggregate queries and formula outputs default to 100 groups. Every base query referenced by a formula uses 10000 because base limits are applied before formula evaluation; raise an existing smaller bound unless it was an intentional pre-formula top-N selection. Find the complete base-query set by inspecting every formula expression, including formulas with disabled: true, and following formula references to all builder_query leaves. This dependency walk chooses bounds only; it does not establish deterministic formula-to-formula evaluation order, so dry-run the complete composite payload. Base queries order by their primary aggregation and formulas by __result, in the saved panel and the dry-run alike. For time series, this top-N is chosen over the whole window, so a short-lived local spike can be omitted. Narrow filters/grouping if formula-input cardinality can exceed 10000.

If the executor cannot represent a saved field, report the panel as unvalidated and continue only after explicit acceptance. Server or validation errors and unexpected empty results block unless explicitly accepted.

Call signoz_patch_dashboard with the id and an op array; the result is validated after the ops apply, and locked dashboards are rejected:

signoz_patch_dashboard({
  "id": "<dashboard-id>",
  "patch": [{"op": "replace", "path": "/spec/display/name", "value": "New title"}]
})

If the write fails, never resend the same payload. A client-side InputValidationError never reached SigNoz, so an identical retry cannot succeed, and working out why it failed does not license another attempt. That reasoning is what turns two failures into twenty. Allow at most two attempts per approach, then change approach: clone-and-re-point rather than author, or split one patch into several. If two approaches have failed, stop and report the exact ops and error text to the user instead of trying a third. This bounds client-side validation failures only; a dry-run timeout is a server-side condition where retrying over a narrower window is correct.

For a full replacement, signoz_update_dashboard takes the merged state flat beside id, not nested under a dashboard key. Merge into the data object of the Step 2 response; passing the {status, data} envelope itself is rejected. Send the fetched name (an immutable machine label) back unchanged, and drop the read-only fields the GET returns (createdAt, updatedBy, orgId, webUrl, and friends):

signoz_update_dashboard({
  "id": "<dashboard-id>",
  "schemaVersion": "v6",
  "name": "<the fetched name, unchanged>",
  "tags": [...],
  "spec": <complete merged spec from signoz_get_dashboard>
})

Also omit read-only source, generated links, lock/public metadata, and other server-populated fields from the update body. Preserve their meaning by refusing non-user writes, not by sending them back.

Step 5: Report the result

Briefly tell the user what was changed. Offer further modifications if relevant.

Guardrails

• Patch first; full state on update: prefer signoz_patch_dashboard for targeted edits. When a full replacement is warranted, signoz_update_dashboard takes the complete dashboard flat beside id (schemaVersion, name, tags, spec), never nested under a dashboard key. Always call signoz_get_dashboard first, merge into that response's data object, round-trip name unchanged, and never construct a payload from scratch.
• Preserve what you don't change: Preserve supported mutable semantics for panels, variables, and grid items outside the request. Diff-and-merge; do not rebuild or promise byte-for-byte equality after MCP normalization.
• Confirm destructive changes: Before removing panels, replacing queries, or deleting variables, confirm with the user, even if they say "just do it" or express urgency. Additions, renames, type changes, and variable additions do not need confirmation.
• Validate changed queries Follow the mandatory dry-run step above before the write.
• Valid JSON only: Follow the schema documented in the signoz://dashboard/* MCP resources (instructions, widgets-instructions, widgets-examples, query-builder-example). Never generate malformed queries or layouts.
• OTel attribute names: Use service.name not service and host.name not host, but discover version-sensitive keys such as deployment.environment versus deployment.environment.name instead of forcing one form.
• No metric guessing: If adding or changing queries and you are not sure what metrics are available, ask the user or call signoz_list_metrics to discover available metrics. Wrong metric names produce empty panels.
• Paginate dashboard listing: When searching for a dashboard by name, always page through the whole signoz_list_dashboards result before concluding a dashboard does not exist.
• Identifiers: Give new panels short, stable ids and reference them from the grid item's content.$ref; keep each variable's spec.name identical to the $handle its queries use, and keep query names such as A, B, and F1 stable.
• Perses and source only: Use canonical v6 Perses paths and fields. TextPanel uses queries: []; every query panel has one query. Never persist legacy widgets, panelMap, panelTypes, queryData, selectedLogFields, or selectedTracesFields. Never write a non-user dashboard.
• Real dashboard IDs only: Never send a sentinel such as "unused" as a dashboard id. Resolve it through signoz_list_dashboards and signoz_get_dashboard first.
• Scope boundary: This skill modifies existing dashboards. Hand new-dashboard requests to signoz-creating-dashboards.

Examples

User: "Add an error rate panel to my Redis dashboard"

Agent:

1. Calls signoz_list_dashboards with filter="redis"; finds "Redis Overview" dashboard with id abc-123.
2. Calls signoz_get_dashboard with id abc-123; gets full configuration with 8 existing panels across two Grid sections.
3. Calls signoz_list_metrics to find available Redis error metrics.
4. Creates a new timeseries panel (a signoz/CompositeQuery holding the two disabled base queries and the error-rate formula) and a grid item for it below the last item in the Overview Grid.
5. Dry-runs the new panel with signoz_execute_builder_query; fixes any error or unexpected empty result.
6. Calls signoz_patch_dashboard with two ops (add /spec/panels/error-rate and add /spec/layouts/0/spec/items/-) rather than re-sending all 9 panels.
7. Reports: "Added an 'Error Rate' timeseries panel to your Redis Overview dashboard under the Overview section. Want me to adjust anything?"

User: "Change the latency panel from a graph to a table on my API dashboard"

Agent:

1. Resolves "API Monitoring" through a filtered signoz_list_dashboards, then calls signoz_get_dashboard with its id.
2. Finds the panel titled "Request Latency"; if multiple panels could match, confirms with user: "I found 'Request Latency'. Convert that one to a table?"
3. Changes the plugin kind to signoz/TablePanel and the query kind to scalar, matches the table shape in widgets-examples, and keeps the query intact.
4. Dry-runs the table execution shape because panel type affects request shape.
5. Calls signoz_patch_dashboard with replace ops on that panel's plugin and query kind.
6. Reports: "Changed 'Request Latency' from a graph to a table. Want me to adjust column widths or add column units?"

User: "Remove the CPU panel and rename the dashboard to 'Service Health'"

Agent:

1. Fetches the dashboard via signoz_get_dashboard.
2. Finds the "CPU Usage" panel. Confirms: "I'll remove the 'CPU Usage' panel and rename the dashboard to 'Service Health'. Proceed?" (Removal is destructive; always confirm.)
3. User confirms.
4. Removes the panel entry and its grid item. Leaves all other panel positions unchanged (the frontend grid closes gaps automatically). Renames via /spec/display/name, never the immutable top-level name.
5. Calls signoz_patch_dashboard with all three ops in one array.
6. Reports: "Removed the 'CPU Usage' panel and renamed the dashboard to 'Service Health'. Anything else to adjust?"