This code path is only activated when the user does not have a valid
configured tool.  Add a message to guide new users towards configuring a
default tool.

Signed-off-by: David Aguilar <>
--- | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ b/
index 9a5aae9..cf52423 100644
--- a/
+++ b/
@@ -240,7 +240,14 @@ show_tool_help () {
 guess_merge_tool () {
-       echo >&2 "merge tool candidates: $tools"
+       msg="\
+This message is displayed because '$TOOL_MODE.tool' is not configured.
+See 'git ${TOOL_MODE}tool --tool-help' or 'git help config' for more details.
+'git ${TOOL_MODE}tool' will now attempt to use one of the following tools:
+       printf "$msg" >&2
        # Loop over each candidate and stop when a valid merge tool is found.
        for i in $tools

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